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Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells.

Advanced materials (Deerfield Beach, Fla.) (2016-09-09)
Sunsun Li, Long Ye, Wenchao Zhao, Shaoqing Zhang, Subhrangsu Mukherjee, Harald Ade, Jianhui Hou
ABSTRACT

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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
ITIC-M
Sigma-Aldrich
ITIC-DM