Phys. org January 4, 2023
A team of researchers in the US (SLAC National Accelerator Laboratory, Stanford University, UC Berkeley) studied devices consisting of stacked monolayers of WSe2 and WS2. They found that the WSe2 layer heated up, as expected, and the WS2 layer also heated up in tandem, suggesting a rapid transfer of heat between layers. By contrast, when they didn’t excite electrons in the WSe2 and heated the heterostructure using a metal contact layer instead, the interface between WSe2 and WS2 transmitted heat very poorly, confirming previous reports. It was surprising to see the two layers heat up almost simultaneously after photoexcitation. After extensive calculations they concluded that the electrons were serving as bridges to heat dissipation. According to the researchers if we can understand and control that, it offers a unique approach to thermal management in semiconductor devices…read more. TECHNICAL ARTICLE
Phonon thermal transport across a monolayer WSe2/WS2 heterojunction. Credit: Nature Nanotechnology (2022)Â