TWI273141B - Sputtering target, optical information recording medium and method for producing same - Google Patents

Sputtering target, optical information recording medium and method for producing same Download PDF

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TWI273141B
TWI273141B TW094108586A TW94108586A TWI273141B TW I273141 B TWI273141 B TW I273141B TW 094108586 A TW094108586 A TW 094108586A TW 94108586 A TW94108586 A TW 94108586A TW I273141 B TWI273141 B TW I273141B
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Taiwan
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recording medium
information recording
optical information
sputtering target
film
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TW094108586A
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TW200540286A (en
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Hideo Takami
Masataka Yahagi
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Nippon Mining Co
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    • GPHYSICS
    • G11INFORMATION STORAGE
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    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
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    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/22Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
    • C03C17/23Oxides
    • C03C17/245Oxides by deposition from the vapour phase
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    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08Oxides
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34Sputtering
    • C23C14/3407Cathode assembly for sputtering apparatus, e.g. Target
    • C23C14/3414Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
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    • G11B7/242Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/266Sputtering or spin-coating layers
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    • C03C2217/213SiO2
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    • C03C2218/00Methods for coating glass
    • C03C2218/10Deposition methods
    • C03C2218/15Deposition methods from the vapour phase
    • C03C2218/154Deposition methods from the vapour phase by sputtering
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    • C04B2235/658Atmosphere during thermal treatment
    • C04B2235/6583Oxygen containing atmosphere, e.g. with changing oxygen pressures
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    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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Description

1273141 九、發明說明: 、【發明所屬之技術領域】 本發明係關於一種光資訊記錄媒體用薄膜(特別是作為 保護膜)及其製造方法以及可適用於該等之濺鍍把,該膜之 非晶質性安定、與記錄層之密合性、機械特性良好、透過 率高,且由於係以非硫化物系所構成,所以鄰接之反射層、 記錄層不易發生劣化。 鲁 【先前技術】 以往,於相變化型光資訊記錄媒體之保護層中一般主 要使用之ZnS-Sl〇2,由於其光學特性、熱特性、與記^層 之密合性等皆具有優異之特性,故廣泛地被使用。 • 但是,今曰以藍光(Blu卜Ray)為代表之覆寫型DVD, 被強烈要求增加覆寫次數、大容量化及高速記錄化。 光貧訊記錄媒體覆寫次數變少的原因之一,係因保護 a S Si〇2之硫成分擴散到由該保護層ZnS-Si02挾持之 攀記錄層材内。 又,為求大容量化、高速記錄化,而將具高反射率及 高熱傳導特性之純^或Ag合金使用於反射層材,該反射 層也與保護層材ZnS_Si〇2以鄰接的方式配置。 ^ 口此,此情形亦同樣的,會由於硫成分從ZnS-Si02擴 放出使純Ag或Ag合金反射層材腐蝕劣&,成為光資訊 記錄媒體之反射率等特性劣化的要因。 乍為防止。亥等硫成分擴散之對策,於反射層與保護層、 1273141 記錄層與保護層之間設置以氮化物或碳化物為主成分之中 間層。但,隨積層數之增加,會發生產能降低及成本增加 的問題。 為解決上述問題,當務之急係將保護層材取代為不含 硫化物而僅含氧化物之材料,並找出具有與ZnS — Si02同 等以上之光學特性及非晶質安定性。 因應此需求,氧化物系保護層材、透明導電材或光學 薄膜已被提出(參考專利文獻1〜3)。 但是,專利文獻1〜3有產生光學特性與非晶質性變差 區的問題。 專利文獻1:曰本特開平〇 1 _3 17167號公報 專利文獻2:日本特開2000-90745號公報 專利文獻3:曰本特開2003-166052號公報 【發明内容】 本發明係有關於一種光資訊記錄媒體用薄膜(特別是作 為保護膜)及其製造方法以及可適用於該等之濺鍍靶者,該 濺鍍膜之非晶質性安定、與記錄層之密合性、機械特性優 /、透過率鬲’且由於係以非硫化物系構成,故不易使鄰 接的反射層、記錄層產生劣丨,藉此,可大幅改善覆寫特 性等之光貧訊記錄媒體之特性。 為了解决上述課題,本發明人等經過努力研究結果發 現,將習知之保^ KL .1 i ο ο · 保邊層材ZnS-Si02取代為下述不含硫化物僅 含氧化物之分冰、丨 <何枓,可確保與ZnS_Si〇2具有同等之光學特性 1273141 並可改善覆寫特性等之光資訊記錄媒 基於以上發現,本發明提供:υ一種濺鍍靶,其特徵 為係由Υ2〇3、Al2〇3及Si〇2所構成;2)—種濺鍍靶,其 特徵為,係由丫2〇3:10〜60莫耳%、A12〇3:1〇〜4〇莫耳%及 30〜80莫耳%所構成;3)如前述”或2)之濺鍍靶,其相對 密度為95%以上。 ~ ’
以及非晶質安定性 體之特性。 又,本發明亦提供:4) 一種光資訊記錄媒體及其製造 方法,、其特徵為,係使用前& υ〜3)中任—項之濺鑛輕至 少形成薄膜,以作為光資訊記錄媒體構造之—部分;及5) 一種光資訊記錄媒體及其製造方法,其特徵為,係使用前 述1)〜3)中任一項之濺鍍靶至少形成薄膜,以作為光資= 記錄媒體構造之-部分,且該薄膜係配置成鄰接於記二 或反射層。 ' 由上所述,可提供一種光資訊記錄媒體用薄膜(特別是 作為保護層)及其製造方法以及適用於該等之濺鍛#,藉由 將以往之保護層材取代為不含硫化物僅含氧化物之材料, 可抑制鄰接之反射層、記錄層由於硫而劣丨,並且具備與
