{"id":8848,"date":"2026-04-22T10:26:52","date_gmt":"2026-04-22T02:26:52","guid":{"rendered":"https:\/\/www.sic-wafers.com\/?p=8848"},"modified":"2026-04-22T10:26:58","modified_gmt":"2026-04-22T02:26:58","slug":"sic-wafer-specification-guide","status":"publish","type":"post","link":"https:\/\/www.sic-wafers.com\/fr\/sic-wafer-specification-guide\/","title":{"rendered":"SiC Wafer Specification Guide: Polytype, Doping, Micropipes and How to Choose"},"content":{"rendered":"
<\/div>\n

1. Introduction<\/h2>\n\n\n\n

Silicon carbide (SiC) has become a cornerstone material in power electronics, RF devices, and harsh-environment applications due to its wide bandgap, high thermal conductivity, and exceptional breakdown field. However, unlike silicon, Plaque de SiC<\/a> selection is highly non-trivial. Subtle differences in polytype, doping, and defect density can directly determine device performance, yield, and long-term reliability.<\/p>\n\n\n\n

This guide provides a deep, engineering-level overview of key SiC wafer specifications and offers practical selection strategies for buyers and process engineers.<\/p>\n\n\n\n

2. Polytypes: 4H-SiC vs 6H-SiC vs 3C-SiC<\/h2>\n\n\n\n

2.1 What is a Polytype?<\/h3>\n\n\n\n

SiC exists in multiple polytypes<\/strong>, which are different stacking sequences of Si\u2013C bilayers. These variations result in distinct electronic properties<\/strong>, even though the chemical composition is identical.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

2.2 Key Polytypes Comparison<\/h3>\n\n\n\n
Propri\u00e9t\u00e9<\/th>4H-SiC<\/th>6H-SiC<\/th>3C-SiC<\/th><\/tr><\/thead>
Crystal structure<\/td>Hexagonal<\/td>Hexagonal<\/td>Cubic<\/td><\/tr>
Bandgap (eV)<\/td>~3.26<\/td>~3.02<\/td>~2.36<\/td><\/tr>
Electron mobility<\/td>Haut<\/td>Mod\u00e9r\u00e9<\/td>Haut<\/td><\/tr>
Commercial maturity<\/td>\u2605\u2605\u2605\u2605\u2605<\/td>\u2605\u2605<\/td>\u2605<\/td><\/tr>
Utilisation typique<\/td>Power devices<\/td>RF (legacy)<\/td>Research \/ niche<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n

2.3 Selection Insight<\/h3>\n\n\n\n
    \n
  • 4H-SiC<\/strong> \u2192 Industry standard for MOSFETs, Schottky diodes<\/li>\n\n\n\n
  • 6H-SiC<\/strong> \u2192 Largely phased out, limited niche usage<\/li>\n\n\n\n
  • 3C-SiC<\/strong> \u2192 Still under development, mainly on Si substrates<\/li>\n<\/ul>\n\n\n\n

    \u2714 Conclusion :<\/strong>
    \ud83d\udc49 In >90% of commercial cases, 4H-SiC is the correct choice<\/strong><\/p>\n\n\n\n

    \n\n\n\n

    3. Doping: N-type, Semi-insulating, and Resistivity Control<\/h2>\n\n\n\n

    3.1 Doping Types<\/h3>\n\n\n\n
    Type<\/th>Dopant<\/th>R\u00e9sistivit\u00e9<\/th>Application<\/th><\/tr><\/thead>
    N-type<\/td>Azote (N)<\/td>Low (0.015\u20130.03 \u03a9\u00b7cm)<\/td>Power devices<\/td><\/tr>
    Semi-insulating (SI)<\/td>Vanadium (V)<\/td>Very high (>10\u2075 \u03a9\u00b7cm)<\/td>RF \/ microwave<\/td><\/tr>
    P-type<\/td>Aluminium (Al)<\/td>Mod\u00e9r\u00e9<\/td>Rare (substrate level)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    3.2 Engineering Implications<\/h3>\n\n\n\n
      \n
    • N-type substrates<\/strong>
      \u2192 Enable vertical conduction
      \u2192 Used in SiC MOSFETs, diodes<\/strong><\/li>\n\n\n\n
    • Semi-insulating substrates<\/strong>
      \u2192 Suppress parasitic capacitance
      \u2192 Critical for GaN-on-SiC RF devices<\/strong><\/li>\n<\/ul>\n\n\n\n

      3.3 Key Parameters to Specify<\/h3>\n\n\n\n
        \n
      • Resistivity range (e.g., 0.02\u20130.025 \u03a9\u00b7cm)<\/li>\n\n\n\n
      • Dopant uniformity<\/li>\n\n\n\n
      • Carrier concentration<\/li>\n<\/ul>\n\n\n\n

