TW588413B - Manufacturing method and device of memory with different depths of isolation trench - Google Patents
Manufacturing method and device of memory with different depths of isolation trench Download PDFInfo
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- TW588413B TW588413B TW091132748A TW91132748A TW588413B TW 588413 B TW588413 B TW 588413B TW 091132748 A TW091132748 A TW 091132748A TW 91132748 A TW91132748 A TW 91132748A TW 588413 B TW588413 B TW 588413B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/105—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including field-effect components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/76224—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
- H01L21/76229—Concurrent filling of a plurality of trenches having a different trench shape or dimension, e.g. rectangular and V-shaped trenches, wide and narrow trenches, shallow and deep trenches
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B99/00—Subject matter not provided for in other groups of this subclass
Description
588413 A7 五、發明說明(/ ) 本發明係關於一種不同隔離溝槽深度之記憶體製法及 裝置’尤指一種於5己憶體的週邊區域(peripheral area)中形 成較記憶元區域(cell area)中更深的隔離溝槽(trench),以令 記憶體於高電壓操作時保有較佳的電氣特性。 於記憶體的製程技術當中,淺溝隔離技術(Shall〇w trench isolation,ST1)目前已廣泛應用,就以快閃記憶體而 言,一完整記憶體大致上可概分為兩大區域,即記憶元區 域(cell area)及其四週的週邊區域(peripheral打⑸),前者係 供形成記憶陣列(cell area)用,而後者則供操作記憶體之控 制電路設計。 以Is夬閃。己丨思體的1賣寫方式來看,因其操作電壓必須維 持-定大小而無法以低電壓進行讀寫,故當操作電壓較高 時,應於記憶體之週邊區域中形成更深的隔離溝槽,使其 中的控制電路彼此之間能獲得較佳之隔離效果,以避免由 高壓所導致的漏電流。 惟目前記憶體當中的週邊區域與記憶元區域,立作法 均採取相同光罩進行同步姓刻,故兩區域所形成的 離溝槽深度均為一致。如此所形成的溝槽深度,對週邊 二中:控制電路而言’當高壓工作時仍是無法提供其所 項的隔離效果,其仍舊具有漏電流的問題。 係提Γί述目前記憶體製法的缺失,本發明之主要目的 對开心不同W溝槽深度之記憶體之製法及其裝置, 生==厂?控制電路可有效避免漏電流情況發 隐體在兩壓操作時仍可財較佳的電氣特性。 x 297公釐广
