TW313668B - - Google Patents

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Publication number
TW313668B
TW313668B TW086101352A TW86101352A TW313668B TW 313668 B TW313668 B TW 313668B TW 086101352 A TW086101352 A TW 086101352A TW 86101352 A TW86101352 A TW 86101352A TW 313668 B TW313668 B TW 313668B
Authority
TW
Taiwan
Prior art keywords
substrate
cold cathode
semiconductor wafer
mounting
fixing
Prior art date
Application number
TW086101352A
Other languages
English (en)
Original Assignee
Nippon Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Electric Co filed Critical Nippon Electric Co
Application granted granted Critical
Publication of TW313668B publication Critical patent/TW313668B/zh

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    • H—ELECTRICITY
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    • H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
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    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
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    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)

Description

經濟部中央標準局員工消費合作社印製 ^^3668 A7 B7 五、發明説明（1 ) 本發明係有關於基板上固接半導體晶片之方法及其結 構。 最近已有人開發出電子場致發射冷陰極以作爲電子餘 等的電子源。圖4係顯示出此電子場致發射冷陰極的剖 面。冷陰極30係，一般爲在半導體基板31上將數百個至 數萬個微小突起的射極32配置成圓形或正方形等形狀，藉 此以形成用來發射電子之發射區域33 ;爲了將強電場施Z 在微小突起的射極上，故介由絕緣層35而在射極32的上 方形成有閘電極34。 電子場致發射冷陰極係，當在閘電極34與射極32間 施加電壓時，電場會集中在射極32之尖尖的前端部，藉此 從射極32會發射出對應於自此頂點至兩電極間的電位差 又電子。當射極的微小突起之直徑爲！ " m，在射極& 與閘電極34間施加50〜100V電壓時，會有約！ " A之電 子自各射極發射出。因此，通常使用於陰極射線管之電子 場致發射冷陰極，雖然形成有數千〜數萬個微小突起的射 極，但由於1個射極之直徑小到丨"m，故所形成之發射 區域的大小爲數百"m見方。 圖5係顯示用來安裝電子場效發射冷陰極之電子鎗呤 極結構體的剖面圖。安裝著冷陰極41之套f 43被絕緣^ 44固定在外側陰極支持體45上。4〇代表接線，ο代表^ 陰極的發射區域，49代表接續埠。又，46代表第】拇極， 47代表第2柵極。且，由於電子鎗之特性係藉由冷陰極μ 的發射區域42與第i柵極46之位置關係的精度以決 本紙張尺度朝巾®®丨;（GNS) A4· ( 21Qx297公楚- ---------^! 