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D–π–A–π–A Strategy to Design Benzothiadiazole–carbazole‐based Conjugated Polymer with High Solar Cell Voltage and Enhanced Photocurrent
Author(s) -
Zhou Manxi,
Wang Min,
Zhu Lei,
Yang Zhenqing,
Jiang Chao,
Cao Dapeng,
Li Qifang
Publication year - 2015
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201500466
Subject(s) - carbazole , photocurrent , solar cell , conjugated system , materials science , energy conversion efficiency , polymer , polymer solar cell , band gap , absorption (acoustics) , open circuit voltage , polymer chemistry , optoelectronics , analytical chemistry (journal) , chemistry , voltage , photochemistry , physics , organic chemistry , composite material , quantum mechanics
The theoretical calculations are used to find that D–π–A–π–A style conjugated polymer PC‐TBTBT is more efficient for solar cells application than the D–π–A analog PC‐TBT because the D–π–A–π–A structure has a narrower band gap and higher molar absorption coefficient and redshift spectrum. Motivated by the theoretical prediction, 5,6‐bis(octyloxy)‐2,1,3‐benzothiadiazole and 2,7‐carbazole are adopted to synthesize the D–π–A–π–A style PC‐TBTBT ( M w = 31.1 kDa) and D–π–A analog PC‐TBT ( M w = 87.5 kDa) by Suzuki coupling reaction. Experimental results confirm that D–π–A–π–A PC‐TBTBT ‐based solar cell shows a power conversion efficiency (PCE) of 4.74% with high V OC of 0.99 V and enhanced J SC of 9.70 mA cm −2 . The PCE and J SC achieve improvements of 17% and 26%, respectively, compared to the D–π–A PC‐TBT ‐based solar cell.