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Enhanced Optoelectronic Performance Induced by Ion Migration in Lead-Free CsCu₂I₃ Single-Crystal Microrods.

Shan-Shan Yan^1,2, You-Chao Kong¹, Zhi-Hong Zhang^1,3

¹Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau999078, China.

ACS Applied Materials & Interfaces

|October 31, 2022

Summary

Lead-free perovskite photodetectors using CsCu2I3 single crystals show enhanced performance. Ion migration in these devices improves the on/off ratio, demonstrating potential for stable and efficient photodetection applications.

Keywords:

CsCu2I3 ion migration lead-free perovskite photodetector

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Area of Science:

Materials Science
Optoelectronics

Background:

Lead-free perovskites offer stable and non-toxic alternatives for optoelectronic devices.
Ion migration is a known phenomenon in perovskites, but its performance-enhancing potential is underexplored.

Purpose of the Study:

To investigate the impact of ion migration on carrier transport in lead-free CsCu2I3 single-crystal photodetectors.
To explore the use of ion migration to enhance photodetector performance, specifically the on/off ratio.

Main Methods:

Synthesis of CsCu2I3 single-crystal microrods using in-plane self-assembly supersaturated crystallization.
Fabrication of ultraviolet (UV)-band photodetectors using the synthesized microrods.
Surface potential profiling using Kelvin probe force microscopy (KPFM) to analyze band bending.

Main Results:

CsCu2I3 single-crystal microrod photodetectors demonstrated superior performance compared to other lead-free perovskite devices.
Recoverable ion migration was found to enhance the photodetector's on/off ratio by nearly an order of magnitude.
Ion migration induced asymmetric band bending, contributing to improved device characteristics.
The CsCu2I3 single crystal exhibited excellent thermal and air stability.

Conclusions:

Lead-free CsCu2I3 single-crystal microrods are suitable for stable and efficient photodetection.
Harnessing ion migration effects can significantly improve the optoelectronic performance of lead-free perovskite devices.