{"id":7709,"date":"2026-02-06T09:00:00","date_gmt":"2026-02-06T09:00:00","guid":{"rendered":"https:\/\/www.keylinktech.com\/?p=7709"},"modified":"2026-03-02T08:07:27","modified_gmt":"2026-03-02T08:07:27","slug":"how-does-plasma-cleaning-improve-the-reliability-of-semiconductor-devices","status":"publish","type":"post","link":"https:\/\/www.keylinktech.com\/tr\/plasma-surface-technology\/application\/how-does-plasma-cleaning-improve-the-reliability-of-semiconductor-devices\/","title":{"rendered":"GaN ve Ga\u2082O\u2083 Cihazlar\u0131 i\u00e7in Plazma Y\u00fczey Temizli\u011fi: Temas G\u00fcvenilirli\u011fini ve Termal Kararl\u0131l\u0131\u011f\u0131 Art\u0131rma"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Yar\u0131 iletken y\u00fczeylerin plazma ile temizlenmesi, geleneksel i\u015flemlerin neden oldu\u011fu termal hasar olmadan, d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda GaN ve Ga\u2082O\u2083&#039;ten do\u011fal oksitleri, karbon kirlili\u011fini ve serbest ba\u011flar\u0131 gidererek ohmik temas direncini ve cihaz g\u00fcvenilirli\u011fini art\u0131r\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Y\u00fczey Haz\u0131rl\u0131\u011f\u0131n\u0131n Kimsenin Bahsetmedi\u011fi Bir Darbo\u011faz Olmas\u0131n\u0131n Nedenleri<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GaN ve Ga\u2082O\u2083 hakl\u0131 nedenlerle b\u00fcy\u00fck ilgi g\u00f6r\u00fcyor. GaN&#039;nin 3,4 eV bant aral\u0131\u011f\u0131 ve Ga\u2082O\u2083&#039;\u00fcn daha geni\u015f 4,5 ila 5,3 eV aral\u0131\u011f\u0131, onlar\u0131 y\u00fcksek g\u00fc\u00e7 ve y\u00fcksek frekans uygulamalar\u0131 i\u00e7in silikondan farkl\u0131 bir lige ta\u015f\u0131yor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Daha y\u00fcksek k\u0131r\u0131lma gerilimleri, daha d\u00fc\u015f\u00fck a\u00e7\u0131k diren\u00e7, y\u00fcksek s\u0131cakl\u0131klarda daha iyi verimlilik \u2014 performans a\u00e7\u0131s\u0131ndan durum gayet iyi kan\u0131tlanm\u0131\u015ft\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00dcretim s\u0131ras\u0131nda y\u00fczeyde neler oldu\u011funa daha az dikkat ediliyor. Epitelyal b\u00fcy\u00fcme ve cihaz i\u015fleme, metalin yar\u0131 iletkenle bulu\u015ftu\u011fu aray\u00fczde do\u011fal oksitler, karbon kal\u0131nt\u0131lar\u0131 ve oksijen kirlili\u011fi b\u0131rak\u0131yor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ta\u015f\u0131y\u0131c\u0131lar\u0131 da\u011f\u0131t\u0131rlar, temas direncini art\u0131r\u0131rlar ve Schottky bariyer y\u00fcksekli\u011fini y\u00fckselterek, malzemenin kalitesi ne kadar iyi olursa olsun cihaz\u0131 s\u0131n\u0131rlayan etkiler yarat\u0131rlar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Islak kimyasal temizlik, g\u00f6r\u00fcn\u00fcrdeki kirlili\u011fi giderir ancak y\u00fczeydeki kirleri ve gev\u015fek ba\u011flar\u0131 geride b\u0131rak\u0131r. Bunlar, cihazlar\u0131n belirtilen \u00f6zelliklerinin alt\u0131nda performans g\u00f6stermesine ve olmas\u0131 gerekenden daha h\u0131zl\u0131 bozulmas\u0131na neden olur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>13.56MHz RF Plazman\u0131n Y\u00fczeye Ger\u00e7ekte Ne Yapt\u0131\u011f\u0131<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">13,56 MHz&#039;lik bir radyo frekansl\u0131 vakum sistemi, iyon yo\u011funlu\u011funun ve iyon enerjisinin ba\u011f\u0131ms\u0131z