ZnS-Si〇2為同等以上之光學特性及非晶質安定性,且具有 與記錄層之密合性、機械特性優異、透過率高等優異特性。 又,猎由使用本材料系,具有可改善覆寫特性等之光 資訊記錄媒體特性之優異效果。特別是,由於可以提高短 波長側之透過率,而可適用於藍光雷射系之相變化記錄媒 體用保護層材。
(I 1273141 【實施方式】 本發明之濺鍍靶,係由以ίο。幻2〇3及si〇 :之材料所構成。形成玻璃之氧化物Si〇2可使非晶質: :。為了得到該效果,Sl〇2較佳為3〇莫耳%以上。'二 於若SK)2超過8G莫耳%,光學特性(折射率)會變差,故 了得到良好的特性’較佳為將上限定在8()莫耳%。 ’、、、 幻2〇3之添加,具有使燒結溫度降低的效果。藉由使 :、、。溫度下降,可以提高密度’而能使製造安定化。為了 達成該效果,Al2〇3較料1〇莫耳% 讲夕η士 a 1一疋 田添加 义夕I會使非晶質性變差、且熱傳導率變得過大,故Μ 較佳為控制於40莫耳%以下。剩餘部分為γ2〇3,即γ2〇3 車父L為定在1〇〜6〇莫耳%。 6藉此,可使濺餘之相對密度為95%以上,而能製造 安定之高密度濺鍍靶。 又,本發明,係使用上述之濺餘,可至少形成薄膜 則乍為光資訊記錄媒體構造之一部分。又,本發明之光資 訊記錄媒體及其製造方法,係使用本發明之濺㈣,至少 型成薄膜以作為光資訊記錄媒體構造之一部分,且該薄膜 係配置成鄰接於記錄層或反射層。 /材料光予特性及膜之非晶質性安定,而適用於相 變化型光記錄媒體之保護層材。成料係使用高頻錢鍍。 本材料,如上述由於非晶質性安定、可提高透過率, 故適用於覆寫速度快之相變化記錄媒體或藍光雷射系之相 1273141 變化記錄媒用保護層材。 又’本發明之濺鍍靶,相對密度可達95%以上。而密 度之提南,彳提昇賤鍍膜之均一十生,且具有抑制賤鑛時顆 粒產生之效果。 使用上述之濺鍍靶,可提供以該濺鍍靶至少形成薄膜 以作為光資訊媒體構造一部分之光資訊記錄媒體。 — 又,使用上述之濺鍍靶,可製作以該濺鍍靶至少形成 >專膜以作為光資訊媒體構造之一部分、且薄膜配置成鄰接 於兄錄層或反射層之光資訊記錄媒體。 使用本發明之濺鍍靶所形成之薄膜,係形成光資訊記 錄媒體構造之一部分且配置成鄰接於記錄層或反射層,但 如上述,由於未使用ZnS,故不會有s所造成之污染,硫 - 成分不會擴散到配置成以保護層挾持之記錄層材,而具有 , 防止記錄層劣化的顯著效果。 又,雖為求大容量化、高速記錄化而於反射層材使用 籲具有高反射率與高熱傳導性之純Ag《Ag合金,但亦不會 有硫成分擴散到鄰接之反射層,而同樣能防止反射層材^ 蝕劣化、光資訊記錄媒體之反射率等特性變差,具有優異 的效果。 本發明之濺鍍靶,可藉由將平均粒徑為5μηι以下之各 構成元素之氧化粉末於常溫燒結或高溫加壓燒結以製造。 藉此,可製得相對密度為95%以上之濺鍍輕。 於此場合,較佳為於燒結前將以氧化釔為主成分之氧 化物粉末先於1000〜1400°C進行預燒結。於預燒結後,粉 1273141 碎為3μιη以下你& & 卜作為繞結用原料。 〜 月特別具有添加Al2〇3的顯著特徵。如上所述, 库告由添力π A 1 — ’可具有降低燒結溫度的優異效果。 2〇3 Si〇2之2成分系於光學特性及非晶質性係良好, =有時若未將溫度提高I謂t以上則無法使密度充分提 N,而有難以安定製造的問題。本發明可將燒結溫度降至 600 C以下,而具有能滿足高密度、光學特性及非晶質性 等之顯著效果。 再者’藉由使用本發明之丨賤鍍乾,可提高生產性、並 製得品質良好的材料,而具有可安定地以低成本製作具光 碟保護膜之光記錄媒體的顯著效果。 本發明之濺鍍乾之密度提昇,可減少空洞孔並使結晶 粒微細化,使靶之濺鍍面均一且平滑,故可以減少濺鍍時 產生之顆粒或結球,更具有延長靶壽命的顯著效果,而能 減少品質偏差、提高量產性。 實施例 以下’依據實施例及比較例進行說明。又,本實施例 僅為一例,並未因此例而產生任何限制。亦即,本發明僅 為專利申請範圍所限制者,可包含實施例以外的各種變 形。 (實施例1〜4) 準備純度4N之5μηι以下的Si02粉、Υ2〇3粉及ai2〇3 粉,調配成表1所示組成,進行濕式混合、乾燥後,於丨丨〇〇 °C實施預燒結。然後,將預燒結之粉末以濕式微粉碎至平 1273141 均粒徑1 μιη左右後,添加結合劑並以喷霧乾燥機造粒。將 該造粒粉以低溫進行加壓成形,並於氧氣氣體環境氣氛(氣 流)中,以1200〜1600°C進行常壓燒結,再將此燒結材以機 械精加工為輕形狀。 實施例1〜4之燒結溫度分別為1400°C、1550°C、1250 °C、1400°C。又,若燒結溫度落於上述溫度範圍,則可燒 結為大致同等程度。 