TW521355B - Reduction of reverse short channel effects - Google Patents

Reduction of reverse short channel effects Download PDF

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TW521355B
TW521355B TW089125395A TW89125395A TW521355B TW 521355 B TW521355 B TW 521355B TW 089125395 A TW089125395 A TW 089125395A TW 89125395 A TW89125395 A TW 89125395A TW 521355 B TW521355 B TW 521355B
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Jeffrey Scott Brown
Stephen Scott Furkay
Robert J Gauthier Jr
Dale Warner Martin
James Albert Slinkman
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Description

521355 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明( 標號為1 0之NFET之剖面圖,其中淺鍺佈植物22已經被 佈植入源極18及沒極20區域中。一 p型碎基材12包含 一閘極1 4,安置於一閘氧化層1 5上及於側壁間隔壁1 6 間。源極1 8,及汲極2 0擴散物均具有被形成之淺鍺佈植物 22,以防止RSCE。 然而,傳統用以降低RSCE之技術可能需要其他處理 步驟,並可能對裝置之效能造成不想要之附帶影響。於本 技藝所需要的是一種用以製造半導體裝置的方法,其並沒 有 RSCE。 發明目的及概述: 本發明為一半導體裝置,其包含一半導體基材,一第 一擴散區安置於該基材中,一第二擴散區安置於該基材 中,一通道區域安置於第一擴散區灰第二擴散區之間,一 閘氧化物安置於半導體基材上於該通道區域上,並重叠該 第一擴散區及第二擴散區,一閘電極安置於該閘氧化層 上,及一中性掺雜物擴散佈植物安置於整個基材上'該中 性摻雜擴散佈植物具有一峰值濃度於該第一擴散區域及 第二擴散區域之間。
導電類型之半導體基材上,全面佈植一中性摻雜物進入該 基材中,以形成一中性掺雜佈植物,形成一閘電極於該氧 化物層上,及佈植源極及汲極區域進入基材中,至一低於 鍺佈植物之峰值濃度深度的深度。 第3頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) -ϋ n n ϋ n n n n I · ϋ I I fl— fl— i «ϋ J V t n n n l i I gm— I '»!.. * i , (請先閱讀背面之注意事項再填寫本頁) 521355 A7 B7_ 五、發明說明() 本發明將以例示方式加以參考附圖說明,這些附圖係 作例示目的而不是限制用,其中相同元件係於圖中被標示 以相同標號。 - 圖式簡單說明: 第1圖為一圖表,顯示反相短通通效應及短通道效應; 第2圖為傳統鍺佈植於源極及汲極内之場效電晶體之剖面 圃, 第3圖為於鍺摻雜時覆蓋以氧化物層之晶圓的剖面圖; 第4圖為第3圖之晶圓於摻雜後之剖面圖; 第5圖為第4圖之晶圓於閘極形成及源極與汲極掺雜後之 剖面圖; 第6圖為於一實施例之場效電晶體相對摻雜物濃度之圖 表; 第7圖為場效電晶體受到鍺佈植後,閘電極形成於氧化物 層上之剖面圖;及 第8圖為對於具有鍺佈植之場效電晶體之rscE降低沒有 後續SCE惡化之圖表。 ^ r-------,----^--------- « (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印制衣 圖號對照說明: 10 N場效電晶體 12 ρ蜇矽基材 14 閘極 15 閘氧化層 16 側壁間隔層 18 源極 20 ί及極 22 猪佈植物 第4頁
