Výsledky vyhledávání - "Iryna Levchenko"

Akademický článek

Use of contraceptives in cats with ovarian and uterine pathology

Autor: Oleksandr Chekan, Artem Rokochyi, Olesia Kysterna, Yurii Musiienko, Iryna Levchenko

Publikováno v: Наукові горизонти, Vol 27, Iss 2, Pp 8-18 (2024)

Regulation of the reproductive capacity of cats using megestrol acetate (a gestagenic preparation) contributes to the development of pathological processes in the uterus, ovaries, and imbalance of gonadal hormones. Therefore, it is essential to inves

Externí odkaz: https://doaj.org/article/eebc9b5d187d4236a7f1ff3952324a89

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Akademický článek

Pros and Cons of (NH4)2S Solution Treatment of p-GaN/Metallization Interface: Perspectives for Laser Diode

Autor: Iryna Levchenko, Serhii Kryvyi, Eliana Kamińska, Julita Smalc-Koziorowska, Szymon Grzanka, Jacek Kacperski, Grzegorz Nowak, Sławomir Kret, Łucja Marona, Piotr Perlin

Publikováno v: Materials, Vol 17, Iss 18, p 4520 (2024)

The impact of wet treatment using an (NH4)2S-alcohol solution on the interface state of the p-GaN/Ni/Au/Pt contact system and laser diode processing was investigated. Sulfur wet cleaning resulted in reduced surface roughness and contact resistivity.

Externí odkaz: https://doaj.org/article/f9aca1eeca754e9a9f3bee150265933a

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Akademický článek

Palladium-Based Contacts on p-GaN and Their Application in Laser Diodes

Autor: Iryna Levchenko, Serhii Kryvyi, Eliana Kamińska, Szymon Grzanka, Ewa Grzanka, Łucja Marona, Piotr Perlin

Publikováno v: Materials, Vol 16, Iss 19, p 6568 (2023)

In this paper, we investigate the effect of Pd thickness and heat treatment on Pd/Ni/Au/p-GaN metal contacts. The as-deposited samples exhibit a smooth morphology and non-linear I–V characteristics. Heat treatment in a N2 atmosphere leads to degrad

Externí odkaz: https://doaj.org/article/80dab5480dba436bb1eeb762d57231ba

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Akademický článek

Refractive Index of Heavily Germanium-Doped Gallium Nitride Measured by Spectral Reflectometry and Ellipsometry

Autor: Dario Schiavon, Robert Mroczyński, Anna Kafar, Grzegorz Kamler, Iryna Levchenko, Stephen Najda, Piotr Perlin

Publikováno v: Materials, Vol 14, Iss 23, p 7364 (2021)

Gallium nitride (GaN) doped with germanium at a level of 1020 cm−3 is proposed as a viable material for cladding layers in blue- and green-emitting laser diodes. Spectral reflectometry and ellipsometry are used to provide evidence of a reduced inde

Externí odkaz: https://doaj.org/article/0a17a2709b894f66a56dd29a5bafd161

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Refractive Index of Heavily Germanium-Doped Gallium Nitride Measured by Spectral Reflectometry and Ellipsometry

Autor: Piotr Perlin, Robert Mroczyński, Grzegorz Kamler, Iryna Levchenko, Dario Schiavon, Stephen P. Najda, Anna Kafar

Publikováno v: Materials; Volume 14; Issue 23; Pages: 7364
Materials, Vol 14, Iss 7364, p 7364 (2021)
Materials

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ca324330c1f6838d46009fea58b9508

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