Decorating hole transport material with −CF_(3) groups for highly efficient and stable perovskite solar cells  

作　　者：Bin Li Yuan Cai Xia Tian Xiaozhong Liang Da Li Zheng Zhang Sijing Wang Kunpeng Guo Zhike Liu 

机构地区：[1]Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China [2]Key Laboratory of Applied Surface and Colloid Chemistry,Ministry of Education,Shaanxi Engineering Lab for Advanced Energy Technology,School of Materials Science and Engineering,Shaanxi Normal University,Xi’an,Shaanxi 710119,China

出　　处：《Journal of Energy Chemistry》2021年第11期523-531,I0012,共10页能源化学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(62074095);the Fundamental Research Funds for the Central Universities(GK202002001).

摘　　要：The hole transport material (HTM) plays an extremely important role to determine the power conversion efficiency (PCE) and the stability of perovskite solar cells (PSCs). Herein, we report an effective strategy to improve the performance of HTMs by introducing −CF_(3) groups via the rational decorative mode. Upon direct attachment or nonconjugated alkoxyl bridging of −CF_(3) groups on the terminal diphenylamines, the resulting molecular HTMs, i.e., 2,7-BCzA4CF_(3) and 2,7-BCzA4OCCF_(3), show distinct properties. Compared with 2,7-BCzA4CF_(3), the nonconjugated alkoxyl bridging −CF_(3) group-based 2,7-BCzA4OCCF_(3) exhibits better thermal stability, hydrophobicity, and a dramatically upgraded hole mobility by 135.7-fold of magnitude to 1.71 × 10^(−4) cm^(2) V^(−1) S^(−1). The PSCs with 2,7-BCzA4OCCF_(3) as HTM exhibit an PCE of up to 20.53% and excellent long-term stability, maintaining 92.57% of their performance for 30 days in air with humidity of 30% without encapsulation. This work provides beneficial guidelines for the design of new HTMs for efficient and stable PSCs.

关 键 词：Perovskite solar cell Hole transport material Decorating group Trifluoromethyl group Nonconjugated alkoxyl bridging 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]