Planar perovskite solar cells (PSCs) based on low‐temperature‐processed (LTP) SnO₂ have demonstrated excellent photovoltaic properties duo to the high electron mobility, wide bandgap, and suitable band energy alignment of LTP SnO₂. However, planar PSCs or mesoporous (mp) PSCs based on high‐temperature‐processed (HTP) SnO₂ show much degraded performance. Here, a new strategy with fully HTP Mg‐doped quantum dot SnO₂ as blocking layer (bl) and a quite thin SnO₂ nanoparticle as mp layer are developed. The performances of both planar and mp PSCs has been greatly improved. The use of Mg‐SnO₂ in planar PSCs yields a high‐stabilized power conversion efficiency (PCE) of close to 17%. The champion of mp cells exhibits hysteresis free and stable performance with a high‐stabilized PCE of 19.12%. The inclusion of thin mp SnO₂ in PSCs not only plays a role of an energy bridge, facilitating electrons transfer from perovskite to SnO₂ bl, but also enhances the contact area of SnO₂ with perovskite absorber. Impedance analysis suggests that the thin mp layer is an “active scaffold” selectively collecting electrons from perovskite and can eliminate hysteresis and effectively suppress recombination. This is an inspiring advance toward high‐performance PSCs with HTP mp SnO₂.

中文翻译：

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完全高温处理的SnO2作为阻挡层和支架，用于高效，稳定和无滞后的介孔钙钛矿太阳能电池

基于低温处理（LTP）SnO _2的平面钙钛矿太阳能电池（PSC）由于具有高电子迁移率，宽禁带宽度和LTP SnO ₂合适的能带取向，因此具有出色的光伏性能。但是，基于平面工艺的PSC或基于高温处理（HTP）SnO _2的中孔（mp）PSC表现出很大的性能下降。在这里，开发了一种新的策略，该策略以完全HTP掺杂Mg的量子点SnO ₂作为阻挡层（b1）和相当薄的SnO ₂纳米颗粒作为mp层。平面PSC和mp PSC的性能都得到了极大的提高。Mg-SnO _2的使用平面PSC的功率稳定转换效率（PCE）接近17％。mp电池的冠军表现出无滞后和稳定的性能，高稳定的PCE为19.12％。在PSC中包含薄的mp SnO ₂不仅起到能量桥的作用，促进电子从钙钛矿转移到SnO ₂ bl，而且增加了SnO ₂与钙钛矿吸收剂的接触面积。阻抗分析表明，薄的mp层是“活性支架”，可以选择性地从钙钛矿中收集电子，并且可以消除磁滞现象并有效地抑制复合。这是朝着配备HTP mp SnO ₂的高性能PSC迈进的令人鼓舞的进步。