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Oligothiophene‐Bridged Bis(arylene ethynylene) Small Molecules for Solution‐Processible Organic Solar Cells with High Open‐Circuit Voltage
Author(s) -
Liu Qian,
Zhan Hongmei,
Ho CheukLam,
Dai FengRong,
Fu Yingying,
Xie Zhiyuan,
Wang Lixiang,
Li JinHua,
Yan Feng,
Huang ShuPing,
Wong WaiYeung
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300244
Subject(s) - arylene , homo/lumo , open circuit voltage , organic solar cell , materials science , acceptor , energy conversion efficiency , small molecule , electron acceptor , polymer solar cell , acetylide , molecule , photochemistry , polymer chemistry , chemistry , aryl , optoelectronics , organic chemistry , alkyl , polymer , voltage , biochemistry , physics , quantum mechanics , composite material , condensed matter physics
A new series of conjugated oligothiophene‐bridged bis(arylene ethynylene) small molecules have been designed, synthesized, and characterized by photophysical, electrochemical and computational methods. These compounds were found to have optimal LUMO levels that ensure effective charge transfer from these compounds to [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (PC 70 BM). They were utilized as good electron‐donor materials that can be blended with electron‐acceptor PC 70 BM in the fabrication of solution‐processed molecular bulk heterojunction (BHJ) solar cells . All of these BHJ devices showed very high open‐circuit voltage ( V oc ) of 0.90–0.97 V, and the best power conversion efficiency achieved was 3.68 %. The high V oc is consistent with the deeper low‐lying HOMO level and is relatively insensitive to the donor : acceptor blend ratio. The spin‐coated thin films of these small molecules showed p‐channel field‐effect charge transport with the hole mobilities of up to 2.04×10 −4 cm 2 V −1 s −1 . These compounds illuminate the potential of solution‐processible small‐molecular aryl acetylide compounds for efficient power generation in photovoltaic implementation.