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Nanomorphology of PCDTBT:PC 70 BM Bulk Heterojunction Solar Cells
Author(s) -
Moon Ji Sun,
Jo Jang,
Heeger Alan J.
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100667
Subject(s) - materials science , polymer solar cell , active layer , thiophene , energy conversion efficiency , organic solar cell , optoelectronics , chemical engineering , layer (electronics) , nanotechnology , organic chemistry , polymer , composite material , chemistry , engineering , thin film transistor
The nanomorphology of a bulk heterojunction (BHJ) material constructed from poly[ N ‐ 9′‐hepta‐decanyl‐2,7‐carbazole‐ alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT):[6,6]‐phenyl C 70 ‐butyric acid methyl ester (PC 70 BM) is shown to be laterally oriented, in contrast to the column‐like morphology of the similar poly(3‐hexyl thiophene):PC 60 BM. The lateral orientation in the PCDTBT:PC 70 BM BHJ is not ideal for sweeping charge out at the electrodes. As a result, the power conversion efficiency decreases as the thickness of the BHJ active layer is increased.