Efficient charge generation by relaxed charge-transfer states at organic interfaces

被引：2

作者：

Vandewal K. ^{[1
]}

Albrecht S. ^{[2
]}

Hoke E.T. ^{[1
]}

Graham K.R. ^{[1
,3
]}

Widmer J. ^{[4
]}

Douglas J.D. ^{[5
]}

Schubert M. ^{[2
]}

Mateker W.R. ^{[1
]}

Bloking J.T. ^{[1
]}

Burkhard G.F. ^{[1
]}

Sellinger A. ^{[1
,6
]}

Fréchet J.M.J. ^{[3
,5
]}

Amassian A. ^{[3
]}

Riede M.K. ^{[4
,7
]}

McGehee M.D. ^{[1
]}

Neher D. ^{[2
]}

Salleo A. ^{[1
]}

机构：

[1] Department of Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford

[2] Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25

[3] King Abdullah University of Science and Technology (KAUST)

[4] Institut für Angewandte Photophysik TU Dresden, George-Bähr-Strasse 1, 01062, Dresden

[5] Department of Chemistry, University of California, 727 Latimer Hall, Berkeley

[6] Department of Chemistry and Geochemistry, Colorado School of Mines, Golden

[7] Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road

来源：

Nat. Mater. | / 1卷 / 63-68期

关键词：

33;

D O I：

10.1038/nmat3807

中图分类号：

学科分类号：

摘要：

Interfaces between organic electron-donating (D) and electron-accepting (A) materials have the ability to generate charge carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowest energy emissive interfacial charge-transfer state (CT1) in the charge generation process. We measure the quantum yield and the electric field dependence of charge generation on excitation of the charge-transfer (CT) state manifold via weakly allowed, low-energy optical transitions. For a wide range of photovoltaic devices based on polymer:fullerene, small-molecule:C60 and polymer:polymer blends, our study reveals that the internal quantum efficiency (IQE) is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited. The best materials systems show an IQE higher than 90% without the need for excess electronic or vibrational energy. © 2014 Macmillan Publishers Limited.

引用

页码：63 / 68

页数：5

共 50 条

[1] Efficient charge generation by relaxed charge-transfer states at organic interfaces
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Albrecht, Steve
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Graham, Kenneth R.
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Schubert, Marcel
Mateker, William R.
Bloking, Jason T.
Burkhard, George F.
Sellinger, Alan
Frechet, Jean M. J.
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