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Direct Measurement of Electric Field‐Assisted Charge Separation in Polymer:Fullerene Photovoltaic Diodes
Author(s) -
Marsh R. Alex,
Hodgkiss Justin M.,
Friend Richard H.
Publication year - 2010
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.201001010
Subject(s) - photocurrent , materials science , photovoltaic system , charge (physics) , electric field , optoelectronics , fullerene , charge carrier , absorption (acoustics) , diode , transient (computer programming) , field (mathematics) , engineering physics , electrical engineering , computer science , chemistry , physics , organic chemistry , mathematics , pure mathematics , operating system , quantum mechanics , composite material , engineering
The electric field dependence of transient optical absorption of photogenerated charge carriers in working organic photovoltaic cells is reported. Charge lifetimes are extended under reverse bias, revealing that the mechanism of photocurrent generation is the electric field‐assisted separation of Coulombically bound charge pairs in kinetic competition with geminate charge recombination.