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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport

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An effective approach to realize graphene based p-n junctions via adsorption of donor and acceptor molecules

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Title
An effective approach to realize graphene based p-n junctions via adsorption of donor and acceptor molecules
Author
Rezapour, M. RezaLee, GeunsikKim, Kwang S.
Issue Date
2019-11
Publisher
Pergamon Press Ltd.
Citation
CARBON, v.153, pp.525 - 530
Abstract
Atomically thin two dimensional materials such as graphene offer excellent capabilities suitable for a number of low power versatile applications. Here, employing first principle calculations, we introduce a feasible approach to realize an efficient graphene based p-n junction (PNJ) which is composed of non-covalently physisorbed tetracyanoquinodimethane (TCNQ) and tetrathiafulvalene (TTF) molecules onto an armchair graphene nanoribbon (AGNR). We show that compared to conventional graphene based p-n systems, our suggested PNJ exhibits low threshold voltage (), large current-voltage ratio, and almost no sensitivity to conformational variations. Using a simple model, we also provide a theoretical background to explain the rectifying behavior of the suggested PNJ and show that tuning the distance between p and n doped regions modifies the current-voltage ratio. Our study indicates that the perfect diode behavior along with stability under various practical conditions makes our proposed PNJ a promising building block to fabricate next generation graphene based nanosize transistors.
URI
https://scholarworks.unist.ac.kr/handle/201301/27163
URL
https://www.sciencedirect.com/science/article/pii/S0008622319307559
DOI
10.1016/j.carbon.2019.07.062
ISSN
0008-6223
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