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Modelling dynamical 3D electron diffraction intensities. I. A scattering cluster algorithm (2024)
Journal Article
Mendis, B. (2024). Modelling dynamical 3D electron diffraction intensities. I. A scattering cluster algorithm. Acta Crystallographica Section A: Foundations and Advances, 80(2), 167-177. https://doi.org/10.1107/s2053273323010689

Three‐dimensional electron diffraction (3D‐ED) is a powerful technique for crystallographic characterization of nanometre‐sized crystals that are too small for X‐ray diffraction. For accurate crystal structure refinement, however, it is important tha... Read More about Modelling dynamical 3D electron diffraction intensities. I. A scattering cluster algorithm.

Modelling dynamical 3D electron diffraction intensities. II. The role of inelastic scattering (2024)
Journal Article
Mendis, B. (2024). Modelling dynamical 3D electron diffraction intensities. II. The role of inelastic scattering. Acta Crystallographica Section A: Foundations and Advances, 80(2), 178-188. https://doi.org/10.1107/s2053273323010690

The strong interaction of high‐energy electrons with a crystal results in both dynamical elastic scattering and inelastic events, particularly phonon and plasmon excitation, which have relatively large cross sections. For accurate crystal structure r... Read More about Modelling dynamical 3D electron diffraction intensities. II. The role of inelastic scattering.

A simulation study of the role of anisotropic charge transport and grain boundary recombination in thin-film Sb2Se3 photovoltaics (2023)
Journal Article
Lomas-Zapata, R., Prior, A., & Mendis, B. (2023). A simulation study of the role of anisotropic charge transport and grain boundary recombination in thin-film Sb2Se3 photovoltaics. Solar Energy, 264, Article 112054. https://doi.org/10.1016/j.solener.2023.112054

The crystal structure of Sb2Se3, which consists of [0 0 1] oriented ribbons held together by weak van der Waals forces, gives rise to unique absorber layer properties different from other more conventional photovoltaic materials, such as Si or CdTe.... Read More about A simulation study of the role of anisotropic charge transport and grain boundary recombination in thin-film Sb2Se3 photovoltaics.

Quantifying Molecular Disorder in Tri-Isopropyl Silane (TIPS) Pentacene Using Variable Coherence Transmission Electron Microscopy (2023)
Journal Article
Alanazi, F., Eggeman, A. S., Stavrou, K., Danos, A., Monkman, A. P., & Mendis, B. G. (2023). Quantifying Molecular Disorder in Tri-Isopropyl Silane (TIPS) Pentacene Using Variable Coherence Transmission Electron Microscopy. Journal of Physical Chemistry Letters, 14(36), 8183-8190. https://doi.org/10.1021/acs.jpclett.3c01344

Structural disorder in molecular crystals is a fundamental limitation for achieving high charge carrier mobilities. Quantifying and uncovering the mechanistic origins of disorder are, however, extremely challenging. Here we use variable coherence tra... Read More about Quantifying Molecular Disorder in Tri-Isopropyl Silane (TIPS) Pentacene Using Variable Coherence Transmission Electron Microscopy.

Twist-induced interlayer charge buildup in a WS2 bilayer revealed by electron Compton scattering and density functional theory (2023)
Journal Article
Talmantaite, A., Xie, Y., Cohen, A., Mohapatra, P., Ismach, A., Mizoguchi, T., …Mendis, B. (2023). Twist-induced interlayer charge buildup in a WS2 bilayer revealed by electron Compton scattering and density functional theory. Physical Review B, 107(23), Article 235424. https://doi.org/10.1103/physrevb.107.235424

Exotic properties emerge from the electronic structure of few-layer transition-metal dichalcogenides (TMDs), such as direct band gaps in monolayers and moiré excitons in twisted bilayers, which are exploited in modern optoelectronic devices and twist... Read More about Twist-induced interlayer charge buildup in a WS2 bilayer revealed by electron Compton scattering and density functional theory.

