In the increasingly rapid development of perovskite solar cells (PSCs), all-inorganic PSCs, especially Br-rich all-inorganic PSCs, not only inherit the advantages of an adjustable bandgap, and excellent light absorption, but also has superior stability. To find a simple-process and low-cost way to increase perovskite performance, we try to adjust the conduction band of CsPbIBr ₂ with the help of dipoles induced by PEI incorporating. Furthermore, we use carbon as the negative electrode to abandon the noble metal and hole transport layer (HTL). Finally, the solar cells with the structure of fluorine-doped tin oxide (FTO)/TiO ₂ /CsPbIBr ₂ /Carbon are prepared. The ${V} _{\textit {oc}}$ and FF of the carbon-based, HTL-free and all-inorganic PSCs with polyethyleneimine (PEI) incorporating have an obvious improvement, and the champion device can get an efficiency of 7.5% with peak ${V} _{\textit {oc}}$ of 1.2 V and maximum FF of 65%, which is far beyond the one without PEI incorporating. Our work hopes to give an effective method to produce a simple, cost-effective design for PSCs.

中文翻译：

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通过掺入聚乙烯亚胺的偶极调节来改善全无机，无空穴传输层的钙钛矿型太阳能电池的性能

在钙钛矿太阳能电池（PSC）的发展日新月异的情况下，全无机PSC，尤其是富含Br的全无机PSC，不仅继承了带隙可调，光吸收性能优异的优点，而且还具有出色的稳定性。为了找到一种简单，低成本的方法来提高钙钛矿的性能，我们尝试借助PEI引入的偶极子来调节CsPbIBr ₂的导带 。此外，我们使用碳作为负极来放弃贵金属和空穴传输层（HTL）。最后，制备了具有氟掺杂氧化锡（FTO）/ TiO ₂ / CsPbIBr ₂ /碳结构的太阳能电池 。这 $ {V} _ {\ textit {oc}} $ 和 FF 掺有聚乙烯亚胺（PEI）的碳基，无HTL和全无机PSC的性能有明显改善，冠军设备的峰值效率为7.5％ $ {V} _ {\ textit {oc}} $ 最大1.2 V FF占65％，远远超过没有加入PEI的国家。我们的工作希望提供一种有效的方法来为PSC制作简单，具有成本效益的设计。