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Download fileA Wide Bandgap Polymer Donor Composed of Benzodithiophene and Oxime-Substituted Thiophene for High-Performance Organic Solar Cells
journal contribution
posted on 26.05.2021, 06:43 authored by Keqiang He, Pankaj Kumar, Yi Yuan, Zhifang Zhang, Xu Li, Haitao Liu, Jinliang Wang, Yuning LiOxime-substituted
thiophene (TO) is used as an acceptor (A) unit
to copolymerize with the benzodithiophene (BDT) donor (D) unit to
form a novel D–A polymer donor, PBDTTO, which has a low-lying
highest occupied molecular orbital energy level (EHOMO) of −5.60 eV and a wide bandgap of 2.03 eV,
forming complementary absorption and matching energy levels with the
narrow bandgap nonfullerene acceptors. Organic solar cells using PBDTTO
and Y6 as the donor and acceptor, respectively, exhibited a JSC of 27.03 mA cm–2, a VOC of 0.83 V, and a fill factor of 0.59, reaching
a high power conversion efficiency of 13.29%. The unencapsulated devices
show good long-term stability in ambient air. Compared with the acceptor
monomers used in other high-performance BDT-based D–A polymer
donors, which are synthesized tediously in low yields, the TO acceptor
monomer can be conveniently synthesized in only two steps with a high
overall yield of 70%. These results demonstrate that TO unit can be
used as a promising acceptor unit for developing BDT-based D–A
polymer donors at low cost while maintaining high photovoltaic performance.
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Keywords
energy levelbandgap nonfullerene acceptors2.03 eVOxime-Substituted Thiopheneambient airJ SCpower conversion efficiencyacceptor unitY 6BDT0.83 Vacceptor monomerHigh-Performance Organic Solar Cell...unencapsulated devices showWide Bandgap Polymer Donor ComposedPBDTTOpolymerphotovoltaic performancedonoracceptor monomersenergy levelsE HOMOV OC