Benzothieno[3,2-b]thiophene-Based Noncovalent Conformational Lock Achieves Perovskite Solar Cells with Efficiency over 24 %
By
Zhang, H (Zhang, Heng) [1] ; Yu, X (Yu, Xin) [3] ; Li, MJ (Li, Mengjia) [4] ; Zhang, ZL (Zhang, Zuolin) [4] ; Song, ZL (Song, Zonglong) [6] , [7] ; Zong, XP (Zong, Xueping) [1] ; Duan, GT (Duan, Gongtao) [2] ; Zhang, WF (Zhang, Wenfeng) [2] ; Chen, C (Chen, Cong) [4] ; Zhang, WH (Zhang, Wen-Hua) [5] ; Liu, YS (Liu, Yongsheng) [6] , [7] ; Liang, M (Liang, Mao) [1]
Early Access
NOV 2023
Indexed
2023-12-12
Document Type
Article; Early Access
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Abstract
Organic semiconductors with noncovalently conformational locks (OSNCs) are promising building blocks for hole-transporting materials (HTMs). However, lack of satisfied neighboring building blocks negatively impacts the optoelectronic properties of OSNCs-based HTMs and imperils the stability of perovskite solar cells (PSCs). To address this limitation, we introduce the benzothieno[3,2-b]thiophene (BTT) to construct a new OSNC, and the resulting HTM ZS13 shows improved intermolecular charge extraction/transport properties, proper energy level, efficient surface passivation effect. Consequently, the champion devices based on doped ZS13 yield an efficiency of 24.39 % and 20.95 % for aperture areas of 0.1 and 1.01 cm2, respectively. Furthermore, ZS13 shows good thermal stability and the capability of inhibiting I- ion migration, thus, leading to enhanced device stability. The success in neighboring-group engineering can triggered a strong interest in developing thienoacene-based OSNCs toward efficient and stable PSCs.
This work developed benzothieno[3,2-b]thiophene-based noncovalently conformational locks for organic HTMs ZS13, which shows good charge transfer properties, thermal stability and passivation function. Perovskite solar cells using ZS13 as doped HTM yield a champion device efficiency of 24.39 % with good thermal and light stability.
