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Role of Localized States on Carrier Transport in Bulk Heterojunction Materials Comprised of Organic Small Molecule Donors
Author(s) -
Zhong Chengmei,
Huang Fei,
Cao Yong,
Moses Daniel,
Heeger Alan J.
Publication year - 2014
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.201304791
Subject(s) - materials science , nanosecond , heterojunction , photoconductivity , optoelectronics , transient (computer programming) , range (aeronautics) , chemical physics , molecule , electron mobility , optics , laser , organic chemistry , chemistry , composite material , physics , computer science , operating system
The photocarrier transport properties in two leading molecular bulk‐heterojunction systems, p‐DTS(PTTh 2 ) 2 :PC 71 BM and p‐DTS(FBTTh 2 ) 2 :PC 71 BM, are studied using transient photoconductivity measurements. We find that in these systems shallow trap states are distributed at relatively narrow energy range, giving rise to time‐independent carrier mobility in the nanosecond time regime that evidently contributes to the high performance of molecular‐based OPV devices.