本紙張尺錢财_家標準(CNS)A4規格(210 X 521355 A7 五、發明說明( 佈植係於隨後步驟中加以佈 植。雖然任何中性摻雜物可以 被使用,例如矽或鍺,但鍺γ 缚係較佳中性摻雜物。於一實施 例中,鍺係被佈植以形成.一峰 w 擎值术度由約〇· 10至約〇 5〇 微米’較佳係約〇· 1 5至约〇 w’ υ·30倣未深,及最好是約〇 2〇 至約0.25微米深。一最終峰鍺濃度約1〇19每立方公分至 約1〇21每立方公分係較佳的,最好是約ι〇μ每立方公分 之濃度。於ρ型矽區域12之鍺濃度較佳係約ι〇17每立= 公分至約1019每立方公分,最好是@ 1〇18每立方公分之 濃度。於ρ型矽區12表面及峰濃度間之鍺濃度可以以任 方式加以’吏化,但一對數變化係較佳的(見例如第6 圖)。為了於正確深度形成鍺佈植物及濃度,鍺離子可以 以例如約230至約270keV以約1〇ΐ3每平方公分至約1〇10 每平方公分加以佈植,較佳約245至約255keV至約1〇Μ 每平方公分至約1 〇 15每平方公分。 第4圖示出於佈植鍺後之nfET之剖面圖。距離,,χ” 代表由Ρ型矽區表面至如上所述鍺佈植物之峰濃度的距 離。率線2 6代表鍺佈植♦濃度深度。鍺濃度由峰濃度深 度26於兩方向降低。距離,,χ”可以是任一值,其於Nfet 之源極,汲極及通道區域中造成適當之鍺濃度者,較佳具 有上述值。 現參考第5圖,顯示出於閘極形成’及源極及沒極掺 雜後之NFET。閘極形成係較使用已知技術加以執行,及 閘極1 4可以是一多晶矽閘。於閘極形成前,氧化物層2 3 係被作出圖案並触刻,以造成具有约4至約1 1奈米之厚 第6頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) : ,---_1·-裝 (請先閱讀背面之注意事項再填寫本頁) .----訂-------- 經濟部智慧財產局員工消費合作社印製 521355 A7 B7 五、發明說明( 度的閘氧化層。一多晶矽層然後被形成,作出圖案,並蚀 刻,以造成具有厚度約100至約200奈米之多晶矽閘極 14 〇 一旦閘極1 4被形成,則源極丨8及汲極2〇擴散區可 以被摻雜。源極18及汲極20之離子佈植以η型雜質,造 成約1019至約1〇21之離子濃度,較佳具有約102〇之濃度。 源極1 8及汲極20區較佳係被佈植至少於約〇丨5微米,最 好是少於約〇 · 1 〇微米之深度。包含氧化物或氮化物之側壁 間隔層16可以選擇地形成於閘極14之侧邊上,以形成一 第二佈植物(未示出)於源極18及汲極20之中。 於此階段,鍺佈植物係被擴散於源極1 8,汲極2〇, 及源極1 8及汲極20間之通道中。回火係被執行以活化捧 雜物,並回復矽基材之結晶結構。回火可以發生於约 至約1200度攝氏。於回火後,NFET製造可以使用傳統金 屬化及鈍化技術加以完成。 第6圖顯示NFET之各區域之離子濃度。如上所述及 如於考6圖所示,峰鍺佈植物濃度係較佳較源極及沒極佈 植物形成更深入晶圓中。於上述NFET中,源極及沒極佈 植物係為η型離子,及晶圓離子為ρ型離子。示於第6圖 及所述之濃度及深度係作為例示用,熟習於本技藝者可以 知道,其他摻雜濃度及佈植深度將是可能並係在本發明之 範圍内。 重要的是,鍺可以於NFET製程中,於源極及沒極形 成前加以佈植。例如,鍺可以於形成氧化層23前被佈植, 第7頁 (請先閱讀背面之注意事項再填寫本頁) 裝 \---I ^--------- — . 經濟部智慧財產局員工消費合作社印製 521355 經濟部智慧財產局員工消費合作社印制农 A7 B7 五、發明說明() 或於形成閘電極14後,加以佈植。第7圖顯示於閘極1 4 形成後,鍺佈植步驟。為了有效佈植鍺於通道區中,於閘 極1 4下,鍺離子必須以如'於第7圖所示之角度加以佈植。 佈植能量及劑量係被調整,以補償佈植之角度。鍺佈植可 以使用示於第7圖之佈植技術,於源極1 8及汲極2 0及於 側壁間隔層1 6形成後加以佈植。 於P型基材中之鍺的全面佈植抑制硼之聚集及通道之 不定性,藉以取決於裝置技術,而降低RSCE至少百分之 十五或更多。第8圖為一圖表,其比較本發明之佈植有鍺 之NFET之短通道臨限電壓與傳統沒有鍺佈植之NFET。 具有鍺佈植物之NFET係以虛線表示。反向短通道效應係 降低至接近用於佈植有鍺NFET之理想位準。然而,短通 道效應並不會隨著鍺佈植而惡化。 上述之NFET具有大量降低反向短通道效應之優點, 而不會有等量之NFET之短通道效應或其他臨限特性之劣 化。單一錯佈植步驟允許鍺佈植物容易加入於標準NFET 及CMOS應用中。 》 雖然,較佳實施例已經加以顯示及描述,但各種修改 及替代可以在不脫離本發明之精神及範圍下加以完成。因 此,可以了解的是本發明係以例示方式加以說明,於此所 述之圖示及實施例並不是用作為_請專利範圍之限定。 第8頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) (請先閱讀背面之注意事項再填寫本頁) ,I · m n n flu n n n J < 4 n ϋ— emmm§ n smmmmm flu m I · r I · .t.

