Approaching the Fill Factor Limit in Dopant-Free Hole Transporting Layer-Based All-Inorganic Perovskite Solar Cells

• DOI: 10.1021/acsami.2c19954
• Publication Date: 2023-03-10T15:11:44Z
• Authors: Kanghui Zheng; Chang Liu; Kuibao Yu; Yuanyuan Meng; Xu Yin; Shixiao Bu; Shuyuan Lin; Cuirong Liu; Ziyi Ge
• Keywords: Thermal Stability

As an important part of perovskite solar cells (PSCs), hole transporting layer (HTL) has a critical impact on the performance and stability devices. In attempt to alleviate moisture thermal issues from commonly used HTL Spiro-OMeTAD with dopant, it is urgent develop novel HTLs high stability. this study, new class polymers D18 D18-Cl are applied as undoped for CsPbI2Br-based PSCs. addition excellent properties, we unveil that larger expansion coefficient than CsPbI2Br could impose compressive stress onto film upon treatment, which release residual tensile in film. result, efficiency PSCs reaches 16.73%, fill factor (FF) exceeds 85%, one highest FF records conventional-structured device date. The devices also show impressive over 80% initial PCE retained after 85 °C heating 1500 h.