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Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-03 , DOI: 10.1021/acsenergylett.0c01207 Ilia M. Pavlovetc 1 , Michael C. Brennan 1, 2 , Sergiu Draguta 3 , Anthony Ruth 4 , Taylor Moot 5 , Jeffrey A. Christians 5, 6 , Kyle Aleshire 1 , Steven P. Harvey 5 , Stefano Toso 2, 7 , Sanjini U. Nanayakkara 5 , Jonah Messinger 5 , Joseph M. Luther 5 , Masaru Kuno 1, 8
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-03 , DOI: 10.1021/acsenergylett.0c01207 Ilia M. Pavlovetc 1 , Michael C. Brennan 1, 2 , Sergiu Draguta 3 , Anthony Ruth 4 , Taylor Moot 5 , Jeffrey A. Christians 5, 6 , Kyle Aleshire 1 , Steven P. Harvey 5 , Stefano Toso 2, 7 , Sanjini U. Nanayakkara 5 , Jonah Messinger 5 , Joseph M. Luther 5 , Masaru Kuno 1, 8
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Ion migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1–x–yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1–x–yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging and time-of-flight secondary ion mass spectrometry are used to visualize exclusive α-phase perovskite lateral device A+ cation accumulation (depletion) at perovskite negative (positive) electrode interfaces. The resulting compositional heterogeneities lead to degradation. Operational stability testing of solar cells reveals similar degradation behavior; α/δ-phase FAxMAyCs1–x–yPbI3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FAxMAyCs1–x–yPbI3 stability is rationalized by δortho-phase inclusions, acting as barriers through which A+ cations do not easily migrate. This study thus provides new insights into cation migration in FAxMAyCs1–x–yPbI3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.
中文翻译：
抑制三阳离子卤化钙钛矿中的阳离子迁移
离子迁移表示金属卤化物钙钛矿太阳能电池的固有不稳定性。在这里，我们显示了带有正斜方晶，后钙钛矿混合态的三阳离子FA x MA y Cs 1– x – y PbI 3 [FA + =（NH 2）2 CH +，MA + = CH 3 NH 3 + ]活性层δ邻-CsPbI 3）和立方钙钛矿（α）相（即，α/δ相FA x MA y Cs 1– x – y PbI 3）相对于纯α相钙钛矿（即FA 0.85 Cs 0.15 PbI 3和FA 0.76 MA 0.15 Cs 0.09 PbI 3）表现出对施加的偏压改善的阳离子稳定性。红外光热外差成像和飞行时间二次离子质谱仪用于可视化钙钛矿负极（正）电极界面处专有的α相钙钛矿侧向装置A +阳离子积累（耗竭）。产生的成分异质性导致降解。太阳能电池的运行稳定性测试显示出类似的降解行为。α/δ相FA x MA y Cs 1–相比之下， x – y PbI 3横向装置/太阳能电池显示出更高的稳定性。增强的α/δ-FA X MA ý铯1- X - ý碘化铅3稳定性是由δ合理化邻-PHASE夹杂物，作为通过其屏障+阳离子不容易迁移。因此，本研究提供了有关FA x MA y Cs 1– x – y PbI 3钙钛矿中阳离子迁移的新见解，并提出了一种抑制杂化钙钛矿中阳离子不稳定性的材料设计策略。
更新日期：2020-09-11
中文翻译：
抑制三阳离子卤化钙钛矿中的阳离子迁移
离子迁移表示金属卤化物钙钛矿太阳能电池的固有不稳定性。在这里，我们显示了带有正斜方晶，后钙钛矿混合态的三阳离子FA x MA y Cs 1– x – y PbI 3 [FA + =（NH 2）2 CH +，MA + = CH 3 NH 3 + ]活性层δ邻-CsPbI 3）和立方钙钛矿（α）相（即，α/δ相FA x MA y Cs 1– x – y PbI 3）相对于纯α相钙钛矿（即FA 0.85 Cs 0.15 PbI 3和FA 0.76 MA 0.15 Cs 0.09 PbI 3）表现出对施加的偏压改善的阳离子稳定性。红外光热外差成像和飞行时间二次离子质谱仪用于可视化钙钛矿负极（正）电极界面处专有的α相钙钛矿侧向装置A +阳离子积累（耗竭）。产生的成分异质性导致降解。太阳能电池的运行稳定性测试显示出类似的降解行为。α/δ相FA x MA y Cs 1–相比之下， x – y PbI 3横向装置/太阳能电池显示出更高的稳定性。增强的α/δ-FA X MA ý铯1- X - ý碘化铅3稳定性是由δ合理化邻-PHASE夹杂物，作为通过其屏障+阳离子不容易迁移。因此，本研究提供了有关FA x MA y Cs 1– x – y PbI 3钙钛矿中阳离子迁移的新见解，并提出了一种抑制杂化钙钛矿中阳离子不稳定性的材料设计策略。
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