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Optical properties and carrier dynamics in Co-doped ZnO nanorods

Sivan, Aswathi K.; Galán-González, Alejandro; Di Mario, Lorenzo; Tappy, Nicolas; Hernández-Ferrer, Javier; Catone, Daniele; Turchini, Stefano; Benito, Ana M.; Maser, Wolfgang K.; Steinvall, Simon Escobar; Fontcuberta i Morral, Anna; Gallant, Andrew; Zeze, Dagou A.; Atkinson, Del; Martelli, Faustino

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Authors

Aswathi K. Sivan

Alejandro Galán-González

Lorenzo Di Mario

Nicolas Tappy

Javier Hernández-Ferrer

Daniele Catone

Stefano Turchini

Ana M. Benito

Wolfgang K. Maser

Simon Escobar Steinvall

Anna Fontcuberta i Morral

Faustino Martelli



Abstract

The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic% in the growth solution. Optoelectronic behavior was probed using cathodoluminescence, time-resolved luminescence, transient absorbance spectroscopy, and the incident photon-to-current conversion efficiency (IPCE). Analysis indicates the crucial role of surface defects in determining the electronic behavior. Significantly, Co-doping extends the light absorption of the nanorods into the visible region, increases the surface defects, and shortens the non-radiative lifetimes, while leaving the radiative lifetime constant. Furthermore, for 1 atomic% Co-doping the IPCE of the ZnO nanorods is enhanced. These results demonstrate that doping can controllably tune the functional electronic properties of ZnO nanorods for applications.

Journal Article Type Article
Acceptance Date Nov 9, 2020
Online Publication Date Nov 10, 2020
Publication Date Jan 7, 2021
Deposit Date Jun 15, 2021
Publicly Available Date Jun 15, 2021
Journal Nanoscale Advances
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 3
Issue 1
Pages 214-222
DOI https://doi.org/10.1039/d0na00693a
Public URL https://durham-repository.worktribe.com/output/1274024

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