Hot Carriers in CVD-Grown Graphene Device with a Top h-BN Layer
Journal
Journal of Nanomaterials
Journal Volume
2018
Date Issued
2018
Author(s)
Chuang, C.
Mineharu, M.
Matsumoto, N.
Matsunaga, M.
Liu, C.-W.
Wu, B.-Y.
Kim, G.-H.
Lin, L.-H.
Ochiai, Y.
Watanabe, K.
Taniguchi, T.
Aoki, N.
Abstract
We investigate the energy relaxation of hot carriers in a CVD-grown graphene device with a top h -BN layer by driving the devices into the nonequilibrium regime. By using the magnetic field dependent conductance fluctuations of our graphene device as a self-thermometer, we can determine the effective carrier temperature Te at various driving currents I while keeping the lattice temperature TL fixed. Interestingly, it is found that Te is proportional to I , indicating little electron-phonon scattering in our device. Furthermore the average rate of energy loss per carrier Pe is proportional to (Te 2-TL 2), suggesting the heat diffusion rather than acoustic phonon processes in our system. The long energy relaxation times due to the weak electron-phonon coupling in CVD graphene capped with h-BN layer as well as in exfoliated multilayer graphene can find applications in hot carrier graphene-based devices.
SDGs
Type
journal article