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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 …
Publication date: 
7 Jan 2021

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, Andrew Gallant, Dagou A Zeze, Del Atkinson, Faustino Martelli

Biblio References: 
Volume: 3 Issue: 1 Pages: 214-222
Nanoscale Advances