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Ionic Liquid-Mediated Intermediate Phase Adduct Constructing for Highly Stable Lead-Free Perovskite Solar Cells
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-07-06 , DOI: 10.1021/acsmaterialslett.3c00340 Yuhan Zhou 1 , Dongdong Yan 1 , Han Zhang 1 , Yi Jing 1 , Linfeng Chao 2, 3 , Mingguang Li 1 , Meicheng Li 4 , Yonghua Chen 2 , Runfeng Chen 1 , Ligang Xu 1, 5
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-07-06 , DOI: 10.1021/acsmaterialslett.3c00340 Yuhan Zhou 1 , Dongdong Yan 1 , Han Zhang 1 , Yi Jing 1 , Linfeng Chao 2, 3 , Mingguang Li 1 , Meicheng Li 4 , Yonghua Chen 2 , Runfeng Chen 1 , Ligang Xu 1, 5
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The intermediate phase adduct plays a crucial role in constructing uniform and compact tin perovskite films, thus providing an important approach for developing high-performance lead-free perovskite solar cells. However, the common intermediate phase adduct of SnI2·3DMSO in tin perovskite leads to phase separation and may lack compatibility with mixed cation tin perovskites composed of formamidinium (FA) and methylamine (MA), impeding the further device stability. Here, a facile and reproducible method is developed to fabricate high-quality FA0.75MA0.25SnI3 films by introducing a new stable intermediate phase adduct (SnI2·DMSO·MAFa) by using ionic liquid methylamine formate (MAFa). The resulting stable adduct suppresses the reaction rate between ammonium salts and SnI2, thereby modulating the tin perovskite crystallization and precluding SnI2 clusters formation, and the presence of the SnI2·DMSO·MAFa adduct in perovskite precursor serves as a protective barrier for Sn2+ ions, guarding them against oxidation caused by the presence of DMSO. Moreover, the amino and carbonyl groups in residual MAFa could repair the iodine vacancy and uncoordinated Sn2+ ion defects. These features result in the formation of highly uniform and pinhole-free FA0.75MA0.25SnI3 films. The optimized devices achieve a power conversion efficiency (PCE) of over 10%, a value of 53% higher than that of the control device (6.6%). Besides, the obtained MAFa-derived devices illustrate significantly enhanced stability in a microaerobic atmosphere, with 78% maintained initial efficiency over 2800 h of storage under N2 containing 50–100 ppm of O2.
中文翻译：
离子液体介导的中间相加合物构建高稳定无铅钙钛矿太阳能电池
中间相加合物在构建均匀致密的锡钙钛矿薄膜方面发挥着至关重要的作用，从而为开发高性能无铅钙钛矿太阳能电池提供了重要途径。然而，锡钙钛矿中常见的SnI 2 ·3DMSO中间相加合物会导致相分离，并且可能与由甲脒（FA）和甲胺（MA）组成的混合阳离子锡钙钛矿缺乏相容性，从而阻碍了器件的进一步稳定性。这里，开发了一种简便且可重复的方法，通过引入新的稳定中间相加合物（SnI 2·DMSO·MAFa)，采用离子液体甲胺甲酸盐(MAFa)。所得稳定的加合物抑制铵盐和SnI 2之间的反应速率，从而调节锡钙钛矿结晶并阻止SnI 2簇的形成，并且钙钛矿前驱体中SnI 2 ·DMSO·MAFa加合物的存在充当Sn的保护屏障2+离子，保护它们免受 DMSO 存在引起的氧化。此外，残留MAFa中的氨基和羰基可以修复碘空位和不配位的Sn 2+离子缺陷。这些特性导致形成高度均匀且无针孔的 FA 0.75 MA 0.25 SnI 3电影。优化后的器件的功率转换效率（PCE）超过10%，比控制器件（6.6%）高出53%。此外，所获得的 MAFa 衍生器件在微氧气氛中的稳定性显着增强，在含有 50-100 ppm O 2 的 N 2 下储存 2800 小时，初始效率保持在78 %。
更新日期：2023-07-06
中文翻译：
离子液体介导的中间相加合物构建高稳定无铅钙钛矿太阳能电池
中间相加合物在构建均匀致密的锡钙钛矿薄膜方面发挥着至关重要的作用，从而为开发高性能无铅钙钛矿太阳能电池提供了重要途径。然而，锡钙钛矿中常见的SnI 2 ·3DMSO中间相加合物会导致相分离，并且可能与由甲脒（FA）和甲胺（MA）组成的混合阳离子锡钙钛矿缺乏相容性，从而阻碍了器件的进一步稳定性。这里，开发了一种简便且可重复的方法，通过引入新的稳定中间相加合物（SnI 2·DMSO·MAFa)，采用离子液体甲胺甲酸盐(MAFa)。所得稳定的加合物抑制铵盐和SnI 2之间的反应速率，从而调节锡钙钛矿结晶并阻止SnI 2簇的形成，并且钙钛矿前驱体中SnI 2 ·DMSO·MAFa加合物的存在充当Sn的保护屏障2+离子，保护它们免受 DMSO 存在引起的氧化。此外，残留MAFa中的氨基和羰基可以修复碘空位和不配位的Sn 2+离子缺陷。这些特性导致形成高度均匀且无针孔的 FA 0.75 MA 0.25 SnI 3电影。优化后的器件的功率转换效率（PCE）超过10%，比控制器件（6.6%）高出53%。此外，所获得的 MAFa 衍生器件在微氧气氛中的稳定性显着增强，在含有 50-100 ppm O 2 的 N 2 下储存 2800 小时，初始效率保持在78 %。
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