A “Phase Scrambling” Algorithm for Parallel Multislice Simulation of Multiple Phonon and Plasmon Scattering Configurations (2023)
Journal Article
Mendis, B. G. (2023). A “Phase Scrambling” Algorithm for Parallel Multislice Simulation of Multiple Phonon and Plasmon Scattering Configurations. Microscopy and Microanalysis, 29(3), 1111-1123. https://doi.org/10.1093/micmic/ozad052

Multislice simulations of 4D scanning transmission electron microscopy (4D STEM) data are computationally demanding due to the large number of STEM probe positions that must be calculated. For accurate analysis, inelastic scattering from phonons and... Read More about A “Phase Scrambling” Algorithm for Parallel Multislice Simulation of Multiple Phonon and Plasmon Scattering Configurations.

Coherent electron Compton scattering and the non-diagonal electron momentum density of solids (2022)
Journal Article
Mendis, B. (2023). Coherent electron Compton scattering and the non-diagonal electron momentum density of solids. Ultramicroscopy, 245, https://doi.org/10.1016/j.ultramic.2022.113664

Experimental techniques that probe the electronic structure of crystalline solids are vital for exploring novel condensed matter phenomena. In coherent Compton scattering the Compton signal due to interference of an incident and Bragg diffracted beam... Read More about Coherent electron Compton scattering and the non-diagonal electron momentum density of solids.

Structure and electronic properties of domain walls and stacking fault defects in prospective photoferroic materials bournonite and enargite (2022)
Journal Article
Rigby, O., Richards-Hlabangana, T., Ramasse, Q., MacLaren, I., Lomas-Zapata, R., Rumsey, M., …Mendis, B. (2022). Structure and electronic properties of domain walls and stacking fault defects in prospective photoferroic materials bournonite and enargite. Journal of Applied Physics, 132(18), Article 185001. https://doi.org/10.1063/5.0095091

Bournonite (CuPbSbS3) and enargite (Cu3AsS4) have recently been used as absorber layers in thin-film photovoltaic devices due to their ideal bandgap and ferroelectric properties. An understanding of the ferroelectric domain structure in these materia... Read More about Structure and electronic properties of domain walls and stacking fault defects in prospective photoferroic materials bournonite and enargite.

Background subtraction in electron Compton spectroscopy (2022)
Journal Article
Mendis, B. (2022). Background subtraction in electron Compton spectroscopy. Micron, 163, Article 103363. https://doi.org/10.1016/j.micron.2022.103363

Compton scattering in electron energy loss spectroscopy (EELS) is used to quantify the momentum distribution of occupied electronic states in a solid. The Compton signal is a broad feature with a width of several hundred eV. Furthermore, the weak int... Read More about Background subtraction in electron Compton spectroscopy.

Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts (2022)
Journal Article
Mendis, B. G., & Talmantaite, A. (2022). Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts. Microscopy and Microanalysis, https://doi.org/10.1017/s1431927622012223

The Compton signal in electron energy loss spectroscopy (EELS) is used to determine the projected electron momentum density of states for the solid. A frequent limitation however is the strong dynamical scattering of the incident electron beam within... Read More about Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts.

Quantum theory of magnon excitation by high energy electron beams (2022)
Journal Article
Mendis, B. (2022). Quantum theory of magnon excitation by high energy electron beams. Ultramicroscopy, 239, Article 113548. https://doi.org/10.1016/j.ultramic.2022.113548

The role of magnon inelastic scattering in high energy electron diffraction of spin unpolarised electron beams, including vortex beams, is investigated theoretically for a Heisenberg ferromagnet. The interaction is between the atomic magnetic dipoles... Read More about Quantum theory of magnon excitation by high energy electron beams.

Selenium passivates grain boundaries in alloyed CdTe solar cells (2022)
Journal Article
Fiducia, T., Howkins, A., Abbas, A., Mendis, B., Munshi, A., Barth, K., …Walls, J. (2022). Selenium passivates grain boundaries in alloyed CdTe solar cells. Solar Energy Materials and Solar Cells, 238, Article 111595. https://doi.org/10.1016/j.solmat.2022.111595

Cadmium telluride (CdTe) solar cells have achieved efficiencies of over 22%, despite having absorber layer grain sizes less than 10 μm and hence a very high density of grain boundaries. Recent research has shown that this is possible because of parti... Read More about Selenium passivates grain boundaries in alloyed CdTe solar cells.

