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TWI246191B - Circuit device and method of forming the same - Google Patents

Circuit device and method of forming the same Download PDF

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Publication number
TWI246191B
TWI246191B TW092126828A TW92126828A TWI246191B TW I246191 B TWI246191 B TW I246191B TW 092126828 A TW092126828 A TW 092126828A TW 92126828 A TW92126828 A TW 92126828A TW I246191 B TWI246191 B TW I246191B
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Taiwan
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halo
channel region
scope
concentration
substrate
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TW092126828A
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TW200417012A (en
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Cory E Weber
Gerhard Schrom
Ian R Post
Mark A Stettler
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Intel Corp
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
    • H10D62/17Semiconductor regions connected to electrodes not carrying current to be rectified, amplified or switched, e.g. channel regions
    • H10D62/351Substrate regions of field-effect devices
    • H10D62/357Substrate regions of field-effect devices of FETs
    • H10D62/364Substrate regions of field-effect devices of FETs of IGFETs
    • H10D62/371Inactive supplementary semiconductor regions, e.g. for preventing punch-through, improving capacity effect or leakage current
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
    • H10D62/17Semiconductor regions connected to electrodes not carrying current to be rectified, amplified or switched, e.g. channel regions
    • H10D62/213Channel regions of field-effect devices
    • H10D62/221Channel regions of field-effect devices of FETs
    • H10D62/235Channel regions of field-effect devices of FETs of IGFETs
    • H10D62/299Channel regions of field-effect devices of FETs of IGFETs having lateral doping variations
    • H10D62/307Channel regions of field-effect devices of FETs of IGFETs having lateral doping variations the doping variations being parallel to the channel lengths
    • H10P30/204
    • H10P30/212
    • H10P30/222
    • H10P30/225

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  • Insulated Gate Type Field-Effect Transistor (AREA)
  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)

