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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Ultrafast Charge Transfer in Operating Bulk Heterojunction Solar Cells

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Title
Ultrafast Charge Transfer in Operating Bulk Heterojunction Solar Cells
Author
Zhong, ChengmeiChoi, HyosungKim, Jin YoungWoo, Han YoungNguyen, Thanh LuanHuang, FeiCao, YongHeeger, Alan J.
Keywords
Bulk heterojunctions; Organic solar cells; Transient reflection spectroscopy; Ultrafast charge transfer
Issue Date
201503
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.27, no.12, pp.2036 - 2041
Abstract
The ultrafast charge generation process in organic solar cell devices is investigated by transient reflection spectroscopy on five state-of-the-art bulk heterojunction systems. The charge generation process in operating devices is found to be a combination of an ultrafast generation mechanism over several hundred femto-seconds and a slow process from pico-seconds to nanoseconds, limited by exciton diffusion dynamics. In addition, the lack of electric field dependence in the charge dynamics rules out geminate recombination as an important loss mechanism
URI
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DOI
http://dx.doi.org/10.1002/adma.201405284
ISSN
0935-9648
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