TWI263307B - A method of manufacturing semiconductor device having recess gate structure with varying recess width for increased channel length - Google Patents

A method of manufacturing semiconductor device having recess gate structure with varying recess width for increased channel length Download PDF

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TWI263307B
TWI263307B TW094146561A TW94146561A TWI263307B TW I263307 B TWI263307 B TW I263307B TW 094146561 A TW094146561 A TW 094146561A TW 94146561 A TW94146561 A TW 94146561A TW I263307 B TWI263307 B TW I263307B
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Taiwan
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layer
recessed hole
recessed
substrate
width
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TW094146561A
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TW200701403A (en
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Jong-Man Kim
Chang-Goo Lee
Jong-Sik Kim
Se-Ra Won
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Hynix Semiconductor Inc
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/28Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
    • H01L21/28008Making conductor-insulator-semiconductor electrodes
    • H01L21/28017Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
    • H01L21/28026Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
    • H01L21/28035Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities
    • H01L21/28044Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer
    • H01L21/28061Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer the conductor comprising a metal or metal silicide formed by deposition, e.g. sputter deposition, i.e. without a silicidation reaction
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment 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
    • H01L21/306Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/30604Chemical etching
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment 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
    • H01L21/306Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/3065Plasma etching; Reactive-ion etching
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment 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
    • H01L21/306Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/308Chemical or electrical treatment, e.g. electrolytic etching using masks
    • H01L21/3081Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof  ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/66007Multistep manufacturing processes
    • H01L29/66075Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66227Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
    • H01L29/66409Unipolar field-effect transistors
    • H01L29/66477Unipolar field-effect transistors with an insulated gate, i.e. MISFET
    • H01L29/66568Lateral single gate silicon transistors
    • H01L29/66613Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation
    • H01L29/66621Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation using etching to form a recess at the gate location

Description

1263307 九、發明說明: … 【發明所屬之技術領域】 - 本發明是關於半導體元件的製造方法,特別是具 有凹孔結構以增加通道長度的半導體元件製造方法。 【先前技術】 傳統平面結構的電晶體已經無法符合近來 _ DRAM元件高集積度的技術需求,舉例來說,傳統 的電晶體結構已經無法符合高集積度電晶體的臨界 目標。隨著DRAM元件集積度的增加必須縮小最小 特徵尺寸,而縮小最小特徵尺寸會造成基板摻雜濃度 增加’使得電場強度和電晶體的界面漏電流增加。 因此,有一種稱為’’凹孔閘極結構π的主動結構, 這種具有三度空間的結構可以降低基板摻雜濃度和 界面漏電流。 籲 傳統的凹孔閘極結構’其形成閘極的主動區為凹 陷結構,而閘極則形成在主動區的凹孔,藉以增加通 道長度。該傳統形成在主動區的凹孔閘極結構,可以 ^ 降低基板的摻雜濃度,並增加資料維持時間。而且隨 ' 著通道長度增加(由於該主動區的凹孔通道結構),可 以改善源極引發能障衰退(drain induced barvier lowering, DIBL)和崩潰電壓(breakdown voltages, BVds)的特性,並改善整個元件的特性。 1263307 由於凹孔通道結構可以延長f料維持時間,例如 大於2〇〇mS,因此可以預期在小於9〇nm的Dram 元件中會使用凹孔通道結構。 、,如上述,形成在主動區凹孔的凹孔通道結構閘極 會η這長度。可是當該主動區縮小時,通道長度 也會跟者減少’因此即使使用凹孔閘極結構所能增加 的效;也會党限。因此’會減少抑制界面漏電流的效 C以^兀件在更新特性上的改善。結果變得很難碟 ”…有縮』主動區的元件維持一致的可靠度和良率。 【發明内容】 因此,為了解決習知技術的上述和其他問題, 發明之目的在提供一種可以充分增加通道長度的半 導體元件製造方法。 :發明之另一個目的在提出一種可以充分增加 並::ί:半導體疋件製造方法,以有效降低漏電流 亚改善更新特性。 =了達到這個目的,本發明提出—種半導體元件 々广方法,該方法具有下列步驟:在半導體 ?