        \u2714 Buyer Tip:<\/strong>
        \ud83d\udc49 Always request radial resistivity uniformity maps<\/strong><\/p>\n\n\n\n

        4. Micropipes and Defects: The Yield Killer<\/h2>\n\n\n\n

        4.1 What are Micropipes?<\/h3>\n\n\n\n

        Micropipes are hollow-core screw dislocations that propagate along the crystal growth direction. They are among the most detrimental defects in SiC wafers.<\/p>\n\n\n\n

        4.2 Why They Matter<\/h3>\n\n\n\n
          \n
        • Cause device breakdown failure<\/strong><\/li>\n\n\n\n
        • Reduce yield dramatically<\/strong><\/li>\n\n\n\n
        • Act as leakage paths<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          4.3 Defect Metrics<\/h3>\n\n\n\n
          Param\u00e8tres<\/th>Typical Spec<\/th><\/tr><\/thead>
          Micropipe density (MPD)<\/td>< 1 cm\u207b\u00b2 (modern wafers)<\/td><\/tr>
          Threading dislocation density (TSD)<\/td>10\u00b3\u201310\u2075 cm\u207b\u00b2<\/td><\/tr>
          Basal plane dislocations (BPD)<\/td>Critical for reliability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n\n\n\n

          4.4 Industry Trend<\/h3>\n\n\n\n
            \n
          • Early SiC: MPD > 100 cm\u207b\u00b2<\/li>\n\n\n\n
          • Modern SiC: Near-zero micropipe wafers<\/strong><\/li>\n<\/ul>\n\n\n\n

            \u2714 Conclusion :<\/strong>
            \ud83d\udc49 Micropipes are no longer the main issue
            \ud83d\udc49 BPD and TSD now dominate reliability concerns<\/strong><\/p>\n\n\n\n

            5. Surface and Structural Specifications<\/h2>\n\n\n\n

            5.1 Wafer Size<\/h3>\n\n\n\n
              \n
            • 4 pouces (100 mm)<\/li>\n\n\n\n
            • 6 inch (150 mm) \u2192 mainstream<\/li>\n\n\n\n
            • 8 inch (200 mm) \u2192 emerging<\/li>\n<\/ul>\n\n\n\n

              5.2 Surface Quality<\/h3>\n\n\n\n
              Param\u00e8tres<\/th>Valeur typique<\/th><\/tr><\/thead>
              Roughness (Ra)<\/td>< 0.2 nm<\/td><\/tr>
              Variation de l'\u00e9paisseur totale (TTV)<\/td>< 5 \u00b5m<\/td><\/tr>
              Cha\u00eene\/archet<\/td>tightly controlled<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
              \n\n\n\n

              5.3 Orientation<\/h3>\n\n\n\n
                \n
              • Off-axis cut: typically 4\u00b0 toward <11-20><\/li>\n\n\n\n
              • Purpose: improve epitaxy quality<\/li>\n<\/ul>\n\n\n\n

                6. How to Choose: Application-Driven Selection<\/h2>\n\n\n\n

                6.1 For Power Devices (MOST COMMON)<\/h3>\n\n\n\n

                Recommended:<\/strong><\/p>\n\n\n\n

                  \n
                • Polytype: 4H-SiC<\/li>\n\n\n\n
                • Doping: N-type<\/li>\n\n\n\n
                • Resistivity: 0.015\u20130.03 \u03a9\u00b7cm<\/li>\n\n\n\n
                • Low BPD density<\/li>\n<\/ul>\n\n\n\n

                  \ud83d\udc49 Used in:<\/p>\n\n\n\n

                    \n
                  • EV inverters<\/li>\n\n\n\n
                  • Power supplies<\/li>\n\n\n\n
                  • Industrial drives<\/li>\n<\/ul>\n\n\n\n

                    6.2 For RF \/ Microwave Devices<\/h3>\n\n\n\n

                    Recommended:<\/strong><\/p>\n\n\n\n

                      \n
                    • Polytype: 4H-SiC<\/li>\n\n\n\n
                    • Doping: Semi-insulating<\/li>\n\n\n\n
                    • Ultra-high resistivity<\/li>\n<\/ul>\n\n\n\n

                      \ud83d\udc49 Used in:<\/p>\n\n\n\n

                        \n
                      • 5G base stations<\/li>\n\n\n\n
                      • Radar systems<\/li>\n<\/ul>\n\n\n\n

                        6.3 For Research \/ Special Applications<\/h3>\n\n\n\n
                          \n
                        • 3C-SiC on Si<\/li>\n\n\n\n
                        • Custom doping profiles<\/li>\n\n\n\n
                        • Experimental substrates<\/li>\n<\/ul>\n\n\n\n