--------— I — · I I (請先閱讀背面之注意事項再填寫本頁) -=0 - I n n , 1 張尺準(CNS)A4 規袼; 588413 A7 五、發明說明(>) 為達成前述目的,本發明之記憶體製法係採取多次蝕 亥J製知於π己丨思體當中的§己憶元區域(cell area)及週邊區域 • I I----- (請先閱讀背面之注意事項再填寫本頁) (peripheral area)中,分別形成深度相異之隔離溝槽扣⑶^) ,使週邊區域中所形成之隔離溝槽較記憶元區域中更深入 内部。 其中,前述多次蝕刻製程係為二階段式蝕刻,第一階 段係於記憶元區域及週邊區域中均形成深度一致之隔離溝 槽,爾後複以光阻劑覆蓋於前述記憶元區域上方,而針對 週邊區域中所形成的隔離溝槽再次進行第二階段的蝕刻, 使其深度更深入内部。 本發明之又一目的係提供一種不同隔離溝槽深度之記 憶體之製法及其裝置,於不變動記憶元區域㈣扣叫設計 的前提之下,僅須局部改變週邊區域之製法,因毋須變更 記憶元區域當中複雜的佈線設計,使記憶體之生產過程 仍可維持其製造良率。 王 本發明之再一目的係提供一種不同隔離溝槽深度之吃 憶體之製法及其裝置,因快閃記憶體⑺ash mem〇ry)操作日士 必須以高工作電壓進行,故特別適用於快閃記憶體之製: 〇 為使貴審查委員能進一步瞭解本發明之架構及其他 目的’茲附以圖式詳細說明如后: (一)圖式部份: 第一圖〜第八圖:係本發明一實施例之製法流程圖。 第九圖〜第十A、十3、十〇圖:係本發明另一實施例之 本紙張尺㈣財目準(CNS)A4 gy 588413 A7 B7 五、發明說明( 製法流程圖。 第十一圖〜第十四圖:係本發明又一實施例之製法流程圖
} oe) 二 lld Γν ΓΧ X 份部板號基 圖 η η tu 層 化氧隧 穿 \ly ο 2 (2 0 a )氮化矽層 (2 0 b )側壁氮化矽層 (3 0 )第一閘極層 (4 0 )第一氮化矽層 (5 0 )遮罩層 (6 0 ) ( 6 0 a )淺隔離溝槽 (7 0 ) ( 7 〇 a )光阻劑 (8 0 )深隔離溝槽 (9 0 )第二閘極層 (1 0 0 )第二氮化矽層 清參閱第一圖至第八圖所示,為本發明一實施例之製 法流程示意圖,於圖面左半邊係代表記憶元區域(cell area) ’而於圖面右半邊則代表前述記憶元區域(cell area)外圍的 週邊區域(P^pheral area)。 ^參閱第一圖所示,於一矽基板(1 0 )上係序形成 有一穿隧氧化層(2 〇 )(約80〜120 A)、一採用複晶矽 沉積形成的第-閘極層(3 0 )(約400〜1〇〇〇 A)、-第 -氮化石夕層U 0 )(約_〜2000 A)及一利用卿玻璃 (BSG)製成的硬式遮罩層(5 〇 )。 、於遮罩層(5 0 )形成之後,藉由光罩顯影技術於兩 區域上分別定義出適當的元件㈣(閘極圖案),亦即於 一 k:層(5 〇 )上方塗佈光阻後,曝光、顯影及向下蝕 刻至月〕述帛@極層(3 q )為止,姓刻完畢後去除光 (請先閱讀背面之注意事項再填寫本頁) ,裝—— ------訂---------· 5 A7 B7 五、發明說明(+ ) (如第二圖戶斤+ > 一 ( ’、,/、中,因記憶元區域所欲形成的記憶 cell)係為高密度排列,故此階段中之蝕刻光 罩係^深紫外線光罩(DUVMask)。 )作η考第二圖所示’爾後直接利用前述遮罩層(5 0 作:,的阻絕層,對非遮蔽區域的第-閉極層(3 〇 石々其i,氧化層(2 〇 )向下進行等向性钮刻’並深入於 ‘二内部約1500〜3〇〇〇A❿形成第-階段的淺 ^離溝槽(6 0 ) ( 6 〇 a )。 ,參閱第四圖所示,透過另一光罩作業,在記憶元區 二^面覆蓋一層光阻劑(7〇),而週邊區域則呈開 /悲:對未覆有光阻劑(7〇)之週邊區域,再進行一 二,刻%序’令在圖面右邊之原淺隔離溝槽(6 “)向 二10)再度向下延伸’而形成第二階段的深隔離溝 :(8 0),其深度約為35〇〇〜侧此敍刻步驟因僅針 丄排列密度較低的週邊區域進行,而記憶元區域則由 光阻劑(7 0 )覆蓋,故可採用成本較低的讀歸( 中紫外線光罩)即可。於完成深隔離溝槽(8 G )後,復 將光阻劑(70)去除(如第五圖)。 請參閱第六圖所示,經去除兩區域上方之遮罩層(5 再於各隔離溝槽(6〇) (8〇)内部沉積高密度 ^水,化⑦(HDP-Sl〇2),復以化學機械研磨法(c⑽ 進仃表面平坦化’據以形成兩種不同深度之隔離溝槽。 之後,將前述第六圖之第一氮化石夕層(4 0)與各隔 離溝槽(60) (80)之表層復加以去除,並以複晶石夕 才度適用兩家標準(CNS)A4規格㊈ --------^---------Μ0Ι. (請先閱讀背面之注意事項再填寫本頁) x 297公釐) 588413 A7 五、發明說明 材質全面沉:::二閘極層(9〇),於記憶元區域部分 之第二閘極層(9 〇 )上方,則再々 / π n ^ ^ ⑴丹夂利用蝕刻手段配合光 阻劑(7 〇 a )疋義出第二氮化矽層(丄〇 〇 ),此第二 氮化矽層(1 〇 0)的圖案將作為閘極的圖案。 