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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Communications Technology and Electronics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Communications Technology and Electronics</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиотехника и электроника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0033-8494</issn><issn publication-format="electronic">3034-5901</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">650676</article-id><article-id pub-id-type="doi">10.31857/S0033849424050074</article-id><article-id pub-id-type="edn">ILGOKX</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>НАНОЭЛЕКТРОНИКА</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">The effect of germanium wetting layer on the percolation processes in ultrathin copper films and their microwave transmission, reflection and absorption coefficients</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние подслоя германия на процессы перколяции в ультратонких пленках меди и их оптические коэффициенты</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vdovin</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Вдовин</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vdv@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Andreev</surname><given-names>V. G.</given-names></name><name xml:lang="ru"><surname>Андреев</surname><given-names>В. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vdv@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pyataikin</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Пятайкин</surname><given-names>И. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vdv@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pinaev</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Пинаев</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vdv@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kotel’nikov Institute of Radio Engineering and Electronics of RAS</institution></aff><aff><institution xml:lang="ru">Институт радиотехники и электроники им. В. А. Котельникова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>69</volume><issue>5</issue><fpage>448</fpage><lpage>454</lpage><history><date date-type="received" iso-8601-date="2025-01-31"><day>31</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://innoscience.ru/0033-8494/article/view/650676">https://innoscience.ru/0033-8494/article/view/650676</self-uri><abstract xml:lang="en"><p>The microwave coefficients of copper films with a thickness of 1...16 nm grown on a 1.8 nm germanium sublayer deposited on the surface of quartz glass substrates with a thickness of 4 mm are studied. The measurements have been carried out in a rectangular waveguide with a cross section of 23×10 mm<sup>2</sup> in the frequency range of 8.5...12.5 GHz. A smooth change in the microwave coefficients of the samples studied is detected in the range of copper film thicknesses of 2...16 nm. It is established that the critical percolation thickness of the copper films grown on germanium sublayer is in the range between 1 and 2 nm. A significant internal size effect is found in the films grown on Ge sublayer due to the scattering of conduction electrons mainly by intercrystalline boundaries. It is determined that the coefficient of reflection of conduction electrons by the intercrystalline boundaries of the copper films with Ge sublayer is more than three times higher than a similar coefficient in Cu films grown directly on the glass substrates.</p></abstract><trans-abstract xml:lang="ru"><p>Исследованы оптические коэффициенты пленок меди толщиной 1…16 нм, выращенных на подслое германия, напыленного на поверхность подложек из кварцевого стекла толщиной 4 мм. Измерения выполнены в прямоугольном волноводе сечением 23 × 10 мм<sup>2</sup> в диапазоне частот 8.5…12.5 ГГц. В диапазоне толщин 2…16 нм обнаружено плавное изменение оптических коэффициентов пленок меди, выращенных на германиевом подслое. Установлено, что перколяционная толщина медных пленок, выращенных на подслое германия, заключена в диапазоне между 1 и 2 нм. Обнаружен сильный размерный эффект в пленках, выращенных на Ge-подслое, обусловленный рассеянием электронов проводимости преимущественно на межкристаллитных границах. Установлено, что коэффициент отражения электронов от межкристаллитных границ в пленках с Ge-подслоем более чем в три раза превосходит аналогичный коэффициент в пленках, выращенных непосредственно на подложке.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ultrathin copper films</kwd><kwd>percolation</kwd><kwd>microwave transmission</kwd><kwd>reflection and absorption coefficients</kwd><kwd>size effect</kwd><kwd>germanium wetting layer</kwd><kwd>twins boundaries</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ультратонкие медные пленки</kwd><kwd>перколяция</kwd><kwd>СВЧ коэффициенты прохождения</kwd><kwd>отражения и поглощения</kwd><kwd>классический размерный эффект</kwd><kwd>германиевый подслой</kwd><kwd>границы двойников</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Каплан А. 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