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Effects of Side Chains on Thiazolothiazole‐Based Copolymer Semiconductors for High Performance Solar Cells
Author(s) -
Subramaniyan Selvam,
Xin Hao,
Kim Felix Sunjoo,
Shoaee Safa,
Durrant James R.,
Jenekhe Samson A.
Publication year - 2011
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.201100215
Subject(s) - materials science , side chain , stacking , copolymer , energy conversion efficiency , photovoltaic system , semiconductor , polymer solar cell , alkyl , optoelectronics , absorption spectroscopy , absorption (acoustics) , polymer , organic chemistry , optics , composite material , chemistry , ecology , physics , biology
Abstract New thiazolothiazole‐dithienosilole copolymer semiconductors bearing side chains of different type, size, and topology were synthesized and used to demonstrate the influence of side chains on morphology, charge transport and photovoltaic properties. The field effect mobility of holes varied from 0.01‐0.03 cm 2 V −1 s −1 in PSOTT and PSEHTT to 0.12 cm 2 V −1 s −1 in PSOxTT. The average power conversion efficiency of solar cells under 1.0 sun illumination could be varied from 2.1% in PSOxTT and 4.1% in PSOTT to 5.0% in PSEHTT. The highest photovoltaic efficiency achieved in PSEHTT, that has all‐branched alkyl side chains and face‐on π ‐stacking orientation, was corroborated by its enhanced charge photogeneration observed by transient absorption spectroscopy.