Molecular beam epitaxy of large-area SnSe2 with monolayer thickness fluctuation
- Authors
- Park, Young Woon; Jerng, Sahng-Kyoon; Jeon, Jae Ho; Roy, Sanjib Baran; Akbar, Kamran; Kim, Jeong; Sim, Yumin; Seong, Maeng-Je; Kim, Jung Hwa; Lee, Zonghoon; Kim, Minju; Yi, Yeonjin; Kim, Jinwoo; Noh, Do Young; Chun, Seung-Hyun
- Issue Date
- Mar-2017
- Publisher
- IOP PUBLISHING LTD
- Keywords
- molecular beam epitaxy; van der Waals epitaxy; SnSe2; Raman spectroscopy; transmission electron microscopy; field effect transistor
- Citation
- 2D MATERIALS, v.4, no.1
- Journal Title
- 2D MATERIALS
- Volume
- 4
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/4701
- DOI
- 10.1088/2053-1583/aa51a2
- ISSN
- 2053-1583
2053-1583
- Abstract
- The interest in layered materials is largely based on the expectation that they will be beneficial for a variety of applications, from low-power-consuming, wearable electronics to energy harvesting. However, the properties of layered materials are highly dependent on thickness, and the difficulty of controlling thickness over a large area has been a bottleneck for commercial applications. Here, we report layer-by-layer growth of SnSe2, a layered semiconducting material, via van der Waals epitaxy. The films were fabricated on insulating mica substrates with substrate temperatures in the range of 210 degrees C-370 degrees C. The surface consists of a mixture of Nand (N +/- 1) layers, showing that the thickness of the film can be defined with monolayer accuracy (+/- 0.6 nm). High-resolution transmission electron microscopy reveals a polycrystalline film with a grain size of similar to 100 nm and clear Moire patterns from overlapped grains with similar thickness. We also report field effect mobility values of 3.7 cm(2) V-1 s(-1) and 6.7 cm(2) V-1 s(-1) for 11 and 22 nm thick SnSe2, respectively. SnSe2 films with customizable thickness can provide valuable platforms for industry and academic researchers to fully exploit the potential of layered materials.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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