Millimeter-Sized Single-Crystal CsPbrB₃/CuI Heterojunction for High-Performance Self-Powered Photodetector

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Perovskite materials offer unique optoelectronic properties.
• Developing efficient and stable single-crystal perovskites is crucial for advanced devices.
• Self-powered photodetectors eliminate the need for external power sources.

Purpose of the Study:

• To synthesize millimeter-sized CsPbBr3 single crystals using a facile ambient method.
• To fabricate a CsPbBr3/CuI heterojunction for photodetector applications.
• To evaluate the self-powered performance characteristics of the fabricated photodetector.

Main Methods:

• Solvent-evaporation method for CsPbBr3 single crystal growth.
• Immersion process for creating p-type CuI/n-type CsPbBr3 heterojunction.
• Characterization of device rectifying behavior and optoelectronic properties under illumination.

Main Results:

• Millimeter-sized CsPbBr3 single crystals were successfully synthesized.
• The CsPbBr3/CuI heterojunction exhibited good rectifying behavior (ratio of 250 at ±2 V).
• The self-powered photodetector showed high photocurrent, photosensitivity (1.5 × 10^3), fast response (0.04/2.96 ms), and good detectivity (6.2 × 10^10 Jones).

Conclusions:

• A simple, low-cost method for producing millimeter-level CsPbBr3 single crystals was established.
• The fabricated CsPbBr3/CuI heterojunction photodetector demonstrates high performance.
• This work presents a promising approach for developing high-performance self-powered photodetectors.