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Polymer Acceptor Based on B←N Units with Enhanced Electron Mobility for Efficient All‐Polymer Solar Cells
Author(s) -
Zhao Ruyan,
Dou Chuandong,
Xie Zhiyuan,
Liu Jun,
Wang Lixiang
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201601305
Subject(s) - polymer , electron acceptor , steric effects , acceptor , conjugated system , stacking , polymer solar cell , materials science , energy conversion efficiency , electron mobility , electron donor , photochemistry , polymer chemistry , chemistry , organic chemistry , optoelectronics , catalysis , physics , composite material , condensed matter physics
We demonstrate that polymer electron acceptors with excellent all‐polymer solar‐cell (all‐PSC) device performance can be developed from polymer electron donors by using B←N units. By alleviating the steric hindrance effect of the bulky pendant moieties on the conjugated polymers that contain B←N units, the π–π stacking distance of polymer backbones is decreased and the electron mobility is consequently enhanced by nearly two orders of magnitude. As a result, the power conversion efficiency of all‐PSCs with the polymer acting as the electron acceptor is greatly improved from 0.12 % to 5.04 %. This PCE value is comparable to that of the best all‐PSCs with state‐of‐the‐art polymer acceptors.