High efficiency organic multilayer photodetectors based on singlet exciton fission

被引：177

作者：

Lee, J. ^{[1
]}

Jadhav, P. ^{[1
]}

Baldo, M. A. ^{[1
]}

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 03期

关键词：

excitons; fullerenes; impurity states; multilayers; organic compounds; photoconductivity; photodetectors; photoexcitation; PHOTOINDUCED ELECTRON-TRANSFER; SOLAR-CELLS; HETEROJUNCTIONS; DYNAMICS; STATES; FILMS;

D O I：

10.1063/1.3182787

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We employ an exciton fission process that converts one singlet exciton into two triplet excitons to increase the quantum efficiency of an organic multilayer photodetector beyond 100%. The photodetector incorporates ultrathin alternating donor-acceptor layers of pentacene and C(60), respectively. By comparing the quantum efficiency after separate pentacene and C(60) photoexcitation we find that singlet exciton fission in pentacene enhances the quantum efficiency by (45 +/- 7)%. In quantitative agreement with this result, we also observe that the photocurrent generated from pentacene excitons is decreased by (2.7 +/- 0.2)% under an applied magnetic field of H=0.4 T, while the C(60) photocurrent is relatively unchanged.

引用

页数：3

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