Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, and have emerged as promising candidates for high‐performance solar cells, light‐emitting diodes (LEDs), lasers, photodetectors, and radiation detectors. The impressive optical and optoelectronic properties, along with the rapid increase in efficiencies of solar cells and LEDs, have greatly attracted researchers across many disciplines. However, most advances made so far in terms of preparation (colloidal nanocrystals and thin films), and the devices with highest efficiencies are based on Pb‐based halide perovskites, which have raised concerns over their commercialization due to the toxicity of Pb. This has triggered the search for lower‐toxicity Pb‐free halide perovskites and has led to significant progress in the last few years. In this roadmap review, researchers of different expertise have joined together to summarize the latest progress, outstanding challenges, and future directions of Pb‐free halide perovskite thin films and nanocrystals, regarding their synthesis, optical spectroscopy, and optoelectronic devices, to guide the researchers currently working in this area as well as those that will join the field in the future.

Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospective

High-entropy halide perovskite single crystals stabilized by mild chemistry

Stabilizing CsPbI3 perovskite for photovoltaic applications

The poor interface quality between cesium lead triiodide (CsPbI3) perovskite and the electron transport layer limits the stability and efficiency of CsPbI3 perovskite solar cells (PSCs). Herein, a 4-amino-2,3,5,6-tetrafluorobenzoate cesium (ATFC) is designed as a bifacial defect passivator to tailor the perovskite/TiO2 interface. The comprehensive experiments demonstrate that ATFC can not only optimize the conductivity, electron mobility, and energy band structure of the TiO2 layer by passivation of the undercoordinated Ti4+, oxygen vacancy (VO), and free OH defects but also promote the yield of high-quality CsPbI3 film by synergistic passivation of undercoordinated Pb2+ defects with the CO group and F atom, and limiting I− migration via F···I interaction. Benefiting from the above interactions, the ATFC-modified CsPbI3 device yields a champion power conversion efficiency (PCE) of 21.11% and an excellent open-circuit voltage (VOC) of 1.24 V. Meanwhile, the optimized CsPbI3 PSC maintains 92.74% of its initial efficiency after aging 800 h in air atmosphere, and has almost no efficiency attenuation after tracking at maximum power point for 350 h. 

Highly‐Stable CsPbI3 Perovskite Solar Cells with an Efficiency of 21.11% via Fluorinated 4‐Amino‐Benzoate Cesium Bifacial Passivation

Photo-processing has been established as a powerful technique for the synthesis and structure modification of perovskites. In this review, the authors discuss the mechanisms of photo-processing of perovskites and summarize the recent progress in the photo-processing of perovskites for synthesis, patterning, ion exchange, phase transition, assembly, and ion migration and redistribution. The applications of photo-processed perovskites in photovoltaic devices, lasers, photodetectors, light-emitting diodes (LEDs)

https://www.oejournal.org/data/article/export-pdf?id=637dce8399d8814a1441b9d7

Photo-processing of perovskites: current research status and challenges

Laser-accelerated phase transformation in cesium lead iodide perovskite

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Laser-accelerated phase transformation in cesium lead iodide perovskite