olarak ayarlanabildi\u011fi bir plazma \u00fcretir. \u00d6nemli olan bu ba\u011f\u0131ms\u0131z kontrold\u00fcr. Kirletici ba\u011flar\u0131n\u0131 k\u0131rmak ve y\u00fczey par\u00e7ac\u0131klar\u0131n\u0131 yerinden oynatmak i\u00e7in yeterli enerjiyi ayarlayabilirsiniz, ancak hasara yol a\u00e7acak kadar derine inmezsiniz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Y\u00fczeyde ayn\u0131 anda iki \u015fey olur:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kimyasal reaksiyon: <\/strong>Radikal t\u00fcrler, kirletici ba\u011flar\u0131na do\u011frudan sald\u0131rarak onlar\u0131, hazneden d\u0131\u015far\u0131 \u00e7ekilen u\u00e7ucu yan \u00fcr\u00fcnlere d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.<\/li>\n\n\n\n<li><strong>Fiziksel p\u00fcsk\u00fcrtme: <\/strong>\u0130yon bombard\u0131man\u0131, kimyasal temizlemenin ula\u015famad\u0131\u011f\u0131 yerleri, \u00f6zellikle \u0131slak temizlemenin eri\u015femedi\u011fi y\u00fcksek en-boy oranl\u0131 detaylar\u0131n i\u00e7ini temizler.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">GaN temizli\u011fi i\u00e7in, azot bazl\u0131 veya Ar\/H\u2082 plazma, termal y\u00f6ntemlerin gerektirdi\u011finden \u00e7ok daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda do\u011fal galyum oksit ve karbon kirlili\u011fini giderir. GaN y\u00fcksek s\u0131cakl\u0131klara iyi dayanmaz, bu nedenle bu durum g\u00f6r\u00fcnd\u00fc\u011f\u00fcnden daha \u00f6nemlidir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Galyum oksit plazma i\u015fleminde, d\u00fc\u015f\u00fck g\u00fc\u00e7l\u00fc argon plazmas\u0131, Ga\u2082O\u2083 y\u00fczeyine kontroll\u00fc oksijen bo\u015fluklar\u0131 ekler. Bu bo\u015fluklar elektron iletimini iyile\u015ftirir ve <a href=\"https:\/\/www.keylinktech.com\/tr\/application-solutions\/wettability-improvement-2\/\" target=\"_blank\" rel=\"noreferrer noopener\">temas direnci<\/a> a\u015fa\u011f\u0131.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keylink&#039;in VL-10-A vakum plazma sistemi, 10 ile 100 Pa aras\u0131nda \u00e7al\u0131\u015fma vakumuyla 13,56 MHz RF frekans\u0131nda \u00e7al\u0131\u015f\u0131r ve O\u2082, Ar, H\u2082, N\u2082, CF\u2084 ve di\u011fer proses gazlar\u0131n\u0131 destekler. Ayn\u0131 platform, donan\u0131m\u0131 yeniden yap\u0131land\u0131rmaya gerek kalmadan hem GaN hem de Ga\u2082O\u2083 haz\u0131rlama i\u015flemlerini ger\u00e7ekle\u015ftirir. <a href=\"https:\/\/www.keylinktech.com\/tr\/plasma-surface-treatment-systems\/product-introduction\/plasma-surface-treatment-machine\/\" target=\"_blank\" rel=\"noreferrer noopener\">tam vakum plazma sistemi yelpazesi<\/a> Farkl\u0131 \u00fcretim gereksinimleri i\u00e7in ek yap\u0131land\u0131rmalar\u0131 kapsar.<\/p>\n\n\n\n<style>\n  .product-card {\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    height: 400px;\n    border: 1px solid #ddd;\n    border-radius: 10px;\n    overflow: hidden;\n    box-shadow: 0 4px 10px rgb(0 0 0 \/ 0.1);\n    max-width: 900px;\n    margin: 0 auto;\n    gap: 40px;\n    padding: 20px;\n    box-sizing: border-box;\n  }\n\n  .product-left,\n  .product-right {\n    flex: 1 1 50%;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    align-items: center;\n    text-align: center;\n  }\n\n  .product-left {\n    gap: 20px;\n  }\n\n  .product-title {\n    font-size: 26px;\n    