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Chalcogen‐Atom‐Annulated Perylene Diimide Trimers for Highly Efficient Nonfullerene Polymer Solar Cells
Author(s) -
Duan Yuwei,
Xu Xiaopeng,
Li Ying,
Li Zuojia,
Peng Qiang
Publication year - 2017
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201700405
Subject(s) - perylene , diimide , chalcogen , trimer , organic solar cell , polymer , materials science , polymer chemistry , chemistry , crystallography , dimer , organic chemistry , molecule
Abstract This communication reports the synthesis of two novel chalcogen‐atom‐annulated perylene diimide (PDI) trimers with twisted structures, TriPDI‐S and TriPDI‐Se, for efficient nonfullerene polymer solar cells. TriPDI‐Se exhibits more compact molecular arrangement due to the stronger intermolecular interactions induced by the selenium atom. This selenium annulation endows TriPDI‐Se with improved absorption and crystallinity in its blend film. The resulting devices exhibit enhanced J sc of 17.15 mA cm −2 and fill factor (FF) of 66.8%, which are much higher than those of TriPDI‐S devices ( J sc = 16.71 mA cm −2 ; FF = 63.6%). Although TriPDI‐Se exhibits lower‐lying energy levels, TriPDI‐Se devices still obtain a higher V oc of 0.77 V compared to TriPDI‐S devices ( V oc = 0.74 V), which is mainly originated from the reduced recombination in the related devices. Finally, the power conversion efficiency is significantly elevated from 7.86% for TriPDI‐S devices to 8.82% for TriPDI‐Se devices.