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Energy‐Level Modulation of Small‐Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells
Author(s) -
Li Sunsun,
Ye Long,
Zhao Wenchao,
Zhang Shaoqing,
Mukherjee Subhrangsu,
Ade Harald,
Hou Jianhui
Publication year - 2016
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201602776
Subject(s) - homo/lumo , materials science , energy conversion efficiency , polymer , molecule , voltage , open circuit voltage , small molecule , modulation (music) , electron , optoelectronics , photochemistry , nanotechnology , chemical physics , organic chemistry , electrical engineering , chemistry , physics , biochemistry , quantum mechanics , acoustics , composite material , engineering
Fine energy‐level modulations of small‐molecule acceptors (SMAs) are realized via subtle chemical modifications on strong electron‐withdrawing end‐groups. The two new SMAs (IT‐M and IT‐DM) end‐capped by methyl‐modified dicycanovinylindan‐1‐one exhibit upshifted lowest unoccupied molecular orbital (LUMO) levels, and hence higher open‐circuit voltages can be observed in the corresponding devices. Finally, a top power conversion efficiency of 12.05% is achieved.