font-weight: 700;\n    color: #158462;\n    margin: 0;\n  }\n\n  .product-button {\n    background-color: transparent;\n    color: #158462;\n    border: 2px solid #158462;\n    padding: 12px 24px;\n    font-size: 15px;\n    border-radius: 6px;\n    cursor: pointer;\n    transition: transform 0.3s ease;\n    text-decoration: none;\n    display: inline-block;\n  }\n\n  .product-button:hover {\n    transform: scale(1.1);\n  }\n\n  .product-right img {\n    max-width: 100%;\n    max-height: 360px;\n    object-fit: contain;\n    border-radius: 10px;\n  }\n\n  @media (max-width: 768px) {\n    .product-card {\n      flex-direction: column;\n      height: auto;\n      padding: 15px;\n      gap: 15px;\n    }\n\n    .product-left,\n    .product-right {\n      flex: none;\n      width: 100%;\n      text-align: center;\n    }\n\n    .product-right img {\n      max-height: 300px;\n      margin-bottom: 15px;\n    }\n\n    .product-left {\n      order: 2;\n      gap: 10px;\n      align-items: center;\n    }\n\n    .product-right {\n      order: 1;\n    }\n  }\n<\/style>\n\n<div class=\"product-card\">\n  <div class=\"product-right\">\n    <img decoding=\"async\" src=\"https:\/\/www.keylinktech.com\/wp-content\/uploads\/2025\/08\/VL-10-A-Vacuum-Plasma-Treatment-System-1.webp\" alt=\"VL-10-A\" \/>\n  <\/div>\n  <div class=\"product-left\">\n    <span class=\"product-title\"><strong>VL-10-A Vakum Plazma Ar\u0131tma Sistemi<\/strong><\/span>\n    <a href=\"https:\/\/www.keylinktech.com\/tr\/product\/vl-10-a-vaccuum-plasma-surface-treatment-system\/\" target=\"_blank\" class=\"product-button\">Daha Fazla Detay<\/a>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Bu Malzemeler \u0130\u00e7in Is\u0131l \u0130\u015flemde Ya\u015fanan Sorun<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Is\u0131l tavlama silikon i\u00e7in yeterince iyi sonu\u00e7 verir. Ancak GaN ve Ga\u2082O\u2083 i\u00e7in \u00e7\u00f6zd\u00fc\u011f\u00fcnden daha fazla sorun yarat\u0131r.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"wp-block-paragraph\">GaN&#039;den do\u011fal oksitlerin termal olarak uzakla\u015ft\u0131r\u0131lmas\u0131, GaN&#039;nin ayr\u0131\u015fmaya ba\u015flad\u0131\u011f\u0131 noktay\u0131 a\u015fan 850\u00b0C&#039;nin \u00fczerindeki s\u0131cakl\u0131klar\u0131 gerektirir. H\u0131zl\u0131 termal tavlama, bu cihazlar\u0131 kullan\u0131\u015fl\u0131 k\u0131lan heteroyap\u0131 aray\u00fczlerini bulan\u0131kla\u015ft\u0131ran gerilim olu\u015fturur. Katk\u0131 maddeleri, olmamas\u0131 gereken yerlerde yay\u0131l\u0131r.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"722\" height=\"627\" src=\"https:\/\/www.keylinktech.com\/wp-content\/uploads\/2026\/03\/AESXPS-Energy-Dispersive-Spectra-Comparison-Chart-of-GaN-and-Ga\u2082O\u2083.webp\" alt=\"\" class=\"wp-image-7712\" srcset=\"https:\/\/www.keylinktech.com\/wp-content\/uploads\/2026\/03\/AESXPS-Energy-Dispersive-Spectra-Comparison-Chart-of-GaN-and-Ga\u2082O\u2083.webp 722w, https:\/\/www.keylinktech.com\/wp-content\/uploads\/2026\/03\/AESXPS-Energy-Dispersive-Spectra-Comparison-Chart-of-GaN-and-Ga\u2082O\u2083-300x261.webp 300w, https:\/\/www.keylinktech.com\/wp-content\/uploads\/2026\/03\/AESXPS-Energy-Dispersive-Spectra-Comparison-Chart-of-GaN-and-Ga\u2082O\u2083-14x12.webp 14w, https:\/\/www.keylinktech.com\/wp-content\/uploads\/2026\/03\/AESXPS-Energy-Dispersive-Spectra-Comparison-Chart-of-GaN-and-Ga\u2082O\u2083-600x521.webp 