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Air Stable p-Doping of WSe2 by Covalent Functionalization
Abstract
Covalent functionalization of transition metal dichalcogenides (TMDCs) is investigated for air-stable chemical doping. Specifically, p-doping of WSe(2) via NOx chemisorption at 150 °C is explored, with the hole concentration tuned by reaction time. Synchrotron based soft X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) depict the formation of various WSe(2-x-y)O(x)N(y) species both on the surface and interface between layers upon chemisorption reaction. Ab initio simulations corroborate our spectroscopy results in identifying the energetically favorable complexes, and predicting WSe(2):NO at the Se vacancy sites as the predominant dopant species. A maximum hole concentration of ∼ 10(19) cm(-3) is obtained from XPS and electrical measurements, which is found to be independent of WSe(2) thickness. This degenerate doping level facilitates 5 orders of magnitude reduction in contact resistance between Pd, a common p-type contact metal, and WSe(2). More generally, the work presents a platform for manipulating the electrical properties and band structure of TMDCs using covalent functionalization.
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Cites
Electronics and optoelectronics of two-dimensional transition metal dichalcogenides
Wang, Q. H., Kalantar-Zadeh, K., Kis, A., Coleman, J. N., & Strano, M. S. (2012) · Nature Nanotechnology · doi:10.1038/nnano.2012.193 · Cited by 16,374
Cited by
Zeng, M., Xiao, Y., Liu, J., Yang, K., & Fu, L. (2018) · Chemical Reviews · doi:10.1021/acs.chemrev.7b00633 · Cited by 574
Ryder, C. R., Wood, J. D., Wells, S. A., & Hersam, M. C. (2016) · ACS Nano · doi:10.1021/acsnano.6b01091 · Cited by 283
Self-Limiting Layer-by-Layer Oxidation of Atomically Thin WSe2
Yamamoto, M., Dutta, S., Aikawa, S., Nakaharai, S., Wakabayashi, K., Fuhrer, M. S., Ueno, K., & Tsukagoshi, K. (2015) · Nano Letters · doi:10.1021/nl5049753 · Cited by 258
Metadata
- Authors
- Zhao, P., Kiriya, D., Azcatl, A., Zhang, C., Tosun, M., Liu, Y.-S., Hettick, M., Kang, J. S., McDonnell, S., KC, S., Guo, J., Cho, K., Wallace, R. M., & Javey, A.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-09-22
- Volume
- 8
- Issue
- 10
- Pages
- 10808-10814
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2149581862
- Cited by
- 260
- References
- 1
- FWCI
- 9.83
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhao, P., Kiriya, D., Azcatl, A., Zhang, C., Tosun, M., Liu, Y.-S., Hettick, M., Kang, J. S., McDonnell, S., KC, S., Guo, J., Cho, K., Wallace, R. M., & Javey, A. (2014). Air Stable p-Doping of WSe2 by Covalent Functionalization. ACS Nano. https://doi.org/10.1021/nn5047844
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