Semiconductor-to-Metal Transition in Colloidal Nanocrystal Solids
발표자
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초록
내용
In this presentation, we report the semiconductor-to-metal transition of colloidal nanocrystal(NC) solids. The conducting solid described herein is the first example of the metallic properties of colloidal NCs. An unprecedentedly high electrical conductivity can be realized by the efficient generation of charge carriers onto a semiconducting Cu2-xS NC template via cation exchange. An electrical conductivity exceeding 10,300 S/cm is achieved successfully from bornite-phase NC films, and the temperature dependence of the corresponding film exhibits metallic characteristics. This NC film is demonstrated for a thermoelectric layer exhibiting a high figure of merit (ZT) exceeding 0.4 at 300K, electrical wires for swithching on LEDs, and source‒drain electrodes for organic field-effect transistors. Furthermore, the metallic NC films exhibited excellent stability in ambient conditions. This study proposes a strategic approach for modulating the electrical properties of colloidal NC solids.