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New Benzo[1,2‐ b :4,5‐ b′ ]dithiophene‐Based Small Molecules Containing Alkoxyphenyl Side Chains for High Efficiency Solution‐Processed Organic Solar Cells
Author(s) -
Du Zhengkun,
Chen Weichao,
Wen Shuguang,
Qiao Shanlin,
Liu Qian,
Ouyang Dan,
Wang Ning,
Bao Xichang,
Yang Renqiang
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402865
Subject(s) - chemistry , acceptor , electron acceptor , energy conversion efficiency , organic solar cell , molecule , thermal stability , open circuit voltage , electron donor , materials science , photochemistry , organic chemistry , catalysis , voltage , physics , optoelectronics , quantum mechanics , condensed matter physics , polymer
A new acceptor–donor–acceptor (A–D–A) small molecule, namely, BDT‐PO‐DPP, based on the alkoxyphenyl (PO)‐substituted benzo[1,2‐ b :4,5‐ b′ ]dithiophene (BDT) derivative and the diketopyrrolopyrrole (DPP) unit was synthesized as an electron donor for solution‐processed small‐molecule organic solar cells (SMOSCs). BDT‐PO‐DPP exhibited good thermal stability, with a 5 % weight‐lost temperature at 401 °C under a nitrogen atmosphere. BDT‐PO‐DPP exhibited a lower HOMO energy level of −5.25 eV and a weaker aggregation ability than alkoxy‐substituted BDT‐O‐DPP. A bulk heterojunction SMOSC device based on BDT‐PO‐DPP and [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester was prepared, and it showed a power conversion efficiency up to 5.63 % with a high open‐circuit voltage of 0.83 V, a short circuit current density of 11.23 mA cm −2 , and a fill factor of 60.37 % by using 1,2‐dichlorobenzene as the co‐solvent after thermal annealing at 110 °C. The results indicate that the alkoxyphenyl‐substituted BDT derivative is a promising electron‐donor building block for constructing highly efficient solution‐processed SMOSCs.