氯化物-碘化物基钙钛矿太阳能电池中 SnO2 电子传输层上自形成 SnCl2 钝化层,Advanced Energy and Sustainability Research

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氯化物-碘化物基钙钛矿太阳能电池中 SnO2 电子传输层上自形成 SnCl2 钝化层
Advanced Energy and Sustainability Research ( IF 6.2 ) Pub Date : 2024-03-15 , DOI: 10.1002/aesr.202400030
Ashraful Hossain Howlader ₁ , Shahriyar Safat Dipta ₁ , Walia Binte Tarique ₁ , Yulun Qi ₁ , Ayush Pratik ₁ , Yao Yin ₂ , Md Anower Hossain ₁ , Ashraf Uddin ₁

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观察到钙钛矿/电子传输层（ETL）界面处自形成钝化层的现象。FA _0.6 MA _0.4 PbI _{3− x} Cl _x钙钛矿薄膜沉积在SnO ₂纳米粒子薄膜ETL上。从深度分辨光谱观察到Sn ²⁺离子向ETL内的钙钛矿层迁移。同时，Cl ^-离子也向钙钛矿层内的 ETL 迁移。这种独特的离子迁移现象使我们得出结论：在钙钛矿/ETL界面处形成了钝化SnCl _2层。发现界面处的该SnCl _2层与Al₂ O ₃一样起到钝化层的作用。这种自形成的钝化层对于器件效率和稳定性的提高有着显着的作用。据信，该SnCl ₂钝化层有助于减少界面处的复合损失并提高钙钛矿太阳能电池（PSC）的性能。钙钛矿/空穴传输层也用辛基溴化铵钝化。最后，PSC 在 1 个太阳和 AM1.5 G 条件下提供了 20.81% 的光转换效率 (PCE)。再次，在露天房间条件下，白光发光二极管，85℃连续加热12小时以上，无需封装，仍保持80%以上的PCE。

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Self-Formation of SnCl2 Passivation Layer on SnO2 Electron-Transport Layer in Chloride–Iodide-Based Perovskite Solar Cell

The phenomenon of the self-formation of a passivation layer at the interface of the perovskite/electron-transport layer (ETL) is observed. FA_0.6MA_0.4PbI_3−xCl_x perovskite thin film is deposited on a SnO₂ nanoparticle thin-film ETL. It is observed from the depth-resolved spectroscopy that the Sn²⁺ ion migrates toward the perovskite layer within the ETL. At the same time, Cl⁻ ion also migrates toward ETL within the perovskite layer. This unique ion migration phenomenon leads us to conclude that a passivating SnCl₂ layer is formed at the perovskite/ETL interface. It is found that this SnCl₂ layer at the interface works as a passivation layer like Al₂O₃. There is a significant effect of this self-formed passivating layer behind the improvement of the device's efficiency and stability. It is believed that this SnCl₂ passivation layer helps to reduce the recombination loss at the interface and boosts the performance of the perovskite solar cell (PSC). The perovskite/hole-transport layer is also passivated with octylammonium bromide. Finally, the PSC offers a photoconversion efficiency (PCE) of 20.81% under 1 sun and AM1.5 G condition. Again, it maintains more than 80% of PCE under open-air room conditions, white light emitting diode, and 85 °C continuous heating for more than 12 h without encapsulation.

更新日期：2024-03-16

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