Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots

Nature Communications
Jianbo GaoVictor I Klimov

Abstract

In carrier multiplication, the absorption of a single photon results in two or more electron-hole pairs. Quantum dots are promising materials for implementing carrier multiplication principles in real-life technologies. So far, however, most of research in this area has focused on optical studies of solution samples with yet to be proven relevance to practical devices. Here we report ultrafast electro-optical studies of device-grade films of electronically coupled quantum dots that allow us to observe multiplication directly in the photocurrent. Our studies help rationalize previous results from both optical spectroscopy and steady-state photocurrent measurements and also provide new insights into effects of electric field and ligand treatments on multiexciton yields. Importantly, we demonstrate that using appropriate chemical treatments of the films, extra charges produced by carrier multiplication can be extracted from the quantum dots before they are lost to Auger recombination and hence can contribute to photocurrent of practical devices.

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Citations

Jun 28, 2016·Nano Letters·Dmitry A KuzminVasily V Temnov
Sep 30, 2016·Chemical Reviews·Jeffrey M PietrygaVictor I Klimov
Jun 10, 2017·Nano Letters·Clément LivacheEmmanuel Lhuillier
Nov 5, 2016·Physical Chemistry Chemical Physics : PCCP·Manoj KumarCesare Soci
Nov 23, 2019·Nanoscale·Hadi Tavakoli DastjerdiMohammad Mahdi Tavakoli
Feb 17, 2021·Nano Letters·Jun Suk KimYoung Hee Lee
Jan 12, 2021·Chemical Reviews·Christopher Melnychuk, Philippe Guyot-Sionnest
Mar 2, 2021·Chemical Reviews·Charlie GrébovalEmmanuel Lhuillier
Jun 15, 2021·Chemical Science·Wenbi Shcherbakov-Wu, William A Tisdale
Jul 13, 2021·Nanoscale·Ivan Marri, Stefano Ossicini
Jun 9, 2020·Journal of the American Chemical Society·Tong CaiOu Chen
Mar 27, 2018·ACS Applied Materials & Interfaces·Clément LivacheEmmanuel Lhuillier
Jul 2, 2019·ACS Applied Materials & Interfaces·Hadi Tavakoli DastjerdiMohammad Mahdi Tavakoli
Nov 2, 2021·Nano Letters·Mengxia LiuAkshay Rao

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