Passivating perovskite interface defects through electron transport layers (ETLs) has become an effective strategy to improve the performance of perovskite solar cells (PSCs ). National Taiwan University , Ken-Tsung Wong, Mingzhi University of Science and Technology, Chih-Ping Chen and others used dithieno[2,3-d:2′,3′-d′]thieno[3,2-b:3′, 2′-b′]Dipyrrole (DTPT)-based acceptor-donor-acceptor (A–D–A) consists of molecules composed of coplanar heteroacene as an electron-donating core with various electron acceptors at the ends. The body part serves as an ETL modifier for PSCs.
Using PCBM:DTPTCY as ETL will lead to passivation of perovskite defects, promotion of energy alignment at the ETL/perovskite interface, and improvement of carrier transport efficiency. The optimized ETL-based hybrid Cs0.18FA0.82Pb(I0.8Br0.2) 3-pin PSC exhibits 37.2% and 39.9% performance under TL84 and 3000K LED (1000 lux), respectively.
The DTPTCY-based device showed excellent stability, retaining 87% of the initial efficiency (PCE ) after 30 days of storage in a 40% relative humidity (RH) air environment without any encapsulation, exceeding the 67% of the original PCE alone. control device. These findings highlight the potential of interfacial modifications based on ADA-type molecules to enhance passivation and contact properties, ultimately leading to efficient and stable PSCs.
B.-H. Jiang, Z.-J. Gao, C.-Y. Lung, Z.-E. Shi, H.-Y. Du, Y.-W. Su, H.-S. Shih, K .-M. Lee, H.-H. Hung, CK Chan, C.-P. Chen, K.-T. Wong, Enhancing the Efficiency of Indoor Perovskite Solar Cells through Surface Defect Passivation with Coplanar Heteroacene Cored A–D– A-type Molecules. Adv. Funct. Mater. 2023, 2312819.
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