Differing Impacts of Blended Fullerene Acceptors on the Performance of Ternary Organic Solar Cells (2021)
Journal Article
Palacios-Gómez, D. A., Huerta Flores, A. M., MacKenzie, R. C., Pearson, C., Alanazi, F., Mendis, B. G., & Groves, C. (2021). Differing Impacts of Blended Fullerene Acceptors on the Performance of Ternary Organic Solar Cells. ACS Applied Energy Materials, 4(10), 10867-10876. https://doi.org/10.1021/acsaem.1c01833

Organic photovoltaic (OPV) devices offer the ability to tune the electronic and optical properties of the active layer by selection of a wide range of molecules; however, their power conversion efficiencies currently lag other competing photovoltaic... Read More about Differing Impacts of Blended Fullerene Acceptors on the Performance of Ternary Organic Solar Cells.

A semi-classical theory of magnetic inelastic scattering in transmission electron energy loss spectroscopy (2021)
Journal Article
Mendis, B. (2021). A semi-classical theory of magnetic inelastic scattering in transmission electron energy loss spectroscopy. Ultramicroscopy, 230, Article 113390. https://doi.org/10.1016/j.ultramic.2021.113390

The feasibility of detecting magnetic excitations using monochromated electron energy loss spectroscopy in the transmission electron microscope is examined. Inelastic scattering cross-sections are derived using a semi-classical electrodynamic model,... Read More about A semi-classical theory of magnetic inelastic scattering in transmission electron energy loss spectroscopy.

Surface Core Hole Electron Energy-Loss Fine Structure in MgO: Experiment and Theory (2021)
Journal Article
Mendis, B. (2021). Surface Core Hole Electron Energy-Loss Fine Structure in MgO: Experiment and Theory. Microscopy and Microanalysis, 27(6), 1316-1327. https://doi.org/10.1017/s1431927621012691

Core holes are an important contributing factor to the core-loss fine structure in electron energy-loss spectroscopy (EELS). While there has been much work on bulk materials, less is known about core hole screening in more complex dielectric environm... Read More about Surface Core Hole Electron Energy-Loss Fine Structure in MgO: Experiment and Theory.

Removal of core hole distortion from ionization edges in electron energy loss spectroscopy (2021)
Journal Article
Mendis, B., & Ramasse, Q. (2021). Removal of core hole distortion from ionization edges in electron energy loss spectroscopy. Physical Review B, 103(20), Article 205102. https://doi.org/10.1103/physrevb.103.205102

The near-edge fine structure in electron energy loss spectra is used to probe the electronic bonding environment of materials at high spatial resolution. Often, however, deviations from the ground state electronic properties are observed, due to the... Read More about Removal of core hole distortion from ionization edges in electron energy loss spectroscopy.

Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging (2020)
Journal Article
Mendis, B. G., Barthel, J., Findlay, S. D., & Allen, L. J. (2020). Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging. Microscopy and Microanalysis, 26(6), 1147-1157. https://doi.org/10.1017/s1431927620024605

Electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) are used to extract crystallographic information from bulk samples, such as their crystal structure and orientation as well as the presence of any dislocation and... Read More about Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging.

Microscopic Analysis of Interdiffusion and Void Formation in CdTe(1–x)Sex and CdTe Layers (2020)
Journal Article
Baines, T., Bowen, L., Mendis, B. G., & Major, J. D. (2020). Microscopic Analysis of Interdiffusion and Void Formation in CdTe(1–x)Sex and CdTe Layers. ACS Applied Materials and Interfaces, 12(34), 38070-38075. https://doi.org/10.1021/acsami.0c09381

The use of CdSe layers has recently emerged as a route to improving CdTe photovoltaics through the formation of a CdTe(1–x)Sex (CST) phase. However, the extent of the Se diffusion and the influence it has on the CdTe grain structure has not been wide... Read More about Microscopic Analysis of Interdiffusion and Void Formation in CdTe(1–x)Sex and CdTe Layers.

