Impact of the Bonding Sites at the Inner or Outer π‑Bridged Positions for Non-Fullerene Acceptors

• Published in: ACS applied materials & interfaces Vol. 11; no. 21; pp. 19444 - 19451
• Main Authors: Ming, Shouli, Zhang, Cai’e, Jiang, Pengcheng, Jiang, Qinglin, Ma, Zaifei, Song, Jinsheng, Bo, Zhishan
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 29.05.2019
• Subjects: and quantum calculation; polymer solar cells; conjugated lateral chains; non-fullerene acceptors; steric effect
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.9b02964

Two A−π–D−π–A-type non-fullerene acceptors (IDT-T o FIC and IDT-T i FIC) with 5-hexylthienyl chains substituted at the inner and outer β-positions of the thiophene π-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-T o FIC- and IDT-T i FIC-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.