[16p-Z31-1~18] 17.2 Graphene

△ [16p-Z31-4] Graphene photodetectors with asymmetric structures for macroscopic visible and infrared light detection

〇Kenta Shimomura¹, Kaname Imai¹, Akira Kawai², Kazuki Hashimoto², Takuro Ideguchi^2,3, Kenta Nakagawa^1,4, Hideyuki Maki^1,5 (1.KeioUniv., 2.UTokyo, 3.PRESTO, 4.KISTEC, 5.Keio Spintronics Research Center)

Keywords:graphene, photodetector, asymmetric structure

Since the polarities of the photovoltages at each graphene/electrode interface are opposite, they are canceled out under macroscopic light irradiation to the photodetectors. In this study, we propose two graphene-based photodetectors with different asymmetric device structures that can suppress the cancelation of photovoltage at the two interfaces. We demonstrated macroscopic light detection by the photodetectors in the visible, near-infrared, and mid-infrared regions by suppressing the photovoltage cancelation.