Novel Dimethylmethylene-Bridged Triphenylamine-PDI Acceptor for Bulk-Heterojunction Organic Solar Cells.

ABSTRACT: A novel, star-shaped electron acceptor, DMTPA-PDI₃, 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-PDI₃ manifests significantly reduced intramolecular twisting, enabling sufficient system-wide ?-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-PDI₃ 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%.

SUBMITTER: Xiong Y 

PROVIDER: S-EPMC5644237 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature