講演情報
[18p-M_101-3]Impact of Solvent Extraction Kinetics on the Properties of 2D/3D Tin Halide Perovskite Films and Solar Cells
〇ChienYu Chen1, Fuyuki Harata1, Richard Murdey1, Tomoya Nakamura1, Minh Anh Truong1, Atsushi Wakamiya1 (1.Kyoto Univ.)
キーワード：
perovskite solar cells、tin halide perovskites、antisolvent
Recently, tin halide perovskite solar cells (SnPSCs) have attracted huge research interest as low-toxicity alternatives to lead (Pb) halide perovskite solar cells. Currently, state-of-the-art SnPSCs predominantly utilize 2D/3D tin halide perovskite (SnPVSK) films, typically based on PEAxFA1-xSnI3 (PEA: phenethylammonium; FA: formamidinium) compositions. During spin-coating, antisolvents are often applied to promote nucleation and enhance the properties of the fabricated perovskite films. While the combination of PEA0.15FA0.85SnI3 precursor inks and toluene antisolvent is widely employed, the reported device performances vary substantially across research groups, with open-circuit voltages (VOC) often stagnating around 0.8 V.
In this work, we demonstrate that the key to achieving high-performance SnPSCs lies in the solvent extraction kinetics during the antisolvent step. By utilizing an electronic pipette to regulate the volumetric flow rate of the toluene antisolvent, we found that the duration of toluene antisolvent—rather than the total volume—is the critical factor governing the final film morphology and crystallinity. In this presentation, we will discuss how the solvent extraction kinetics of 2D/3D SnPVSK during antisolvent application affect the structural and optoelectronic properties of the SnPVSK films and the performance of the solar cells. By optimizing the solvent extraction kinetics, we utilized a 0.8 M PEA0.15FA0.85SnI3 precursor solution (with standard tin fluoride and ammonium thiocyanate additives) to achieve SnPSCs with power conversion efficiencies (PCEs) approaching 14%, with VOC values exceeding 0.9 V. The device performance was further enhanced through the incorporation of additional additives.
This research is partially supported by JST-Mirai (JPMJMI22E2) and JSPS (24KF0053).
In this work, we demonstrate that the key to achieving high-performance SnPSCs lies in the solvent extraction kinetics during the antisolvent step. By utilizing an electronic pipette to regulate the volumetric flow rate of the toluene antisolvent, we found that the duration of toluene antisolvent—rather than the total volume—is the critical factor governing the final film morphology and crystallinity. In this presentation, we will discuss how the solvent extraction kinetics of 2D/3D SnPVSK during antisolvent application affect the structural and optoelectronic properties of the SnPVSK films and the performance of the solar cells. By optimizing the solvent extraction kinetics, we utilized a 0.8 M PEA0.15FA0.85SnI3 precursor solution (with standard tin fluoride and ammonium thiocyanate additives) to achieve SnPSCs with power conversion efficiencies (PCEs) approaching 14%, with VOC values exceeding 0.9 V. The device performance was further enhanced through the incorporation of additional additives.
This research is partially supported by JST-Mirai (JPMJMI22E2) and JSPS (24KF0053).