Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure

Abstract Schottky barrier controls the transfer of hot carriers between contacted metal and semiconductor, and decides the performance of plasmonic metal–semiconductor devices in many applications. It is immensely valuable to actively tune the Schottky barrier. In this work, electrical tuning of Sch...

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Autores principales:	Zhiguang Sun, Yurui Fang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fcb97fc8c3174b19b71ef37a8457c7bb
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spelling	oai:doaj.org-article:fcb97fc8c3174b19b71ef37a8457c7bb2021-12-02T14:12:46ZElectrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure10.1038/s41598-020-79746-52045-2322https://doaj.org/article/fcb97fc8c3174b19b71ef37a8457c7bb2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79746-5https://doaj.org/toc/2045-2322Abstract Schottky barrier controls the transfer of hot carriers between contacted metal and semiconductor, and decides the performance of plasmonic metal–semiconductor devices in many applications. It is immensely valuable to actively tune the Schottky barrier. In this work, electrical tuning of Schottky barrier in an Au-nanodisk/TiO2-film structure was demonstrated using a simple three-electrode electrochemical cell. Photocurrents excited at different wavelength significantly increase as the applied bias voltage increases. Analyzing and fitting of experimental results indicate that the photocurrent is mainly affected by the bias tuning position of Schottky barrier maximum, which shifts to metal–semiconductor interface as applied voltage increases, and enhances the collection efficiency of the barrier for plasmonic hot electrons. The conduction band curvature of 0.13 eV was simultaneously obtained from the fitting. This work provides a new strategy for facile tuning of Schottky barrier and hot-electron transfer across the barrier.Zhiguang SunYurui FangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhiguang Sun Yurui Fang Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
description	Abstract Schottky barrier controls the transfer of hot carriers between contacted metal and semiconductor, and decides the performance of plasmonic metal–semiconductor devices in many applications. It is immensely valuable to actively tune the Schottky barrier. In this work, electrical tuning of Schottky barrier in an Au-nanodisk/TiO2-film structure was demonstrated using a simple three-electrode electrochemical cell. Photocurrents excited at different wavelength significantly increase as the applied bias voltage increases. Analyzing and fitting of experimental results indicate that the photocurrent is mainly affected by the bias tuning position of Schottky barrier maximum, which shifts to metal–semiconductor interface as applied voltage increases, and enhances the collection efficiency of the barrier for plasmonic hot electrons. The conduction band curvature of 0.13 eV was simultaneously obtained from the fitting. This work provides a new strategy for facile tuning of Schottky barrier and hot-electron transfer across the barrier.
format	article
author	Zhiguang Sun Yurui Fang
author_facet	Zhiguang Sun Yurui Fang
author_sort	Zhiguang Sun
title	Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
title_short	Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
title_full	Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
title_fullStr	Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
title_full_unstemmed	Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure
title_sort	electrical tuning effect for schottky barrier and hot-electron harvest in a plasmonic au/tio2 nanostructure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fcb97fc8c3174b19b71ef37a8457c7bb
work_keys_str_mv	AT zhiguangsun electricaltuningeffectforschottkybarrierandhotelectronharvestinaplasmonicautio2nanostructure AT yuruifang electricaltuningeffectforschottkybarrierandhotelectronharvestinaplasmonicautio2nanostructure
_version_	1718391761936580608

Electrical tuning effect for Schottky barrier and hot-electron harvest in a plasmonic Au/TiO2 nanostructure

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