一 請參閱第八圖所示,未被光阻劑(7〇:)所覆苗的 第二問極層(9Q)係加以_去除而顯露出淺隔離溝槽 (6 ◦)之表層’再制該光阻劑(7 〇 a )作為一阻絕 層,僅將祕子以離子佈值技術注人至淺隔離溝槽(6 〇 )下方’耩此增加各個記憶❿⑽” eell)彼此之間的隔 離效果’最後將光阻劑(7 〇)去除以供進行後續製程。 由刖述《兒月中可知此貫施例分別於記憶體之記憶元區 域及週邊區域分別形成不同深度之隔離溝槽(6 〇 )( 8 0),而為符合週邊區域上控制電路的高壓操作需求,使 其隔離溝槽(8 G )更深人於基材㈣以提供較佳的隔離 效果,而有效減緩漏電流的情況發生。再者,此製程與傳 統製程相較,僅增加一道較低成本之DUV Mask即可形成 不同深度之隔離溝槽( 6 0 ) ( 8 0 ),確具產業利用性 #請配合參閱第、十(A )、十(B )、十(C )圖 所不,為本發明之另一可行實施例,其前段製段與前揭實 施例不同處在於,當第二閘極層(9 0 )尚未進行蝕刻之 4 ’即先施行前述離子佈植,透過控制佈植強度同樣將硼 離子植入於淺隔離溝槽(6 0 )下方(如第九圖)。於離 子佈植結束後將光阻劑(7 0 a )清除,並形成一層薄氮 (請先閱讀背面之注意事項再填寫本頁) -------訂---------線】 2二爱) --~~一 588413 A7 五、發明說明(“) ^夕層(2 〇 3 )(如第十A圖),再回餘刻(Etching a:k去除而轉變為側壁(,㈣氮化石夕層(2 〇匕)( 士第十B十C圖),因兩相鄰側壁之間的寬度縮短,如 此得利用此窄寬對下層第二閘極層(9〇)進行㈣,亦 即該侧壁氮化石夕層(20b)可對下方的第二閉極層(9 〇)提供部分遮覆效果使其免於蝴,使第二閘極層(9 〇)之有效面積增加,藉此提高電晶體元件其耗合率 (coupling rati〇)而提昇記憶體效率。 t奢參閱第十一、十二圖所示,為本發明之再—實施例 ,其同樣利用顯影_步驟(如前述第—實施例第一至第 四圖所不)’僅先行於週邊區域定義出深隔離溝槽(8 〇 ),而記憶體的記憶元區域部分則先以光阻劑遮覆,故未 形成有隔離溝槽。於深隔離溝槽(8 〇)形成後,將覆蓋 於記憶元區域及週邊區域上的遮罩層(5 〇 )全面去除。 請配合參看第十三、十四圖所示,於週邊區域部于分以 氧化製程形成-薄膜氧化層(圖中未示),爾後將此薄膜 氧化層蝕除,即可令深隔離溝槽(8 〇 )之頂、底部圓角 化,此一步驟將有助於後續深隔離溝槽(8 〇 )内部1行 HDP-Si〇2沉積時增加其充填效果。在深隔離溝槽(^ )製成後,於記憶元區域部分同樣以光罩蝕刻方式形成咬 隔離溝槽(60),至此記憶體中之記憶元區域及週邊=
域即可分別獲得不同深度之隔離溝槽,為其提供不同好 之隔離效果。 1 X 於記憶元區域之淺隔離溝槽(6 〇 )形成後,同樣採 L__8__ 本纸張尺錢肖中國國家標準(CNS)A4規格(210_x 297公爱) ----〜____ -------^---------- (請先閱讀背面之注意事項再填寫本頁) A7 B7
、發明說明(^ 用HDP-Si〇2沉積充填於各隔離溝槽 部,並採取化學機械研磨法(c (8 0)内 (如第六圖所示)。 進仃表面平坦化處理 此實施例之優點在於採用^ ^ ^ 序W不R冰度之隔離溝槽( 6 0 ) ( 8 0 ), 二=邊區域及記憶元區域的溝槽形成是非同步式的,故 :週邊,域中的深隔離溝槽(80)可將其頂、底部圓角 =。其沉積良率。再者’於記憶元區域㈣淺隔離溝 槽(6 0)之際,僅採用氮化石夕層(4〇)作為其姓刻遮 罩’而非採用财玻璃之硬式遮罩層(5〇),故可免除 ㈣刻去除硬式遮罩層(5 Q )導致穿隨氧化層(2 〇 ) 發生過蝕(over etch)而影響其品質。 本發明無論採取前述何種製程實施,於記憶體内部均 可獲得不同深度之隔離溝槽,尤其針對須高壓操作的週邊 區域’藉由深隔離溝槽設計可有效降低高壓感應所導致的 漏電流’㈣適驗冑黯崎料料計領域巾,相較 於目則§己憶體製程確為一極具功效之優良發明,因此本發 明設計實符合發明專利要件,爰依法具文提出申請。 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公爱) (請先閱讀背面之注意事項再填寫本頁} --------訂·--------線.
