Electric-field-induced aging dynamics of triple-cation lead iodide perovskite at nanoscale

IF 6.3 2区材料科学 Q2 ENERGY & FUELS Solar Energy Materials and Solar Cells Pub Date : 2024-12-03 DOI:10.1016/j.solmat.2024.113305

Nikita A. Emelianov , Victoria V. Ozerova , Yuri S. Fedotov , Elena V. Shchurik , Nikita A. Slesarenko , Mikhail V. Zhidkov , Eugeniy V. Golosov , Rasim R. Saifutyarov , Lyubov A. Frolova , Pavel A. Troshin

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Abstract

Herein, we report the nanoscale cations dynamics in Cs_0.1MA_0.15FA_0.75PbI₃ films during the electric-field-induced aging process using infrared scattering scanning near-field microscopy (IR s-SNOM) combined with a series of complementary analytical techniques such as PL-microscopy, SEM/EDX and ToF-SIMS. The revealed major field-induced aging pathways are related to the anodic oxidation of I⁻ and the cathodic reduction of MA⁺ and FA⁺, which finally result in the depletion of organic species in the device channel and the formation of metallic lead. FA⁺ cations show significantly higher stability with respect to electrochemical reduction as compared to MA⁺ cations. Formamidinium cations are preserved on the surface of the near-cathode film area even after 40 days of the 1 V/μm field exposure, while MA⁺ cations demonstrate complete decomposition after 24 days. The obtained results demonstrate that IR s-SNOM represents a powerful technique for studying the spatially resolved field-induced degradation dynamics of hybrid perovskite absorbers and the identification of more promising materials resistant to the electric field.

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纳米尺度下三阳离子碘化铅钙钛矿的电场诱导老化动力学

本文采用红外散射扫描近场显微镜（IR - snom）技术，结合pl显微镜、SEM/EDX和ToF-SIMS等一系列互补分析技术，报道了Cs0.1MA0.15FA0.75PbI3薄膜在电场诱导老化过程中的纳米级阳离子动态。发现的主要场致老化途径与I−的阳极氧化和MA+和FA+的阴极还原有关，最终导致器件通道中有机物质的消耗和金属铅的形成。与MA+阳离子相比，FA+阳离子在电化学还原方面表现出更高的稳定性。在1 V/μm电场作用40天后，近阴极膜区域表面仍保留有甲脒离子，而MA+离子在24天后完全分解。研究结果表明，IR s-SNOM是研究混合钙钛矿吸收剂空间分辨场诱导降解动力学和识别更有前途的耐电场材料的有力技术。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.