Blue emission at atomically sharp 1D heterojunctions between graphene and h-BN

Gwangwoo Kim, Kyung Yeol Ma, Minsu Park, Minsu Kim, Jonghyuk Jeon, Jinouk Song, José Eduardo Barrios-Vargas, Yuta Sato, Yung-Chang Lin, Kazu Suenaga, Stephan Roche, Seunghyup Yoo, Byeong-Hyeok Sohn, Seokwoo Jeon and Hyeon Suk Shin ()
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Gwangwoo Kim: Ulsan National Institute of Science and Technology (UNIST)
Kyung Yeol Ma: Ulsan National Institute of Science and Technology (UNIST)
Minsu Park: Korea Advanced Institute of Science and Technology (KAIST)
Minsu Kim: Ulsan National Institute of Science and Technology (UNIST)
Jonghyuk Jeon: Seoul National University
Jinouk Song: Korea Advanced Institute of Science and Technology (KAIST)
José Eduardo Barrios-Vargas: Facultad de Química, UNAM
Yuta Sato: National Institute of Advanced Industrial Science and Technology (AIST)
Yung-Chang Lin: National Institute of Advanced Industrial Science and Technology (AIST)
Kazu Suenaga: National Institute of Advanced Industrial Science and Technology (AIST)
Stephan Roche: CSIC and The Barcelona Institute of Science and Technology, Campus UAB
Seunghyup Yoo: Korea Advanced Institute of Science and Technology (KAIST)
Byeong-Hyeok Sohn: Seoul National University
Seokwoo Jeon: Korea Advanced Institute of Science and Technology (KAIST)
Hyeon Suk Shin: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Atomically sharp heterojunctions in lateral two-dimensional heterostructures can provide the narrowest one-dimensional functionalities driven by unusual interfacial electronic states. For instance, the highly controlled growth of patchworks of graphene and hexagonal boron nitride (h-BN) would be a potential platform to explore unknown electronic, thermal, spin or optoelectronic property. However, to date, the possible emergence of physical properties and functionalities monitored by the interfaces between metallic graphene and insulating h-BN remains largely unexplored. Here, we demonstrate a blue emitting atomic-resolved heterojunction between graphene and h-BN. Such emission is tentatively attributed to localized energy states formed at the disordered boundaries of h-BN and graphene. The weak blue emission at the heterojunctions in simple in-plane heterostructures of h-BN and graphene can be enhanced by increasing the density of the interface in graphene quantum dots array embedded in the h-BN monolayer. This work suggests that the narrowest, atomically resolved heterojunctions of in-plane two-dimensional heterostructures provides a future playground for optoelectronics.

Date: 2020
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DOI: 10.1038/s41467-020-19181-2

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