External Quantum Efficiency Above 100% in a Singlet-Exciton-Fission-Based Organic Photovoltaic Cell

被引：773

作者：

Congreve, Daniel N. ^{[1
]}

Lee, Jiye ^{[1
]}

Thompson, Nicholas J. ^{[1
]}

Hontz, Eric ^{[1
]}

Yost, Shane R. ^{[1
]}

Reusswig, Philip D. ^{[1
]}

Bahlke, Matthias E. ^{[1
]}

Reineke, Sebastian ^{[1
]}

Van Voorhis, Troy ^{[1
]}

Baldo, Marc A. ^{[1
]}

机构：

[1] MIT, Energy Frontier Res Ctr Exciton, Cambridge, MA 02139 USA

来源：

SCIENCE | 2013年 / 340卷 / 6130期

基金：

美国国家科学基金会;

关键词：

ELECTRONIC-STRUCTURE; ENERGY; ANNIHILATION; DYNAMICS;

D O I：

10.1126/science.1232994

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：

Singlet exciton fission transforms a molecular singlet excited state into two triplet states, each with half the energy of the original singlet. In solar cells, it could potentially double the photocurrent from high-energy photons. We demonstrate organic solar cells that exploit singlet exciton fission in pentacene to generate more than one electron per incident photon in a portion of the visible spectrum. Using a fullerene acceptor, a poly(3-hexylthiophene) exciton confinement layer, and a conventional optical trapping scheme, we show a peak external quantum efficiency of (109 +/- 1)% at wavelength lambda = 670 nanometers for a 15-nanometer-thick pentacene film. The corresponding internal quantum efficiency is (160 +/- 10)%. Analysis of the magnetic field effect on photocurrent suggests that the triplet yield approaches 200% for pentacene films thicker than 5 nanometers.

引用

页码：334 / 337

页数：4

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