JP2019029639A - ダイナミックランダムアクセスメモリ及びその製造方法 - Google Patents
ダイナミックランダムアクセスメモリ及びその製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 claims abstract description 93
- 238000002955 isolation Methods 0.000 claims description 28
- 239000003989 dielectric material Substances 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 155
- 238000000034 method Methods 0.000 description 61
- 239000003990 capacitor Substances 0.000 description 23
- 239000011810 insulating material Substances 0.000 description 20
- 239000000463 material Substances 0.000 description 15
- 238000005530 etching Methods 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 229910052814 silicon oxide Inorganic materials 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- 229910052581 Si3N4 Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 229910001092 metal group alloy Inorganic materials 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000002070 nanowire Substances 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
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- 239000010937 tungsten Substances 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
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- 239000000956 alloy Substances 0.000 description 1
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- 238000005468 ion implantation Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
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Abstract
【解決手段】ダイナミックランダムアクセスメモリは、基板10と、分離構造9と、埋め込みワード線構造26と、複数の第1のフィン構造とを含む。分離構造は、基板に設けられ、第1の方向に列状に配置された複数の活性領域38(凸部)を定義する。埋め込みワード線構造は、基板中に位置し、第1の方向に沿って延び、複数の活性領域と分離構造とを跨ぐ。複数の第1のフィン構造は、複数の活性領域と埋め込みワード線構造との交差領域に位置し、第1の方向に列状に配置され、埋め込みワード線構造により覆い囲まれる。
【選択図】図15
Description
6:パターン化マスク層
7:ワード線領域
8:活性領域
9:分離構造
10:基板
10a:第1の凸部
10b:第2の凸部
10c:第3の凸部
10d:第4の凸部
11:マスク層
12:ハードマスク層
12a:パターン化ハードマスク層
13、13a、13b、13c:トレンチ
14:開口
15、15a、15b:ライナー
16:ワード線トンネル
16a:第1のワード線トンネル
16b:第2のワード線トンネル
17:フィン構造
17a:第1のフィン構造
17b:第2のフィン構造
18:ゲートトレンチ
19:ゲート誘電体層
20:遮蔽構造
20a:第1の遮蔽構造
20b:第2の遮蔽構造
21、21a:第1の導電層
22、22a:第2の導電層
23、23a:導電層
24:誘電体層
25a:第1の埋め込みゲート構造
25b:第2の埋め込みゲート構造
25c:第3の埋め込みゲート構造
26:埋め込みワード線構造
27:絶縁構造
30:ソース及びドレイン領域
32:キャパシタコンタクト
33:ビット線コンタクト
34:ビット線
35:キャパシタ
36、37:誘電体層
