[8p-PB3-1~46] 17 Nanocarbon and Two-Dimensional Materials (Poster)

[8p-PB3-35] Photothermoelectric response in twisted bilayer graphene at the telecommunications wavelength

〇Junsei Ayusawa^1,2, Yuma Yoshinaga^1,2, Ikumo Itadani^1,2, Daichi Kozawa¹, Ryo Kitaura¹, Kenji Watanabe¹, Takashi Taniguchi¹, Satoshi Moriyama^1,2, Takuya Iwasaki¹ (1.NIMS, 2.Tokyo Denki Univ.)

Keywords:

Twisted bilayer graphene,Near-infrared photoresponse,Photodetector

To achieve high-sensitivity and high-speed photodetection, we fabricated twisted bilayer graphene with a controlled twist angle and investigated its near-infrared photoresponse characteristics at the telecommunications wavelength of 1550 nm. Zero-bias photocurrent mapping revealed a pronounced photoresponse localized at the graphene-electrode interfaces. Furthermore, the sign of the photocurrent was found to reverse upon varying the gate voltage. The results indicate that the photothermoelectric effect is the dominant mechanism governing the photoresponse in our device.