Inorganic Halide Perovskite Solar Cells: Progress and Challenges

TL;DR: In this paper, the design principles of CPL-active organic nano-structures are expounded from the construction of micro-/nano-structure and the introduction of chirality.

TL;DR: In this article, a compositional engineering approach was introduced to tune the CsPbI2Br crystallization by directly incorporating iron (II) chloride (FeCl2) into perovskite precursor.

TL;DR: In this paper, the authors highlight various modes of converting ambient sources of energy into electricity using soft and stretchable materials, such as e-skins, bio-integrated wearables, and soft robotics.

Abstract: Inorganic CsPbI2Br perovskite solar cells (PSCs) have gained enormous research interest due to their excellent thermal and light stabilities. However, their unsatisfactory power‐conversion efficiency and poor intrinsic phase stability remain roadblocks to their further development. Herein, Cs2PbI2Cl2 nanosheets (NSs) with the Ruddlesden–Popper (RP) structure are synthesized, and an NSs/CsPbI2Br/NSs heterostructure is employed to enhance both the stability and efficiency of CsPbI2Br solar cells. The novel Cs2PbI2Cl2 NSs can not only passivate the top and bottom surfaces of the perovskite film and top surface of the TiO2 film but also enhance the stability of the perovskite film. Based on the heterostructured NSs/CsPbI2Br/NSs inorganic perovskite film, the efficiency of the CsPbI2Br PSCs is improved from 15.02% to 16.65%. Moreover, the unencapsulated CsPbI2Br devices with the NSs/CsPbI2Br/NSs heterostructure sustain over 90% of their original efficiencies after being exposed to ambient conditions (≈25 °C and ≈35% RH) for 648 h. Both the UV‐light‐soaking stability (100 mW cm−1 365 nm UV light) and thermal stability (T = 85 °C) of the optimized devices are dramatically improved in comparison with their counterparts with only a 3D active layer. Therefore, this work promotes the application of RP inorganic perovskite nanocrystals in a range of perovskite optoelectronic devices.

TL;DR: Petrozza and Ball as mentioned in this paper described the state of the art in the understanding of the origin and nature of defects in perovskite-halide light absorbers and their impact on carrier recombination, charge-transport, band alignment, and electrical instability.

TL;DR: It is shown that an all-inorganic version of the lead bromide perovskite material works equally well as the organic one, in particular generating the high open circuit voltages that are an important feature of these cells.

TL;DR: The synthesis of pure polymorphic crystals, the preparation of large crack-/bubble-free ingots, the refined single-crystal structures, and temperature-dependent charge transport and optical properties of CsSnI(3), coupled with ab initio first-principles density functional theory (DFT) calculations are described.

TL;DR: This study reports the successful fabrication of all-inorganic PSCs without any labile or expensive organic components, and opens the door for next-generation P SCs with long-term stability under harsh conditions, making practical application of Pscs a real possibility.