Recent advances of interface engineering in inverted perovskite solar cells

Perovskite solar cells (PSCs) have witnessed great achievement in the past decade. Most of previous researches focus on the n–i–p structure of PSCs with ultra-high efficiency. While the n–i–p devices usually used the unstable charge transport layers, such as the hygroscopic doped spiro-OMeTAD, which affect the long-term stability. The inverted device with the p–i–n structure owns better stability when using stable undoped organic molecular or metal oxide materials. There are significant progresses in inverted PSCs, most of them related to charge transport or interface engineering. In this review, we will mainly summarize the inverted PSCs progresses related to the interface engineering. After that, we prospect the future direction on inverted PSCs.