在过去的3年中,全无机钙钛矿被认为是钙钛矿光伏领域最吸引人的研究热点之一,因为它们与有机-无机杂化对应物相比具有优异的热稳定性。功率转换效率已经达到17.06%,并且重要出版物的数量不断增加。这里,系统地强调了无机钙钛矿的进展,覆盖材料设计,制备高质量的钙钛矿薄膜,避免相位不稳定。无机钙钛矿,纳米晶体,量子点,讨论了无铅化合物,并综述了相应的器件性能,这已经在刚性和柔性基板上实现。强调了稳定低带隙无机钙钛矿立方相的方法,这是高效和稳定的太阳能电池的先决条件。此外,揭示了钙钛矿主体以及钙钛矿和电荷选择层界面处的能量损失机制。总结了减少这些电荷-载流子复合损失的报告方法,并通过我们方面提出的方法进行了补充。最后,评估了无机钙钛矿作为稳定吸收剂的潜力,这为无机钙钛矿太阳能电池的商业化开辟了新的前景。
All-inorganic perovskites are considered to be one of the most appealing research hotspots in the field of perovskite photovoltaics in the past 3 years due to their superior thermal stability compared to their organic-inorganic hybrid counterparts. The power-conversion efficiency has reached 17.06% and the number of important publications is ever increasing. Here, the progress of inorganic perovskites is systematically highlighted, covering materials design, preparation of high-quality perovskite films, and avoidance of phase instabilities. Inorganic perovskites, nanocrystals, quantum dots, and lead-free compounds are discussed and the corresponding device performances are reviewed, which have been realized on both rigid and flexible substrates. Methods for stabilization of the cubic phase of low-bandgap inorganic perovskites are emphasized, which is a prerequisite for highly efficient and stable solar cells. In addition, energy loss mechanisms both in the bulk of the perovskite and at the interfaces of perovskite and charge selective layers are unraveled. Reported approaches to reduce these charge-carrier recombination losses are summarized and complemented by methods proposed from our side. Finally, the potential of inorganic perovskites as stable absorbers is assessed, which opens up new perspectives toward the commercialization of inorganic perovskite solar cells.