Description

1246191 玖、發明說明: 【發明所屬之技術領域】 本發明係揭示-種電路裝置及形成電路裝置之方法。 【先前技術】 場效電晶體(FET)已為積體電路如多處理器或其他電路 之共同元件。電晶體典型包括在半導體基板中形成之源及 汲接合區,及在基板之表面上形成之閑電極。 常為源及汲接合區間之距離。在美 離在基板内,在間電極下面及 源與没接合間之基板區稱為溝道,溝道之長度為源及没接 合間之距離。 如上述’許多電晶體裝置均在半導體基板内形成。為改 進基板之半導體材料之導電率,基板内㈣進《入)摻雜 劑。代表性言之,Ν·型電晶體裝置可將其源與没區(及間電 極)以Ν-型摻雜劑如砷摻雜。沭型接合區於—井中形成其 先前已以Ρ-型導電率形成。一適當之ρ·型摻雜劑為删, 一電晶體裝置以下述方式1作。载體 板上建立之接點至源與沒接合而流動於源接合與);及= 間:為建立電流之流動’足夠電壓必須加在閘電極以形成 溝道中载體之逆溫層。此—最小量電壓稱為臨界電壓㈤。 =常’當製造同尺寸多電晶體時,理想為如臨界電壓之 性能特性在裝置間均相似。通常臨界電壓驅於降低以塑應 降低之閘長度。當然,性能常受電晶體尺寸降低之限识較 快切換,晶片上更多裝置等),而掌握半導體處理工業之目 標。當閘電極長度料小於丨⑼nm時,可知臨界電壓迅速
O:\88\88177-940603.DOC -6- 1246191 降低。因此,即使閘電極長度之小變化(即與目標長度ι〇ηη 之差)’可構成臨界電遷極大影響。 理想上,限電電壓在目標閘極長度範圍應為常數以顧及 製造邊際。在一方面,為在可接受之閘極長度範圍下,增 進臨界電壓之常數化,在閘極邊緣下可引進局部植入摻雜 劑(P-型於N-型金氧半導體FETS (NM〇SFETS)及队型摻雜 劑於p-型金氧半導體FETS (PM〇SFETS)。此種摻雜劑稱為,, 暈’’植入劑。植入之摻雜劑趨向在溝道週圍升高摻雜濃度, 因而增加臨界電壓。一種效應為降低目標尺寸裝置之臨界 電壓’同時維持最壞情形之尺寸裝置之臨界電壓。 NMOSFETS之典型暈植入包括硼(即,氟化硼BF2)及銦 (In)。供PM0SFETS之暈植入包括砷,銻及磷。與 NMOSFETS相關時,銦為較佳摻雜劑,因為銦溝道形成自 凌置表面之反向輪廓。此一濃度輪廓對銦而言,趨向降低 臨界電壓以符合裝置中之漏電流(I〇ff),因硼摻雜劑無相同 之反向輪廓。銦之問題在低於其所需到達最壞漏電電流 時,銦已到達固-態可溶狀態。對目標小漏電電流(即裴置尺 寸小於100 nm下,為40 na),僅錮種類摻雜劑無法達此標 準。 ’、 【發明内容】 如上所述,錮為較佳NMOSFET溝道摻雜劑(暈摻雜劑), 因為反向濃度輪廓導致較低之臨界電壓及改進之驅動電 机。但以小裝置而言,如目標閘極長度為60 nm或更小,僅 以銦為暈摻雜劑無法接受,因為其固態可溶度有趨勢防止
O:\88\88177-940603.DOC 1246191 銦摻雜一 漏電電流 NMOSFET溝道至_ 高位準以維持可接受之最壞 【實施方式】 圖1顯示具有電晶體於其上之電路基板—部分剖面側視 圖。結構_包料導體材料以石夕代表之基板⑽。圖i之基 板110上形成-電晶體裝置。該電晶體以綱⑽耐為代表, 在P型井120内形成。電晶體裝置包括閘電極削形成在問 長度170之基板no之表面上。電晶體裝置尚包括源接合 及汲接合150。在NMOSFE丁中,源接合14〇與汲接合15〇均為 N-型如閘電極130 一樣。源接合14〇包括尖端植入145,自行 與閘電極130對齊形成(在墊片部分135形成前植入)。源接合 140本體與墊片部分135在閘極13〇上對齊(墊片部分135形成 後植入)。同理,汲接合150包括尖端植入155與閘電極13〇 對齊(輕摻雜汲)。汲接合150與墊片135在閘電極13()上對齊。 圖1亦顯示在基板110之溝道區160之單一暈植入。在一 電晶體裝置為NMOSFET時,第一植入18〇為銦。暈植入可 由導入摻雜離手,如銦離子以傾斜角25-30度植入基板11〇 而形成。導入第一暈180之一方法為在閘電極形成後(但墊 片之前)一植入作業,俾閘電極可作為對正之植入罩幕。 圖2顯示引進第二暈190後圖1之結構。以所示之 NMOSFET ’其中之第一暈180為銦種類,第二暈190為棚種 類(即二氟化硼)。第二暈190可根據第一暈180相同技術以 植入而導入。 