INORGANIC/ORGANIC HYBRID SUPERLATTICE FILMS TOWARD NEXT-GENERATION FLEXIBLE/WEARABLE THERMOELECTRIC DEVICES

摘要

Liquid exfoliation has proven to be a scalable and versatile technique to produce large-scale two-dimensional (2D) nanosheets among graphene, boron nitrides, layered perovskites and transition metal dichalcogenides. This also provides new insights into the assembly of multilayer heterostructures for novel functionalities. Here we present a solution-processed method to fabricate 2D inorganic/organic superlattice film for thermal energy harvesting, which can be either freestanding or be deposited onto substrates. The organic layer provides charge carriers to the inorganic layer, suppresses the overall thermal conductivity, and allows the material to be flexible. We have fabricated a thermoelectric module, which can generate a high power density of 2.5 W/m~2 at a temperature gradient of 70K, hitting new record among the organic-based flexible thermoelectric devices. Flexibility of our newly developed superlattice materials combined with organic TE materials would enable us to design various types of TE modules that cannot be realized by using conventional hard and stiff inorganic materials. Our newly designed TE modules will be demonstrated to be useful for energy harvesting in the future IoT society.