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Polymers 2016, 8(12), 414; doi:10.3390/polym8120414

Intrinsic Delocalization during the Decay of Excitons in Polymeric Solar Cells

1
Department of Physics, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
2
Department of Physics, Fudan University, Shanghai 200433, China
3
Office of the Chancellor and Center for Nanoscience, Departments of Chemistry & Biochemistry and Physics & Astronomy, University of Missouri–St. Louis, St. Louis, MO 63121, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Ping Xu
Received: 27 September 2016 / Revised: 24 November 2016 / Accepted: 24 November 2016 / Published: 30 November 2016
(This article belongs to the Special Issue Conjugated Polymers 2016)
View Full-Text   |   Download PDF [4488 KB, uploaded 30 November 2016]   |  

Abstract

In bulk heterojunction polymer solar cells, external photoexcitation results in localized excitons in the polymer chain. After hot exciton formation and subsequent relaxation, the dipole moment drives the electron to partially transfer to extended orbitals from the original localized ones, leading to self-delocalization. Based on the dynamic fluorescence spectra, the delocalization of excitons is revealed to be an intrinsic property dominated by exciton decay, acting as a bridge for the exciton to diffuse in the polymeric solar cell. The modification of the dipole moment enhances the efficiency of polymer solar cells. View Full-Text
Keywords: delocalization; excitons; polymeric solar cells; dipole moment delocalization; excitons; polymeric solar cells; dipole moment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, W.; Jiang, D.; Chen, R.; Li, S.; George, T.F. Intrinsic Delocalization during the Decay of Excitons in Polymeric Solar Cells. Polymers 2016, 8, 414.

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