TWI569305B - 用於形成微帶傳輸線於薄矽晶絕緣體晶片上的方法及結構 - Google Patents
用於形成微帶傳輸線於薄矽晶絕緣體晶片上的方法及結構 Download PDFInfo
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- TWI569305B TWI569305B TW103139367A TW103139367A TWI569305B TW I569305 B TWI569305 B TW I569305B TW 103139367 A TW103139367 A TW 103139367A TW 103139367 A TW103139367 A TW 103139367A TW I569305 B TWI569305 B TW I569305B
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- ruthenium
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- 238000000034 method Methods 0.000 title claims description 22
- 230000005540 biological transmission Effects 0.000 title claims description 16
- 239000012212 insulator Substances 0.000 title claims description 6
- 235000012431 wafers Nutrition 0.000 title description 21
- 229910052710 silicon Inorganic materials 0.000 title 1
- 239000010703 silicon Substances 0.000 title 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 75
- 229910052732 germanium Inorganic materials 0.000 claims description 72
- 239000004020 conductor Substances 0.000 claims description 37
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 35
- 229910052707 ruthenium Inorganic materials 0.000 claims description 35
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 claims description 31
- 229910052715 tantalum Inorganic materials 0.000 claims description 19
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 19
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 7
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 claims description 4
- 229940119177 germanium dioxide Drugs 0.000 claims description 2
- 229910001925 ruthenium oxide Inorganic materials 0.000 claims 1
- 239000000758 substrate Substances 0.000 description 14
- 229910000449 hafnium oxide Inorganic materials 0.000 description 8
