Tunneling Current in Oppositely Connected Schottky Diodes Formed by Contacts between Degenerate n-GaN and a Metal
- Authors: Maiboroda I.O.1, Grishchenko J.V.1, Ezubchenko I.S.1, Sokolov I.S.1, Chernych I.A.1, Andreev A.A.1, Zanaveskin M.L.1
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Affiliations:
- National Research Center “Kurchatov Institute”
- Issue: Vol 52, No 6 (2018)
- Pages: 776-782
- Section: Physics of Semiconductor Devices
- URL: https://journals.rcsi.science/1063-7826/article/view/203530
- DOI: https://doi.org/10.1134/S1063782618060131
- ID: 203530
Cite item
Abstract
The nonlinear behavior of the I–V characteristics of symmetric contacts between a metal and degenerate n-GaN, which form oppositely connected Schottky diodes, is investigated at free-carrier densities from 1.5 × 1019 to 2.0 × 1020 cm–3 in GaN. It is demonstrated that, at an electron density of 2.0 × 1020 cm–3, the conductivity between metal (chromium) and GaN is implemented via electron tunneling and the resistivity of the Cr–GaN contact is 0.05 Ω mm. A method for determining the parameters of potential barriers from the I–V characteristics of symmetric opposite contacts is developed. The effect of pronounced nonuniformity of the current density and voltage distributions over the contact area at low contact resistivity is taken into account. The potential-barrier height for Cr–n+-GaN contacts is found to be 0.47 ± 0.04 eV.
About the authors
I. O. Maiboroda
National Research Center “Kurchatov Institute”
Author for correspondence.
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
J. V. Grishchenko
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
I. S. Ezubchenko
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
I. S. Sokolov
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
I. A. Chernych
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
A. A. Andreev
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182
M. L. Zanaveskin
National Research Center “Kurchatov Institute”
Email: mrlbr@mail.ru
Russian Federation, Moscow, 123182