                          7. Cost vs Specification Trade-off<\/h2>\n\n\n\n
                          Spec Level<\/th>Cost Impact<\/th>Benefit<\/th><\/tr><\/thead>
                          Low defect density<\/td>\u2191\u2191<\/td>Rendement plus \u00e9lev\u00e9<\/td><\/tr>
                          Tight resistivity control<\/td>\u2191<\/td>Stable performance<\/td><\/tr>
                          Larger diameter (6″ \u2192 8″)<\/td>\u2191\u2191<\/td>More chips per wafer<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                          \u2714 Key Insight:<\/strong>
                          \ud83d\udc49 Over-specifying = wasted cost
                          \ud83d\udc49 Under-specifying = yield loss<\/p>\n\n\n\n

                          \ud83d\udc49 The goal is \u201cfit-for-purpose specification\u201d<\/strong><\/p>\n\n\n\n

                          8. Common Buyer Mistakes<\/h2>\n\n\n\n

                          \u274c Choosing 6H-SiC for new designs
                          \u274c Ignoring defect density reports
                          \u274c Not specifying off-axis angle
                          \u274c Buying only based on price<\/p>\n\n\n\n

                          9. Conclusion<\/h2>\n\n\n\n

                          Selecting the right SiC wafer requires a mul<\/strong>ti-parameter optimization, balancing:<\/p>\n\n\n\n

                            \n
                          • Polytype (almost always 4H)<\/li>\n\n\n\n
                          • Doping (N-type vs SI)<\/li>\n\n\n\n
                          • Defect density (MPD, BPD, TSD)<\/li>\n\n\n\n
                          • Surface and structural quality<\/li>\n<\/ul>\n\n\n\n

                            As the SiC industry matures, defect engineering and epitaxy compatibility have become more critical than basic material availability.<\/p>\n\n\n\n

                            10. Practical Takeaway<\/h2>\n\n\n\n

                            \ud83d\udc49 If you only remember one thing:<\/p>\n\n\n\n

                            \n

                            Match the wafer to your device architecture\u2014not the other way around<\/p>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"

                            1. Introduction Silicon carbide (SiC) has become a cornerstone material in power electronics, RF devices, and harsh-environment applications due to its wide bandgap, high thermal conductivity, and exceptional breakdown field. However, unlike silicon, SiC wafer selection is highly non-trivial. Subtle differences in polytype, doping, and defect density can directly determine device performance, yield, and long-term […]<\/p>\n","protected":false},"author":2,"featured_media":8849,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[27,12],"tags":[1166,2296,1860,1127,2294,2115,2293,1170,2295],"class_list":["post-8848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-companynews","category-news","tag-4h-sic","tag-micropipe-defects","tag-n-type-sic","tag-semi-insulating-sic","tag-sic-dislocations","tag-sic-doping","tag-sic-substrate-selection","tag-sic-wafer","tag-sic-wafer-specifications"],"acf":[],"uagb_featured_image_src":{"full":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC.webp",918,495,false],"thumbnail":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-150x150.webp",150,150,true],"medium":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-300x162.webp",300,162,true],"medium_large":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-768x414.webp",768,414,true],"large":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC.webp",800,431,false],"1536x1536":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC.webp",918,495,false],"2048x2048":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC.webp",918,495,false],"trp-custom-language-flag":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-18x10.webp",18,10,true],"woocommerce_thumbnail":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-300x300.webp",300,300,true],"woocommerce_single":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-600x324.webp",600,324,true],"woocommerce_gallery_thumbnail":["https:\/\/www.sic-wafers.com\/wp-content\/uploads\/2026\/04\/4H-SiC-vs-6H-SiC-vs-3C-SiC-100x100.webp",100,100,true]},"uagb_author_info":{"display_name":"lydia","author_link":"https:\/\/www.sic-wafers.com\/fr\/author\/lydia\/"},"uagb_comment_info":1,"uagb_excerpt":"1. Introduction Silicon carbide (SiC) has become a cornerstone material in power electronics, RF devices, and harsh-environment applications due to its wide bandgap, high thermal conductivity, and exceptional breakdown field. However, unlike silicon, SiC wafer selection is highly non-trivial. Subtle differences in polytype, doping, and defect density can directly determine device performance, yield, and long-term\u2026","_links":{"self":[{"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/posts\/8848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/comments?post=8848"}],"version-history":[{"count":1,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/posts\/8848\/revisions"}],"predecessor-version":[{"id":8850,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/posts\/8848\/revisions\/8850"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/media\/8849"}],"wp:attachment":[{"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/media?parent=8848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/categories?post=8848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sic-wafers.com\/fr\/wp-json\/wp\/v2\/tags?post=8848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}