38:凸部
39:凹部
R1、R2:活性領域列
Claims (17)
- 基板と、
前記基板中に位置し、第1の方向に沿って列状に配置された複数の活性領域を定義する、分離構造と、
前記基板中に位置し、前記第1の方向に沿って延び、前記複数の活性領域と前記分離構造を跨ぐ、埋め込みワード線構造と、
前記活性領域と前記ワード線構造との交差領域に位置し、前記第1の方向に沿って列状に配置され、前記埋め込みワード線構造により覆い囲まれる、複数の第1のフィン構造と
を含む
ダイナミックランダムアクセスメモリ。 - 前記埋め込みワード線構造が導電層を含み、前記複数の第1のフィン構造が前記導電層により覆い囲まれる、
請求項1に記載のダイナミックランダムアクセスメモリ。 - 前記埋め込みワード線構造が、前記複数の第1のフィン構造と前記基板との間に位置する複数の絶縁構造をさらに含む、
請求項2に記載のダイナミックランダムアクセスメモリ。 - 前記埋め込みワード線構造の前記導電層が、前記複数の第1のフィン構造の表面と側壁と、前記複数の絶縁構造の側壁とを覆う、
請求項3に記載のダイナミックランダムアクセスメモリ。 - 前記複数の第1のフィン構造の下方に位置する複数の第2のフィン構造をさらに含み、前記複数の第1のフィン構造と前記複数の第2のフィン構造が共に前記埋め込みワード線構造中に位置し、前記埋め込みワード線構造により覆い囲まれる、
請求項1に記載のダイナミックランダムアクセスメモリ。 - 第1のワード線トンネルを有する基板と、
前記第1のワード線トンネルの上方で前記基板中に位置し、その側壁と底面が前記基板により覆われ、その上面が誘電体層により覆われた、第1の埋め込みゲート構造と、
前記第1のワード線トンネルの表面を少なくとも覆う、誘電体材料層と
を含む、
ダイナミックランダムアクセスメモリ。 - 前記第1のワード線トンネル中に位置する導電層をさらに含み、前記誘電体材料層がゲート誘電体層であり、前記誘電体材料層が前記導電層と共に第2の埋め込みゲート構造を形成する、
請求項6に記載のダイナミックランダムアクセスメモリ。 - 前記誘電体材料層が、絶縁構造として、前記第1のワード線トンネルを完全に満たす、
請求項6に記載のダイナミックランダムアクセスメモリ。 - 前記基板が前記第1のワード線トンネルの下方の第2のワード線トンネルをさらに有し、前記第2のワード線トンネルと前記第1のワード線トンネルとが互いに接続しない、
請求項7に記載のダイナミックランダムアクセスメモリ。 - 前記第2のワード線トンネル中に位置し、前記基板により覆い囲まれた、第3の埋め込みゲート構造をさらに含み、前記基板において上から順に、前記第1の埋め込みゲート構造、前記第2の埋め込みゲート構造、前記第3の埋め込みゲート構造が配置された、
請求項9に記載のダイナミックランダムアクセスメモリ。 - 基板を提供することと、
前記基板が凸部と凹部を含むよう、前記基板の一部を除去することと、
前記基板中に第1のワード線トンネルを形成するため、前記凸部の第1の凸部を保護し、前記第1の凸部の下方の第2の凸部を除去することと、
ゲートトレンチと第1のフィン構造を形成するため、前記第1の凸部の一部を除去することと、
ゲート誘電体層と導電層の形成を含む、前記ゲートトレンチに第1の埋め込みゲート構造を形成することと
を含む、
ダイナミックランダムアクセスメモリの製造方法。 - 前記第1の埋め込みゲート構造が形成されたとき、前記第1のワード線トンネル中に第2の埋め込みゲート構造を形成することをさらに含む、
請求項11に記載のダイナミックランダムアクセスメモリの製造方法。 - 前記第1の埋め込みゲート構造が形成される前に、前記第1のワード線トンネル中に絶縁構造を形成することをさらに含む、
請求項11に記載のダイナミックランダムアクセスメモリの製造方法。 - 前記第1のワード線トンネルが形成された後で且つ前記第1の凸部の一部が除去される前に、前記基板中に第2のワード線トンネルと第2のフィン構造を形成するため、前記凸部の第3の凸部を保護し、前記第3の凸部の下方の前記凸部の第4の凸部を除去することをさらに含む、
請求項12に記載のダイナミックランダムアクセスメモリの製造方法。 - 前記第1の埋め込みゲート構造と前記第2の埋め込みゲート構造が形成されるとき、前記第2のワード線トンネル中に第3の埋め込みゲート構造を形成することをさらに含み、
前記第3の埋め込みゲート構造を形成することが、ゲート誘電体層と導電層を形成することを含む、
請求項14に記載のダイナミックランダムアクセスメモリの製造方法。 - 前記第3の凸部を保護することが、前記第3の凸部の側壁上にライナーを形成することを含む、
請求項14に記載のダイナミックランダムアクセスメモリの製造方法。 - 前記第1の凸部を保護することが、前記第1の凸部の側壁上にライナーを形成することを含む、
請求項11に記載のダイナミックランダムアクセスメモリの製造方法。
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