Molten Salt Strategy for Reproducible Evaporation of Efficient Perovskite Solar Cells,Advanced Functional Materials

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Molten Salt Strategy for Reproducible Evaporation of Efficient Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-12-20 , DOI: 10.1002/adfm.202211232
Hang Li ₁ , Liguo Tan ₁ , Chaofan Jiang ₁ , Minghao Li ₁ , Junjie Zhou ₁ , Yiran Ye ₁ , Yue Liu ₁ , Chenyi Yi ₁

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Vacuum evaporation is promising for the scalable fabrication of perovskite solar cells (PSCs). Nevertheless, the poor thermal conductivity of metal halide powder leads to unfavorable temperature inhomogeneity, which destabilizes the evaporation rate, posing a major challenge to the reproducible deposition of perovskite films, particularly by coevaporation. Herein, a molten salt strategy is reported for sequentially vacuum evaporation of PSCs. The molten salt increases the thermal conductivity of metal halides and greatly homogenizes the temperature, which stabilizes the evaporation rate and the composition of the resulting perovskite films. The PSCs yield power conversion efficiencies (PCEs) of ≈24% with exceptional reproducibility. The unencapsulated PSCs maintain 85% of the initial PCE after 3600 h of maximum power point tracking and maintain 85% of the initial PCE after being heated at 60 °C for 3000 h. The molten salt strategy opens a new avenue for the application of evaporation in perovskite optoelectronics.

中文翻译：

高效钙钛矿太阳能电池可重复蒸发的熔盐策略

真空蒸发有望用于钙钛矿太阳能电池 (PSC) 的可扩展制造。然而，金属卤化物粉末的导热性差会导致不利的温度不均匀性，从而使蒸发速率不稳定，对钙钛矿薄膜的可重复沉积构成重大挑战，特别是通过共蒸发。在此，报告了一种用于连续真空蒸发 PSC 的熔盐策略。熔盐增加了金属卤化物的热导率并极大地均匀化了温度，从而稳定了蒸发速率和所得钙钛矿薄膜的成分。PSC 产生 ≈24% 的功率转换效率 (PCE)，并具有出色的重现性。未封装的 PSC 在最大功率点跟踪 3600 小时后保持初始 PCE 的 85%，在 60°C 加热 3000 小时后保持初始 PCE 的 85%。熔盐策略为蒸发在钙钛矿光电领域的应用开辟了一条新途径。

更新日期：2022-12-20

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