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Planar and van der Waals heterostructures for vertical tunnelling single electron transistors
Date Issued
01-12-2019
Author(s)
Kim, Gwangwoo
Kim, Sung Soo
Jeon, Jonghyuk
Yoon, Seong In
Hong, Seokmo
Cho, Young Jin
Indian Institute of Technology, Madras
Ozdemir, Servet
Yin, Jun
Ghazaryan, Davit
Holwill, Mathew
Mishchenko, Artem
Andreeva, Daria V.
Kim, Yong Jin
Jeong, Hu Young
Jang, A. Rang
Chung, Hyun Jong
Geim, Andre K.
Novoselov, Kostya S.
Sohn, Byeong Hyeok
Shin, Hyeon Suk
Abstract
Despite a rich choice of two-dimensional materials, which exists these days, heterostructures, both vertical (van der Waals) and in-plane, offer an unprecedented control over the properties and functionalities of the resulted structures. Thus, planar heterostructures allow p-n junctions between different two-dimensional semiconductors and graphene nanoribbons with well-defined edges; and vertical heterostructures resulted in the observation of superconductivity in purely carbon-based systems and realisation of vertical tunnelling transistors. Here we demonstrate simultaneous use of in-plane and van der Waals heterostructures to build vertical single electron tunnelling transistors. We grow graphene quantum dots inside the matrix of hexagonal boron nitride, which allows a dramatic reduction of the number of localised states along the perimeter of the quantum dots. The use of hexagonal boron nitride tunnel barriers as contacts to the graphene quantum dots make our transistors reproducible and not dependent on the localised states, opening even larger flexibility when designing future devices.
Volume
10