表1 例 組成 Y?03:Al203:Si02 T/P密度 透過率 405nm(%) 折射率405nm 非晶質性※1 實施例1 35:20:45 98 95 1.8 〇 實施例2 45:20:35 96 96 1.9 〇 實施例3 15:20:65 99 96 1.7 〇 實施例4 20:35:45 96 96 1.8 〇 比較例1 20:65:15 97 93 1.8 X 比較例2 5:5:90 94 98 1.5 〇 比較例3 85:5:10 75 98 2.1 Δ 比較例4 ZnS-20molSiO2 98 80 2.3 〇 ※工非晶質性,係在施加退火(600°c、氬環境氣氛、30分鐘)之成膜樣本之XRD測定下 20=20〜60°範圍中,以相對非成膜玻璃基板之最大峰值強度比表示。又,〇:1.0〜1.5, △:1·5〜2.0,χ:2·0 以上。
使用經上述精加工之大小為6吋φ之靶,進行濺鍍。 濺鍍條件,係設定為RF濺鍍、濺鍍功率1000W、Ar氣壓 0.5Pa,以1500人之目標膜厚進行成模。 成膜樣本之透過率(波長405nm)%、折射率(波長 405nm)、非晶質性(在施加退火(600°C、氬環境氣氛、30分 鐘)之成膜樣本之XRD測定下20 = 20〜60G範圍中,以相對 非成膜玻璃基板之最大峰值強度比)等之測定結果示於表 11 1273141 由以上之結果可發現,實施例1〜4之濺鍍靶相對密度 達到95上乂 μ 上’而可實施安定的RF濺鍍。 ;賤錢膜之透過率達到 95〜96%(405nm),折射率為 9且未觀察到特定之結晶峰,而具有安定的非晶質 性(1.0〜1·5) 〇 七又由於本發明之濺鍍靶未使用ZnS,故不會發生因 瓜之擴放、3染所造成之%資訊記錄媒體之特性劣化。且, 與後述比較助比,成《本之透料、折㈣、非晶質 之女疋性4皆顯示良好之值。 (比較例1〜4) 、依表1所不,準備與本發明條件不同之原料粉成分與 組成比之材料’特別是於比較例4中準備Μ原料粉,將 2溫度條件以15⑼〜1戰,除此之外,與實施例以 5 ’的條件製作乾’並使用該數形成$賤鍍膜。必較例1〜* 之燒結溫度’分別設定》165Gt、155代、Μ °c(以熱壓方式)。 υυ 結果亦示於表1。 脫 比較例 之結果 離本發明組成比條件之比較例其成分與組成,例如, 1’坏〇3過多,為60莫耳%,故為非晶質性不佳
Sl〇2多,無法取得 故無法取得平衡、 不佳之結果。 比較例2,由於γ2〇3及幻2〇3少 平衡,故折射率低於基準值。 比較例3由於丫2〇3太多,Si〇2少 且後、度無法充分地提高,而為機鑛特性 12 1273141 比較例4,雖然折射率高密度也高,但是含有多量ZnS, 為具有硫污染危險性的材料。且,透過率亦不佳。 使用本發明之濺鍍靶所形成之薄膜係形成光資訊記錄 媒體構造之一部分,且因未使用ZnS,故不會有硫成分擴 政至記錄層材中,而具有不會因硫而造成記錄層劣化之顯 者效果。又,當鄰接之反射層中使用具有高反射率及高熱 傳導特性之純Ag或Ag合金時,也不會有硫成分擴散至該 反射層’具有能防止反射層腐蝕劣化而抑制特性劣化之良 好效果。 再者’不僅非晶質性安定且可賦予靶導電性,可在較 -*度進行燒結而能安定地製造。又,可達成相對密度95% &之焉您度化’而能安定地進行RF濺鍍成膜。又,使 。鍍令易控制,能提高濺鍍效率,而具有之顯著效果,且 σ咸 > 成膜時濺鍍時產生之顆粒(塵埃)或結球、降低品質 ^ 面1產性’而能以低成本製造具光碟保護膜之光 吕己錄媒體。 【圖式簡單說明】 無 【主要元件符號說明】 無 13

Claims (1)

  1. 由 Y203、A1203 及 SiC 係 —禋濺鍍靶,其特
    1273141 十、申請專利範圍: 1·一種濺鍍靶,其特徵在於 所構成。 \±j I 2 U 3 ·丄以〜〇 以 Α12〇3:10〜40莫耳%及Si〇23〇〜8〇莫耳%所構成。 3.如申請專利範圍帛1項或第2項之濺鍍靶 密度為95%以上。 4.一種光資訊記錄媒體,其特徵在於,係使用申請專 利fe圍第1項〜第3項中任-項之賤鍍歡至少形成薄膜, 以作為光資訊記錄媒體構造之一部分。 5 · —種光資訊記錄媒體之製造方法,其特徵在於,係 使用申請專利範圍帛i項〜第3項中任—項之賤㈣至少 形成薄膜’以作為光資訊記錄媒體構造之一部分。 6.—種光資訊記錄媒體,其特徵在於,係使用申請專 利範圍第1項〜第3項中任一項之濺鍍靶至少形成薄^, 以作為光資訊記錄媒體構造之一部分,且該薄膜配置成鄰 接於記錄層或反射層。 7 · —種光資訊記錄媒體之製造方法,其特徵在於,乂 使用申請專利範圍第1項〜第3項中任一項之濺鍍乾至^ 形成薄膜,以作為光資訊記錄媒體構造之一部分,且該薄 膜配置成鄰接於記錄層或反射層。 Η•一、囷式:
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