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Crystallization and Defect Regulation in Sn–Pb Perovskite Solar Cells via Optimized Anti-Solvent Passivation Strategy
Solar RRL ( IF 6.0 ) Pub Date : 2022-08-12 , DOI: 10.1002/solr.202200398 Lu Pan 1 , Hui Li 1 , Bohong Chang 1 , Longwei Yin 1
Solar RRL ( IF 6.0 ) Pub Date : 2022-08-12 , DOI: 10.1002/solr.202200398 Lu Pan 1 , Hui Li 1 , Bohong Chang 1 , Longwei Yin 1
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Low bandgap tin–lead halide perovskite (PVSK) presents promising opportunities for high-performance solar cells. However, the randomly crystallized Sn–Pb PVSK with a tin-rich surface is easily oxidized, leading to high-level p-type doping, which hinders the performance enhancement of the solar cell devices. Herein, an efficient anti-solvent passivation strategy to regulate defect, crystallization, and energy conversion performance based on anti-solvents composed of chlorobenzene, isopropanol, and methylammonium chloride (MACl) is proposed. It is shown that the Sn–Pb PVSK film gets more moderate and order, with less PbI2 and more α-phase PVSK formed. Furthermore, it is revealed that the surface of the as-processed film is Pb-rich, demonstrating a decrease in the surface p-type concentration, which is more suitable for the photoelectric conversion enhancement of the inverting device. Finally, the MACl-assisted post-treated Sn–Pb PVSK invert solar cells exhibit a high current density of 26.49 mA cm−2 with a open-circuit voltage of 0.70 V and a power conversion efficiency of 16.05%. The modified anti-solvent process fuses the advantage of additive and anti-solvent engineering for growing highly crystallized hybrid tin-lead halide PVSK for photovoltaic devices.
中文翻译：
通过优化的反溶剂钝化策略在 Sn-Pb 钙钛矿太阳能电池中的结晶和缺陷调控
低带隙锡铅卤化物钙钛矿（PVSK）为高性能太阳能电池提供了有希望的机会。然而，具有富锡表面的随机结晶Sn-Pb PVSK容易被氧化，导致高水平的p型掺杂，这阻碍了太阳能电池器件的性能提升。在此，提出了一种基于氯苯、异丙醇和甲基氯化铵 (MACl) 组成的反溶剂的高效反溶剂钝化策略来调节缺陷、结晶和能量转换性能。结果表明，Sn-Pb PVSK 薄膜变得更加温和有序，PbI 2更少并形成更多的α相PVSK。此外，处理后的薄膜表面富含Pb，表明表面p型浓度降低，更适合于反相器件的光电转换增强。最后，MACl 辅助后处理的 Sn-Pb PVSK 反相太阳能电池表现出 26.49 mA cm -2的高电流密度和 0.70 V 的开路电压和 16.05% 的功率转换效率。改进的反溶剂工艺融合了添加剂和反溶剂工程的优势，用于为光伏器件生长高度结晶的混合锡铅卤化物 PVSK。
更新日期：2022-08-12
中文翻译：
通过优化的反溶剂钝化策略在 Sn-Pb 钙钛矿太阳能电池中的结晶和缺陷调控
低带隙锡铅卤化物钙钛矿（PVSK）为高性能太阳能电池提供了有希望的机会。然而，具有富锡表面的随机结晶Sn-Pb PVSK容易被氧化，导致高水平的p型掺杂，这阻碍了太阳能电池器件的性能提升。在此，提出了一种基于氯苯、异丙醇和甲基氯化铵 (MACl) 组成的反溶剂的高效反溶剂钝化策略来调节缺陷、结晶和能量转换性能。结果表明，Sn-Pb PVSK 薄膜变得更加温和有序，PbI 2更少并形成更多的α相PVSK。此外，处理后的薄膜表面富含Pb，表明表面p型浓度降低，更适合于反相器件的光电转换增强。最后，MACl 辅助后处理的 Sn-Pb PVSK 反相太阳能电池表现出 26.49 mA cm -2的高电流密度和 0.70 V 的开路电压和 16.05% 的功率转换效率。改进的反溶剂工艺融合了添加剂和反溶剂工程的优势，用于为光伏器件生长高度结晶的混合锡铅卤化物 PVSK。
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