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Ultrafast Charge Transfer in Operating Bulk Heterojunction Solar Cells
Author(s) -
Zhong Chengmei,
Choi Hyosung,
Kim Jin Young,
Woo Han Young,
Nguyen Thanh Luan,
Huang Fei,
Cao Yong,
Heeger Alan J.
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201405284
Subject(s) - ultrashort pulse , materials science , ultrafast laser spectroscopy , nanosecond , exciton , optoelectronics , charge (physics) , heterojunction , solar cell , spectroscopy , chemical physics , optics , condensed matter physics , physics , laser , quantum mechanics
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 femtoseconds and a slow process from picoseconds 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.