1 - (請先閲讀背面之注意事項再填寫本頁) 訂 .I I -1 - In 經濟部中央標準局員工消費合作社印製 A7 _______B7 五、發明説明（2 ) " --- 出，故前述位置關係之精度必須要求爲高精度。 接著使用特開平7_161304號公叔所揭示出之技術以 説明習知之使用冷陰極的陰極結構體。圖6(a)係特開平7_ 161304號公報之陰極結構體的斜視圖；圖6(b)係a a,線的 剖面圖。陰極構造體50具有頂面形成有窗孔51之帽狀的 晶片固定具52 ;電子場效發射冷陰極係，其發射區域53 由此晶片固定具S2的窗孔露出，其接觸區域54係固定 成與窗孔51之裡面周緣部相接觸。如圖6所示般，電子場 致發射冷陰極係藉由彈性接續片61而抵壓在晶片支持具 52上。此習知例之特徵在於，冷陰極與閘電極間之接續未 使用配線，而是採用將冷陰極抵壓在晶片支持具上。 接著使用圖7以説明陰極射線管的構造。由陰極結構 體71之冷陰極所發射之電子束78係，經由配置在陰極結 構體71的對面之由第丨〜第6柵極構成之電子鎗72的電子 透鏡以進行聚焦，當通過遮蔽罩73後，最後衝擊至螢光幕 77而發出所望之色。用來構成螢光幕77的各色之各個畫 .T、之螢光體點之典型大小爲直徑丨〇〇 " m，故電子束78 形成在螢光幕77上之點徑必須具有可同時照射複數個螢 光體單元之大小。 又’在大型陰極射線管中，由於在陰柘射線管端面具 有球面相差之問題，故電子束之點徑會有變大的傾向，因 此必須使得點徑更加微小化。因此，電子透鏡之組合精度 會變知相當南’由數"m至1 m。亦即，電子鎗之組 裝精度必須限定在電子束的聚焦分布及螢光面的位置分布 ^------1T------1 4 » - · (請先閱讀背面之注意事項再填寫本頁) 5 經濟部中央標準局員工消費合作社印製 〇136β8 A7 B7五、發明説明（3 ) 可容許之範圍内。 此處之重點在於，在使用冷陰極之電子鎗中，聚焦至 螢光體單元之像爲冷陰極的發射區域之點光源像。因此， 冷陰極之安裝在垂直於電子束行進方向的平面上之安裝位 置精度係直接反映螢光體單元之位置精度。因此，冷陰極 單元之安裝位置必須具有相當高的精度。 接著，説明習知技術之高精度地安裝矽晶片等微小元 件之方法。如圖8所示般，特開平4-221865號公報爲揭示 出矽晶片等微小元件的固定方法之技術。此方法爲，在安 裝、固定複數個微小元件時，不用對各個微小元件進行位 置對準，而可自動進行位置對準的技術。其在形成於基板 81上之凸部82的上端面及微小元件83的下端面塗布具有 良好的銲材潤濕性之塗布材。接著介由銲材84而將微小元 件83設置在基板凸部82的上端面。當藉由加熱以溶融銲 材84時，基於銲材84之表面張力，微小元件83會與基板 凸部82相接合，藉此以將微小元件83銲在既定位置上。 此習知例中，藉由基板凸部82的外形大小、微小元件83 的外形大小、基板凸部82對於銲材84的表面張力之面分 布、微小元件83對於銲材84的表面張力之面分布以高精 度地決定出最終微小元件83的位置。 接著，如圖9(a)、（b)所示般，特開平1-108734號公報 揭示出可防止銲材所含之焊劑或氣體流至配線固定部之技 術，藉此以避免固著部的機械強度、電氣特性、熱安定性 之劣化。其在金屬基底91下部設置開口部92，藉由絕缘 ----------裝-------訂------1给 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐）
材93以將引線96固定在開口部92上。引線96係，藉由 銲材97以接續在印刷配線板94上。由於銲材中所含之銲 劑或氣體對於晶片95及配線98會產生不佳的影響，故形 成有堤99以防止銲劑流失至晶片95及配線％。又，習知 之如圖10(a)、（b)所示般之形成元件嵌合突起部以進行定 位之技術已廣爲人知。其爲當晶片1〇2安裝固定在圖1〇中 叉基板101上時，藉由將晶片1〇2之2個面抵接在突起部 103上以提高安裳位置的精度。 本發明所要解決之問題爲，有關使用冷陰極的電子鎗 之構造及其製造方法之以下數點。亦即，⑴必須將冷陰極 的安裝位置在士數"m之精度下固定在既定的位置；（幻在 固足凡件後，就算使用玻璃在玻璃轉移溫度以下之高熱（最 鬲550 °C)下將電子鎗封入陰極射線管時，亦不致造成安裝 位置的精度之劣化。 