Breaking the Limit of Grain Boundaries in Perovskite Photodetection by High-Pressure Treatment

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-05-01 DOI:10.1021/acs.nanolett.5c01543

Yanfeng Yin, Hui Luo, Na Ta, Hongli Xuan, Xujie Lü, Shengye Jin, Wenming Tian

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Abstract

Grain boundaries (GBs) in polycrystalline metal halide perovskite (MHP) films hinder charge transport, limiting the optoelectronic device efficiency. Therefore, optimizing GBs and enhancing intergrain carrier transport is crucial for improving optoelectronic performance, especially in lateral-structure devices such as photoconductors, phototransistors, and photodetectors. Hydrostatic pressure provides a new dimension for tuning the structures and properties of halide perovskites. Here we report permanent structural changes, specifically recrystallization at GBs, and performance improvement of (FAPbI₃)_0.95(MAPbBr₃)_0.05 perovskite polycrystalline films by sustaining it under a mild pressure of 1.8 GPa for 12 h. The treated film, after being released to ambient conditions, exhibits a huge enhancement in carrier diffusivity by ∼5 times and photoresponsivity by ∼8 times. These notable enhancements are attributed to improved intergrain carrier transport facilitated by pressure-induced recrystallization at the GBs. These results imply that pressure treatment is a promising method for enhancing the optoelectronic performance of perovskite devices.

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高压处理钙钛矿光探测中突破晶界限制的研究

多晶金属卤化物钙钛矿（MHP）薄膜中的晶界阻碍了电荷输运，限制了光电器件的效率。因此，优化GBs和增强晶间载流子输运对于提高光电性能至关重要，特别是在光导体、光电晶体管和光电探测器等横向结构器件中。静水压力为调整卤化钙钛矿的结构和性能提供了一个新的维度。在这里，我们报告了永久性的结构变化，特别是在gb下的再结晶，以及（FAPbI3）0.95(MAPbBr3)0.05钙钛矿多晶薄膜的性能改善，通过在1.8 GPa的温和压力下维持12小时。处理后的薄膜在释放到环境条件后，载流子扩散率提高了约5倍，光响应性提高了约8倍。这些显著的增强是由于在GBs处压力诱导的再结晶促进了晶粒间载流子输运。这些结果表明，压力处理是提高钙钛矿器件光电性能的一种很有前途的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.