600w\" sizes=\"(max-width: 722px) 100vw, 722px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ga\u2082O\u2083&#039;\u00fcn kendine \u00f6zg\u00fc bir hassasiyeti vard\u0131r. Stokiyometrisi, \u00f6zellikle oksijen bo\u015flu\u011fu konsantrasyonu, elektriksel davran\u0131\u015f\u0131n\u0131 belirler. Y\u00fcksek s\u0131cakl\u0131kta i\u015fleme, bunun \u00fczerinde hassas kontrol sa\u011flamaz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u00fc\u015f\u00fck s\u0131cakl\u0131kl\u0131 plazma i\u015fleme, t\u00fcm bu sorunlar\u0131 ortadan kald\u0131r\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Is\u0131 b\u00fct\u00e7esi d\u00fc\u015f\u00fck kald\u0131\u011f\u0131 i\u00e7in katk\u0131 maddesi profilleri yerle\u015ftirildikleri yerde kal\u0131r.<\/li>\n\n\n\n<li>Farkl\u0131 termal genle\u015fmenin katmanlar aras\u0131nda gerilim olu\u015fturmamas\u0131 nedeniyle, heteroyap\u0131 aray\u00fczleri bozulmadan kal\u0131r.<\/li>\n\n\n\n<li>Nanoyap\u0131lar ve y\u00fcksek en-boy oranl\u0131 \u00f6zellikler, i\u015flemde zarar verici \u0131s\u0131 kullan\u0131lmad\u0131\u011f\u0131 i\u00e7in korunur.<\/li>\n\n\n\n<li>GaN \u00fczerindeki Ga\/N oran\u0131, temiz ohmik davran\u0131\u015f i\u00e7in gerekli olan 1,0 \u00b1 0,04 aral\u0131\u011f\u0131nda kalmaktad\u0131r.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ohmik Temas \u0130yile\u015ftirme ve Yonga Y\u00fczeyi Aktivasyonu<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Y\u00fczeyi d\u00fczg\u00fcnce temizleyin, temas performans\u0131 da buna ba\u011fl\u0131 olarak iyile\u015fir. Ohmik temas iyile\u015fmesi, ak\u0131m\u0131n iyi tan\u0131mlanm\u0131\u015f bir metal-yar\u0131iletken ba\u011flant\u0131s\u0131ndan ge\u00e7mek yerine yal\u0131t\u0131m katmanlar\u0131ndan t\u00fcnellemesine neden olan do\u011fal oksitlerin ve y\u00fczey durumlar\u0131n\u0131n giderilmesinden kaynaklan\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plazma y\u00fczey haz\u0131rlama y\u00f6nteminden elde edilen ba\u015fl\u0131ca sonu\u00e7lar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ar\/Cl\u2082 plazmas\u0131yla i\u015flem g\u00f6rm\u00fc\u015f Ga\u2082O\u2083 cihazlar\u0131n\u0131n temas direnci, i\u015flem g\u00f6rmemi\u015f \u00f6rneklere k\u0131yasla iki kattan fazla azalm\u0131\u015ft\u0131r.<\/li>\n\n\n\n<li>Uzaktan NH\u2083 plazmas\u0131yla i\u015flem g\u00f6rm\u00fc\u015f GaN HEMT&#039;lerde \u00e7\u0131k\u0131\u015f ak\u0131m\u0131nda 20 ila 30% aras\u0131nda bir art\u0131\u015f g\u00f6zlemlenirken, ak\u0131m d\u00fc\u015f\u00fc\u015f\u00fcnde ve ge\u00e7it ka\u00e7a\u011f\u0131nda \u00f6l\u00e7\u00fclebilir bir iyile\u015fme sa\u011flanm\u0131\u015ft\u0131r.<\/li>\n\n\n\n<li>Ar plazma \u00f6n i\u015flemiyle haz\u0131rlanan Ga\u2082O\u2083 FET&#039;ler, metalizasyon sonras\u0131 tavlama i\u015flemine gerek kalmadan y\u00fcksek performans \u00f6zelliklerine ula\u015f\u0131r.