Theory underpinning multislice simulations with plasmon energy losses (2020)
Journal Article
Mendis, B. (2020). Theory underpinning multislice simulations with plasmon energy losses. Microscopy, 69(3), 173-175. https://doi.org/10.1093/jmicro/dfaa003

The theoretical conditions for small-angle inelastic scattering where the incident electron can effectively be treated as a particle moving in a uniform potential is examined. The motivation for this work is the recent development of a multislice met... Read More about Theory underpinning multislice simulations with plasmon energy losses.

Angular dependence of fast-electron scattering from materials (2020)
Journal Article
Barthel, J., Cattaneo, M., Mendis, B. G., Findlay, S. D., & Allen, L. J. (2020). Angular dependence of fast-electron scattering from materials. Physical Review B, 101(18), Article 184109. https://doi.org/10.1103/physrevb.101.184109

Angular resolved scanning transmission electron microscopy is an important tool for investigating the properties of materials. However, several recent studies have observed appreciable discrepancies in the angular scattering distribution between expe... Read More about Angular dependence of fast-electron scattering from materials.

Evidence for Self-healing Benign Grain Boundaries and a Highly Defective Sb2Se3–CdS Interfacial Layer in Sb2Se3 Thin-Film Photovoltaics (2020)
Journal Article
Williams, R. E., Ramasse, Q. M., McKenna, K. P., Phillips, L. J., Yates, P. J., Hutter, O. S., …Mendis, B. G. (2020). Evidence for Self-healing Benign Grain Boundaries and a Highly Defective Sb2Se3–CdS Interfacial Layer in Sb2Se3 Thin-Film Photovoltaics. ACS Applied Materials and Interfaces, 12(19), 21730-21738. https://doi.org/10.1021/acsami.0c03690

The crystal structure of Sb2Se3 gives rise to unique properties that cannot otherwise be achieved with conventional thin-film photovoltaic materials, such as CdTe or Cu(In,Ga)Se2. It has previously been proposed that grain boundaries can be made beni... Read More about Evidence for Self-healing Benign Grain Boundaries and a Highly Defective Sb2Se3–CdS Interfacial Layer in Sb2Se3 Thin-Film Photovoltaics.

Electron Compton scattering and the measurement of electron momentum distributions in solids (2020)
Journal Article
Talmantaite, A., Hunt, M., & Mendis, B. (2020). Electron Compton scattering and the measurement of electron momentum distributions in solids. Journal of Microscopy, 279(3), 185-188. https://doi.org/10.1111/jmi.12854

Electron Compton scattering is a technique that gives information on the electron momentum density of states and is used to characterize the ground state electronic structure in solids. Extracting the momentum density of states requires us to assume... Read More about Electron Compton scattering and the measurement of electron momentum distributions in solids.

An inelastic multislice simulation method incorporating plasmon energy losses (2019)
Journal Article
Mendis, B. (2019). An inelastic multislice simulation method incorporating plasmon energy losses. Ultramicroscopy, 206, Article 112816. https://doi.org/10.1016/j.ultramic.2019.112816

Quantitative electron microscopy requires accurate simulation methods that take into account both elastic and inelastic scattering of the high energy electrons within the specimen. Here a method to combine plasmon excitations, the dominant energy los... Read More about An inelastic multislice simulation method incorporating plasmon energy losses.

Planck's generalised radiation law and its implications for cathodoluminescence spectra (2019)
Journal Article
Mendis, B. (2019). Planck's generalised radiation law and its implications for cathodoluminescence spectra. Ultramicroscopy, 204, 73-80. https://doi.org/10.1016/j.ultramic.2019.05.007

Cathodoluminescence (CL) is an important analytical technique for probing the optical properties of materials at high spatial resolution. Interpretation of CL spectra is however complicated by the fact that the spectrum depends on the carrier injecti... Read More about Planck's generalised radiation law and its implications for cathodoluminescence spectra.

