All-inorganic lead-free two-dimensional perovskite single crystal and preparation method and application thereof

By using N-ethyl-N-methylpiperidine iodide and a rapid-then-slow cooling crystallization technique, high-quality all-inorganic lead-free two-dimensional perovskite single crystals were prepared, solving the problems of growth controllability, surface roughness and defect density of lead-free perovskite materials, and improving the performance of detection devices.

CN121992500APending Publication Date: 2026-05-08CHANGSHA SEMICON TECH & APPL INNOVATION RES INST
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Patent Information

Application Number
CN202610203814.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-12
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing lead-free two-dimensional perovskite materials have problems with growth controllability, surface roughness and defect density, resulting in poor performance of detection devices, especially in X-ray and visible light detectors, where they exhibit low responsivity, slow speed and poor stability.

Method used

Using N-ethyl-N-methylpiperidine iodide as a surface passivating agent, combined with a rapid-then-slow cooling crystallization technique, seed crystals were introduced to control the crystallization process, thus preparing high-quality all-inorganic lead-free two-dimensional perovskite single crystals.

Benefits of technology

Large-size, low-defect-density, and smooth-surfaced perovskite single crystals were achieved, improving the sensitivity of X-ray detectors and the responsivity and speed of visible light dual-mode detectors, with performance significantly superior to traditional methods.

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Abstract

The invention relates to the technical field of photoelectric detectors and semiconductor materials, and particularly provides an all-inorganic lead-free two-dimensional perovskite single crystal as well as a preparation method and application thereof. According to the invention, N-ethyl-N-methylpiperidine iodized salt is introduced, and an improved cooling crystallization means of introducing a seed crystal is combined, so that the crystallization kinetics and the surface state of the lead-free two-dimensional perovskite are fundamentally changed; the problems of low crystal quality and poor X-ray detection and visible light detection device performance caused by poor growth controllability and multiple surface defects of the lead-free two-dimensional perovskite are solved. The obtained single crystal is large in size, low in defect density and smooth in surface, so that electrode contact and carrier extraction are facilitated. The performance of a detector based on the single crystal is greatly improved (the sensitivity of an X-ray detector reaches nearly 60000C. Gy <-1 >. Cm <-2 >, the responsivity of a visible light dual-mode detector exceeds 4000mA / W, and the response speed is within 1ms).
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