Au‐free ohmic contacts and their impact on sub‐contact charge carrier concentration in AlGaN/GaN heterostructures

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Abstract: The impact of an Au-free Ti/Al/Ti/TiN (20/100/20/80 nm) ohmic contact metallization on an Al0.21Ga0.79N/GaN heterostructure is investigated. Using the transfer length method and Hall measurements, the sheet resistance and the carrier concentration below the contact are analyzed, depending on the post-deposition annealing temperature. It is shown that with increasing annealing temperature, the carrier density below the contact is enhanced. This is caused by the contact formation mechanism, leading to an extremely low contact end resistance to the sub-contact region of 0.04 Ω mm. However, while the sub-contact semiconductor resistance is low, the contact (front) resistance to the device channel is 0.74 Ω mm after annealing at 900 °C, indicating a depletion of the sub-contact 2D electron gas because of alloy formation

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Notes: Physica status solidi. B, Basic research. - 259, 2 (2022) , 2100312, ISSN: 1521-3951

Event: Veröffentlichung

(where): Freiburg

(who): Universität

(when): 2022

Creator: Garbe, Valentin
Cecil, Alexander
Seidel, Sarah
Abendroth, Barbara
Stöcker, Hartmut
Döring, Philipp
Meyer, Dirk C.
Heitmann, Johannes

DOI: 10.1002/pssb.202100312

URN: urn:nbn:de:bsz:25-freidok-2281551

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:36 AM CEST

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2022

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Au‐free ohmic contacts and their impact on sub‐contact charge carrier concentration in AlGaN/GaN heterostructures

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Other Objects (12)

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Low Resistivity n‐type GaN Ohmic Contacts on GaN Substrates

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