Understanding the role of selenium in defect passivation for highly efficient selenium-alloyed cadmium telluride solar cells (2019)
Journal Article
Fiducia, T. A., Mendis, B. G., Li, K., Grovenor, C. R., Munshi, A. H., Barth, K., …Walls, J. M. (2019). Understanding the role of selenium in defect passivation for highly efficient selenium-alloyed cadmium telluride solar cells. Nature Energy, 4, 504-511. https://doi.org/10.1038/s41560-019-0389-z

Electricity produced by cadmium telluride (CdTe) photovoltaic modules is the lowest-cost electricity in the solar industry, and now undercuts fossil fuel-based sources in many regions of the world. This is due to recent efficiency gains brought about... Read More about Understanding the role of selenium in defect passivation for highly efficient selenium-alloyed cadmium telluride solar cells.

Fully depleted emitter layers: a novel method to improve band alignment in thin-film solar cells (2019)
Journal Article
Mendis, B. (2019). Fully depleted emitter layers: a novel method to improve band alignment in thin-film solar cells. Semiconductor Science and Technology, 34(5), Article 055008. https://doi.org/10.1088/1361-6641/ab0c2b

The interface between the emitter and absorber layers in a thin-film solar cell must satisfy two important criteria, namely a small lattice mismatch and electron barrier height. It is shown that the barrier height is lowered when the emitter is fully... Read More about Fully depleted emitter layers: a novel method to improve band alignment in thin-film solar cells.

Optical Properties and Dielectric Functions of Grain Boundaries and Interfaces in CdTe Thin-Film Solar Cells (2019)
Journal Article
Mendis, B. G., Ramasse, Q. M., Shalvey, T., Major, J. D., & Durose, K. (2019). Optical Properties and Dielectric Functions of Grain Boundaries and Interfaces in CdTe Thin-Film Solar Cells. ACS Applied Energy Materials, 2(2), 1419-1427. https://doi.org/10.1021/acsaem.8b01995

CdTe thin-film solar cells have complex microstructures, such as grain boundaries within the absorber layer, as well as CdS window, and Au back contact interfaces, where the local structure and chemistry undergo significant changes. The optical prope... Read More about Optical Properties and Dielectric Functions of Grain Boundaries and Interfaces in CdTe Thin-Film Solar Cells.

Novel synthesis and properties of hydrogen-free detonation nanodiamond (2018)
Journal Article
Batsanov, S. S., Osavchuk, A. N., Naumov, S. P., Gavrilkin, S. M., Leskov, A. S., Mendis, B. G., …Batsanov, A. S. (2018). Novel synthesis and properties of hydrogen-free detonation nanodiamond. Materials Chemistry and Physics: Including Materials Science Communications, 216, 120-129. https://doi.org/10.1016/j.matchemphys.2018.05.072

Practically hydrogen-free nanodiamond (HFND), a prospective neutron-optical material, was prepared (in up to 3% yield) by detonating pure or graphite-doped RDX in an ice shell and comprehensively characterized by elemental analysis, X-ray diffraction... Read More about Novel synthesis and properties of hydrogen-free detonation nanodiamond.

Crystal structure and anti-site boundary defect characterisation of Cu2ZnSnSe4 (2017)
Journal Article
Mendis, B., McKenna, K., Gurieva, G., Rumsey, M., & Schorr, S. (2018). Crystal structure and anti-site boundary defect characterisation of Cu2ZnSnSe4. Journal of Materials Chemistry A: materials for energy and sustainability, 6(1), 189-197. https://doi.org/10.1039/c7ta08263k

The crystal structure identification of the photovoltaic material Cu2ZnSnSe4 (CZTSe) is challenging due to the distinguishing feature between the two polymorphs, kesterite and stannite, being the arrangement of Cu and Zn ions. Here an energy dispersi... Read More about Crystal structure and anti-site boundary defect characterisation of Cu2ZnSnSe4.

