Premium
Manifestation of Carrier Relaxation Through the Manifold of Localized States in PCDTBT:PC 60 BM Bulk Heterojunction Material: The Role of PC 84 BM Traps on the Carrier Transport
Author(s) -
Leong Wei Lin,
HernandezSosa Gerardo,
Cowan Sarah R.,
Moses Daniel,
Heeger Alan J.
Publication year - 2012
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.201104192
Subject(s) - materials science , relaxation (psychology) , impurity , heterojunction , charge carrier , chemical physics , polymer solar cell , optoelectronics , electron mobility , condensed matter physics , solar cell , physics , quantum mechanics , psychology , social psychology
The transport and relaxation of photogenerated carriers in a bulk heterojunction (BHJ) material made of a blend of PCDTBT and PC 60 BM are studied as a function of the concentration of PC 84 BM impurities. For low concentrations of PC 84 BM, the increasing activation energy with delay time indicates transport dominated by trap‐limited carrier drift while the photocarriers relax through a manifold of disorder‐induced localized states near the band edge. In the BHJ material with high concentration of PC 84 BM, transport is dominated by carrier hopping within the PC 84 BM impurity band.