Open AccessNovel Dimethylmethylene‐Bridged Triphenylamine‐PDI Acceptor for Bulk‐Heterojunction Organic Solar Cells
Author(s) -
Xiong Yu,
Wu Bo,
Zheng Xiaoyan,
Zhao Zheng,
Deng Ping,
Lin Ming,
Tang Benzhong,
Ong Beng S.
Publication year - 2017
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201700110
Subject(s) - triphenylamine , organic solar cell , acceptor , perylene , photochemistry , materials science , electron acceptor , intramolecular force , diimide , intermolecular force , delocalized electron , electron donor , chemistry , polymer , molecule , physics , organic chemistry , catalysis , composite material , condensed matter physics
A novel, star‐shaped electron acceptor, DMTPA‐PDI 3 , derived from a planar dimethylmethylene‐bridged triphenylamine core with three acetylene‐linked perylene diimide (PDI) units is developed as a nonfullerene acceptor for organic solar cells (OSCs). DMTPA‐PDI 3 manifests significantly reduced intramolecular twisting, enabling sufficient system‐wide π‐electron delocalization leading to broadened spectral absorption and raised lowest unoccupied molecular orbital level. As a result, higher and more balanced hole and electron transport properties are observed. Active layers for OSCs comprising DMTPA‐PDI 3 acceptor and PBT7‐Th donor exhibit suppressed intermolecular aggregation, giving rise to uniform nanophase network formation. These OSC devices have afforded respectably high power‐conversion efficiency of about 5%.