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.keylinktech.com\/tr\/application-solutions\/activation\/\" target=\"_blank\" rel=\"noreferrer noopener\">Yonga y\u00fczeyi aktivasyonu<\/a> Ayn\u0131 zamanda metalizasyona giden stokiyometriyi de kontrol eder. HEMT ve Schottky bariyer diyot \u00fcretiminde, aray\u00fczdeki bu hassasiyet, elektriksel karakterizasyondan ge\u00e7en cihazlar\u0131 ge\u00e7emeyenlerden ay\u0131ran en \u00f6nemli fakt\u00f6rd\u00fcr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keylink, t\u00fcm sekt\u00f6rlerde ayn\u0131 aktivasyon prensiplerini uygular. Kayna\u011f\u0131m\u0131zda \u015funlar yer almaktad\u0131r: <a href=\"https:\/\/www.keylinktech.com\/tr\/plasma-surface-technology\/process\/plasma-cleaning\/plasma-cleaning-improves-paint-adhesion-on-smartphone-housings\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ak\u0131ll\u0131 telefon g\u00f6vdesi yap\u0131\u015fma sorunlar\u0131 i\u00e7in plazma temizleme<\/a> Bu, y\u00fczey aktivasyonunun farkl\u0131 malzemelerde nas\u0131l \u00f6l\u00e7\u00fclebilir sonu\u00e7lara d\u00f6n\u00fc\u015ft\u00fc\u011f\u00fcn\u00fc g\u00f6stermektedir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Bu, Bile\u015fik Yar\u0131 \u0130letkenlerin Uzun Vadeli G\u00fcvenilirli\u011fi \u0130\u00e7in Ne Anlama Geliyor?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir cihaz\u0131n ilk testte belirtilen \u00f6zelliklere uygun olmas\u0131 bir \u015feydir; sonraki \u00fcretim a\u015famalar\u0131nda, paketleme stresinde ve y\u0131llarca s\u00fcren \u00e7al\u0131\u015fmada bu \u00f6zelli\u011fi korumak ise bamba\u015fka bir \u015feydir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plazma ile haz\u0131rlanan y\u00fczeyler, termal i\u015flem g\u00f6rm\u00fc\u015f y\u00fczeylere g\u00f6re daha p\u00fcr\u00fczs\u00fcz ve kimyasal olarak daha kararl\u0131d\u0131r. Elektriksel performans\u0131 kademeli olarak d\u00fc\u015f\u00fcren, sonraki i\u015flemler s\u0131ras\u0131nda olu\u015fan kusur durumlar\u0131n\u0131 geli\u015ftirmezler. Otomotiv invert\u00f6rlerinde, 5G baz istasyonlar\u0131nda ve end\u00fcstriyel g\u00fc\u00e7 d\u00f6n\u00fc\u015ft\u00fcrmede kullan\u0131lan GaN ve Ga\u2082O\u2083 cihazlar\u0131 i\u00e7in, bile\u015fik yar\u0131 iletkenlerin zaman i\u00e7indeki g\u00fcvenilirli\u011fi iste\u011fe ba\u011fl\u0131 de\u011fil, bir yeterlilik \u015fart\u0131d\u0131r. Bile\u015fik yar\u0131 iletken uygulaman\u0131z i\u00e7in vakum plazma \u00e7\u00f6z\u00fcmlerini g\u00f6r\u00fc\u015fmek \u00fczere bizimle ileti\u015fime ge\u00e7in.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-vivid-green-cyan-background-color has-background wp-element-button\" href=\"https:\/\/www.keylinktech.com\/tr\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u00dccretsiz Teklif Al\u0131n<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Plasma cleaning semiconductor surfaces removes native oxides, carbon contamination, and dangling bonds from GaN and Ga\u2082O\u2083 at low temperatures, improving ohmic contact resistance and device reliability without the thermal damage that traditional processing causes. Why Surface Preparation Is the Bottleneck Nobody Talks About GaN and Ga\u2082O\u2083 get a lot of attention for the right reasons. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":7711,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95],"tags":[],"class_list":["post-7709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Plasma Cleaning for GaN &amp; Ga2O3 Device Reliability | KEYLINK<\/title>\n<meta name=\"description\" content=\"Discover how plasma cleaning improves ohmic contact in GaN and Ga\u2082O\u2083 devices. 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