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 3
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- NQKXFODBPINZFK-UHFFFAOYSA-N dioxotantalum Chemical compound O=[Ta]=O NQKXFODBPINZFK-UHFFFAOYSA-N 0.000 description 2
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
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Description
本揭示大致上關於半導體結構及製造方法,特別關於在矽晶絕緣體(SOI)晶片上之例如GaN等薄的III-V材料上形成微帶傳輸線之方法及結構。
如同此技藝中所知般,有時在配置於絕緣體基底上的矽層中形成CMOS(互補金屬氧化物半導體)電晶體。在一結構中,在厚度約725微米的具有<100>晶向的經過摻雜之矽基底晶片上執行這些CMOS裝置的製造。晶片具有在基底的上表面上1400-2000厚的二氧化矽層以及在二氧化矽層上1-2微米厚的單晶矽層。晶片被處理以在上矽層中形成CMOS電晶體。使用經過摻雜的基底以降低晶片斷裂。
如同此技藝中所知般,有時希望在基底上形成III-V裝置以作為單石微波積體電路(MMIC)。在一此結構
中,例如厚度約725微米之8吋的<111>矽之矽晶片等矽晶片具有使用MOCVD或MBE而形成於上表面上之例如GaN等III-V材料層。在MMIC中,微帶傳輸線有時用以互連形成於III-V層中或上之例如FET裝置等主動裝置及被動裝置。在此情形中,在由微帶傳輸線形成FET及帶式導體之後,必須將725微米厚的晶片薄化或拋光至50-100微米以用於將形成於晶片背側上之微帶傳輸線接地平面導體、以及容納從接地平面通至FET的電極之導電通路。但是,晶片背側的薄化或拋光以及從晶片背側形成通路之製程難以控制。此外,低損失高頻傳輸線所需的高電阻<111>矽受到較高度的晶片斷裂。這是因為高電阻(>500Ω-cm)所需的Si之低氧含量使得矽更易脆。
根據本揭示,提供具有下述之結構:第一矽層;絕緣層;及第二矽層,絕緣層配置於第一矽層與第二矽層之間,第二矽層比第一矽層厚;III-V層,配置於第一矽層的上表面上。
在一實施例中,第一矽層具有<111>晶向。
在一實施例中,第一矽層具有50-100微米的厚度。
在一實施例中,第一矽層經過刻意地或非刻意地摻雜。
在一實施例中,第二矽層具有675-625微米的厚度。
在一實施例中,第二矽層具有的摻雜濃度高於第一矽
層的摻雜濃度。
在一實施例中,絕緣層包括二氧化矽。
在一實施例中,提供方法,方法包括設置結構,結構具有:(A)第一矽層及在第一矽層上的第一二氧化矽層;及(B)第二矽層及在第二矽層上的第二二氧化矽層;第一二氧化矽層接合至第二二氧化矽層。將第一矽層的上表面拋光以降低其厚度。III-V層生長於薄化的矽層之上表面上。III-V裝置與帶式導體一起形成於III-V層中,帶式導體連接至形成的裝置及穿過III-V層及第一矽層的導電通路。連續地移除第二矽層、第二二氧化矽層及第一二氧化矽層以曝露第一矽層的底表面。接地平面導體形成於曝露的底表面上,帶式導體及接地平面導體提供微帶傳輸線。
在一實施例中,方法包含:(A)設置結構,結構具有:第一矽層;絕緣層;及第二矽層,絕緣層配置在第一矽層與第二矽層之間,第二矽層比第一矽層厚;以及,III-V層,配置於第一矽層之上表面上;(B)在III-V層中形成III-V裝置與連接至裝置的帶式導體;(C)移除絕緣層及第二矽層以曝露第一矽層的底表面;及(D)在曝露的第一矽層底表面上形成接地平面導體,連接成與帶式導體提供微帶傳輸線。
在一實施例中,提供具有矽層及在矽層上的二氧化矽層之第一結構,提供具有矽層及在矽層上的二氧化矽層之第二結構;第一結構的二氧化矽層接合至第二結構的二氧