首先，説明基本事項之用來形成冷陰極的一般矽晶片 的尺寸A度。秒晶片係藉由切割妙晶圓等方法以得出者。 經由切割之晶片外形尺寸精度至多爲±數十"m，面對面 的平行面<精度至多爲】8〇±5度。此乃基於切割時所使用 又切割刀切在割晶圓時之產生磨耗所造成之厚度變薄、初 期之切割位置對準時所使財光學顯微鏡的精度、切割裝 置的機械精度等以決定出。 因此，如用來説明習知例之圖8及圖〗〇所示般，會產 生曰曰片的外形尺寸精度直接反映晶片安裝位置精度之缺 點。且，在圖8之習知例中，除了晶片之尺寸精度外，由 7 經濟部中央標準局員工消費合作社印製 313668 A7 B7五、發明説明（5 ) 於所使用的銲材對於基板側及晶片内面側之潤濕性形成平 均分布，故凸部與晶片之中心不易形成一致，因此會產生 安裝位置精度比晶片外形尺寸精度更差之問題點。 又，用來將冷陰極接著在陰極結構體的基板之銲材之 代表性者爲共晶合金（Eutectic Alloy)，可舉金妙共晶合金 爲例，其溶融溫度爲430 °C。將電子鎗封入陰極射線管時 的溫度爲比金矽共晶合金的融點還高之550 °C。因此，在 用玻璃封止時，就算高精度地安裝著冷陰極，由於銲材之 金秒共晶合金會溶融，故會造成冷陰極的移動，如此將產 生位置精度劣化之問題。 又，其他安裝晶片之方法可舉金-金熱壓著法爲例。此 時，由於金與妙之界面會產生合金化，故在玻璃封止時的 550 °C附近安裝材會溶融，因此也會產生安裝精度劣化之 問題。 另一方面，當使用融點爲550 °C以上之高融點的共晶 合金作爲安裝材時，會產生以下之問題。亦即，（1)由於銀 銲材等含有相當多的銲劑等雜質，故不適於用來安裝半導 體晶片；（2)當溶融溫度超過600 °C以上時，基於用來安裝 之金屬基板與晶片之熱膨脹係數差，在安裝完成後之冷卻 時會造成安裝位置的移動，故會導致安裝精度之劣化；（3) 爲了加熱至600 °C以上，若不將環境氣體中的氧濃度抑制 到相當低，則元件受到傷害的可能性相當大。 本發明之目的爲提供一種基板上固接半導體晶片之方 法及其結構，以安裝精度佳地將半導體晶片固接在基板 ---------裝------訂-----1線 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家揉準（CNS )八4規格（210 X 297公釐） 經濟部中央標準局員工消費合作社印製 A7 B7五、發明説明（6 ) 上。 、 本發明係提供一種基板上固接冷陰極之結構；該冷陰 極爲電子場致發射冷陰極，具有：發射部，具備多數個形 成於半導體基板上之導電性物質所構成之微小突起；及閘 極部，介由絕緣膜而形成在前述半導體基板上；其特徵在 於，使用安裝材以將前述冷陰極安裝在前述基板上，且藉 由無機接著劑以固定冷陰極的周邊，該無機接著劑之硬化 溫度較前述安裝所使用之安裝材的硬化溫度爲低。 本發明係提供一種基板上固接冷陰極之方法；該冷陰 極爲電子場致發射冷陰極，具有：發射部，具備多數個形 成於半導體基板上之導電性物質所構成之微小突起；及閘 極部，介由絕緣膜而形成在前述半導體基板上；其特徵在 於，具備：使用安裝材以將前述冷陰極安裝在前述基板的 既定位置上之步驟；使用無機接著劑以固定冷陰極的周邊 之步驟；該無機接著劑之硬化溫度較前述安裝步驟所使用 之安裝材的硬化溫度爲低。 參照圖面以説明本發明。圖1(a)係顯示本發明的第1 實施形態之陰極結構體的上視圖；圖1(b)係顯示A-A’線剖 面圖。接著説明陰極結構體的構造及製造方法，亦即安裝 順序。將陰極結構體的基板1裝設在安裝裝置上，該安裝 裝置具備用來檢知位置對準記號之CCD攝影機、及用來基 於該攝影機之輸出値以算出安裝位置之電腦，藉此以檢知 出基板1的2個位置對準記號，並算出冷陰極2的中心位 置。接著檢知出冷陰極2的位置對準圖形6，並計算出冷 ---------L .— _____I 丁_____一 泉 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐） 經濟部中央標準局員工消費合作社印製 五、發明説明（7 ) 陰極2的中心位置。接著，將冷陰極2及銲材3移動並安 裝在基板1的既定位置上。特別是，在此實施形態中，鲜 材J及冷陰極2被安裝成使得發射區域7對準既定之位 置’例如基板1的中心位置。