Solution-processed flexible MAPbI₃ photodetectors with ZnO Schottky contacts

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite photodetectors offer high detectivity and fast response times.
• Mechanical flexibility is crucial for next-generation flexible electronics.
• Existing fabrication methods often require high temperatures, limiting flexibility.

Purpose of the Study:

• To fabricate a low-temperature processed, flexible perovskite photodetector.
• To investigate the performance and stability of the fabricated device.
• To explore the potential of ALD-fabricated Schottky contacts for photodetectors.

Main Methods:

• Fabrication of a flexible photodetector using a low-temperature process.
• Utilizing Atomic Layer Deposition (ALD) for ITO-ZnO Schottky contact formation.
• Characterization of device performance under varying conditions, including bending stress.

Main Results:

• Achieved a significant reduction in dark current from 2.04×10^-8 A/cm² to 1.70×10^-9 A/cm² at -0.5 V.
• Demonstrated high detectivity (6.19×10¹² Jones) and a large dynamic range (LDR) of 103 dB with 530 nm laser irradiation.
• Exhibited excellent mechanical and bending stability, retaining performance after 5000 bending cycles.

Conclusions:

• Low-temperature ALD fabrication enables high-performance, flexible perovskite photodetectors.
• The ITO-ZnO Schottky contact contributes to reduced dark current and enhanced device characteristics.
• These flexible photodetectors show great promise for advanced optoelectronic applications requiring durability and sensitivity.