JP7480190B2 - 3次元メモリデバイスおよびその製造方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims description 82
- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 230000000903 blocking effect Effects 0.000 claims description 61
- 239000004065 semiconductor Substances 0.000 claims description 48
- 230000005641 tunneling Effects 0.000 claims description 46
- 239000000758 substrate Substances 0.000 claims description 45
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 7
- 238000000231 atomic layer deposition Methods 0.000 claims description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 7
- 150000004767 nitrides Chemical class 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 239000000945 filler Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 28
- 239000000463 material Substances 0.000 description 13
- 238000013459 approach Methods 0.000 description 6
- 238000005137 deposition process Methods 0.000 description 6
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 3
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Description
12 誘電体層
14 犠牲層
20 エピタキシャル層
21 ベース層
22 ブロッキング層
24 トラッピング層
24A 下側部分
24B 上側部分
26 トンネリング層
30 半導体層
32 充填層
34 導電性構造体
40 キャップ層
50 導電性層
60 マスク層
91 酸化プロセス
92 エッチングプロセス
100 3Dメモリデバイス
D1 垂直方向
D2 水平方向
OP1 第1の開口部
OP2 第2の開口部
S1 交互の誘電体スタック
S2 交互の導電性/誘電体スタック
SW 側壁部
TK1 第1の厚さ
TK2 第2の厚さ
W1 底部幅
W2 上部幅
Claims (17)
- 基板と、
前記基板の上に配設されている交互の導電性/誘電体スタックと、
前記基板の上に配設されているエピタキシャル層と、
前記エピタキシャル層の上に配設されており、前記交互の導電性/誘電体スタックによって取り囲まれているブロッキング層と、
前記ブロッキング層の上に配設されており、前記ブロッキング層によって取り囲まれて、窒化ケイ素を含むトラッピング層と、
前記トラッピング層の上に配設されており、前記トラッピング層によって取り囲まれているトンネリング層と、
前記エピタキシャル層の上に前記エピタキシャル層と接触して配設されている半導体層であって、前記半導体層は、前記トンネリング層の上に部分的に配設されており、前記トンネリング層によって取り囲まれている、半導体層と
を備え、
前記トラッピング層は、
水平方向の部分と、
垂直方向の部分とを含み、前記水平方向の部分は、前記半導体層と接触しており、
前記垂直方向の部分は、
下側部分と、
前記下側部分の上方に配設されている上側部分であって、水平方向における前記上側部分の厚さは、前記水平方向における前記下側部分の厚さよりも大きい、上側部分と
を含み、
前記下側部分におけるシリコンに対する窒素の比(N/Si)は、前記上側部分におけるシリコンに対する窒素の比(N/Si)よりも低くなっている、3次元(3D)メモリデバイス。 - 前記トラッピング層および前記エピタキシャル層は、所定の距離に配設されている、請求項1に記載の3Dメモリデバイス。
- 前記トラッピング層および前記エピタキシャル層は、前記ブロッキング層によって分離されている、請求項1に記載の3Dメモリデバイス。
- 前記トラッピング層は、断面視においてL字形状を含む、請求項1に記載の3Dメモリデバイス。
- 前記半導体層は、前記水平方向の部分を介して前記トラッピング層を貫通している、請求項1に記載の3Dメモリデバイス。
- 前記水平方向における前記下側部分の前記厚さに対する、前記水平方向における前記上側部分の前記厚さの比は、1.25から2の範囲にある、請求項1に記載の3Dメモリデバイス。
- 前記トラッピング層の厚さは、前記下側部分から前記上側部分に向けて徐々に増加されている、請求項1に記載の3Dメモリデバイス。
- 前記半導体層の上に配設されており、前記半導体層によって取り囲まれている充填層と、
前記充填層の上に配設されており、前記半導体層と接触している導電性構造体と
をさらに備える、請求項1に記載の3Dメモリデバイス。 - 3次元(3D)メモリデバイスの製造方法であって、
基板の上に交互の誘電体スタックを形成するステップと、
前記基板の厚さ方向に前記交互の誘電体スタックを貫通し、前記基板を露出させる第1の開口部を形成するステップと、
前記第1の開口部を介して前記基板の上にエピタキシャル層を形成するステップと、
前記第1の開口部を介して、前記エピタキシャル層および前記第1の開口部の側壁部の上に、ブロッキング層、窒化ケイ素を含むトラッピング層、およびトンネリング層を順に形成するステップと、
前記ブロッキング層、前記トラッピング層、および前記トンネリング層を貫通し、前記エピタキシャル層を露出させる第2の開口部を形成するステップと、
前記第1の開口部を介して、前記エピタキシャル層、前記第2の開口部の側壁部、前記トンネリング層の一部、および、前記第1の開口部の前記側壁部の上に、半導体層を形成するステップであって、前記半導体層は、前記エピタキシャル層と接触している、ステップと
を含み、
前記トラッピング層は、
水平方向の部分と、
垂直方向の部分とを含み、前記水平方向の部分は、前記半導体層と接触しており、
前記垂直方向の部分は、
下側部分と、
前記下側部分の上方に配設されている上側部分であって、水平方向における前記上側部分の厚さは、前記水平方向における前記下側部分の厚さよりも大きい、上側部分と
を含み、
前記下側部分におけるシリコンに対する窒素の比(N/Si)は、前記上側部分におけるシリコンに対する窒素の比(N/Si)よりも低くなっている、製造方法。 - 前記第1の開口部を介して、前記半導体層によって取り囲まれている充填層を形成するステップと、
前記充填層の上に前記半導体層と接触して導電性構造体を形成するステップと
をさらに含む、請求項9に記載の製造方法。 - 前記第1の開口部を形成するときに、前記基板の一部が除去され、前記エピタキシャル層が、前記基板の中に形成される、請求項9に記載の製造方法。
- 前記第1の開口部の前記側壁部の上への前記ブロッキング層、前記トラッピング層、または前記トンネリング層の堆積は、原子層堆積(ALD)プロセスを含む、請求項9に記載の製造方法。
- 前記第2の開口部を形成するステップは、
前記トンネリング層の前記一部を覆うマスク層を形成するステップと、
前記マスク層を介して、前記トンネリング層、前記トラッピング層、および前記ブロッキング層を通してエッチングし、前記エピタキシャル層を露出させ、前記第2の開口部を形成するステップと
をさらに含む、請求項9に記載の製造方法。 - 前記ブロッキング層を形成するステップは、
前記エピタキシャル層および前記第1の開口部の前記側壁部の上にベース層を形成するステップと、
前記ベース層に対して酸化プロセスを実施し、前記ブロッキング層を形成するステップと
をさらに含む、請求項9に記載の製造方法。 - 前記ベース層は、窒化物層を含む、請求項14に記載の製造方法。
- 前記酸化プロセスは、インサイチュ蒸気発生(ISSG)プロセスまたは熱酸化プロセスを含む、請求項14に記載の製造方法。
- 前記ベース層は、酸化物層と、前記酸化物層の上に配設されている窒化物層とを含み、前記窒化物層は、前記酸化プロセスによって酸化される、請求項14に記載の製造方法。
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