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A Fused‐Ring Acceptor Unit in D–A Copolymers Benefits Photovoltaic Performance
Author(s) -
Zuo Chuantian,
Cao Jiamin,
Ding Liming
Publication year - 2014
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.201400196
Subject(s) - copolymer , crystallinity , thiophene , materials science , acceptor , solubility , organic solar cell , photovoltaic system , polymer chemistry , energy conversion efficiency , ring (chemistry) , chemical engineering , chemistry , organic chemistry , polymer , optoelectronics , composite material , ecology , physics , engineering , biology , condensed matter physics
Pentacyclic lactam acceptor unit TPTI invented by our group is proved to be a good building block for efficient D‐A copolymers used in organic solar cells. Here, two D‐A copolymers PBTTPTI and PTTTPTI are developed by copolymerizing TPTI with 2,2′‐bithiophene (BT) or thieno[3,2‐ b ]thiophene (TT). PBTTPTI and PTTTPTI exhibit good solubility and strong interchain π–π interaction even in dilute solution. They possess deep HOMO levels (ca. ‐5.3 eV), partial crystallinity, and good hole mobilities. Blending with PC 71 BM, PBTTPTI and PTTTPTI give decent power conversion efficiencies (PCE) up to 6.83% and 5.86%, with outstanding fill factors (FF) of 74.3% and 71.3%, respectively.