成定義主動區的隔離層;在半導體基板上依序形成 :化層、多晶矽層和抗反射層;在抗反射層上形成定 基板凹孔區的保護圖形;以保護圖形作為餘刻 预:】虫刻抗反射層、多晶矽層和氧化層’藉此露出 預疋基板凹孔區;在敎基板凹孔區進行第一餘刻, 1263307 藉此开/成%•狀第—溝槽;去除保護圖形和抗反射層; 以姓刻的多晶秒層作為餘刻保護層,在第—溝槽底部 =基板抽進仃第二餘刻,藉此形成具有垂直側壁的 弟一溝槽,去除多晶矽層和氧化層;並在具有第二溝 槽的第一溝槽上形成閘極。 第一蝕刻最好使用HF,NH4F,HN03’ CH3CO〇H,Η2〇α h2〇的混合溶液來進行。混合 =含有卜50%的CH3C〇〇H溶液。而混合溶液也 含有1〜50%的hno、、六、六 〇3,夺液。弟一蝕刻的溫度最好介於 和1〇〇。(:之間以增加㈣m 第一溝槽的深度約為10〜1000A。 第々二贼刻最好是以含有服鳴ϋ和 的乳體來進行。而且第二乾钱刻是破壞第一溝槽 虫刻面晶格的電漿飯刻。 電漿姓刻的溫度介於抓和辦,壓力介於 中進一二:功率介於10和2000瓦並在低壓氣氛 仃。包漿蝕刻時選擇添加Ne,He,NH3,Kr, 入e和尺n Ji Φ夕„ PL· ,、甲之一的氣體作為催化氣體。 第二溝槽的深度約為300〜3000A。 件的Si:殺明的另—實施態樣,提出-種半導體元 切該方法具有下列步驟:在半導體基板 緣層;動區的隔離層;在半導體基板上形成絕 9 、巴、’ 4上形成定義預定基板凹孔區的保護圖 1263307 圖形作為_護層名虫刻 出預疋基板凹孔區;在預定基板凹孔區進行第一等向 性蚀刻,藉以形成第-溝槽;在第-溝槽底部的基板 ^伤進行第,乾❹卜藉以形成第二溝槽;並在具有 第一溝槽的第一溝槽上形成閘極。 第一等向性蝕刻最好是以hf,NH4F,hn〇3, ch3cooh ’ h2o2和h2〇的混合溶液來進行。混合
溶液含有!〜50%@叫⑺⑽溶液。而混合溶液也 含有1〜50%的HN〇3溶液。 第二乾蝕刻最好是以含有HBr,n2, Ar,Ne*
Cl的氣體來進行。而且第二乾蝕刻是破壞第一溝槽 飯刻面晶格的電漿蝕刻。 私漿蝕刻的溫度介於25。(:和700〇c,壓力介於 0.1〜100牦耳,功率介於1〇和2000瓦並在低壓氣氛 中進行。電漿蝕刻時選擇添加Ne,He,Nh3, Kr, Xe和Rn其中之一的氣體作為催化氣體。 【實施方式】 接下來本發明的較佳具體實施例將參考附圖說 明如下^ 第1 A-1E圖是根據本發明實施例說明製造半導 體元件方法的橫截面圖。 茶考第1A圖,在半導體基板1中形成由隔離層 2兩個部份所定義的主動區。然後,依序在半導體基 1263307 ^的主動區和部份的隔離層2上形成氧化層3和多 日日:層4。之後,在多晶石夕層4上形成抗反射層$, 亚在抗反射層5上形成保護圖形6以定義可以凹入 (或钱刻)基板1的區域。 在本貫把例中,多晶矽層4用來作為在基板i中 形成凹孔的保護層。然而,也可以使用例如氮化物声 的絕緣層來取代。 曰 _ 芩考第1B圖,使用保護圖形6作為蝕刻保護層 依序飿刻抗反射層5、多晶石夕層4和氧化層3,露出 基板1主動區中預計形成凹孔的區域。 芩考第1C圖,露出的基板區以保護圖形6作為 蝕刻保護層,經由第一等向性溼蝕刻在基板〗中形成 第一凹孔7。如第1C圖,第一凹孔7的底面形狀可 以疋原弧形或碗狀;也可以是銳角形或其他形狀。第 一凹孔7從基板1表面量起的深度約為1〇〜1〇〇〇人。 ❿ 之後去除凹孔閘極保護圖形6和抗反射層5。 第一等向性溼蝕刻所使用的溶液為的HF、 NH4F、hn〇33、ch3co〇h、h2o2 和 H2o 的混合溶 ^ 液。為了增加蝕刻反應性,蝕刻的溫度介於25。(2和 100QC。在蝕刻溶液中作為穩定劑的cHsCOOH溶 液’其含量佔整個溶液的1〜50%。而HN〇3則作為 CH3C〇〇H反應耗盡時的補充劑。因此,hn〇3溶液 的量佔整個蝕刻溶液的1〜50%。
1263307 參考第ID圖,第一凹孔7的底面部份經由第二 乾蝕刻,形成寬度比第一凹孔7小的第二凹孔8。第 二凹孔8的深度從基板1的表面量起約為 300 3000A。之俊’去除多晶石夕層4和氧化層3。第 一乾蝕刻使用含有HBr、N2、Ar、Ne和C1的氣體 來進行。 此外,第二乾蝕刻是破壞第一溝槽7蝕刻面晶格 的電漿蝕刻。電漿蝕刻的溫度介於25〇c* 7〇〇。〔, 壓力介於0.1〜100托耳,功率介於10和2〇〇〇瓦並 在低壓氣氛中進行。電漿蝕刻時,可以選擇Ne,He, ΝΗ3,^,ΧΜσ Rn其中之—的氣體作為催化氣體。 ’考第1E圖’在基板!具有第二凹孔8和第一 二孔7的主動區上形成閘極氧化層9。然後,在閘極 乳化層9上,依序形成閘極多晶砍層1()、閘極金屬 石夕化物層11和閘極保護層12。 之後,將閘極保護層12钱刻出圖形,並以姓刻 =閘極保護層12來㈣閘極保護層12下面的問極金 屬石夕化㈣η、閘極多㈣層1Q和閘極氧化層9, :匕在第#第—凹孔7、8中形成凹孔閘極如 弟1E圖)。 