化矽層,以形成層疊結構。將第一結構的矽層的上表面拋光以將第一結構的矽層的厚度降低至50-100微米;III-V層,生長於層疊結構的第一結構的薄化的矽層之上表面上。III-V裝置與帶式導體一起形成於III-V層中,帶式導體連接至III-V層表面上的形成裝置及導電通路,導電通路連接至裝置及穿過第一結構的III-V層及矽層。將第二結構及第一結構上的二氧化矽層從第一結構的矽層移除,以曝露第一矽層的底表面。在第一結構的曝露的矽層底表面上,形成接地平面導體,帶式導體及接地平面導體提供微帶傳輸線。
在附圖及下述說明中顯示本揭示的一或更多實施例的細節。從說明、圖式及申請專利範圍,習於此技藝者將清楚本揭示之其它特徵、目的及優點。
10‧‧‧第一結構
20‧‧‧第二結構
24‧‧‧層疊結構
32‧‧‧帶式導體
36‧‧‧導電通路
圖1A-1H是根據揭示之製造時不同階段之半導體結構的剖面圖;圖2是流程圖,顯示根據揭示之用以形成圖1A-1H之結構的製程;圖3是根據揭示之替代實施例的製程流程圖;圖4A-4K是根據圖3之替代實施例之製造時不同階段之半導體結構的剖面圖。
在不同圖中類似的代號表示類似元件。
現在參考圖1A及圖2的步驟100,取得第一結構10,第一結構10具有:矽層12,具有725微米的額定厚度、<111>晶向,及輕度摻雜,較佳的是n型,以具有>500歐姆-cm的電阻率;在矽層12上的二氧化矽層14。如同所示,選加的蝕刻截止層16沈積於二氧化矽層14與矽層12之間,此處,舉例而言,蝕刻截止層16為Al2O3。
現在參考圖1B及圖2的步驟200,取得第二結構20,第二結構20具有:矽層18,625-675微米厚,及更高度摻雜;以及,在矽層上的二氧化矽層22。
現在參考圖1C及圖2的步驟300,第一結構10的二氧化矽層14接合至第二結構20的二氧化矽層22以形成層疊結構24。
現在參考圖1D及圖2的步驟400,將第一結構的矽層12(圖1C)的上表面拋光以將矽層12的厚度縮減成更薄的矽層12’(圖1D),此處為50-100微米厚。
接著,參考圖1E及圖2的步驟500,舉例而言,藉由MOCVD或MBE,在薄化的矽層12’的上表面上,生長例如GaN等III-V族材料層26。
接著,參考圖1F及圖2的步驟600,III-V裝置30,舉例而言,在III-V層26中形成GaN HEMT FET主動裝置以及帶式導體32和導電通路36,帶式導體32連接至裝置26及被動裝置34,導電通路36連接至例如未顯示
之裝置26的源極電極等電極(注意,在圖2中既未顯示閘極電極也未顯示汲極電極)以及垂直穿過III-V層26和較薄矽層12’的下方部份,最後停止於較薄的矽(層12’)與下方介電質之間的介面,下方介電質可為SiO2(層14)或是選加的Al2O3層(層16)。
接著,將圖1F及圖2的步驟700所示的層疊結構上下顛倒置於未顯示的暫時載具上,以藉由例如拋光或蝕刻等來移除矽層18、然後二氧化矽層22、然後二氧化矽層14、最後是選加的Al2O3層16(假使存在時),以曝露薄化的矽層12的底表面。圖1G顯示結果的結構。
接著,參考圖1H及圖2的步驟800,在薄化的矽層12’的底表面上形成接地平面導體40;帶式導體32及接地平面導體40提供微帶傳輸線。在大部份的情形中,接著將完成的結構移離暫時載具。
應瞭解,已指明第二Si結構(層18)為625-725μm厚(不是SEMI國際標準,San Joe 3081 Zanker Road San Jose,CA 95134,USA,對於200mm晶片之725μm),以補償第一Si結構(層12)的厚度100-50μm。這使得最後接合的晶片堆疊的整體厚度將接近用於200mm晶片之額定725μm的半導體標準厚度,因而避免目前標準的處理工具中晶片處理的議題。
厚的接合頂部Si或化合物半導體層的主要目的是使製造廠所需的背側處理最小以利於微帶裝置。亦即,可以從正面蝕刻及金屬化源極通路。結果,僅需要最小的背側
處理以便於高產能微帶製程。基底設計的次級目的是消除導因於Si基底上低氧含量、高電阻<111>GaN的處理之晶片斷裂。
