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A Solution‐Processable Molecule using Thieno[3,2‐ b ]thiophene as Building Block for Efficient Organic Solar Cells
Author(s) -
Wei Huan,
Chen Weichao,
Han Liangliang,
Wang Ting,
Bao Xichang,
Li Xiaoyun,
Liu Jie,
Zhou Yuanhang,
Yang Renqiang
Publication year - 2015
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.201500476
Subject(s) - thiophene , organic solar cell , stacking , acceptor , molecule , small molecule , materials science , energy conversion efficiency , fullerene , block (permutation group theory) , ring (chemistry) , chemistry , polymer chemistry , photochemistry , organic chemistry , polymer , optoelectronics , biochemistry , physics , geometry , mathematics , composite material , condensed matter physics
A solution‐processed acceptor‐π‐donor‐π‐acceptor (A‐π‐D‐π‐A) type small molecule, namely DCATT, has been designed and synthesized for the application as donor material in organic solar cells. The fused aromatic unit thieno[3,2‐ b ]thiophene (TT) flanked with thiophene is applied as π bridge, while 4,8‐bisthienyl substituted benzodithiophene (BDT) and 2‐ethylhexyl cyanoacetate are chosen as the central building block and end group, respectively. Introduction of fused ring to the small molecule enhances the conjugation length of the main chain, and gives a strong tendency to form π–π stacking with a large overlapping area which favors to high charge carrier transport. Small‐molecule organic solar cells based on blends of DCATT and fullerene acceptor exhibit power conversion efficiencies as high as 5.20 % under the illumination of AM 1.5G, 100 mW cm −2 .