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DOE OSTI · 1657791

Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites

Pavlovetc, Ilia M.·Brennan, Michael C.·Draguta, Sergiu·Ruth, Anthony·Moot, Taylor·Christians, Jeffrey A.·Aleshire, Kyle·Harvey, Steven P.·Toso, Stefano·Nanayakkara, Sanjini U.·Messinger, Jonah·Luther, Joseph M.·Kuno, Masaru
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Abstract

Ion migration represents an intrinsic instability of metal halide perovskite solar cells. In this work, we show that triple-cation FA x MA y Cs 1–x–y PbI 3 [FA + = (NH 2 ) 2 CH + , MA + = CH 3 NH 3 + ] active layers with mixed orthorhombic, post-perovskite (δ ortho -CsPbI 3 ), and cubic perovskite (α) phases (i.e., α/δ-phase FA x MA y Cs 1–x–y PbI 3 ) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA 0.85 Cs 0.15 PbI 3 and FA 0.76 MA 0.15 Cs 0.09 PbI 3 ). 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 FA x MA y Cs 1–x–y PbI 3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FA x MA y Cs 1–x–y PbI 3 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 FA x MAyCs 1–x–y PbI 3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.

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14 SOLAR ENERGYCationsGeneticsPerovskitesSolar cellsStabilitycation migrationperovskites

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Pavlovetc, Ilia M., Brennan, Michael C., Draguta, Sergiu, Ruth, Anthony, Moot, Taylor, Christians, Jeffrey A., Aleshire, Kyle, Harvey, Steven P., Toso, Stefano, Nanayakkara, Sanjini U., Messinger, Jonah, Luther, Joseph M., Kuno, Masaru. 2020-08-03. Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites. https://doi.org/10.1021/acsenergylett.0c01207

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