Investigation of thermal transport in 2-Dimensional Van der Waals Materials

Abstract

Van der waals materials are receiving much interest due to its two dimensional nature and availability to make heterostructures and quasicrystals. TMPS3 (TM=Fe, Ni, Mn) group, which is antiferromagnetic vdW materials, can act as magnetic candidate for studying 2-dimensional physics. In this work, we measured the anisotropic thermal conductivity of TMPS3 materials with beam size dependent time-domain thermoreflectance method. Out-of-plane thermal conductivity of TMPS3 materials displays significantly low value when compared to graphene and TMD, and the thermal conductivity increased in the order of TMPS3, TMD and graphite. By examining the temperature–dependence, we conclude that effective boundary caused by stacking fault of van der Waals layer act as main scattering channel in out-of-plane thermal conduction in van der Waals materials we investigated. In plane thermal conductivity of TMPS3 at 300 K is similar with TMD material which shows highly anisotropic behavior. We measured thermal conductance of 2 to 13 layer MnPS3 which is lying between metal and SiO2 substrate. Layer dependent thermal conductance of MnPS3 shows constant increase in 2 to more than 10 layers which is contradicting with the understandings from other van der Waals materials.