All‐Inorganic CsPbX₃ Perovskite Solar Cells: Progress and Prospects

Abstract

Recently, lead halide‐based perovskites have become one of the hottest topics in photovoltaic research because of their excellent optoelectronic properties. Among them, organic‐inorganic hybrid perovskite solar cells (PSCs) have made very rapid progress with their power conversion efficiency (PCE) now at 23.7 %. However, the intrinsically unstable nature of these materials, particularly to moisture and heat, may be a problem for their long‐term stability. Replacing the fragile organic group with more robust inorganic Cs+ cations forms the cesium lead halide system (CsPbX3, X is halide) as all‐inorganic perovskites which are much more thermally stable and often more stable to other factors. From the first report in 2015 to now, the PCE of CsPbX3‐based PSCs has abruptly increased from 2.9 % to 17.1 % with much enhanced stability. In this Review, we summarize the field up to now, propose solutions in terms of development bottlenecks, and attempt to boost further research in CsPbX3 PSCs.

Controlled n‐Doping in Air‐Stable CsPbI2Br Perovskite Solar Cells with a Record Efficiency of 16.79%

“…Among all the inorganic perovskites, the mixed halide CsPbI 2 Br has attracted intensive attention due to its excellent thermal/light soaking stability and suitable direct bandgap, potentially in the front cell for perovskite‐silicon hybrid tandem applications 7. Numerous studies have been carried out regarding CsPbI 2 Br PSCs 8–12. The highest reported PCE of 16.58% has been achieved by using organic ammoniums to treat the surface of the CsPbI 2 Br film 13…”

Inorganic CsPbIBr2‐Based Perovskite Solar Cells: Fabrication Technique Modification and Efficiency Improvement

“…Although researchers have reviewed the advances of all‐inorganic CsX‐HPSCs several times, a brief summary of the devices based on CsPbIBr 2 is still scarce and pressing. Considering its rapid development and the great application prospect, we intend to provide a detailed overview and the deepgoing discussion by this work.…”

Recent Progress of All‐Bromide Inorganic Perovskite Solar Cells

“…Different from OIH‐PSCs, inorganic PSCs demonstrate excellent moisture and thermal stability by substituting the organic cations (MA + /FA + ) with inorganic ones (Cs + ) . There are three basic types, based on different halides, i.e., CsPbI 3 , CsPbBr 3 , and CsPbCl 3 .…”

“…There are three basic types, based on different halides, i.e., CsPbI 3 , CsPbBr 3 , and CsPbCl 3 . Detailed discussions about perovskite formation can be found in several review papers focusing on this topic . CsPbI 3 , as a representative of inorganic PSCs, has a suitable bandgap of ≈1.73 eV .…”