Claims (1)
- 竹乎>月μ)日 申請專利範圍 體丄:Γ广離溝槽深度之記憶體製法,係於記憶 m 域(ceiiarea)及週邊區域㈣u rrr=剛程,分別形成深度相異之隔離溝 中更深入於基_部。 成之卩-溝槽較記憶元區域 2·如申請專利範圍第1項所述不同隔離溝槽深度之 記憶體製法,其中該非同步钱刻製程包括有: 準備-記憶體基板,該基板上依序形成—穿随氧化層 第ffl極層、-第一氮化石夕層及一硬式遮罩層; 、元件定義手段,係於記憶體基板之記憶元區域及週邊 區域定義閘極圖案; 一第-㈣手段’係、根據定義出之閘極圖案,於該記 憶體基板之記憶it區域及週邊區域對基板向下㈣,於相 鄰閘極間形成淺隔離溝槽; 、一第一光罩定義蝕刻手段,僅對該記憶體基板週邊區 域之淺隔離溝槽再次進行蝕刻而構成深隔離溝槽。 3 ·如申請專利範圍第2項所述不同隔離溝槽深度之 記憶體製法,其中該元件定義手段係以深紫外線光罩(Duv Mask)貝施,該弟二光罩定義|虫刻手段係以中紫外線光罩 (MUV Mask)定義而成。 4 ·如.申請專利範圍第2項所述不同隔離溝槽深度之 §己憶體製法,更包括有: 於前述淺隔離溝槽及深隔離溝槽形成後,去除該記憶 體基板上之硬式遮罩層; 本紙張尺度適用中國國家標準(CNS)A4規格(21〇 x 297公釐)!!#. i (請先閲讀背面之注意事項再塡寫本頁) 、νδ % 申Μ專利範圍 將k於則述淺隔離溝槽及深隔離溝槽中沉積充填高密度電 水氣化矽(HDP Si〇2); 、表面平坦化,去除前述第一氮化石夕層及各隔離溝槽之 义層/儿積物,而於第一閘極層處獲得一平整表面; /儿積一弟一閘極層於第一閘極層上方。 ▲ 5 ·如巾請專利範圍第4項所述不同隔離溝槽深度之 記憶體製法,更包括有: /儿積一.第一鼠化石夕層於第二閘極層上方; 光罩定義及蝕刻第二氮化矽層及第二閘極層; 離子佈植,於記憶元區域中將硼離子佈植於各淺隔離 溝槽之底部下方。 6 ·如申請專利範圍第4項所述不同隔離溝槽深度之 記憶體製法,更包括有: 沉積一第二氮化矽層於第二閘極層上方; 光罩定義及蝕刻記憶元區域中第二氮化矽層; 離子佈植,於記憶元區域中將硼離子穿透過第二閘極 層而佈植於各淺隔離溝槽之底部下方; 全面性形成一薄氧化層; 回蝕刻該薄氧化層,而令前述第二氮化矽層側壁面形 成側壁氮化石夕層(spacer)。 7·如申請專利範圍第1項所述不同隔離溝槽深度之 記憶體製法,其中該非同步餘刻製程包括有·· 準備一記憶體基板,該基板上依序形成一穿隧氧化層 、一弟一閘極層、一第一氮化石夕層及一硬式遮罩層,· 588413 A8 B8 C8 D8 ‘、申叫專利範圍 元件定義手段,係於記憶體基板之週邊區域定義閘極 圖案; 一第一钱刻手段,僅對該記憶體基板之週邊區域向下 触刻,形成深隔離溝槽; 去除遠硬式遮罩層; 一第二光罩定義蝕刻手段,僅對前述記憶元區域形成 淺隔離溝槽。 8 ·如申請專利範圍第7項所述不同隔離溝槽深度之 記憶體製法,丨中於第二光罩定義㈣手段之前,係包括有: 圓角化手段,對週邊區域形成一氧化層,復將此氧 化層回敍刻而令深隔離溝槽頂、底部圓角化。 9 · 一種不同隔離溝槽深度之記憶體,係於一記憶體 基板之記憶元區域(cell area)及週邊區域(peripheral紅⑽)上 形成有閘極圖案,各閘極圖案上方形成有一穿隧氧化層及 一第一閘極層,其中記憶元區域相鄰閘極間,係形成有淺 隔離溝槽及填入供隔離之氧化層,而於週邊區域之相鄰閘 極間係形成有深隔離溝槽及填入供隔離之氧化層。 1 〇 ·如申請專利範圍第9項所述不同隔離溝槽深度 其中於記憶元區域之淺隔離溝槽下方係佈值有 (請先閲讀背面之注意事項再塡寫本頁) 、1Τ: 線 之記憶體 棚離子。 11 之記憶體 (HDP Si02)。 如申請專利範圍第9項所述不同隔離溝槽深度 其中於各隔離溝槽内係填以高密度電漿氧化矽 12 本紙張尺度適用中國國家標準(CNS)A4規格(21〇 χ 297公釐) 588413 ΧΛ/ /0 £ ϋιΞ 國
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