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Improved photovoltaic performance of a nonfullerene acceptor based on a benzo[b]thiophene fused end group with extended pi-conjugation

Authors
Yang, KunLiao, QiaoganKoh, Chang WooChen, JianhuaSu, MengyaoZhou, XinTang, YuminWang, YangZhang, YoumingWoo, Han YoungGuo, Xugang
Issue Date
28-4월-2019
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.16, pp.9822 - 9830
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
7
Number
16
Start Page
9822
End Page
9830
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/65962
DOI
10.1039/c9ta01111k
ISSN
2050-7488
Abstract
A new indacenodithiophene-based acceptor-donor-acceptor (A-D-A) type nonfullerene acceptor material ITBTC, featuring a conjugation-extended benzo[b]thiophene-fused end group, was designed and synthesized. Compared to the well known phenyl-fused ITIC acceptor containing a 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) end group, incorporation of an additional electron-rich thiophene into the IC moiety decreased the electron-accepting strength of the end group and increased the intermolecular interactions of ITBTC molecules. As a result, ITBTC exhibited an elevated lowest unoccupied molecular orbital, an improved electron mobility, and a more favorable blend film morphology. Despite its slightly blue-shifted absorption, the photocurrent of ITBTC-based devices was well-maintained due to the extra absorption band in the short wavelength range, which is induced by its conjugation-extended end group. Benefitting from these characteristics, the ITBTC-based solar cells achieved an enhanced power conversion efficiency (PCE) of 10.99% with a simultaneously improved open-circuit voltage (V-oc, 0.94 V) and fill factor (FF, 71.3%) and well-maintained short-circuit current density (J(sc), 16.37 mA cm(-2)), compared to those of the ITIC-based devices (PCE of 9.53%). These results suggest that extending the -conjugation of end group through thiophene incorporation is an efficient approach for optimizing both the energy level alignment and intermolecular interaction of the acceptor materials while maintaining their efficient light-harvesting ability. Our study also demonstrates the great potential of the new benzo[b]thiophene-fused end group for constructing high-performance nonfullerene acceptors and provided insight into overcoming the trade-off between J(sc) and V-oc to realize simultaneously enhanced photovoltaic parameters.
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