Claims (1)

  1. 521355 A8B8C8D8 六、申請專利範圍 1· 一種恸於製造一半導體裝置的改良製程,該半導體裝置 具有閘極形成於其中,及擴散區域形成於一半導體基材 上,該製程至少包含··’ 全面佈植一中性掺雜物於半導體基材内_,以一足以 佈植該中性摻雜物至深於擴散區深度的深度進行。 2 ·如令請專利範圍第1項所述之製程,其中上述之中性摻 雜物為鍺及該佈植步驟包含於擴散區形成前佈植該 錯。 .如申請專利範圍第1項所述之製程,其中上述之中性掺 雜物係為鍺及該佈植步騾包含於閘極形成前,佈植該 鍺。 (請先閱讀背面之注意事項再 « ___ 本頁) 訂 經濟部智慧財產局員工消費合作社印製 4.如申請專利範圍第1項所述之製程,其中上述之中性捧 雜物係為鍺及該佈植步騾包含佈植該鍺以足夠劑量,以 防止於擴散區間之半導體基材中之摻雜物相對於製程 中之加熱階段時之掺雜物於擴散區中之過擴散。 5·如令請專利範圍第1項所述之製程,其中上述之中性掺 雜物為鍺及該半導體裝置為一場效電晶體(FET)。 6·如申請專利範圍第1項所述之製程,其中上述之中性掺 雜物為鍺及該擴散區為源極汲極擴散區。 線 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 521355 A8 B8 C8 D8 六、申請專利範圍 7. 如申請專利範圍第1項所述之製程,其中上述之閘極為 多晶梦。 ---------------- (請先閱讀背面之注意事項本頁) 8. 如申請專利範圍第1項所述之製程,其中上_述之中性摻 雜物為鍺及該半導體基材為矽。 9. 如申請專利範圍第1項所述之製程,其中上述之中性摻 雜物為鍺及該鍺係被佈植入該半導體基材中,以形成由 約0.1 0至約0 · 5 0微米深之峰值濃度。 10·如申請專利範圍第9項所述之製程,其中上述之鍺係被 佈植入該半導體基材中,以形成由約0.1 5至約0.3 0微 米深之峰值濃度。 線· 1 1 ·如申請專利範圍第1 0項所述之製程,其中上述之鍺係 被佈植入該半導體基材中,以形成由约0.20至約0.25 微米深之峰值濃度。 > 經濟部智慧財產局員工消費合作社印製 1 2 ·如申請專利範圍第1項所述之製程,其中上述之中性掺 雜物為鍺及該鍺係被佈植以具有由約1019至1021鍺離 子每立方公分之峰值濃度。 1 3.如申請專利範圍第1項所述之製程,其中上述之中性捧 雜物為鍺及該鍺係被佈植以具有約1 02G鍺離子每立方 第10頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 521355
    六、申請專利範圍 公分之峰值濃度。 1 4 ·如申請專利範圍第1項所述之製程,其中上述之中牲摻 雜物為鍺及該佈植係完成於形成閘極之後。_ 1 5 ·如申請專利範圍第丨項所述之製程,其中上述之中生按 雜物為鍺及該佈植係完成於形成擴散區之後。 1 6.如申請專利範圍第1項所述之製程,其中上述之中棟按 雜物為碎。 17· —種半導體裝置,至少包含: 一半導體基材; 一第一擴散區沉積於該基材中; 一第二擴散區沉積於該基材中; 一通道區,安置於第一擴散區及第二擴散區間; 厂閘極氧化層,安置於該半導體基材上,於通道區 上並重疊於該第一擴散區及第二擴散區; 經濟部智慧財產局員工消費合作社印製 一閘電極,安置於該閘氧化層上;及 一中性摻雜物擴散佈植物,沉積於整個基材上,該 中性摻雜擴散佈植物於第一擴散區及第二擴散區間具 有一峰值濃度。 1 8 .如申請專利範圍第1 7項所述之裝置,其中上述之中性 第11頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 521355 OQ888 ABCD 六、申請專利範圍 捧雜擴散佈植物為鍺及該半導體裝置為場效電晶體。 ^ ^------- (請先閲讀背面之注意事項寫本頁) 1 9·如申請專利範圍第1 7項所述之裝置,其中上述之中性 摻雜擴散佈植物為鍺及該第一擴散區及第二擴散區為 源極及汲極擴散區。 20.如申請專利範圍第17項所述之裝置,其中上述之中性 摻雜擴散佈植物為鍺及該閘極為多晶矽。 2 1 ·如申請專利範圍第1 7項所述之裝置,其中上述之中性 掺雜擴散佈植物為鍺及該半導體基材為矽。 22.如申請專利範圍第17項所述之裝置,其中上述之中性 摻雜擴散佈植物為鍺及該錯擴散佈植物具有由約 至約0 · 5 0微米深之峰值濃度。 -•線- 2 j ·如-申清專利範圍第2 2項所述之裝置,其中上述之鍺擴 散佈植物具有由約〇·15至約〇·30微米深之峰值濃度。 經濟部智慧財產局員工消費合作社印製 24.如申請專利範圍第23項所述之裝置,其中上述之錯擴 散佈植物具有由約〇·2〇至約0.25微米深之導值濃度。 