Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.073
Publication date: 16th December 2024
The presence of mobile ions in metal halide perovskite materials and charge transport layers have been shown to adversely affect the efficiency, hysteresis and stability of perovskite solar cells (PSCs). Li-TFSI doped Spiro-OMeTAD is the most used hole transport material in n-i-p perovskite solar cells. In the process of device preparation, Li+ ions diffuse on the surface of metal electrode, which promotes the oxidation of Spiro-OMeTAD, improves the conductivity of Spiro-OMeTAD. Meanwhile, it is accompanied by the migration of Li+ into the cells and enrichment at the perovskite/SnO2 interface, which promote the extraction efficiency of electrons. [J. Mater. Chem. A. 2021, 9,7575–7585.] However, during the operation of the device, the migration of Li+ in SnO2 will cause hysteresis and "burn-in" degradation. By introducing a thin layer of cross-linked fullerene (CL-PCBM) at the SnO2/perovskite interface, the "burn-in" degradation can be suppressed. It was revealed that CL-PCBM can fix Li+ ions in the SnO2/perovskite interface, and the introduction of CL-PCBM can increase the built-in potential of the device and improve the electron extraction efficiency. Finally, the power conversion efficiency of 24.19% was achieved, and the "burn-in" degradation process was also eliminated. [Adv. Mater. 2023, 35, 2207656; Adv. Energy Mater.,2023, 2301161]
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