Sensitive and Robust Ultraviolet Photodetector Array Based on Self-Assembled Graphene/C

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Graphene shows promise for photodetectors due to its high carrier mobility and broad absorption.
• Challenges exist in fabricating stable, large-scale graphene-based ultraviolet (UV) photodetectors.

Purpose of the Study:

• To synthesize a scalable, all-carbon hybrid film for high-performance UV photodetectors.
• To overcome the limitations of existing graphene-based UV photodetector technologies.

Main Methods:

• Utilized graphene as a template for C60 assembly to create an all-carbon hybrid film.
• Investigated the film's UV absorption, photoconductive gain, and response time modulation.
• Fabricated and tested a 5x5 photodetector array to assess scalability and stability.

Main Results:

• Achieved strong and tunable UV absorption with a photoresponsivity of approximately 10^7 A/W.
• Demonstrated gate voltage modulation of response time via electron-hole recombination.
• Exhibited negligible degradation over two months, showcasing excellent environmental robustness.

Conclusions:

• The all-carbon hybrid film offers high responsivity, reliability, and scalable processability.
• This material is a promising candidate for future integrable optoelectronics.
• The developed material addresses key challenges in UV photodetector fabrication and stability.