在第一暈180為銦及第二暈190為硼或相似種類之例中, O:\88\88177-940603.DOC -8 - 1246191 涉及多暈之技術包括將第一暈180導入基板11()之溝道l2〇 中至矽之銦固態可溶性,通常為2E1 8 cnT3。在植入銦種類 至銦固態可溶度之後,一硼種類被植入作為第二暈19(),其 量足可達到一特殊閘長度裝置之目標臨界電壓。應暸解, 決定適當量之銦及侧摻雜劑之後,植入之順序可以變化。 在以上實施例,銦種類之第一暈(即,第一暈18〇)被導入, 第二暈(即,第二暈190)被導入。因此,結構1〇〇包括二暈 已導入溝道120中。所述之摻雜劑包括錮及硼種類。應瞭解 其種類亦可適於供NMOSFETS或PMOSFETS之用。在一 例中,銦被選擇及在降低閘長度下被導入至其固態溶性 (即,在70 nm或更少之範圍)以達到目標線電壓,漏電流及 驅動電流。圖3顯示在矽基板中與閘長度之選擇漏電流(1。^) 40 nA之暈濃度。圖3顯示當閘長度降低超過i〇〇 ,僅銦 飽和不足以達到理想漏電電流。圖4顯示在石夕基板中之暈濃 度。圖3展現所需濃度以達到漏電電流需求(即,儿18⑽力 大於銦固態溶性(即,2E18 cm·3)。 圖5顯示臨界電壓與摻雜劑濃度之圖形代表。圖5展示 其固悲浴性’鋼飽和。圖6暴 顯示漏電流與臨界電壓之代表
根據以上圖形代表, 最壞情形閘長度裝置時之漏電流(〗。f f)
O:\88\88177-940603.DOC -9- 1246191 :如100 —'目標間長度為6〇 ,銦種類可為第 ^至其固態溶性,第二暈如心導人直到—臨界電壓可 叉持之漏電流亦建立。 圖7及8顯示一特殊閘長度裳置相關之臨界與漏電電流 2圖形代表。此圖形代表朗與製造裝料㈣之製造容 ,特別關於閘長度可接受之變化。為解釋之計,目標閘 長度為70 nm,最壞情形閘長度-10·範圍。圖7說明之暈 植入有趨向降低目標尺寸裝置之臨界電壓而維持最壞情形 二寸裝置之臨界電壓。但不同閘長度之漏電電流影響如圖8 "兄明。習知技藝之銦暈及删井型(銦暈/蝴井)裝置,一最壞 情形閉長度漏電流與目表閘長度比較’最壞情形與目標間 之差為因數1〇。因此,即使最壞情形裝置可能主宰總漏電 電流,所述之多暈裝置有趨勢降低最壞晴形裝置與目標裝 置漏電電流間之差一因數2。 雖然最壞行情形閘長裝置趨向主宰漏電電流,目標裝置 趨向主宰驅動電流。圖9及職明上述之多暈裝置及習知技 藝单暈/棚井裝置。圖9顯示在基板上形成之裝置代表及其 '寸應閘長纟該裝置主要採納一鐘形曲線。圖⑺顯示習知 ,藝以錮暈/删井形成之裝置之典型驢動電流為多(銦及則 暈裝置:圖10顯示’多(錮及删)暈裳置趨向在高目標閉長 度時之高驅動電流,因為其在目標閘長度時有一高漏電電 流。圖11顯示—電晶體裝置之驅動電流與漏電電流之曲線 代表。 以上說明中明特殊實施例包括各別銦及领植入之 O:\88\88177-940603.DOC -10- 1246191 雙晕裝置。甚為明可作不同之修改而無料請專利範 圍所公布之精神與範圍。例如,銦與㈣人係供 (P-型摻雜劑)。N-型裝置亦可以相 七、# 万式(多軍)以其他摻雜 •入。或者,P_型裝置而言’㈣摻雜劑如碎及碟可在 多軍方法中導入’可使驅動電流及漏電電流最佳化。以上 說明書及圖式為說明性而非限制意義。 【圖式簡單說明】 本發明之特性及優點,可由以下申 甲明辱利耗圍砰細說明 及所伴圖式更為明顯,其中: 圖1顯示包括具有第-暈植入之電晶體電路_部分之 面圖; σ 圖2顯示在第二暈植入後圖丨之裝置; 圖3顯示基板中之暈濃度與選擇漏電電流之閘長 線代表; 又 圖4顯示在矽基板中Ρ_型摻雜劑之摻雜劑濃度; 圖5顯示石夕基板之臨界電壓與ρ,摻雜劑濃度之代表曲 線; - 圖6顯示Ρ-型摻雜劑之漏電電流與臨界電壓之曲線代表. 圖7顯示-麵則丁裝置之臨界電漫與閑長度之曲線代 表0 圖8顯示一 NMOSfet之漏電電流與閘長度之曲線代表; 圖9顯示基板上裝置數與閘長度曲線代表; 圖1〇顯示基板上數裝置之驅動電流與閘長度之曲線代 O:\88\88177-940603.DOC -11 - 1246191 圖11顯不一電晶體裝置之驅動電流與漏電電流之曲線代 - 表。 【圖式代表符號說明】 100結構 110基板 120型井 13 0閘電極 135墊片 春 140源接合 145尖端植入 150汲接合 155尖端植入 160溝道區 170閘長度 180第一暈 190第二暈 鲁 O:\88\88177-940603.DOC -12-