Nanometre-scale optical property fluctuations in Cu2ZnSnS4 revealed by low temperature cathodoluminescence (2017)
Journal Article
Mendis, B., Taylor, A., Guennou, M., Berg, D., Arasimowicz, M., Ahmed, S., …Dale, P. (2018). Nanometre-scale optical property fluctuations in Cu2ZnSnS4 revealed by low temperature cathodoluminescence. Solar Energy Materials and Solar Cells, 174, 65-76. https://doi.org/10.1016/j.solmat.2017.08.028

Band tailing is a major contributing factor to the large open circuit voltage (Voc) deficit that is currently limiting Cu2ZnSnS4 (CZTS) photovoltaic devices. It occurs in highly doped, highly compensated semiconductors and gives rise to a non-uniform... Read More about Nanometre-scale optical property fluctuations in Cu2ZnSnS4 revealed by low temperature cathodoluminescence.

The role of transition radiation in cathodoluminescence imaging and spectroscopy of thin-foils (2016)
Journal Article
Mendis, B., Howkins, A., Stowe, D., Major, J., & Durose, K. (2016). The role of transition radiation in cathodoluminescence imaging and spectroscopy of thin-foils. Ultramicroscopy, 167, 31-42. https://doi.org/10.1016/j.ultramic.2016.05.002

There is renewed interest in cathodoluminescence (CL) in the transmission electron microscope, since it can be combined with low energy loss spectroscopy measurements and can also be used to probe defects, such as grain boundaries and dislocations, a... Read More about The role of transition radiation in cathodoluminescence imaging and spectroscopy of thin-foils.

The effects of junction interdiffusion and misfit dislocations on the efficiency of highly mismatched heterojunction photovoltaic devices (2016)
Journal Article
Mendis, B., Treharne, R., Lane, D., & Durose, K. (2016). The effects of junction interdiffusion and misfit dislocations on the efficiency of highly mismatched heterojunction photovoltaic devices. Applied Physics Letters, 108(18), Article 183505. https://doi.org/10.1063/1.4948397

A general modelling methodology has been developed to evaluate the effects of chemical interdiffusion and misfit dislocations on the performance of heterojunction solar cells made from highly mismatched materials. Results for the exemplar materials s... Read More about The effects of junction interdiffusion and misfit dislocations on the efficiency of highly mismatched heterojunction photovoltaic devices.

Understanding quaternary compound Cu2ZnSnSe4 synthesis by microscopic scale analyses at an identical location (2016)
Journal Article
Crossay, A., Colombara, D., Melchiorre, M., Guennou, M., Mendis, B., & Dale, P. (2016). Understanding quaternary compound Cu2ZnSnSe4 synthesis by microscopic scale analyses at an identical location. Journal of Materials Chemistry C Materials for optical and electronic devices, 4(21), 4626-4629. https://doi.org/10.1039/c6tc01114d

The synthesis of multinary compound films from layered precursors is only partially understood. Identical location microscopy resolves the multi-step synthesis of Cu2ZnSnSe4 from metallic stacks on the micron-scale. Large scale metal alloying and the... Read More about Understanding quaternary compound Cu2ZnSnSe4 synthesis by microscopic scale analyses at an identical location.

Direct growth of Si nanowires on flexible organic substrates (2016)
Journal Article
Tian (田琳), L., Di Mario, L., Minotti, A., Tiburzi, G., Mendis, B. G., Zeze, D. A., & Martelli, F. (2016). Direct growth of Si nanowires on flexible organic substrates. Nanotechnology, 27(22), Article 225601. https://doi.org/10.1088/0957-4484/27/22/225601

A key characteristic of semiconductor nanowires (NWs) is that they grow on any substrate that can withstand the growth conditions, paving the way for their use in flexible electronics. We report on the direct growth of crystalline silicon nanowires o... Read More about Direct growth of Si nanowires on flexible organic substrates.

Long lifetime hole traps at grain boundaries in CdTe thin-film photovoltaics (2015)
Journal Article
Mendis, B., Gachet, D., Major, J., & Durose, K. (2015). Long lifetime hole traps at grain boundaries in CdTe thin-film photovoltaics. Physical Review Letters, 115(21), Article 218701. https://doi.org/10.1103/physrevlett.115.218701

A novel time-resolved cathodoluminescence method, where a pulsed electron beam is generated via the photoelectric effect, is used to probe individual CdTe grain boundaries. Excitons have a short lifetime (≤100  ps ) within the grains and are rapidly... Read More about Long lifetime hole traps at grain boundaries in CdTe thin-film photovoltaics.

