Peak External Photocurrent Quantum Efficiency Exceeding 100% via MEG in a Quantum Dot Solar Cell

被引：1429

作者：

Semonin, Octavi E. ^{[1
,2
]}

Luther, Joseph M. ^{[1
]}

Choi, Sukgeun ^{[1
]}

Chen, Hsiang-Yu ^{[1
]}

Gao, Jianbo ^{[1
,3
]}

Nozik, Arthur J. ^{[1
,4
]}

Beard, Matthew C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA

[4] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

SCIENCE | 2011年 / 334卷 / 6062期

关键词：

MULTIPLE EXCITON GENERATION; CARRIER-MULTIPLICATION; SEMICONDUCTOR NANOCRYSTALS; PBSE; FILMS; PHOTODIODES; PROSPECTS;

D O I：

10.1126/science.1209845

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：1530 / 1533

页数：4

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