2 5 ·如申請專利範圍第1 7項所述之裝置,其中上述之中性 掺雜擴散佈植物為鍺及該鍺擴散佈植物係具有由約 第12頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公β -- 521355 A8 B8 C8 D8 六、申請專利範圍 1〇19至1021鍺離子每立方公分之峰值濃度 2 6 .如申請專利範圍第2 5項所述之裝置,其中上述之鍺擴 散佈植物具有約丨〇2〇鍺離子每立方公分之峰值濃度。 27 ·如申請專利範圍第1 7項所述之裝置,其中上述之中性 摻雜擴散佈植物為錯及該間極絕緣層具有由約4至約 1 1奈米之厚度。 2 8.如申請專利範圍第17項所述之裝置,其中上述之中性 掺雜擴散佈植物係為鍺及該閘極具有約1 〇 〇至約2 〇 〇奈 米之厚度。 丨丨 — 丨 — — — — — 11· I I J · (請先閱讀背面之注意事項寫本頁) 經濟部智慧財產局員工消費合作社印製 29.如申請專利範圍第17項所述之裝置,其中上述之中性 摻雜擴散佈植物為矽。 3 0. —種製造場效電晶體之製程,至少包含步驟·· ’ 形成一氧化物層於第一導電類型之半導體基材上; 全面佈植中性摻雜離子入該基材中,以形成一中性 摻雜佈植物; 形成一閘電極於該氧化物層上;及 佈植源極及波極區’進入基材中至深於中性摻雜_ 植物峰值濃度發生之深度的深度。 第13頁 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) '線 ^1355 Α8 Β8 C8 D8 圍 ^、申請專利範 (請先閲讀背面之注意事項再^寫本頁) 3 1 ·如申請專利範圍第3 〇項所述之製程,其中上述之中性 摻雜離子為鍺及該全面佈植步驟包含以足夠劑量佈植 該者,以防止於源極及设極區間之半導體基材中之摻雜 物相對於;製程之加熱階段時之源極及汲極區中之摻雜 物的過擴散。 3 2.如申請專利範圍第3 0項所述之製程,其中上述之中性 摻雜離子為鍺及該閘極為多晶碎。 3 3 ·如申請專利範圍第3 0項所述之製程,其中上述之中性 摻雜離子為鍺及該半導體基材為矽。 3 4.如申請專利範圍第3 0項所述之製程,其中上述之中性 摻雜離子為鍺及該鍺係被佈植入該半導體基材中,以形 成具有由約0.1 0至約0 · 5 0微米深之峰值濃度。 經濟部智慧財產局員工消費合作社印制衣 3 5 ·如申請專利範圍第3 4項所述之製程,其中上述之中性 摻雜離子為鍺及鍺作被佈植入該半導體基材中,以形成 具有由約0.15至約0.30微米深之♦值濃度。 3 6 ·如申請專利範圍第3 5項所述之製程’其中上述之錯係 被佈植入該半導體基材中,以形成具有由約0.20至約 0.25微米深之峰值濃度。 第Η貫 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公爱) A8B8C8D8 521355 六、申請專利範圍 3 7.如申請專利範圍第3〇項所述之製程,其中上述之中性 摻雜離子為鍺及該鍺係被佈植以具有由約1019至l〇2i 鍺離子每立方公分之峰嘧濃度。 38. 如申請專利範圍第37項所述之製程,其中上述之鍺被 佈植以具有約1 〇2G鍺離子每立方公分之♦值濃度。 39. 如申請專利範圍第30項所述之製程,其中上述之中性 摻雜離子為鍺及該全面佈植係完成於形成閘極之後。 4 0.如申請專利範圍第3 〇項所述之製程’其中上述之中性 摻雜離子為鍺及該全面佈植係元成於形成擴散區之 後。 41·如申請專利範圍第30項所述之製程’其中上述之中性 捧雜離子為;^。 1 1« n n mma§ n n n n ϋ n fl— n I « 1« n (請先閲讀背面之注意事項再 本頁) 線- 經濟部智慧財產局員工消費合作社印製 第15貫 本紙張尺度適用中國國家標準(CNS)A4規格(210 % 297
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US6486510B2 (en) 2002-11-26
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US6352912B1 (en) 2002-03-05
EP1139431A3 (en) 2003-08-13
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IL140508A0 (en) 2002-02-10
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SG100646A1 (en) 2003-12-26

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