將基板i及冷陰極2保持在 此狀態下加熱至既定溫度。由於所使用之金秒共晶合金鮮 材會在430 C左右溶融，故加熱至43〇 左右。接著當金 矽共晶合金溶融後，暫時將基板1及冷陰極2保持在I狀 態下一陣子’以使其冷卻之。在冷卻後，在冷陰極的周圍 f布無機_ 4。無機接著劑可使用例如—c 製< AZ-120或東亞合成化學製之一贿ic d等。接著 將基板1及冷陰極2加熱至無機接著癌 «rm 顺《丨4的硬化溫度（150 二成加熱後，將其冷部。依據以上的順序， 冷陰極2會被安裝在_結構體的基板i h定位置上。 ^圖5所讀，電子鎗之例爲，使用稱爲套筒u之圓 柱狀的金屬體以作爲陰極結構體的基板。套筒㈣介由絕 2 44以固定在外側陰極支持體化上，藉此以形成陰極 結構體。此陰極結構體被安裝成使得其與第！树極从及其 與第2_47_對位置之精度板佳。例如精度爲+ 1〇" m以下。因此，冷陰極41之用來發射電子東⑼之稱作發 射區域42與第！柵極46及其與第2_47之間位置精度 保持於既定之高精度下。 如圖7所示般，電子鎗被封止在坡璃製之陰極射線管 74内。此時，由於玻璃的融點高到6〇〇。〇以上，故安裝有 冷陰極之陰極結構體71附近之溫度亦會上昇至55〇<；(：。在 本紙張尺度適用中國國家標隼（CNS ) A4规格（210X 297公釐） 丨裝------訂-----1—線 ' · (請先聞讀背面之注意事項再填寫本頁) A7 B7
經濟部中央標準局員工消費合作社印製 五、發明説明（8) 此實施形態中，由於使用在550 °C之溫度下仍可維持硬化 之無機接著劑固定冷陰極的外周部，故不致產生冷陰極之 位移。被封止的陰極射線管在排氣步驟時，一面在400 °C 下加熱2小時同時由排氣管排放出内部的不純氣體。完成 排氣後封止排氣管75。 圖2係顯示出本發明的第2形態。圖2(a)係冷陰極組 裝在陰極結構體的基板上之上視圖；圖2(b)係2(a)圖中 A-A’線剖面圖。此實施形態中，冷陰極2安裝在陰極結構 體的基板1上之後，將無機接著劑4斷續地塗布在至少6 個點以上，藉此以固定冷陰極。此實施形態中，由於斷續 地塗布無機接著劑，因此可分散基於矽、金及無機接著劑 間之熱膨脹係數的不同所造成之應變（Stiain)，故可減輕對 於矽所造成之傷害。 圖3(a)、（b)係顯示本發明的第3實施形態之上視圖及 A-A’剖面圖。基板1形成有凹部，使用銲材3以將冷陰極2 固定在此凹部，並將無機接著劑4充填在槽8内。 在上述第1〜第3實施形態中，係針對使用金矽共晶合 金作爲銲材之情形進行説明，但除此之外亦可使用導電性 膠等。但是，在使用熱硬化性導電性膠時，必須使用硬化 溫度較無機接著劑的硬化溫度高之導電性膠。在使用熱可 塑性導電性膠時，必須使用可塑溫度較無機接著劑的硬化 溫度高者。 接合方法之其他實施形態爲，藉由在冷陰極的下部與 基板的安裝部分形成金膜，而藉由金-金之壓著以進行元件 11 (請先閲讀背面之注意事項再填寫本頁)
I 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） Α7 Β7 五、發明説明（9) 的安裝亦可。在金-金接合時，接合溫度必須爲300 °C左右 且壓力爲1〜10kg/cm2。由於接合溫度較無機接著劑之硬化 溫度高，因此可直接使用無機接著劑。 如以上所説明般，本發明中，由於在固定冷陰極之位 置時使用無機接著劑，該無機接著劑之硬化溫度較安裝冷 陰極時之硬化溫度爲低，因此具有在固定冷陰極之位置時 不致劣化元件位置的精度之效果。又，就算在將電子鎗封 止於玻璃製之陰極射線管内時之高溫步驟中，亦不致造成 冷廢極之位置移動。 【圖面之簡單説明】 圖1(a)、（b)係本發明的第1實施形態之上祝圖及A-A’ 線剖面圖。 * 圖2(a)、（b)係本發明的第2實施形態之上祝圖及A-A’ 線剖面圖。 圖3(a)、（b)係本發明的第3實施形態之上視圖及A-A’ 線剖面圖。 圖4係顯示冷陰極的構造之剖面圖。 圖5係使用冷陰極之電子鎗的剖面圖。 經濟部中央標準扃員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 圖6(a)、（b)係顯示習知的陰極結構體之斜視圖與A-A’ 線剖面圖。 圖7係顯示使用冷陰極之陰極射線管的剖面圖。 圖8係顯示習知的冷陰極微小元件的固定構造之剖面 圖。 圖9(a)、（b)係顯示習知的冷陰極晶片的固定構造之平 12 本紙張尺度適用中國國家標準贫..CNS ) Α4規格（210X297公釐） 318668
