Suppression of Phase Transitions in Perovskite Thin Films through Cryogenic Electron Beam Irradiation.
basic_science · Level V
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- Record sourced from PubMed, PMID 36098785.
- Also identified by DOI 10.1021/acs.nanolett.2c02368.
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Abstract
Organic-inorganic hybrid perovskites (OIHPs) with superior optoelectronic properties have emerged as revolutionary semiconductor materials for diverse applications. A fundamental understanding of the interplay between the microscopic molecular-level structure and the macroscopic optoelectronic properties is essential to boost device performance toward theoretical limits. Here, we reveal the critical role of CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> (MA) in the regulation of the physicochemical and optoelectronic properties of a MAPbI<sub>3</sub> film irradiated by an electron beam at 130 K. The order-to-disorder transformation of the MA cation not only leads to a notably enhanced photoluminescence emission but also results in the suppression of the orthorhombic phase down to 85 K. Taking advantage of the regulation of MA cation dynamics, we demonstrate a perovskite photodetector with 100% photocurrent enhancement and long-term stability exceeding one month. Our study provides a powerful tool for regulating the optoelectronic properties and stabilities of perovskites and highlights potential opportunities related to the organic cation in OIHPs.