2024/03/01 by Takuya Iwasaki, Yodai Sato, Makoto Ogo +7
Materials Science · #2D Materials and Applications #Graphene research and applications #Thermal properties of materials #graphene/hBN heterostructure #photo-thermoelectric effect #photodetector
paper · doi:10.48505/nims.5232
openalex publication_date 2024/03/01 · openalex created_date 2026/04/01 · openalex updated_date 2026/06/22
We report on the photodetection properties of high-quality graphene encapsulated by hexagonal boron nitride under illumination with optical communication light. We demonstrate a gate-tunable photocurrent and zero-bias switching cycle operation at room temperature. Through gate- and temperature-dependent photocurrent measurements, we determine that the dominant photoresponse mechanism is the photo-thermoelectric effect. At low temperatures, the photocurrent in finite doping regions correlates with the Seebeck coefficient, while sharp peaks emerge near the charge neutrality point due to an edge-excited photocurrent. Our study provides guidelines for high-performance graphene-based optoelectronic devices.