Asymmetric hot-carrier thermalization and broadband photoresponse in graphene-2D semiconductor lateral heterojunctions
Author(s)Lin, Yuxuan; Ma, Qiong; Shen, Pin-Chun; Ilyas, Batyr; Bie, Yaqing; Liao, Albert D.; Ergecen, Emre; Han, Bingnan; Mao, Nannan; Zhang, Xu; Ji, Xiang; Zhang, Yuhao; Yin, Jihao; Huang, Shengxi; Dresselhaus, Mildred; Gedik, Nuh; Jarillo-Herrero, Pablo; Ling, Xi; Kong, Jing; Palacios, Tomas; ... Show more Show less
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The massless Dirac electron transport in graphene has led to a variety of unique light-matter interaction phenomena, which promise many novel optoelectronic applications. Most of the effects are only accessible by breaking the spatial symmetry, through introducing edges, p-n junctions, or heterogeneous interfaces. The recent development of direct synthesis of lateral heterostructures offers new opportunities to achieve the desired asymmetry. As a proof of concept, we study the photothermoelectric effect in an asymmetric lateral heterojunction between the Dirac semimetallic monolayer graphene and the parabolic semiconducting monolayer MoS2. Very different hot-carrier cooling mechanisms on the graphene and the MoS2 sides allow us to resolve the asymmetric thermalization pathways of photoinduced hot carriers spatially with electrostatic gate tunability. We also demonstrate the potential of graphene-2D semiconductor lateral heterojunctions as broadband infrared photodetectors. The proposed structure shows an extreme in-plane asymmetry and provides a new platform to study light-matter interactions in low-dimensional systems.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Materials Research Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. Microsystems Technology Laboratories
American Association for the Advancement of Science (AAAS)
Yuxuan Lin et al. "Asymmetric hot-carrier thermalization and broadband photoresponse in graphene-2D semiconductor lateral heterojunctions." Science Advances 5, 6 (June 2019): eaav1493 © 2019 The Authors
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