Aligning Out-of-Plane Polarization in 2D Ferroelectric Perovskite Wafer Boosts Interlayer Carrier Transport for Efficient X-Ray Detection

IF 36.3 1区材料科学 Q1 Engineering

Nano-Micro Letters Pub Date : 2026-10-15 DOI:10.1007/s40820-026-02352-z

Chenhao Deng, Shihai You, Haiqing Zhong, Xiankan Zeng, Xiaolong Hao, Jiasheng Xie, Zheng Zhou, Zhangjian Jin, Huang Ye, Lijun Xu, Jianbo Wu, Panpan Dong, Wen Li, Xingxing Jiao, Weiqing Yang

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引用次数: 0

Abstract

Hightlights

High-quality, centimeter-sized polycrystalline wafers of a 2D ferroelectric perovskite are fabricated via a facile hot-pressing method, circumventing the challenge of growing large, thick single crystals of 2D perovskites.
The preferred horizontal orientation of grains, combined with electric poling, creates macroscopic out-of-plane polarization, generating a strong built-in electric field that boosts interlayer carrier transport.
The poled wafer not only enables self-powered X-ray detection but also achieves a high sensitivity (2285 μC Gy⁻¹ cm⁻²) and an ultralow detection limit (7.2 nGy s⁻¹) under a small bias, along with exceptional operational stability and high-contrast X-ray imaging.

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对准二维铁电钙钛矿晶圆的面外偏振增强层间载流子输运，用于高效x射线探测。

二维金属卤化物钙钛矿（MHPs）具有抑制离子迁移和增强结构稳定性的特点，在x射线直接检测中具有很大的应用前景，但存在层间载流子传输差和单晶难以标化的问题。在这里，我们克服了这些限制，通过简单的热压策略，制造出具有面外自发极化（Mpda）PbBr4 （Mpda = n -甲基-1,3-丙二胺）的高质量，厘米尺寸的二维铁电MHP多晶片。这个过程诱导微晶的水平取向，导致它们的极轴垂直排列，从而在晶圆中产生宏观极化。这种有趣的极化产生了一个可切换的内置电场，可以促进光生载流子的分离和层间输运，显示出高达2 V的体光电压。因此，垂直x射线探测器不仅可以在自供电模式下工作，而且可以在小偏压（16 V）下实现2285 μC Gy-1 cm-2的高灵敏度和7.2 nGy s-1的超低检测限。该设备还具有卓越的操作稳定性和高分辨率x射线成像能力。这项工作表明，调整多晶片中的本征铁电极化是增强垂直载流子传输的可行策略，为基于二维MHPs的高性能平板x射线探测器铺平了道路。

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-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

32.60

自引率

4.90%

发文量

981

审稿时长

1.1 months

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.