A7 B7 五、發明説明（10) 面.圖及剖面圖。 · 圖10(a)、（b)係顯示習知的冷陰極晶片的固定構造之 平面圖及剖面圖。 【符號説明】 1〜基板，2〜冷陰極，3〜銲材，4〜無機接著劑，5、 6〜對準記號，7〜發射區域，8〜槽。 ----------—裝-- - f (請先閱讀背面之注意事項再填寫本頁) 訂- 線 經濟部中央標準局員工消費合作社印製 13 本紙張尺度逍用中國國家標準（CNS ) Λ4規格（210X297公釐）

Claims (1)

  1. 3ΐ3ββ8 Α8 Β8 C8 D8 六、申請專利範圍 1. 一種基板上固接半導體晶片之’方法，具備下列步 驟： 使用安裝材以將前述半導體晶片安裝在前述基板的既 定位置上之安裝步驟； 使用無機接著劑以固定前述半導體晶片的周邊之步 驟；該無機接著劑之硬化溫度較前述安裝步驟所使用之安 裝材的硬化溫度爲低。 2. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，使用該無機接著材以將該半導體晶片的 周邊之至少6點固接在該基板上。 3. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，使用該安裝材以將該半導體晶片安裝在 該基板的凹部上。 4. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，該安裝材爲金矽共晶合金。 5. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，該安裝材爲金-金接合材，且在該半導體 晶片之下部及該基板之安裝部分形成有金膜。 6. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，該安裝材爲導電性膠。 7. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，該安裝材爲熱硬化性導電性膠，其硬化 溫度高於無機接著材之硬化溫度；或該安裝材爲熱可塑性 導電性膠，其可塑溫度高於無機接著材之硬化溫度。 14 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）
    I . 裝 - 訂 -線 1 - (請先聞讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印装 A8 B8 C8 D8 六、申請專利範圍 8. 如申請專利範圍第1項所述之基板上固接半導體晶 片之方法，其中，該半導體晶片爲電子場致發射冷陰極。 9. 一種基板上固接冷陰極之方法；該冷陰極爲電子場 致發射冷陰極，具有：發射部，具備多數個形成於半導體 基板上之導電性物質所構成之微小突起；及閘極部，介由 絕緣膜而形成在前述半導體基板上.；其特徵在於，具備： 使用安裝材以將前述冷陰極安裝在前述基板的既定位置上 之安裝步驟；使用無機接著劑以固定冷陰極的周邊之步 驟；該無機接著劑之硬化溫度較前述安裝步驟所使用之安 裝材的硬化溫度爲低。 10. —種基板上固接半導體晶片之結構，使用安裝材以 將前述半導體晶片安裝在前述基板上，且藉由無機接著劑 以固定半導體晶片的周邊，該無機接著劑之硬化溫度較前 述安裝所使用之安裝材的硬化溫度爲低。 11. 一種基板上固接冷陰極之結構；該冷陰極爲電子場 致發射冷陰極，具有：發射部，具備多數個形成於半導體 基板上之導電性物質所構成之微小突起；及閘極部，介由 絕緣膜而形成在前述半導體基板上；其特徵在於，使用安 裝材以將前述冷陰極安裝在前述基板上，且藉由無機接著 劑以固定冷陰極的周邊，該無機接著劑之硬化溫度較前述 安裝所使用之安裝材的硬化溫度爲低。 本紙張尺度適用中國國家標準（CNS ) Μ規格（210X297公釐）
    (請先聞讀背面之注意事項再填寫本頁) -裝· 經濟部中央標準局員工消費合作社印製
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