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Nonfullerene Polymer Solar Cells with 8.5% Efficiency Enabled by a New Highly Twisted Electron Acceptor Dimer
Ye-Jin Hwang1, Haiyan Li1, Brett A E Courtright1
1Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2015
Abstract:
Fullerene-free and processing additive-free 8.5% efficient polymer solar cells are achieved by using a new 3,4-ethylenedioxythiophene-linked arylene diimide dimer with a 76° twist angle. The devices combine high (78-83%) external quantum efficiency with high (0.91-0.95 V) photovoltages and thus have relatively low optical bandgap energy loss.

