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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
Summary
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.
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.
