Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/120567
Title: THERMAL AND PHOTOELECTRIC TRANSPORT IN NOVEL TWO-DIMENSIONAL MATERIALS
Authors: WU JING
Keywords: thermal conductivity, thermoelectric, ZT, photoelectric, temperature dependent, two-dimensional materials
Issue Date: 22-Jan-2015
Citation: WU JING (2015-01-22). THERMAL AND PHOTOELECTRIC TRANSPORT IN NOVEL TWO-DIMENSIONAL MATERIALS. ScholarBank@NUS Repository.
Abstract: Thermoelectric and photoelectric effects can provide sustainable energy harvested from the environment. Such environmentally friendly energy sources are considered to be the most promising renewable energy for solving the future energy shortage. With the inspiration of the outstanding properties of novel two-dimensional (2D) materials, we study the thermal and photoelectric transport of few 2D materials. I start with the study of thermal conductivity in suspended single layer graphene. Thermal conductivity has been observed to increase with the length (L) of the samples and to scale as ~ log L, which is size independent for bulk materials. Compare with zero bandgap graphene, the results of the study for more general 2D materials with bandgap are more promising in material science. We study the thermoelectric transport of MoS2 and the photoelectric transport of black phosphorus in this thesis. High tenable value of thermopower was demonstrated in MoS2. From the great enhancement at low carrier density region and the shift with the temperature, we found that at low carrier densities, transport is dominated by the variable-range hopping. In black phosphorus side, we demonstrate that black phosphorus can be an excellent ultraviolet (UV) photodetector. Exceptional photo responsivity in the UV range has been observed. We attribute such a colossal UV photo responsivity to the resonant-interband transition between two specially nested valence and conduction bands. Our study here should have important implications for future energy harvesting applications.
URI: http://scholarbank.nus.edu.sg/handle/10635/120567
Appears in Collections:Ph.D Theses (Open)

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