High-performance stretchable photodetector based on CH₃NH₃PbI₃ microwires and graphene

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Development of flexible and stretchable photodetectors is crucial for advanced electronic applications.
• Perovskite materials offer excellent optoelectronic properties but often lack mechanical stability.
• Graphene's unique electronic properties can enhance charge transport in optoelectronic devices.

Purpose of the Study:

• To fabricate a highly stretchable photodetector with maintained performance.
• To investigate the role of perovskite microwires and graphene in device performance under strain.
• To evaluate the stability and photoresponse characteristics of the stretchable photodetector.

Main Methods:

• Fabrication of a stretchable photodetector using prestrained VHB substrate coated with perovskite CH3NH3PbI3 microwires and graphene.
• Synthesis of CH3NH3PbI3 microwires from bulk single crystals.
• Characterization of device performance, including responsivity and photoresponse, under various strain levels and laser illumination.

Main Results:

• The stretchable photodetector achieved a responsivity of 2.2 mA W-1 under low bias and irradiance.
• Responsivity was maintained at 0.96, 0.60, and 0.21 mA W-1 at 30%, 50%, and 80% strain, respectively.
• The device exhibited a fast photoresponse (<0.12 s) even after 100% stretching and demonstrated good stability over 100 stretching cycles.

Conclusions:

• The developed stretchable photodetector demonstrates excellent mechanical flexibility and robust optoelectronic performance.
• The integration of perovskite microwires and graphene is effective for achieving high-performance stretchable photodetectors.
• This work paves the way for novel applications in wearable and flexible electronic systems.