All‐Inorganic Halide Perovskites for Optoelectronics: Progress and Prospects

Abstract

During the past 8 years, solution‐processed organic–inorganic metal halide (OMH) perovskites have become some of the most notable materials because they can exhibit high solar cell efficiency, exceeding 20%. However, due to the volatile and hygroscopic nature of the organic cations, OMH perovskites suffer from chemical instability, especially at high temperatures. Therefore, all‐inorganic metal halide (IMH) perovskites (CsBX3, B = Pb, Sn, Ge; X = Cl, Br, I) are rapidly emerging as promising alternatives because of their superior stabilities and comparable properties, such as strong emission, high fluorescence quantum yield and tunable bandgap covering entire visible spectrum. Highlighted by these advantages, IMH perovskites have attracted enormous attention, indicating a promising future. In this review, the recent progress on the syntheses of IMH perovskites is outlined. In addition, the research development of IMH perovskites in optoelectronic devices, such as perovskite solar cells, photodetectors, and light‐emitting diodes, is introduced. Finally, the challenges facing the field of IMH perovskites are discussed and some possible solutions based on the available literature are suggested.

Recent Progress of All‐Bromide Inorganic Perovskite Solar Cells

“…The loss of the open circuit voltage of ≈18% indicates that the energy‐level alignment can be further improved. One of the advantages of the CsPbBr 3 bandgap is the application in multijunction solar cells with PSCs, silicon solar cells, or CIGS solar cells . Another outstanding property of CsPbBr 3 is the high V oc that can minimize the number of serial connections when considering solar module design.…”

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr2 Perovskite Solar Cells

“…Amongt hem, CsPbBr 3 offers good phase stability,b ut has an intrinsically wideb and gap of % 2.3 eV that confines its absorption edge to % 540 nm, [4,8,11] limiting its use toward high-PCE cells. [7,9,12,17] Although av ariety of strategies,i ncluding refined grains, [18] doping, [19] or surfacet ermination modifications, [20,21] provedu seful fors tabilizing the desired perovskite a phase, their stability is still not satisfactory. [7,9,12,17] Although av ariety of strategies,i ncluding refined grains, [18] doping, [19] or surfacet ermination modifications, [20,21] provedu seful fors tabilizing the desired perovskite a phase, their stability is still not satisfactory.…”

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.…”