現在參考圖3及圖4A-4K,說明替代實施例。此處,提供725微米的<111>、>500歐姆-cm晶片(圖4A),以及,其是在步驟1000(圖3)中在III-V(例如GaN)層26(圖4B)的上表面生長。接著,以例如二氧化矽等適當的暫時接合材料42,將GaN層26接合至暫時操作基底42(圖4C)(步驟2000),而曝露<111>矽晶片12的底表面。接著,將晶片12曝露的底表面拋光或研磨,以將矽層12的厚度縮減至50-100微米的厚度(圖4A、步驟3000)。接著,在薄化的矽層12”的底表面上形成二氧化矽層14,注意,在形成二氧化矽層14之前,Al2O3(層16)的層形成於薄化的矽晶片12”的底表面上(圖4E,步驟4000),藉以形成第一結構。接著,取得第二結構20(圖4F),第二結構20具有:矽層18,625或675微米厚,<100>及高度摻雜;以及,在矽層18上的二氧化矽層22,步驟5000。接著,參考圖4G及步驟600,第一結構的二氧化矽層14接合至第二結構的二氧化矽層22,以形成層疊結構。接著,參考圖4H,移除暫時操作基底。接著,在GaN層30中形成半導體裝置30(圖4I)以及帶式導體(未顯示)、和導電通路36,如同配合圖1F之上述所述般,帶式導體連接至GaN層26的表面上之形成的裝置30,導電通路36連接至裝置30以及穿過GaN層26及
矽層12”(圖4I,步驟700)。接著,順序地移除矽層18、二氧化矽層22、二氧化矽層14、以及Al2O3層16(假使存在時),以曝露矽層12”的底表面(圖4J,步驟800)。接著,在薄化矽層(16,步驟9000)的曝露的底表面上,形成接地平面導體40(圖4K,步驟9000)。
在另一實施例中,矽層12的上表面(圖1)接合至暫時操作基底,然後,將矽層的底表面薄化。然後,選加的Al2O3層16及二氧化矽層14形成於薄化矽層的底表面上,形成第一結構。第二結構的二氧化矽層接合至第一結構的二氧化矽層。然後,移除暫時操作基底,曝露較薄的矽層之上表面。接著在薄化的矽層的曝露上表面中,生長GaN層。然後,如同參考圖1F至1H之上述所述般,處理結構。
現在應瞭解,根據揭示的結構包含第一矽層;絕緣層;第二矽層,絕緣層配置於第一矽層與第二矽層之間,第二矽層比第一矽層厚;III-V層,配置於第一矽層的上表面上。結構包含與要包含的另一特點獨立或相結合之下述特點之一或更多:其中,第一矽層具有<111>晶向;其中,第一矽層具有50-100微米的厚度;其中,第一矽層經過刻意或非刻意地摻雜;其中,第一矽層是n型摻雜,具有>500歐姆-cm的電阻率;其中,第二矽層具有675-625微米的厚度;其中,第二矽層具有的摻雜濃度高於第一矽層的摻雜濃度;其中,絕緣層包括二氧化矽。
現在應瞭解,根據揭示的方法包含:設置結構,結構
包括:第一矽層;在第一矽層上的第一絕緣層;第二矽層;在第二矽層上的第二絕緣層;其中,第一絕緣層接合至第二絕緣層;以及,包含縮減第一矽層的厚度;在第一矽層的上表面上形成III-V層;在III-V層中形成III-V裝置,以帶式導體連接至形成的裝置;以及,在第一矽層的底表面上形成接地平面導體,帶式導體及接地平面導體提供微帶傳輸線。方法包含與要包含的另一特點獨立或相結合之下述特點之一或更多:其中,在第一絕緣層沈積之前,縮減第一矽層的厚度;其中,在縮減第一矽層的厚度之前,在第一矽層上形成III-V層;其中,接續在將第一絕緣層接合至第二絕緣層之後,III-V層形成於第一矽層上;其中,第一矽層縮減至50-100μm的厚度;其中,接續在第一絕緣層沈積之後,縮減第一矽層的厚度;其中,接續在將絕緣層接合至第二絕緣層之後,III-V層形成於第一矽層上;其中,第一矽層縮減至50-100μm的厚度。
已說明揭示的多個實施例。然而,將瞭解,在不悖離揭示的精神及範圍之下,可以作各式各樣的修改。舉例而言,晶片接合中使用的所有氧化物可以沈積或生長於第一Si結構(層12)或第二Si結構(層18)上,然後接合至裸Si晶片的原生氧化物。此外,第一矽層、第二矽層、及氧化物層的厚度可以從上述厚度改變且仍落在本揭示的精神及範圍之內。再者,其它的薄矽層(典型地1-2μm)可以接合至厚的675-625μm的Si基底及50-100μm的<111>Si之頂部上,以形成三層基底,允許在窗口(曝露的<111>Si
