Coherent Thermoelectric Power from Graphene Quantum Dots

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Title
Coherent Thermoelectric Power from Graphene Quantum Dots
Author(s)
Mali Zhao; Dohyun Kim; Van Luan Nguyen; Jinbao Jiang; Linfeng Sun; Young Hee Lee; Heejun Yang
Publication Date
2019-01
Journal
NANO LETTERS, v.19, no.1, pp.61 - 68
Publisher
AMER CHEMICAL SOC
Abstract
The quantum confinement of charge carriers has been a promising approach to enhance the efficiency of thermoelectric devices, by lowering the dimension of materials and raising the boundary phonon scattering rate. The role of quantum confinement in thermoelectric efficiency has been investigated by using macroscopic device-scale measurements based on diffusive electron transport with the thermal de Broglie wavelength of the electrons. Here, we report a new class of thermoelectric operation originating from quasi-bound state electrons in low-dimensional materials. Coherent thermoelectric power from confined charges was observed at room temperature in graphene quantum dots with diameters of several nanometers. The graphene quantum dots, electrostatically defined as circular n-p-n junctions to isolate charges in the p-type graphene quantum dots, enabled thermoelectric microscopy at the atomic scale, revealing weakly localized and coherent thermoelectric power generation. The conceptual thermoelectric operation provides new insights, selectively enhancing coherent thermoelectric power via resonant states of charge carriers in low-dimensional materials. © 2018 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/5764
ISSN
1530-6984
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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