Single Crystal Perovskite/Graphene Self-Driven Photodetector with Fast Response Speed

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Two-dimensional (2D) materials and perovskites are increasingly combined for optoelectronic devices due to their superior optical and electrical properties.
• Perovskite-based optoelectronics offer promising performance but require advanced material integration techniques.

Purpose of the Study:

• To develop a self-driven photodetector using a perovskite/2D material heterostructure.
• To investigate the performance characteristics of the fabricated photodetector, including response time and detectivity.
• To explore new methods for creating large-scale, high-quality perovskite/2D material heterostructures.

Main Methods:

• Fabrication of a photodetector using a monolayer graphene sheet and a centimeter-sized methylammonium lead bromide (CH3NH3PbBr3) single crystal.
• Utilized an optimized wet transfer method for material integration.
• Characterized the photodetector's performance under illumination at zero bias.

Main Results:

• Achieved a self-driven photodetector with a high-quality graphene/perovskite interface.
• Observed a rapid response time of 2/30 μs, attributed to enhanced electron-hole pair separation.
• Attained a responsivity of approximately 0.9 mA/W and a detectivity exceeding 10^10 Jones at zero bias.

Conclusions:

• The study demonstrates a novel self-driven photodetector based on perovskite and graphene.
• The optimized wet transfer method enables the creation of large-scale, high-quality heterostructures.
• This work offers a new pathway for enhancing the performance of future perovskite optoelectronic devices.