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

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. We report ultra-fast 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.

Authors:
 [1];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Berkeley, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)
Sponsoring Org.:
USDOE
OSTI Identifier:
1224438
Report Number(s):
LA-UR-15-25555
Journal ID: ISSN 2041-1723; ncomms9185
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; physical sciences; nanotechnology; optical physics; materials science

Citation Formats

Gao, Jianbo, Fidler, Andrew F., and Klimov, Victor I. Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots. United States: N. p., 2015. Web. doi:10.1038/ncomms9185.
Gao, Jianbo, Fidler, Andrew F., & Klimov, Victor I. Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots. United States. doi:10.1038/ncomms9185.
Gao, Jianbo, Fidler, Andrew F., and Klimov, Victor I. Tue . "Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots". United States. doi:10.1038/ncomms9185. https://www.osti.gov/servlets/purl/1224438.
@article{osti_1224438,
title = {Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots},
author = {Gao, Jianbo and Fidler, Andrew F. and Klimov, Victor I.},
abstractNote = {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. We report ultra-fast 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.},
doi = {10.1038/ncomms9185},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {2015},
month = {9}
}

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Cited by: 14 works
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