On the electron vortex beam wavefunction within a crystal (2015)
Journal Article
Mendis, B. (2015). On the electron vortex beam wavefunction within a crystal. Ultramicroscopy, 157, 1-11. https://doi.org/10.1016/j.ultramic.2015.05.004

Electron vortex beams are distorted by scattering within a crystal, so that the wavefunction can effectively be decomposed into many vortex components. Using a Bloch wave approach equations are derived for vortex beam decomposition at any given depth... Read More about On the electron vortex beam wavefunction within a crystal.

A comparative study of microstructural stability and sulphur diffusion in CdS/CdTe photovoltaic devices (2015)
Journal Article
Taylor, A., Major, J., Kartopu, G., Lamb, D., Duenow, J., Dhere, R., …Mendis, B. (2015). A comparative study of microstructural stability and sulphur diffusion in CdS/CdTe photovoltaic devices. Solar Energy Materials and Solar Cells, 141, 341-349. https://doi.org/10.1016/j.solmat.2015.06.010

The role of CdCl2 activation in the production of high quality CdTe-based photovoltaic devices remains a subject of much debate. In this study, CdTe-based cells produced in three independent laboratories using different device fabrication technologie... Read More about A comparative study of microstructural stability and sulphur diffusion in CdS/CdTe photovoltaic devices.

Examining Charge Transport Networks in Organic Bulk Heterojunction Photovoltaic Diodes using 1/f Noise Spectroscopy (2015)
Journal Article
Kaku, K., Williams, A., Mendis, B., & Groves, C. (2015). Examining Charge Transport Networks in Organic Bulk Heterojunction Photovoltaic Diodes using 1/f Noise Spectroscopy. Journal of Materials Chemistry C Materials for optical and electronic devices, 3(23), 6077-6085. https://doi.org/10.1039/c5tc00348b

In this article we present 1/f noise spectroscopy measurements relating to charge transport networks in poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) space-charge limited diode (SCLD) and organic photovoltaic (OPV) devices... Read More about Examining Charge Transport Networks in Organic Bulk Heterojunction Photovoltaic Diodes using 1/f Noise Spectroscopy.

Dynamic scattering of electron vortex beams – A Bloch wave analysis (2014)
Journal Article
Mendis, B. (2015). Dynamic scattering of electron vortex beams – A Bloch wave analysis. Ultramicroscopy, 149, 74-85. https://doi.org/10.1016/j.ultramic.2014.11.001

Two important applications of electron vortex beams are in electron magnetic chiral dichroism (EMCD) measurements and nanoparticle manipulation. In both cases orbital angular momentum (〈Lz〉) transfer between the vortex beam and the specimen due to... Read More about Dynamic scattering of electron vortex beams – A Bloch wave analysis.

Plasmon-loss imaging of polymer-methanofullerene bulk heterojunction solar cells (2013)
Journal Article
Mendis, B. G., Bishop, S. J., Groves, C., Szablewski, M., Berlie, A., & Halliday, D. P. (2013). Plasmon-loss imaging of polymer-methanofullerene bulk heterojunction solar cells. Applied Physics Letters, 102(25), Article 253301. https://doi.org/10.1063/1.4812485

The plasmon feature in an electron energy loss spectrum provides unique insight into poly(3-hexylthiophene) (P3HT)-phenyl-C61-butyric acid methyl ester (PCBM) solar cells. Analysis of the intensity, shape, and energy of the plasmon reveals informatio... Read More about Plasmon-loss imaging of polymer-methanofullerene bulk heterojunction solar cells.

Microstructure and point defects in CdTe nanowires for photovoltaic applications (2013)
Journal Article
Williams, B., Halliday, D., Mendis, B., & Durose, K. (2013). Microstructure and point defects in CdTe nanowires for photovoltaic applications. Nanotechnology, 24(13), Article 135703. https://doi.org/10.1088/0957-4484/24/13/135703

Defects in Au-catalysed CdTe nanowires vapour–liquid–solid-grown on polycrystalline underlayers have been critically evaluated. Their low-temperature photoluminescence spectra were dominated by excitonic emission with rarely observed above-gap emissi... Read More about Microstructure and point defects in CdTe nanowires for photovoltaic applications.

