Structural and electronic properties of polycrystalline InAs thin films deposited on silicon dioxide and glass at temperatures below 500 °c

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Date
2021-02-05
Authors
Curran, Anya
Gocalinska, Agnieszka
Pescaglini, Andrea
Secco, Eleonora
Mura, Enrica
Thomas, Kevin
Nagle, Roger E.
Sheehan, Brendan
Povey, Ian M.
Pelucchi, Emanuele
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MDPI
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Abstract
Polycrystalline indium arsenide (poly InAs) thin films grown at 475 °C by metal organic vapor phase epitaxy (MOVPE) are explored as possible candidates for low-temperature-grown semiconducting materials. Structural and transport properties of the films are reported, with electron mobilities of ~100 cm2/V·s achieved at room temperature, and values reaching 155 cm2/V·s for a heterostructure including the polycrystalline InAs film. Test structures fabricated with an aluminum oxide (Al2O3) top-gate dielectric show that transistor-type behavior is possible when poly InAs films are implemented as the channel material, with maximum ION/IOFF > 250 achieved at −50 °C and ION/IOFF = 90 at room temperature. Factors limiting the ION/IOFF ratio are investigated and recommendations are made for future implementation of this material.
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Keywords
InAs , Polycrystalline , Thin films
Citation
Curran, A., Gocalinska, A., Pescaglini, A., Secco, E., Mura, E., Thomas, K., Nagle, R.E., Sheehan, B., Povey, I.M., Pelucchi, E., O’Dwyer, C., Hurley, P.K. and Gity, F. (2021) ‘Structural and electronic properties of polycrystalline inas thin films deposited on silicon dioxide and glass at temperatures below 500 °c’, Crystals, 11(2), 160 (11 pp). https://doi.org/10.3390/cryst11020160