Premium
Synthesis and Photovoltaic Properties of New Multifused Anthradithiophene‐Based Narrow‐Bandgap D–A Copolymers
Author(s) -
Liu QiDa,
Peng RuiXiang,
Chen ShaoJie,
Ai Ling,
Wang SheYu,
Liu ZhiYang,
Ge ZiYi
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400119
Subject(s) - copolymer , materials science , energy conversion efficiency , band gap , polymer solar cell , polymer , photovoltaic system , acceptor , polymer chemistry , electron acceptor , optoelectronics , homo/lumo , chemical engineering , photochemistry , organic chemistry , chemistry , molecule , composite material , physics , ecology , engineering , biology , condensed matter physics
Three structurally novel donor–acceptor copolymers are synthesized and fully characterized using an anthradithiophene (ADT) derivative as the donor block. All of them exhibit broad absorption ranges and moderate hole and electron mobilities. The multifused ADT donor block makes them exhibit lower highest occupied molecular orbital (HOMO) energy levels than many reported benzodithiophene‐based polymers. Copolymer blends with [6,6]‐phenyl C71 butyric acid methyl ester (PC 71 BM) as active layers are used to fabricate polymer solar cells (PSCs) and a variety of post‐treatment methods are employed to optimize the device performance. The conventional and inverted configuration devices are prepared to evaluate the photovoltaic properties. A maximum power conversion efficiency of 1.66% is achieved for the inverted‐configuration device. The improved efficiency is caused by the close energy alignment between the work function of MoO 3 and the HOMO energy levels of the copolymers, facilitating better charge transport and increased short‐circuit current density ( J sc ) with the inverted devices.