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A Solution Processable D‐A‐D Molecule based on Thiazolothiazole for High Performance Organic Solar Cells
Author(s) -
Shi Qinqin,
Cheng Pei,
Li Yongfang,
Zhan Xiaowei
Publication year - 2012
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.201100505
Subject(s) - small molecule , organic solar cell , materials science , thermal stability , photovoltaic system , acceptor , annealing (glass) , energy conversion efficiency , molecule , electron mobility , organic molecules , electron acceptor , thermal , optoelectronics , chemical engineering , photochemistry , polymer , organic chemistry , thermodynamics , physics , electrical engineering , chemistry , condensed matter physics , biochemistry , engineering , composite material
A new linear, D‐A‐D small molecule based on thiazolothiazole has been synthesized. It exhibits excellent thermal stability and relatively low HOMO level. By tuning donor to acceptor ratio and thermal annealing, photovoltaic devices based on the blend of this compound and PC 71 BM exhibited perfect phase separation sizes (10–20 nm) and balanced charge transport (electron mobility/hole mobility = 2:1), which leads to power conversion efficiencies as high as 3.73%, among the top reported for solution processed organic solar cells based on small molecules.