Journal
NANOSCALE
Volume 8, Issue 16, Pages 8474-8479Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr01262k
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Funding
- SRC
- DARPA through STARnet Center for Function Accelerated nanoMaterial Engineering (FAME)
- Emerging Frontiers of Research Initiative (EFRI) 2-DARE project [NSF 005400]
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We demonstrate that, in contrast to most two-dimensional materials, ultrathin flakes of InSe are stable under ambient conditions. Despite their ambient stability, InSe-based nanodevices show an environmental p-type doping, suppressed by capping InSe with hexagonal boron nitride. By means of transport experiments, density functional theory and vibrational spectroscopy, we attribute the p-type doping assumed by uncapped InSe under an ambient atmosphere to the decomposition of water at Se vacancies. We have estimated the site-dependent adsorption energy of O-2, N-2, H2O, CO and CO2 on InSe. A stable adsorption is found only for the case of H2O, with a charge transfer of only 0.01 electrons per water molecule.
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