Acoustic phonon recycling for photocarrier generation in graphene-WS2 heterostructures

Ke Wei, Yizhen Sui, Zhongjie Xu, Yan Kang, Jie You, Yuxiang Tang, Han Li, Yating Ma, Hao Ouyang, Xin Zheng, Xiangai Cheng and Tian Jiang ()
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Ke Wei: National University of Defense Technology
Yizhen Sui: National University of Defense Technology
Zhongjie Xu: National University of Defense Technology
Yan Kang: National University of Defense Technology
Jie You: Academy of Military Sciences PLA China
Yuxiang Tang: National University of Defense Technology
Han Li: National University of Defense Technology
Yating Ma: National University of Defense Technology
Hao Ouyang: National University of Defense Technology
Xin Zheng: Academy of Military Sciences PLA China
Xiangai Cheng: National University of Defense Technology
Tian Jiang: National University of Defense Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Electron-phonon scattering is the key process limiting the efficiency of modern nanoelectronic and optoelectronic devices, in which most of the incident energy is converted to lattice heat and finally dissipates into the environment. Here, we report an acoustic phonon recycling process in graphene-WS2 heterostructures, which couples the heat generated in graphene back into the carrier distribution in WS2. This recycling process is experimentally recorded by spectrally resolved transient absorption microscopy under a wide range of pumping energies from 1.77 to 0.48 eV and is also theoretically described using an interfacial thermal transport model. The acoustic phonon recycling process has a relatively slow characteristic time (>100 ps), which is beneficial for carrier extraction and distinct from the commonly found ultrafast hot carrier transfer (~1 ps) in graphene-WS2 heterostructures. The combination of phonon recycling and carrier transfer makes graphene-based heterostructures highly attractive for broadband high-efficiency electronic and optoelectronic applications.

Date: 2020
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DOI: 10.1038/s41467-020-17728-x

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