In:
Chemistry – A European Journal, Wiley, Vol. 25, No. 25 ( 2019-05-02), p. 6385-6391
Abstract:
One pair of isomers, centrosymmetric anti ‐ Py ‐ 1 and axisymmetric syn ‐ Py ‐ 2 , was designed and synthesized with an acceptor–donor–acceptor (A–D–A) structure by choosing dithienocyclopentapyrene with four 4‐hexylphenyl side chains as the D unit, and 2‐(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1 H ‐inden‐1‐ylidene) malononitrile as the A unit. In‐depth structure–property relationship studies revealed that the isomers have similar UV/Vis absorption, fluorescence emission, and energy levels but significant differences in molecular shape, polarity, and charge mobility. Solution‐processed bulk‐heterojunction (BHJ) small‐molecule organic solar cells with Py ‐ 1 as the electron‐acceptor material and PTB7‐Th as the electron‐donor material exhibit a power conversion efficiency (PCE) of 6.07 %, or 60 % higher than that of Py ‐ 2 (3.7 %), which could be mainly attributed to the higher and more balanced hole/electron mobilities and better phase separation of the Py ‐ 1 ‐based active layer.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.201900296
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1478547-X