JP2022538396A - 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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Abstract
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 (20)
- 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する開口部を形成するステップと、
前記開口部の側壁部の上にブロッキング層を形成するステップと、
前記開口部の中にトラッピング層を形成するステップであって、前記トラッピング層は、前記ブロッキング層の上に形成され、前記トラッピング層は、
下側部分、および、
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
を含む、ステップと
を含む、3Dメモリデバイスの製造方法。 - 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メモリデバイスの製造方法。
- 前記トラッピング層の前記下側部分は、前記基板の前記厚さ方向に前記トラッピング層の前記上側部分と前記基板との間に配設されている、請求項1に記載の3Dメモリデバイスの製造方法。
- 前記水平方向は、前記基板の前記厚さ方向に直交している、請求項1に記載の3Dメモリデバイスの製造方法。
- 前記開口部の上部幅は、前記開口部の底部幅よりも大きい、請求項1に記載の3Dメモリデバイスの製造方法。
- 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メモリデバイスの製造方法。
- 前記ブロッキング層の形成方法は、
前記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するステップであって、前記ベース層は、前記酸化プロセスによって酸化され、前記ブロッキング層になる、ステップと
を含む、請求項1に記載の3Dメモリデバイスの製造方法。 - 前記開口部の中にトンネリング層を形成するステップであって、前記トンネリング層は、前記開口部の中の前記トラッピング層の上に形成される、ステップと、
前記開口部の中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、前記基板の前記厚さ方向に細長くなっており、前記半導体層は、前記水平方向に、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によって取り囲まれている、ステップと
をさらに含む、請求項1に記載の3Dメモリデバイスの製造方法。 - 前記開口部の中に充填層を形成するステップであって、前記充填層は、前記水平方向に、前記半導体層、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によって取り囲まれている、ステップ
をさらに含む、請求項8に記載の3Dメモリデバイスの製造方法。 - 前記交互の誘電体スタックは、前記基板の前記厚さ方向に交互に積層されている誘電体層および犠牲層を含み、前記3Dメモリデバイスの前記製造方法は、
前記半導体層を形成する前記ステップの後に、交互の導電性/誘電体スタックを形成するように、前記犠牲層を導電性層と置換するステップ
をさらに含む、請求項8に記載の3Dメモリデバイスの製造方法。 - 前記トラッピング層の前記下側部分の材料組成は、前記トラッピング層の前記上側部分の材料組成とは異なっている、請求項1に記載の3Dメモリデバイスの製造方法。
- 前記トラッピング層の前記下側部分の一部は、前記トラッピング層の前記下側部分の前記厚さを低減させるために除去される、請求項1に記載の3Dメモリデバイスの製造方法。
- 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、
前記基板の厚さ方向に前記交互の導電性/誘電体スタックを貫通する開口部と、
前記開口部の中に配設されており、前記開口部の側壁部の上に配設されているブロッキング層と、
前記開口部の中に配設されており、前記ブロッキング層の上に配設されているトラッピング層であって、前記トラッピング層は、
下側部分、および、
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
を含む、トラッピング層と
を含む、3次元(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13に記載の3Dメモリデバイス。
- 前記トラッピング層の前記下側部分は、前記基板の前記厚さ方向に前記トラッピング層の前記上側部分と前記基板との間に配設されている、請求項13に記載の3Dメモリデバイス。
- 前記水平方向は、前記基板の前記厚さ方向に直交している、請求項13に記載の3Dメモリデバイス。
- 前記開口部の上部幅は、前記開口部の底部幅よりも大きい、請求項13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13に記載の3Dメモリデバイス。
- 前記開口部の中に配設されており、前記基板の前記厚さ方向に細長い半導体層であって、前記半導体層は、前記水平方向に前記トラッピング層によって取り囲まれている、半導体層と、
前記半導体層と前記トラッピング層との間に配設されているトンネリング層と
をさらに含む、請求項13に記載の3Dメモリデバイス。 - 前記トラッピング層の前記下側部分の材料組成は、前記トラッピング層の前記上側部分の材料組成とは異なっている、請求項13に記載の3Dメモリデバイス。
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