Direct observation of Cu,Zn cation disorder in Cu2ZnSnS4 solar cell absorber material using aberration corrected scanning transmission electron microscopy (2012)
Journal Article
Mendis, B., Shannon, M., Goodman, M., Major, J., Claridge, R., Halliday, D., & Durose, K. (2014). Direct observation of Cu,Zn cation disorder in Cu2ZnSnS4 solar cell absorber material using aberration corrected scanning transmission electron microscopy. Progress in Photovoltaics, 22(1), 24-34. https://doi.org/10.1002/pip.2279

Chemical analysis of individual atom columns was carried out to determine the crystal structure and local point defect chemistry of Cu2ZnSnS4. Direct evidence for a nanoscale composition inhomogeneity, in the form of Zn enrichment and Cu depletion, w... Read More about Direct observation of Cu,Zn cation disorder in Cu2ZnSnS4 solar cell absorber material using aberration corrected scanning transmission electron microscopy.

Stable Polymorphs Crystallized Directly under Thermodynamic Control in Three-Dimensional Nanoconfinement: A Generic Methodology (2011)
Journal Article
Nicholson, C., Chen, C., Mendis, B., & Cooper, S. (2011). Stable Polymorphs Crystallized Directly under Thermodynamic Control in Three-Dimensional Nanoconfinement: A Generic Methodology. Crystal Growth and Design, 11(2), 363-366. https://doi.org/10.1021/cg101200f

Thermodynamic control of crystallization has been achieved to produce stable polymorphs directly by using three-dimensional (3D) nanoconfinement in microemulsions. The theoretical basis for thermodynamic control of crystallization using 3D nanoconfin... Read More about Stable Polymorphs Crystallized Directly under Thermodynamic Control in Three-Dimensional Nanoconfinement: A Generic Methodology.

Preparation, Characterization, and Structural Phase Transitions in a New Family of Semiconducting Transition Metal Oxychalcogenides beta-La(2)O(2)MSe(2) (M = Mn, Fe) (2010)
Journal Article
McCabe, E., Free, D., Mendis, B., Higgins, J., & Evans, J. (2010). Preparation, Characterization, and Structural Phase Transitions in a New Family of Semiconducting Transition Metal Oxychalcogenides beta-La(2)O(2)MSe(2) (M = Mn, Fe). Chemistry of Materials, 22(22), 6171-6182. https://doi.org/10.1021/cm1023103

A contactless method for measuring the recombination velocity of an individual grain boundary in thin-film photovoltaics (2010)
Journal Article
Mendis, B., Bowen, L., & Jiang, Q. (2010). A contactless method for measuring the recombination velocity of an individual grain boundary in thin-film photovoltaics. Applied Physics Letters, 97(9), Article 092112. https://doi.org/10.1063/1.3486482

A cathodoluminescence-based, contactless method for extracting the bulk minority carrier diffusion length and reduced recombination velocity of an individual grain boundary is applied to vapor grown CdTe epitaxial films. The measured diffusion length... Read More about A contactless method for measuring the recombination velocity of an individual grain boundary in thin-film photovoltaics.

HREM imaging of screw dislocation core structures in bcc metals (2005)
Book Chapter
Mendis, B., Mishin, Y., Hartley, C., & Hemker, K. (2005). HREM imaging of screw dislocation core structures in bcc metals. In D. C. Martin, D. A. Muller, P. A. Midgley, & E. A. Stach (Eds.), Electron Microscopy of Molecular and Atom-Scale Mechanical Behavior, Chemistry and Structure (73-78). Cambridge University Press

Suzuki segregation to stacking faults in a Cu-Si alloy (2005)
Book Chapter
Mendis, B., Jones, I., & Smallman, R. (2005). Suzuki segregation to stacking faults in a Cu-Si alloy. In D. Martin, D. Muller, P. Midgley, & E. Stach (Eds.), Electron Microscopy of Molecular and Atom-Scale Mechanical Behavior, Chemistry and Structure (137-142). Materials Research Society