Self-powered deep-ultraviolet photodetector based on a perovskite/oxide heterojunction

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Deep-ultraviolet (DUV) photodetectors are crucial for various applications, offering efficient light detection without external power.
• The development of self-powered DUV photodetectors is a key area of research for enhanced performance and versatility.

Purpose of the Study:

• To propose and fabricate a novel self-powered deep-ultraviolet photodetector.
• To investigate the optoelectronic properties of a p-Cs3Cu2I5/n-ZnGa2O4 heterojunction for DUV detection.

Main Methods:

• Fabrication of a p-Cs3Cu2I5/n-ZnGa2O4 heterojunction using pulsed laser deposition.
• Characterization of the photodetector's performance under deep-ultraviolet illumination (260 nm).
• Evaluation of key parameters including responsivity, specific detectivity, response time, and recovery time.

Main Results:

• The fabricated photodetector demonstrated self-powered characteristics under 0 V bias.
• Maximum responsivity reached 1.2 mA/W and specific detectivity was 1.65 × 10^11 Jones at 260 nm.
• Response and recovery times were measured at 410 ms and 114 ms, respectively.
• Detection capabilities were confirmed in the wavelength range of 255–330 nm.

Conclusions:

• The p-Cs3Cu2I5/n-ZnGa2O4 heterojunction photodetector exhibits promising self-powered DUV detection capabilities.
• The device's performance metrics indicate its potential for advanced applications in civil and military fields.
• This work contributes to the advancement of self-powered photodetector technology for deep-ultraviolet sensing.