What is it about?

In this work, we report the first experimental observation of transfer of heat between 2 layers of a hybrid 2D material-based structure. The 2 layers, in this case, are graphene and tungsten disulfide. Further, the tunability of this heat transfer has been studied to understand the origin of this mechanism, and how this mechanism can be exploited to create a new class of ultrafast and highly sensitive bolometers.

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Why is it important?

2D material-based hybrids are known to be efficient photodetectors and quantum sensors. To increase the efficiency of such detectors, it is imperative that we fully understand the mechanism of photodetection in such detectors. Heat transfer between these 2D layers in a graphene-tungsten disulfide heterostructure has never been employed to achieve photodetection. Our work has implemented this technique demonstrating the use if this hybrid structure as a bolometer. Further, it sheds light on the relative importance of charge transfer and energy transfer channels for the distribution of optical energy when such hybrids are illuminated with light.

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This page is a summary of: Probing the charge and heat transfer channels in optically excited graphene — transition metal dichalcogenide hybrids using Johnson noise thermometry, Applied Physics Letters, July 2022, American Institute of Physics, DOI: 10.1063/5.0099383.
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