Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 21, Pages 19444-19451Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02964
Keywords
non-fullerene acceptors; polymer solar cells; conjugated lateral chains; steric effect; quantum calculation
Funding
- National Natural Science Foundation of China [U1704137, 21404031, 21574013]
- Program for Changjiang Scholars and Innovative Research Team in University
- Henan Province [2016GGJS-021, 19zx014]
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Two A-pi-D-pi-A-type non-fullerene acceptors (IDT-ToFIC and IDT-TiFIC) with 5-hexylthienyl chains substituted at the inner and outer beta-positions of the thiophene pi-bridge have been designed, respectively. Impacts of varied positional modifications are systematically studied. By utilizing PBDB-T as the donor, polymer solar cells are constructed with these two molecules as acceptors. Power conversion efficiencies of 11.09 and 9.46% are acquired for IDT-ToFIC- and IDT-TiFIC-based devices, respectively. Our studies have demonstrated that the use of thiophene spacers carrying one conjugated side chain at different positions can markedly enhance the photovoltaic properties relative to the corresponding control molecule IDTT2F.
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