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Endogenous Intermediate Template Guided Crystallization for High Performance FAPbCl3 UV Detector.

Hansheng Li1,2, Xuan Wang1, Mingyu Ma3

  • 1College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha, 410073, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 3, 2025
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Summary
This summary is machine-generated.

This study introduces a new method to improve lead-chloride perovskite films for UV detectors. The technique enhances film quality, leading to better device performance and a novel UV detector array.

Keywords:
crystallization templatehydrogen bondintermediate phaseoriented growthperovskite UV detectorperovskite UV imaging sensorprecursor coordination adduct

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Lead-chloride perovskites show promise for UV detectors but suffer from poor film quality due to chloride's ionic nature.
  • Forming stable ligand-lead adducts to guide perovskite crystallization is challenging, hindering device performance.

Purpose of the Study:

  • To develop a strategy for guiding the crystallization of lead-chloride perovskite (FAPbCl3) for improved UV detector applications.
  • To overcome the limitations of poor film quality and device performance in lead-chloride perovskite UV detectors.

Main Methods:

  • An endogenous intermediate template strategy utilizing hydrogen bond enrichment between ligands was employed.
  • A low-dimensional N-Pb-O adduct (FAPbCl3-DMSO) was observed in the precursor liquid, acting as an in-situ crystallization template.
  • The strategy guided the oriented growth of FAPbCl3 perovskite films, resulting in large, closely packed grains.

Main Results:

  • The developed method led to perovskite films with significantly enhanced photoluminescence (PL) intensity and reduced defect density.
  • A self-driven lead-chloride perovskite UV detector was fabricated, demonstrating high responsivity (0.63 A W⁻¹), detectivity (1.3 × 10¹³ Jones), and fast response times (205/53 µs at 365 nm).
  • For the first time, a uniform 64 × 64 lead-chloride perovskite UV array detector was successfully fabricated, showcasing promising image sensing capabilities.

Conclusions:

  • The endogenous intermediate template strategy effectively guides the crystallization of lead-chloride perovskite, leading to superior film quality and device performance.
  • This approach enables the fabrication of high-performance lead-chloride perovskite UV detectors and opens possibilities for advanced UV imaging applications.
  • The study highlights a significant advancement in perovskite materials for optoelectronic devices, particularly in the realm of UV detection and imaging.