Open Access
Science, volume 334, issue 6062, pages 1530-1533
Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell
Octavi E Semonin
1, 2
,
Joseph M. Luther
1
,
Sukgeun Choi
1
,
Hsiang-yu Chen
1
,
Jianbo Gao
1, 3
,
Arthur J. Nozik
1, 4
,
Matthew C Beard
1
3
Department of Physics and Astronomy, University of Toledo, MS 111, Toledo, OH 43606, USA.
|
Publication type: Journal Article
Publication date: 2011-12-16
Multidisciplinary
Abstract
An experimental solar cell productively uses an extra fraction of high-energy light typically lost as heat. Multiple exciton generation (MEG) is a process that can occur in semiconductor nanocrystals, or quantum dots (QDs), whereby absorption of a photon bearing at least twice the bandgap energy produces two or more electron-hole pairs. Here, we report on photocurrent enhancement arising from MEG in lead selenide (PbSe) QD-based solar cells, as manifested by an external quantum efficiency (the spectrally resolved ratio of collected charge carriers to incident photons) that peaked at 114 ± 1% in the best device measured. The associated internal quantum efficiency (corrected for reflection and absorption losses) was 130%. We compare our results with transient absorption measurements of MEG in isolated PbSe QDs and find reasonable agreement. Our findings demonstrate that MEG charge carriers can be collected in suitably designed QD solar cells, providing ample incentive to better understand MEG within isolated and coupled QDs as a research path to enhancing the efficiency of solar light harvesting technologies.
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Semonin O. E. et al. Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell // Science. 2011. Vol. 334. No. 6062. pp. 1530-1533.
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Semonin O. E., Luther J. M., Choi S., Chen H., Gao J., Nozik A. J., Beard M. C. Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell // Science. 2011. Vol. 334. No. 6062. pp. 1530-1533.
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RIS
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TY - JOUR
DO - 10.1126/science.1209845
UR - https://doi.org/10.1126/science.1209845
TI - Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell
T2 - Science
AU - Semonin, Octavi E
AU - Luther, Joseph M.
AU - Choi, Sukgeun
AU - Chen, Hsiang-yu
AU - Gao, Jianbo
AU - Nozik, Arthur J.
AU - Beard, Matthew C
PY - 2011
DA - 2011/12/16
PB - American Association for the Advancement of Science (AAAS)
SP - 1530-1533
IS - 6062
VL - 334
SN - 0036-8075
SN - 1095-9203
ER -
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BibTex (up to 50 authors)
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@article{2011_Semonin,
author = {Octavi E Semonin and Joseph M. Luther and Sukgeun Choi and Hsiang-yu Chen and Jianbo Gao and Arthur J. Nozik and Matthew C Beard},
title = {Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell},
journal = {Science},
year = {2011},
volume = {334},
publisher = {American Association for the Advancement of Science (AAAS)},
month = {dec},
url = {https://doi.org/10.1126/science.1209845},
number = {6062},
pages = {1530--1533},
doi = {10.1126/science.1209845}
}
Cite this
MLA
Copy
Semonin, Octavi E., et al. “Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell.” Science, vol. 334, no. 6062, Dec. 2011, pp. 1530-1533. https://doi.org/10.1126/science.1209845.