High carrier mobility in graphene doped using a monolayer of tungsten oxyselenide

Autor: Mark E. Ziffer, Kenji Watanabe, Amirali Zangiabadi, Ipshita Datta, Younghun Jung, Bumho Kim, Apoorv Jindal, Myeongjin Lee, Min Sup Choi, Michal Lipson, James T. Teherani, James Hone, Ioannis Kymissis, Maya N. Nair, Xiaoyang Zhu, Ankur Nipane, Zachary A. Lamport, Daniel Rhodes, Abhinandan Borah, Abhay Pasupathy, B. Kim, Takashi Taniguchi, Won Jong Yoo
Rok vydání: 2021
Předmět:
Zdroj: Nature Electronics. 4:731-739
ISSN: 2520-1131
DOI: 10.1038/s41928-021-00657-y
Popis: Doped graphene could be of use in next-generation electronic and photonic devices. However, chemical doping cannot be precisely controlled in the material and leads to external disorder that diminishes carrier mobility and conductivity. Here we show that graphene can be efficiently doped using a monolayer of tungsten oxyselenide (TOS) that is created by oxidizing a monolayer of tungsten diselenide. When the TOS monolayer is in direct contact with graphene, a room-temperature mobility of 2,000 cm2 V−1 s−1 at a hole density of 3 × 1013 cm−2 is achieved. Hole density and mobility can also be controlled by inserting tungsten diselenide interlayers between TOS and graphene, where increasing the layers reduces the disorder. With four layers, a mobility value of around 24,000 cm2 V−1 s−1 is observed, approaching the limit set by acoustic phonon scattering, resulting in a sheet resistance below 50 Ω sq−1. To illustrate the potential of our approach, we show that TOS-doped graphene can be used as a transparent conductor in a near-infrared (1,550 nm) silicon nitride photonic waveguide and ring resonator. A monolayer of tungsten oxyselenide, created by oxidizing a layer of tungsten diselenide, can be used to efficiently dope graphene, leading to a room-temperature mobility of 2,000 cm2 V–1 s–1 at a hole density of 3 × 1013 cm–2.
Databáze: OpenAIRE
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