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Raman measurements reveal thickness-dependent variations in phonon frequencies and intensities below \u223c20 nm, enabling thickness identification through frequency differences between phonon modes. In addition, PL measurements show a pronounced quenching of the PL intensity with decreasing thickness, attributed to enhanced nonradiative recombination associated with surface states and thickness-induced modifications of the electronic structure, accompanied by a blueshift of the PL energy. In agreement with these observations, first-principles calculations demonstrate a thickness-driven evolution of the band structure, with a transition from an indirect character in few-layer systems toward a more direct gap in thicker structures, governed by the interplay between quantum confinement and interlayer coupling. Complementary excitation-power-dependent PL measurements further show distinct recombination dynamics in bulk samples, with sublinear behavior for trapped excitons and superlinear dependence for bound and free excitons, consistent with a state-filling mechanism in localized states. These findings establish a consistent framework linking thickness, electronic structure, and recombination processes in GaSe0.5Te0.5 alloy, and provide key insights for the design and optimization of optoelectronic devices based on PTMC alloys.<\/jats:p>","DOI":"10.1021\/acsomega.6c03781","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T20:01:35Z","timestamp":1784145695000},"page":"43954-43961","source":"Crossref","is-referenced-by-count":0,"title":["Thickness-Dependent\nOptical Properties and Exciton\nRecombination Dynamics in the GaSe0.5Te0.5 Alloy"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3090-7418","authenticated-orcid":true,"given":"Maykol","family":"Oliveira","sequence":"first","affiliation":[{"name":"Universidade Federal Do Piaui\u0301 , , , ,","place":["Teresina, Piaui\u0301, Brazil, 64049-550"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabri\u0301cio M.","family":"de Vasconcelos","sequence":"additional","affiliation":[{"name":"Instituto Federal Do Piaui\u0301 - Campus Piripiri , , ,","place":["Piripiri, Piaui\u0301, Brazil, 64260-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3462-4423","authenticated-orcid":true,"given":"Fa\u0301bio F.","family":"Leite","sequence":"additional","affiliation":[{"name":"Universidade Federal Do Amapa\u0301 , , , ,","place":["Macapa\u0301, Amapa\u0301, Brazil, 68903-419"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nestor","family":"Perea-Lo\u0301pez","sequence":"additional","affiliation":[{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]},{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7189-5222","authenticated-orcid":true,"given":"Da","family":"Zhou","sequence":"additional","affiliation":[{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0010-2851","authenticated-orcid":true,"given":"Mauricio","family":"Terrones","sequence":"additional","affiliation":[{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]},{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]},{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]},{"name":"The Pennsylvania State University , , , ,","place":["University Park, Pennsylvania, United States, 16802"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1496-1625","authenticated-orcid":true,"given":"Francisco E. P.","family":"Santos","sequence":"additional","affiliation":[{"name":"Universidade Federal Do Piaui\u0301 , , , ,","place":["Teresina, Piaui\u0301, Brazil, 64049-550"]},{"name":"Universidade Federal Do Piaui\u0301 , , , ,","place":["Teresina, Piaui\u0301, Brazil, 64049-550"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3802-1168","authenticated-orcid":true,"given":"Antonio G.","family":"Souza Filho","sequence":"additional","affiliation":[{"name":"Universidade Federal Do Ceara\u0301 , , , ,","place":["Fortaleza, Ceara\u0301, Brazil, 60455-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5207-4269","authenticated-orcid":true,"given":"Bartolomeu C.","family":"Viana","sequence":"additional","affiliation":[{"name":"Universidade Federal Do Piaui\u0301 , , , ,","place":["Teresina, Piaui\u0301, Brazil, 64049-550"]},{"name":"Universidade Federal Do Piaui\u0301 , , , ,","place":["Teresina, Piaui\u0301, Brazil, 64049-550"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9992-7564","authenticated-orcid":true,"given":"Rafael S.","family":"Alencar","sequence":"additional","affiliation":[{"name":"Universidade Federal Do Ceara\u0301 , , , ,","place":["Fortaleza, Ceara\u0301, Brazil, 60455-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,15]]},"reference":[{"key":"2026072810103917200_cit1","doi-asserted-by":"publisher","DOI":"10.1002\/advs.202003834","article-title":"2D Materials\nEnabled Next-Generation Integrated Optoelectronics: from Fabrication","volume":"8","author":"Cheng","year":"2021","journal-title":"Adv. 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