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Summary For the development of the perovskite formation process, it is necessary to explore the principle of fabricating the photosensitive layer. Herein, a novel perspective on the physical properties of anti‐solvents is proposed, which is related to perovskite crystallization. Specifically, we focus on aromatic solvents with different functional groups as anti‐solvents (methylbenzene (MB) and chlorobenzene (CB)). This is because the precursor solubility depends on the interactions with each solvent, which is closely observed via FT‐IR. In this context, the interfacial affinity of thin perovskite layer induced uniform morphology of electron transport layer (ETL). This phenomenon is characterized by FE‐SEM, AFM, and XRD in detail. Based on these data, CB‐treated perovskite photodetector exhibits superior detectivity and fast response speed owing to better interfacial affinity between perovskite and ETL. Also, improved charge dynamic behavior (dark current and impedance analysis) was observed in CB‐treated condition. Therefore, it is demonstrated that the selection of anti‐solvent is important to optimize morphological affinity between perovskite and interlayer in fabricating thin photosensitive layer, which contributes to realization of fast and highly sensitive photodetector.

The synthesis of perovskite-based blue lightemitting particles is valuable for several applications as the excellent optical properties and performances of the constituting materials associated with multi-exciton generation can be exploited. However, the preparation of perovskite precursors requires high temperatures, resulting in a complex manufacturing process. This paper proposes a one-pot method to synthesize CsPbClBr 2 blue light-emitting quantum dots (QDs). In the case of nonstoichiometric precursor synthesis, the CsPbClBr 2 QDs coexisted with additional products. The solvent for synthesizing mixed perovskite nanoparticles (containing chloride) was selected by mixing dimethylformamide (DMF) and/or dimethyl sulfoxide (DMSO) in different ratios. When only DMF was used with the stoichiometric CsBr and PbX 2 (X = Cl, Br) ratio, the quantum yield was 70.55%, and superior optical properties were achieved. Moreover, no discoloration was observed for 400 h, and a high photoluminescence intensity was maintained. When deionized water was added to form a double layer with hexane, the luminescence was maintained for 15 days. In other words, the perovskite did not easily decompose even when in contact with water, which suppressed the release of Pb 2+ , which are heavy metal atoms in the structure. Overall, the proposed one-pot method for all-inorganic-based perovskite QDs provides a platform for synthesizing superior blue light-emitting materials.

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