Claims (1)

1246191 拾、申請專利範菌: L 一種形成一電路裝置之方法,包含: 形成一具有一溝道區之電晶體裝置; 植入一第一暈進入該溝道區,其中該溝道區之第一暈 /辰度為一相當於該溝道區之材料中第一暈材料之固態 >谷度之量;及 植入與該第一暈不同之一第二暈進入該溝道區。 申明專利範圍第1項之方法,其中該第一暈包含銦。 3·如申睛專利範圍第i項之方法,其中該帛二晕之量係選 擇以達到一漏電電流小於如僅植入該第一暈達到之最 小漏電電流。 4. 5. 如申凊專利範圍第3項之方法,其中該第二暈包含蝴。 一種形成一電路裝置之方法,包含: 植入一第一暈進入一電晶體之裝置之一溝道區,其中 該在溝道區第一暈之濃度為一相當於該溝道區之材料 中第一暈材料之固態濃度之量;及 植入該溝道區第二不同 甘曰p -T、去# ^ 卜叫箪,其1足可達成一該裝置之 目標臨界電壓。 •如申睛專利範圍第5項之方法,其中該第-暈包含錮 8. ”如申請專利範圍第5項之方法,其中該第二晕包含蝴 一種形成一電路裝置之方法,包含: 根據一目標閘長唐,少 卜 在一基板上形成複數個電晶楚 植入第一暈進入每一複數個電晶體之溝道區,其 4溝道區第-軍之濃度相當於該溝道區材料中第一 O:\88\88177-940603.DOC 1246191 材料固態濃度之量;及 旦植入该第二暈進入每一複數個電晶體之溝道區,植入 里足夠達到自該目標間長度之最壞情況可接受間長度 之一目標臨界電屬。 9. 10. 11. 12. 13. 14. 15. 1 6· 如申請專利範圍第8項方法,其中該第-暈包含銦。 如申請專利範圍第8項之方法,其中該第二暈包含删。 種電路裝置,包含: 在一基板上形成之一閘電極; 在該基板上閘電極之下及在接點之間之基板中形成 之一溝道區; 、、第—轉人包含該溝道區中之—第—種類,其中該 溝道區中之第—暈濃度為—相當於該溝道區材料中第 一暈材料之固態濃度之量;及 第-暈植人包含與在該溝道區之—不同第二種類。 如申請專利範圍第U項之電路裳置,其中該第一暈包含 麵0 如申請專利範圍第11項之雷敗狀要甘+ Μ > 只路裝置,其中該第二暈包含 硼。 如申請專利範圍第1項之方、本甘士 ^ 只心万去,其中,植入該第一暈 入該溝道區係以傾斜角約25度至約3G度完成。 如申請專利範圍第5項 入該溝道區係以傾斜角 如申請專利範圍第8項 入該溝道區係以傾斜角 之方法,其中,植入該第一暈進 約25度至約30度完成。 之方法,其中,植入該第一暈進 約25度至約30度完成。 O:\88\88177-940603.DOC -2-
TW092126828A 2002-09-30 2003-09-29 Circuit device and method of forming the same TWI246191B (en)

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US10/261,715 US7226843B2 (en) 2002-09-30 2002-09-30 Indium-boron dual halo MOSFET

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TWI246191B true TWI246191B (en) 2005-12-21

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US (1) US7226843B2 (zh)
EP (1) EP1547154A1 (zh)
CN (1) CN100459146C (zh)
AU (1) AU2003272623A1 (zh)
TW (1) TWI246191B (zh)
WO (1) WO2004032241A1 (zh)

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