Interfacial coupling enabled strong, asymmetric, and tunable thermoelectricity at graphene/MoS2 heterostructures
Abstract
A comprehensive understanding of interfacial physics including electron/phonon transport and coupling at graphene/MoS2 heterojunctions is critical for thermoelectric conversion and sensing, yet remains insufficiently explored. Here, we comprehensively investigate its electrical transport, thermal transport, and thermoelectric properties using a well-designed micro-heater device and a photo-thermal Raman technique. Electrical transport measurements reveal opposite resistance dependence on gate voltage in individual MoS2 and graphene/MoS2 regions, based on which a low-voltage 0–1 logic device is demonstrated. The graphene/MoS2 heterojunction exhibits strong (maximum 1.03 mV/K in our experiment) and asymmetric thermoelectric characteristics, which are attributed to a synergistic mechanism involving interface energy filtering and graphene-doping. The thermoelectric response can be effectively tuned through modulation of interfacial Schottky barrier and electrical coupling. Additionally, we observe electrically tunable interfacial thermal conductance at the interface, which may arise from combined phonon coupling and electron–phonon interaction. Our study provides a promising platform for developing intelligent thermoelectric devices applications.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (10)
Mingshun Qi
Center on Nanoenergy Research, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University 1 , Nanning 530004,
Xu Han
Yongpeng Wu
Center on Nanoenergy Research, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University 1 , Nanning 530004,
Jinkai Huo
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology 2 , Dalian 116024,
Haichao Pan
Center on Nanoenergy Research, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University 1 , Nanning 530004,
Xing Li
Interdisciplinary Science Center, State Key Laboratory of Animal Biodiversity Conservation and Integrated Pest Management, Institute of Zoology
Wenjie Sun
Wenyuan Qiu
Center on Nanoenergy Research, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University 1 , Nanning 530004,
Dawei Li
Chenghao Deng
Center on Nanoenergy Research, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University 1 , Nanning 530004,