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Nano Lett. 2019 Aug 14;19(8):5489-5495. doi: 10.1021/acs.nanolett.9b02009. Epub 2019 Jul 31.

Elongated Lifetime and Enhanced Flux of Hot Electrons on a Perovskite Plasmonic Nanodiode.

Park Y1,2, Choi J1,2,3, Lee C2,4, Cho AN5, Cho DW6, Park NG5, Ihee H1,2,3, Park JY1,2,4.

Author information

1
Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701 , Republic of Korea.
2
Center for Nanomaterials and Chemical Reactions , Institute for Basic Science (IBS) , Daejeon 305-701 , Republic of Korea.
3
KI for the BioCentury , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701 , Republic of Korea.
4
Graduate School of EEWS , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701 , Republic of Korea.
5
School of Chemical Engineering and Department of Energy Science , Sungkyunkwan University , Suwon 440-746 , Republic of Korea.
6
Department of Advanced Materials Chemistry , Korea University , Sejong Campus , Sejong 30019 , Republic of Korea.

Abstract

A fundamental understanding of hot electron transport is critical for developing efficient hot-carrier-based solar cells. There have been significant efforts to enhance hot electron flux, and it has been found that a key factor affecting the hot electron flux is the lifetime of the hot electrons. Here, we report a combined study of hot electron flux and the lifetime of hot carriers using a perovskite-modified plasmonic nanodiode. We found that perovskite deposition on a plasmonic nanodiode can considerably improve hot electron generation induced by photon absorption. The perovskite plasmonic nanodiode consists of MAPbI3 layers covering a plasmonic-Au/TiO2 Schottky junction that is composed of randomly connected Au nanoislands deposited on a TiO2 layer. The measured incident photon-to-electron conversion efficiency and the short-circuit photocurrent show a significantly improved solar-to-electrical conversion performance of this nanodiode. Such an improvement is ascribed to the improved hot electron flux in MAPbI3 caused by effective light absorption from near-field enhancement of plasmonic Au and the efficient capture of hot electrons from Au nanoislands via the formation of a three-dimensional Schottky interface. The relation between the lifetime and flux of hot electrons was confirmed by femtosecond transient absorption spectroscopy that showed considerably longer hot electron lifetimes in MAPbI3 combined with the plasmonic Au structure. These findings can provide a fundamental understanding of hot electron generation and transport in perovskite, which can provide helpful guidance to designing efficient hot carrier photovoltaics.

KEYWORDS:

Schottky nanodiode; hot carrier solar cells; hot electron; inorganic−organic hybrid perovskite; surface plasmon

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