Continuous Tuning of Fermi-level in Disorder Engineered Films for Thermoelectric Applications
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This talk will address the tuning of Fermi-level in the electronic structure and the optimization of thermoelectric(TE) properties based on semi-conducting materials. (i.e., reduced graphene oxide(rGO), tungsten disulfide, molybdenum disulfide(MoS2), zinc oxide and their composites, conjugated polymers) Their electrical and TE properties was studied depending on their molecular structures by organic electrochemical transistor (OECT) system with a micro-heater to create a temperature gradient across the film. These energy-dependent TE characteristics can be guidance for the design of efficient TE materials. We confirmed the correlation between charge transport and molecular structures experimentally using the OECT method and proved an in-situ measurement system by adjusting the EF, in a semi-crystalline material. It provides the strategies for molecular design for efficient electronic or TE materials via tuning their charge generation and transport.