區)中生長GaN和CMOS處理以及相同基底上的GaN裝置處理。這接著將允許異質集成的GaN/CMOS電路。因此,其它實施例在後述申請專利範圍的範圍之內。
12’‧‧‧矽層
26‧‧‧GaN層
30‧‧‧GaN層
32‧‧‧帶式導體
34‧‧‧被動裝置
36‧‧‧導電通路
40‧‧‧接地平面導體
Claims (17)
- 一種用於形成微帶傳輸線於薄矽晶絕緣體晶片上的結構,包含:第一矽層;第一絕緣層,配置於該第一矽層下;第二絕緣層;第二矽層,配置於該第二絕緣層下,其中該第一絕緣層直接接合至該第二絕緣層;其中該第二矽層比該第一矽層厚;以及其中該第二矽層比該第一矽層重度摻雜以及其中,該第一矽層具有<111>晶向以及該第二矽層具有<100>晶向。
- 如申請專利範圍第1項之結構,其中,該第一矽層具有50-100微米的厚度。
- 如申請專利範圍第1項之結構,其中,該第一矽層經過刻意地或非刻意地摻雜。
- 如申請專利範圍第1項之結構,其中,該第一矽層是n型摻雜的,具有>500歐姆-cm的電阻率。
- 如申請專利範圍第2項之結構,其中,該第二矽層具有625-675微米的厚度。
- 如申請專利範圍第1項之結構,包括III-V層於該第一矽層上。
- 如申請專利範圍第1項之結構,其中,該第一絕緣層以及該第二矽層包括二氧化矽。
- 一種用於形成微帶傳輸線於薄矽晶絕緣體晶片上的方法,包含:設置第一結構,具有:第一矽層以及第一二氧化矽層,該第一矽層配置於該第一二氧化矽層上;設置第二結構,具有:第二二氧化矽層,配置於第二矽層上,該第二矽層比該第一矽層重度摻雜;將該第一二氧化矽層接合至該第二二氧化矽層;拋光該第一矽層的上表面以縮減該第一矽層的厚度到少於該第二矽層的厚度之厚度;在該減薄的第一矽層的上表面上形成III-V層;在該III-V層中形成III-V裝置,並以帶式導體連接至該形成的裝置;以及,連續地移除該第二矽層、該第二二氧化矽層及該第一二氧化矽層以曝露該第一矽層的底表面。
- 一種用於形成微帶傳輸線於薄矽晶絕緣體晶片上的方法,包含:(A)設置第一結構,具有:第一矽層以及第一絕緣層,該第一矽層配置於該第一絕緣層上;(B)設置第二結構,具有:第二矽層以及第二絕緣層,該第二絕緣層配置於該第二矽層上;(C)將該第一絕緣層接合至該第二絕緣層;(D)縮減該第一矽層的厚度到少於該第二矽層的厚度之厚度;(E)在該縮減厚度的第一矽層的上表面上形成III-V 層;(F)在該III-V層中形成III-V裝置,且帶式導體連接至該裝置;以及,(G)移除該第二矽層、該第二絕緣層、該第一絕緣層、及該第二矽層以曝露該第一矽層的底表面。
- 如申請專利範圍第8項之方法,其中,該拋光該第一結構的該矽層的上表面縮減該第一結構的該矽層的該厚度到50-100μm之厚度。
- 如申請專利範圍第8項之方法,包括在該III-V層中形成該III-V裝置並以該帶式導體連接至該形成的裝置在該III-V層的表面上以及導電通孔至該裝置和透過該III-V層和該第一結構的該矽層兩者。
- 如申請專利範圍第8項之方法,包括在該第一結構的該矽層的該曝露的底表面上形成接地平面導體,該帶式導體及該接地平面導體提供微帶傳輸線。
- 如申請專利範圍第9項之方法,包括在該第一矽層的該曝露的底表面上形成接地平面導體,該第一矽層被連接以提供微帶傳輸線給該帶式導體。
- 如申請專利範圍第9項之方法,其中,該第二矽層具有摻雜濃度高於該第一矽層的摻雜濃度。
- 如申請專利範圍第1項之結構,包括一層Al2O3,配置於該第一矽層以及該第二矽層之間。
- 如申請專利範圍第8項之方法,包括在該第一絕緣層的該形成之前,於該第一矽層上形成一層Al2O3,以 配置該層Al2O3於該第一絕緣層以及該第一矽層之間。
- 如申請專利範圍第9項之方法,包括在該第一絕緣層的該形成之前,於該第一矽層上形成一層Al2O3,以配置該層Al2O3於該第一絕緣層以及該第一矽層之間。
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