{"id":8082,"date":"2026-11-03T09:48:45","date_gmt":"2026-11-03T08:48:45","guid":{"rendered":"https:\/\/www.cnrs-imn.fr\/event\/eugene-bertin-seminar\/"},"modified":"2026-11-06T12:16:01","modified_gmt":"2026-11-06T11:16:01","slug":"eugene-bertin-seminar","status":"publish","type":"tribe_events","link":"https:\/\/www.cnrs-imn.fr\/en\/event\/eugene-bertin-seminar\/","title":{"rendered":"Eug\u00e8ne BERTIN Seminar"},"content":{"rendered":"

Combinatorial Hardware and Software for Accelerated Discovery of Multianion Optoelectronic Thin Films<\/strong><\/p>\n

\"\"
\nEug\u00e8ne Bertin<\/strong><\/p>\n

National Center for Nanofabrication and Characterization – DTU Orbit, Lyngby, Denmark<\/a><\/p>\n

Abstract<\/strong><\/p>\n

Multi-anion semiconductors\u2014compounds that combine two or more anion species, such as S, P, N, or Se\u2014offer a remarkable degree of chemical and structural diversity for optoelectronics, yet studies on their thin-film synthesis remain scarce. We address this with a glove-box-integrated combinatorial platform: a reactive sputtering chamber (PH3<\/sub>, H2<\/sub>S, NH3<\/sub>, N2<\/sub> and a S cracking source), a rapid thermal annealing furnace that uses the same reactive gases, and an evaporator for volatile metals. Two-dimensional compositional gradients on a single substrate enable rapid mapping of unexplored composition space, while an IA-ready data infrastructure built on NOMAD captures the structural and optoelectronic property data of the entire sample libraries. Across more than 20,000 samples in exotic ternary systems, including Zr-S-N, Ba-Cd-P, Cu-P-S, Ag-P-S, Sn-P-S, Sb-P-S, Ba-P-S, Ba-Zr-S, and Ba-P-Te, we highlight the defect-tolerant Zintl phase BaCd2<\/sub>P2<\/sub> BaP, synthesized for the first time as a thin film,4<\/sub>Te2<\/sub> with unusual P-Te bonds and novel SnPS3<\/sub> and Cu3<\/sub>P.S.4<\/sub>, two vacuum-processed phosphosulfides with photoluminescence.<\/p>\n

We also report the first Zr sulfonitride2<\/sub>SN2<\/sub> thin film, a member of the unexplored (Hf,Zr)2<\/sub>(S,Se)N2<\/sub> a family of chalcogenides that defy the usual trade-off between refractive index, transparency, and free-carrier conductivity. Hybrid density functional theory predicts low effective masses, UV absorption edges, and sub-bandgap refractive indices of up to 2.84, exceeding those of TiO2<\/sub> and SiC, but no method for synthesizing thin films existed. Reactive sputtering followed by rapid thermal annealing yields the first chalconitride thin film, Zr2<\/sub>SN2<\/sub>, which confirms the predictions: refractive index n > 2.7, absorption edge at 2.9 eV, and degenerate n-type conductivity (carrier concentration >1020<\/sup> cm-3<\/sup>, in-grain mobility > 8 cm2<\/sup>V-1<\/sup>s-1<\/sup>). The theory attributes this unusual combination to a decoupled band structure with forbidden optical transitions at the direct bandgap, a very large density of states in the UV, and low effective masses at the indirect bandgap. A transparent conductor that is also a high-index dielectric could serve simultaneously as an antireflection, index-matching, and charge-extraction layer in thin-film photovoltaics and opens up a new design space for photonics more broadly. Zr2<\/sub>SN2<\/sub> illustrates what combinatorial exploration of multi-anion chemistry can achieve.<\/p>\n

Contact<\/strong>: L\u00e9o Choubrac (MIOPS)<\/p>\n","protected":false},"excerpt":{"rendered":"

Combinatorial Hardware and Software for Accelerated Discovery of Multianion Optoelectronic […]<\/p>\n","protected":false},"author":4,"featured_media":8083,"template":"","meta":{"_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[],"class_list":["post-8082","tribe_events","type-tribe_events","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nEug\u00e8ne BERTIN Seminar - IMN<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnrs-imn.fr\/en\/event\/eugene-bertin-seminar\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Eug\u00e8ne BERTIN Seminar - IMN\" \/>\n<meta property=\"og:description\" content=\"Combinatorial Hardware and Software for Accelerated Discovery of Multianion Optoelectronic [...]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnrs-imn.fr\/en\/event\/eugene-bertin-seminar\/\" \/>\n<meta property=\"og:site_name\" content=\"IMN\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-06T11:16:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnrs-imn.fr\/wp-content\/uploads\/2026\/11\/Eugene_Bertin.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"150\" \/>\n\t<meta property=\"og:image:height\" content=\"150\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnrs-imn.fr\\\/en\\\/event\\\/eugene-bertin-seminar\\\/\",\"url\":\"https:\\\/\\\/www.cnrs-imn.fr\\\/en\\\/event\\\/eugene-bertin-seminar\\\/\",\"name\":\"Eug\u00e8ne BERTIN Seminar - 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