Min Ganghong, Westbrook Robert J E, Jiang Meihuizi, Taddei Margherita, Li Ang, Webb Thomas, Sathasivam Sanjayan, Azaden Amanz, Palgrave Robert G, Ginger David S, Macdonald Thomas J, Haque Saif A
Department of Chemistry and Centre for Processable Electronics, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, U.K.
Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
ACS Energy Lett. 2024 Dec 17;10(1):254-262. doi: 10.1021/acsenergylett.4c02745. eCollection 2025 Jan 10.
Antisolvent treatment is used in the fabrication of perovskite films to control grain growth during spin coating. We study widely incorporated aromatic hydrocarbons and aprotic ethers, discussing the origin of their performance differences in 2D/3D Sn perovskite (PEAFASnI) solar cells. Among the antisolvents that we screen, diisopropyl ether yields the highest power conversion efficiency in solar cells. We use a combination of optical and structural characterization techniques to reveal that this improved performance originates from a higher concentration of 2D phase, distributed evenly throughout the 2D/3D Sn perovskite film, leading to better crystallinity. This redistribution of the 2D phase, as a result of diisopropyl ether antisolvent treatment, has the combined effect of decreasing the Sn defect density and background hole density, leading to devices with improved open-circuit voltage, short-circuit current, and power conversion efficiency.
反溶剂处理用于钙钛矿薄膜的制备过程中，以在旋涂过程中控制晶粒生长。我们广泛研究了芳烃和非质子醚，讨论了它们在二维/三维锡钙钛矿（PEAFASnI）太阳能电池中性能差异的来源。在我们筛选的反溶剂中，二异丙醚在太阳能电池中产生了最高的功率转换效率。我们结合光学和结构表征技术来揭示这种性能的提高源于二维相的更高浓度，其均匀分布在二维/三维锡钙钛矿薄膜中，从而导致更好的结晶度。由于二异丙醚反溶剂处理导致的二维相的这种重新分布，具有降低锡缺陷密度和背景空穴密度的综合效果，从而使器件的开路电压、短路电流和功率转换效率得到提高。