藉著依序進行一系列未圖 步驟,完成本發明實施例具有 元件。 示於圖中的習知製程 凹孔閘極13的半導體 11 1263307 的半S述:f本發明實施例具有凹孔閉極(例如13) ==牛製程中,基板的主動區(例如υ經由兩 们蝕刻步驟形成凹孔。因此,相較於 4 半導體元件,本發明半導體元# 、早人X丨的 的通道長度。 …件的凹孔間極具有較長 因此,藉由本發明在基板預計形成 的主動區區域,進行兩次㈣,即使縮小主動區) 可以確保足夠㈣道長度。因此,本發心以有效降 低界面漏電流並改善更新特性。0此,本發明可 由降低漏電流達到改善半導體元件良率、可曰 更新特性的效果。 >本發明上述最佳實施例僅作為解釋目的,對於 何熟悉此項㈣的a員都有可能在不偏離本 請範圍的條件下,進行的各種修改、 加。 文取代或附
12 1263307 【圖式fs〗单說明】 第1A〜1E圖是根據本發明實施例說明半導體元 件製造方法的橫截面圖。
【主要元件符號說明】 1 : 基板 2 : 隔離層 3 : 氧化層 4 : 多晶矽層 5 : 抗反射層 6 : 保護圖形 7 : 第一凹孔 8 : 第二凹孔 9 : 閘極氧化層 10 : 閘極多層石夕晶層 11 : 閘極金屬矽化物層 12 : 閘極保護層 13 : 凹孔閘極 13

Claims (1)

1263307 十、申請專利範圍: L 一種具有由隔離層所定義的主動區的半導體元件 製造方法,該方法具有下列步驟: 在半導體基板的主動區依序形成··(1)氧化層 或具有氮化物層的絕緣層;(2)多晶矽層;和(3") 抗反射層; 在抗反射層上形成定義預定基板凹孔區的保 護圖形; 藉由保護圖形兹刻抗反射層、多晶矽層和氧 化層或絶緣層’並露出預定基板的凹孔區; 在預定基板凹孔區進行第一蝕刻,形成具有 第一凹孔寬度和第一凹孔深度的第一凹孔; 去除保護圖形和抗反射層; 在第一凹孔的部份底面進行第二蝕刻,並以 蝕刻的多晶矽層作為蝕刻保護層,形成具有第二 凹孔莧度第二凹孔深度的第二凹孔,其中,第一 凹孔寬度比第二凹孔寬度寬; 去除多晶石夕層和氧化層;和 在第一和第二凹孔中形成閘極。 2·如申請專利範圍第i項的方法,其中第一蝕刻是 以具有 HF,NH4F,HN03,CH3COOH,H2〇2 和H2〇的混合溶液來進行。 3·如申請專利範圍第2項的方法,其中混合溶液含 有1〜50%的CH3C〇〇H溶液。 14 !2633〇7 4·如申請專利範圍第2項的方法’其中的混合溶液 含有1〜50%的ΗΝ〇3溶液。 5·如申請專利範圍第2項的方法,其中第一蝕刻步 驟的溫度介於25°C和1〇〇。(:。 6. =申請專利第1項的方法,其中從基板表面 量起的第一凹孔深度為10〜1000人。 7. 如申請專利範圍帛1項的方法,其中第二蝕刻步 • 驟是以含有HBr,N2, Ar,Ne和C1的氣體來進 行。 8. 如申請專利範圍第7項的方法,其中第二蝕刻步 驟為破壞第一凹孔蝕刻面晶格的電漿蝕刻。 9·如申請專利範圍第δ項的方法,其中電漿蝕刻的 /皿度介於25°C和700°C,壓力介於〇 jhoo托耳 ,功率介於10和2000瓦並在低壓氣氛中進行。 1〇·如申請專利範圍第8項的方法,其中,電漿蝕刻 • 可以選擇仏,He,NH3, Kr,以和Rn其中之 一的氣體作為催化氣體。 11· ^申請專利範圍第}項的方法,其中從基板表面 量起的第二凹孔深度為3〇〇〜3〇〇〇A。 • 12· —種具有由隔離層所定義的主動區的半導體元件 製造方法,該方法具有下列步驟: 在半導體基板上形成絕緣層; 在絕緣層上形成定義預定基板凹孔區的保護 15 1263307 圖形; 勉刻絕緣層以保護圖形作為蝕刻保護層,藉 以露出預定基板凹孔區; 在預定基板凹孔區進行第一等向性银刻,藉 以形成具有第一凹孔寬度和第一凹孔深度的第— 凹孔; 在弟一凹孔底部的基板部份進行第二乾餘 刻’藉以形成具有第二凹孔寬度和第二凹孔深度 的第二凹孔,其中第一凹孔寬度比第二凹孔的寬 度寬;以及 牡乐一和弟二凹孔中形成閘極。 13. 如申請專利範圍第12項的方法,其中第一等向性 钱刻是以具有 HF, ΝΗ4Ρ,ΗΝ〇3,^3〇ΧΚ)Η, Η2〇2和HaO的混合溶液來進行。 14. =申請專利㈣第13項的方法,其中的混合溶液 έ有1〜50%的CH3CO〇H溶液。 15♦如申請專利範圍第13項的方法, 人丄 J乃法,其中的混合溶液 含有1〜50%的HN〇3溶液。 1”申請專利範圍第12項的方法,其中第二乾飯刻 =含有服’…’知和⑽中的氣體來 進仃。 如申請專利範圍第16項的方 at. g . _ /去其中弟二乾蝕刻 步私疋破壞第一凹孔蝕刻面曰 4 ^日日格的電漿姓刻。 16
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