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Alkylthio‐Substituted Polythiophene: Absorption and Photovoltaic Properties
Author(s) -
Huo Lijun,
Zhou Yi,
Li Yongfang
Publication year - 2009
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.200800785
Subject(s) - polythiophene , thiophene , side chain , materials science , open circuit voltage , polymer solar cell , polymer , absorption (acoustics) , acceptor , electron acceptor , polymer chemistry , photochemistry , energy conversion efficiency , conductive polymer , photovoltaic system , electron donor , organic chemistry , chemistry , catalysis , voltage , optoelectronics , ecology , physics , quantum mechanics , composite material , biology , condensed matter physics
Two polythiophene derivatives with electron‐donating alkylthio side chains, poly[(3‐hexylthio)thiophene] (P3HST) and poly[(3‐hexylthio)thiophene‐ alt ‐thiophene] (P3HST‐ co ‐Th) have been synthesized and characterized. Both P3HST and P3HST‐ co ‐Th show broader absorption peaks than poly(3‐hexylthiophene). Meanwhile, the alkylthio side chains decrease the HOMO energy level of the polymers, which benefits the higher open circuit voltage of the polymer solar cells (PSCs) based on the polymer as donor. PSCs have been fabricated with the polymers as donor and [6,6]‐phenyl C61 butyric acid methyl ester as acceptor (1: 1, w/w). The devices based on P3HST and P3HST‐ co ‐Th show an open circuit voltage of 0.63 V, and a power conversion efficiency of 0.34% and 0.5%, respectively, under the illumination of AM1.5, 80 mW · cm −2 .