Fused Dithienopicenocarbazole Enabling High Mobility Dopant-Free Hole-Transporting Polymers for Efficient and Stable Perovskite Solar Cells

• DOI: 10.1021/acsami.0c21729
• Publication Date: 2021-01-29T18:32:45Z
• Authors: Zilong Zhang; Lusheng Liang; Longhui Deng; Lu Ren; Nan Zhao; Jianhua Huang; Yaming Yu; Peng Gao
• Keywords: Electron Mobility; Acceptor

As a critical component in perovskite solar cells (PSCs), hole-transporting materials (HTMs) have been extensively explored. To develop efficient dopant-free HTMs for PSCs, decent hole mobility (>10–3 cm2 V–1 s–1) is critically essential, which is, however, seldom reported. In this work, we introduce two novel donor–acceptor (D–A) type conjugated polymers (PDTPC-1 and PDTPC-2) with narrow bandgap unit, i.e., fused dithienopicenocarbazole (DTPC), as the donor building block benzo[c][1,2,5]thiadiazole derivatives acceptors. The highly planar strong electron-donating DTPC endows superior up to ∼4 × 10–3 s–1. Because of better energy alignment excellent film-forming property, PSCs PDTPC-1 HTM show an appreciably enhanced PCE ∼17% along improved device stability opposed PDTPC-2. Our work revealed first time that introduction D–A could achieve remarkably high pristine form, favoring application PSCs.