The highest power conversion efficiency of perovskite solar cells is beyond 22%. Charge transport layers are found to be critical for device performance and stability. A traditional electron transport layer (ETL), such as TiO₂, is not very efficient for charge extraction at the interface, especially in planar structure. In addition, the devices using TiO₂ suffer from serious degradation under ultraviolet illumination. SnO₂ owns a better band alignment with the perovskite absorption layer and high electron mobility, which is helpful for electron extraction. In this Review, recent progresses in efficient and stable perovskite solar cells using SnO₂ as ETL are summarized.

中文翻译：

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SnO2：钙钛矿太阳能电池的绝佳电子传输层

钙钛矿太阳能电池的最高功率转换效率超过22％。发现电荷传输层对于器件性能和稳定性至关重要。传统的电子传输层（ETL），例如TiO ₂，对于界面处的电荷提取不是非常有效，特别是在平面结构中。另外，使用TiO ₂的器件在紫外线照射下会严重劣化。SnO ₂具有与钙钛矿吸收层更好的能带排列性和高电子迁移率，这有助于电子提取。在这篇综述中，总结了使用SnO ₂作为ETL的高效，稳定的钙钛矿太阳能电池的最新进展。