{"id":10175,"date":"2019-04-23T15:42:51","date_gmt":"2019-04-23T15:42:51","guid":{"rendered":"https:\/\/www.thermofisher.com\/blog\/materials\/?p=10175"},"modified":"2026-09-16T11:06:53","modified_gmt":"2026-09-16T16:06:53","slug":"looking-at-high-k-thin-film-depositions-with-multiple-surface-analysis-techniques","status":"publish","type":"post","link":"https:\/\/www.thermofisher.com\/blog\/materials\/looking-at-high-k-thin-film-depositions-with-multiple-surface-analysis-techniques\/","title":{"rendered":"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques"},"content":{"rendered":"<p>Hafnium oxide\u202fis a highly insoluble thermally stable Hafnium source suitable for glass, optic and ceramic applications. Hafnium oxide is an inert, off-white powder also known as hafnia with a high melting point, it is among the most common and stable hafnium compounds.\u202fIt is now used as a\u202fgate dielectric\u202fin semiconductor transistors.<\/p>\n<div style=\"width: 460px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.thermofisher.com\/blog\/wp-content\/uploads\/sites\/7\/2019\/04\/semiconductor-6.jpg\" style=\"float: right;margin: 10px\" alt=\"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques\" title=\"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques\" width=\"450\" height=\"300\" \/><p class=\"wp-caption-text\">Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques<\/p><\/div>\n<p>Dielectric materials are not conductive to electricity and are therefore found in semiconductor devices. A commonly used material for gate dielectrics is silicon dioxide (SiO<sub>2<\/sub>). However as the thickness of silicon\u202fdioxide\u202f(SiO<sub>2<\/sub>) as the gate material becomes very thin (less than 1.5 nm), the tunnel current increases significantly. Therefore, the need exists for a\u202fdielectric\u202fmaterial with high K (K is the\u202fdielectric constant\u202fof the material), which will provide the required electrical properties.<\/p>\n<p>As the devices have continued to shrink, in part enabled by gate oxides grown with atomic layer depositions, new limitations on the bulk Si crystal have forced the industry to look for other alternatives to the traditional transistor concept including the Fin field effect transistor (FinFET) that Intel introduced into production with the 22 nm node. The gate oxide for these advanced devices are often extremely thin, high-k dielectrics, like Hafnium Oxide (HfO<sub>2<\/sub>).<\/p>\n<p>In this design, the fins need to be covered with a gate oxide of great compositional and thickness uniformity and without pinholes, a task tailored for ALD. Measurement of the gate oxides&rsquo; compositional and thickness uniformity, and the appearance of pinholes, is of critical importance to assuring confidence in the process, as well as understanding factors which affect yield. <a href=\"http:\/\/bit.ly\/2IBjKbV\" target=\"_blank\" rel=\"noopener noreferrer\">A multi-technique surface analysis using a fully-automated instrument<\/a> provides the capability to measure the composition, coverage and band gap analysis of ALD-grown ultra thin films.<\/p>\n<p>In the example described, the high-k dieletric thin film HfO<sub>2<\/sub> is deposited onto a silicon oxide on silicon wafer (SiO<sub>2<\/sub>\/Si) via ALD. After each ALD cycle, the thickness of deposited HfO<sub>2<\/sub> is quantified over the length of the ALD process by extracting thickness information from XPS data. XPS is firstly used to quantify the amount of hafnium deposited onto the substrate and measure the thickness of the HfO<sub>2<\/sub> and SiO<sub>2<\/sub> layers.<\/p>\n<p>In practice, thin film coverage may not be completely uniform during deposition. Quality control in this aspect of sample production though measurements of sample coverage by ISS. In contrast to XPS, ISS extracts spectral information from the top monolayer of the sample only. Using that information, any Si signal acquired in the ion scattering spectroscopy(ISS) spectra indicated and incomplete surface coverage of HfO<sub>2<\/sub>. In this example, after 50 cycles the Si peak has been removed from the spectra completely, therefore it can be deduced that the ALD process reaches full coverage between 20 and 50 cycles. Technical details regarding the physics behind this approach is detailed in the app note.<\/p>\n<p>One of the key properties of gate dielectric components or high-k dielectric materials in general is the band gap. This property, denoting the energy difference between the valence and conduction bands of a material, is the driving force behind many desirable material applications, like LEDs, photovoltaics or solar cells.<\/p>\n<p>While band gap measurements can be routinely performed using XPS on most materials, when it comes to high-k dielectric materials, like HfO<sub>2<\/sub>, overlap of XPS peaks in the band gap energy region make measurements more difficult. In this example, the all-in-one system includes reflected electron energy loss spectroscopy (REELS) and software that can automatically calculation the band gap of the sample material. Using the same dual source flood gun that is used for charge compensation, the band gap information is obtained, without the need for a second electron source.<\/p>\n<div style=\"width: 1011px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.thermofisher.com\/blog\/wp-content\/uploads\/sites\/7\/2019\/04\/xps-multi-6.png\" alt=\"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques\" title=\"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques\" width=\"1001\" height=\"589\" \/><p class=\"wp-caption-text\">Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques<\/p><\/div>\n<p><a href=\"https:\/\/assets.thermofisher.com\/TFS-Assets\/MSD\/Application-Notes\/AN52110-spectroscopic-analysis-solid-oxide-fuel-cell-material-xps.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Read more<\/a> about how compositional and thickness information taken from XPS data provides coverage analysis via ISS and band gap measurements via REELS, producing a complete picture of properties vital to the development of ultra-thin film materials for semiconductor applications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hafnium oxide\u202fis a highly insoluble thermally stable Hafnium source suitable for glass, optic and ceramic applications. Hafnium oxide is an inert, off-white powder also known as hafnia with a high melting point, it is among the most common and stable hafnium compounds.\u202fIt is now used as a\u202fgate dielectric\u202fin semiconductor transistors. Dielectric materials are not conductive<\/p>\n","protected":false},"author":45,"featured_media":10193,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[962],"tags":[941],"division":[],"class_list":{"0":"post-10175","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-x-ray-photoelectron-spectroscopy","8":"tag-electronics-semiconductors","9":"entry"},"_selected_authors":[1319],"_selected_reviewers":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques - Advancing Materials<\/title>\n<meta name=\"description\" content=\"Explore high-k thin film deposition using multiple surface analysis techniques to characterize composition, chemistry, interfaces, and material performance.\" \/>\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.thermofisher.com\/blog\/materials\/looking-at-high-k-thin-film-depositions-with-multiple-surface-analysis-techniques\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Looking at High-K Thin Film Depositions With Multiple Surface Analysis Techniques\" \/>\n<meta property=\"og:description\" content=\"Explore high-k thin film deposition using multiple surface analysis techniques to characterize composition, chemistry, interfaces, and material performance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.thermofisher.com\/blog\/materials\/looking-at-high-k-thin-film-depositions-with-multiple-surface-analysis-techniques\/\" \/>\n<meta property=\"og:site_name\" content=\"Advancing Materials\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/thermofisher\" \/>\n<meta property=\"article:published_time\" content=\"2019-04-23T15:42:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-16T16:06:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/admin.acceleratingscience.com\/materials\/wp-content\/uploads\/sites\/7\/2019\/04\/semiconductor-6.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"3600\" \/>\n\t<meta property=\"og:image:height\" content=\"2400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Carl D. 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