D–A–D-Typed Hole Transport Materials for Efficient Perovskite Solar Cells: Tuning Photovoltaic Properties via the Acceptor Group

• DOI: 10.1021/acsami.8b04003
• Publication Date: 2018-05-22T09:15:13Z
• Authors: Peng Xu; Peng Liu; Yuanyuan Li; Bo Xu; Lars Kloo; Licheng Sun; Yong Hua
• Keywords: Acceptor; Electron Mobility

Two D-A-D-structured hole-transport materials (YN1 and YN2) have been synthesized used in perovskite solar cells. The two HTMs low-lying HOMO levels impressive mobility. Perovskite-based cells (PSCs) fabricated with YN2 showed a power conversion efficiency (PCE) value of 19.27% ambient air, which is significantly higher than that Spiro-OMeTAD (17.80%). PSCs based on YN1 an inferior PCE 16.03%. We found the incorporation stronger electron-withdrawing group HTM improves PSCs. Furthermore, YN2-based exhibit good long-term stability retaining 91.3% its initial efficiency, whereas retained only 42.2% after 1000 h lifetime (dark conditions). These promising results can provide new strategy for design D-A-D PSC applications future.