JP2015512567A - ロジックcmosフローへのono統合の方法 - Google Patents
ロジックcmosフローへのono統合の方法 Download PDFInfo
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Abstract
Description
本願は、2011年12月6日に出願された同時係属中の米国特許出願第13/312,964号の一部継続出願であり、これ自体は2009年10月29日に出願された仮出願ではない米国特許出願第12/608,886号(現米国特許第8,071,453号、発行日:2011年12月6日)の継続出願であり、これ自体は2009年6月1日に出願された米国仮特許出願第61/183,021号及び2009年4月24日に出願された米国仮特許出願第61/172,324号についての35 U.S.C. 119(e)による優先権の利益を主張するものであり、これらは全て参照によって本願に組み込まれる。
別の観点においては、本願の開示はマルチゲート又はマルチゲート−表面メモリ装置に関係しており、基板の表面の上又は上方に形成されたチャネルの2以上の面上にある電荷トラッピング領域及びこれをファブリケートする方法が含まれる。マルチゲート装置には、平面型及び非平面型の装置の両者が含まれる。平面マルチゲート装置(不図示)は、一般的にダブルゲート平面型装置を含み、これにおいては、幾つかの第1の層が堆積されて後に形成されるチャネルの下に第1のゲートが形成され、また、その上に幾つかの第2の層が堆積されて第2のゲートが形成される。非平面マルチゲート装置は、一般的に、基板の表面の上又は上方に形成されておりかつ3つ以上の側面においてゲートによって囲まれている水平又は垂直チャネルを含む。
Claims (20)
- MOS装置のパッド誘電体層を基板の第1の領域の上に形成するステップと、
表面の上の半導体物質の薄膜から不揮発性メモリ装置のチャネルを前記基板の第2の領域の上に形成するステップであって、前記チャネルは前記メモリ装置のソースとドレインを接続する、ステップと、
前記チャネルの上の不揮発性メモリ装置のパターン化誘電体スタックを前記第2の領域の上に形成するステップであって、前記パターン化誘電体スタックはトンネル層と電荷トラッピング層と犠牲的な最上層とを備える、ステップと、
前記基板の前記第2の領域から前記犠牲的な最上層を、また、前記基板の前記第1の領域から前記パッド誘電体層を、同時的に除去するステップと、
前記基板の前記第1の領域の上にゲート誘電体層を、また、前記電荷トラッピング層の上にブロッキング誘電体層を、同時的に形成するステップ
とを備える、方法。 - 前記電荷トラッピング層は、トンネル酸化物寄りの窒化物を備える下側電荷トラッピング層と、前記下側電荷トラッピング層に比して相対的に酸素リーンで且つ複数の電荷トラッピング層に分布している電荷トラップの多数を備える上側電荷トラッピング層とを含む、複数の電荷トラッピング層を備える、請求項1に記載の方法。
- 前記ゲート誘電体層は、高誘電率ゲート誘電体を備える、請求項2に記載の方法。
- 前記高誘電率ゲート誘電体の上にメタルゲート層を形成するステップをさらに備える、請求項3に記載の方法。
- 前記電荷トラッピング層は、前記上側電荷トラッピング層と前記下側電荷トラッピング層とを分離する中間酸化物層をさらに備え、前記ゲート誘電体層は高誘電率ゲート誘電体を備える、請求項3に記載の方法。
- 前記高誘電率ゲート誘電体の上にメタルゲート層を形成するステップをさらに備える、請求項5に記載の方法。
- 前記チャネルを形成するステップは、前記チャネルの長軸方向との関係で<100>の表面結晶方位を有するシリコンから前記チャネルを形成するステップを備える、請求項1に記載の方法。
- 前記チャネルの上の不揮発性メモリ装置のパターン化誘電体スタックを形成するステップは、前記パターン化誘電体スタックを前記チャネルの複数の面の上に形成するステップを備える、請求項1に記載の方法。
- 基板の表面の上に、少なくとも1つの誘電体層によって分離された少なくとも2つのゲート層を含むゲート層のスタックを形成するステップと、
前記ゲート層のスタックの第1の領域内に不揮発性メモリ装置を形成するステップであって、該ステップは:
前記ゲート層のスタックの最上面から前記ゲート層のスタックの下面へ延長している第1の開口部を形成するステップと、
前記第1の開口部の側壁に電荷トラッピング層を形成するステップと、
前記電荷トラッピング層の内側側壁に半導体物質の薄層を形成して、及び、前記半導体物質の薄層と前記電荷トラッピング層とで前記ゲート層のスタックから分離された誘電体物質で前記第1の開口部を実質的に充填するステップ
と備える、ステップと、
前記ゲート層のスタックの第2の領域内にMOS装置を形成するステップ
とを備える、方法。 - 前記MOS装置を形成するステップは、
前記ゲート層のスタックの最上面から前記ゲート層のスタックの下面へ延長している第2の開口部を形成するステップと、
前記第2の開口部の側壁にゲート誘電体を形成するステップと、
前記ゲート誘電体の内側側壁に半導体物質の薄層を形成して、及び、前記半導体物質の薄層と前記ゲート誘電体とで前記ゲート層のスタックから分離された誘電体物質で前記第1の開口部を実質的に充填するステップ
とを備える、請求項9に記載の方法。 - 前記電荷トラッピング層は、トンネル酸化物寄りの窒化物を備える下側電荷トラッピング層と、前記下側電荷トラッピング層に比して相対的に酸素リーンで且つ複数の電荷トラッピング層に分布している電荷トラップの多数を備える上側電荷トラッピング層とを含む、複数の電荷トラッピング層を備える、請求項10に記載の方法。
- 前記複数の電荷トラッピング層のジャンクションをアニーリングするステップをさらに備える、請求項11に記載の方法。
- 前記ゲート誘電体は、高誘電率ゲート誘電体を備える、請求項11に記載の方法。
- 前記ゲート層は、メタルゲート層を備える、請求項13に記載の方法。
- 前記電荷トラッピング層は、前記上側電荷トラッピング層と前記下側電荷トラッピング層とを分離する中間酸化物層をさらに備える、請求項14に記載の方法。
- 前記複数の電荷トラッピング層のジャンクションをアニーリングするステップをさらに備える、請求項15に記載の方法。
- 前記電荷トラッピング層は、前記上側電荷トラッピング層と前記下側電荷トラッピング層とを分離する中間酸化物層をさらに備える、請求項14に記載の方法。
- 基板の表面の上に、少なくとも1つの犠牲層によって分離された少なくとも2つの誘電体層を含む誘電体層のスタックを形成するステップと、
前記誘電体層のスタックの第1の領域内に不揮発性メモリ装置を形成するステップであって、該ステップは:
前記誘電体層のスタックの最上面から前記誘電体層のスタックの下面へ延長している第1の開口部と第2の開口部とを前記誘電体層のスタック内に形成するステップと、
前記第1の開口部の側壁に半導体物質の薄層を形成するステップと、
前記第2の開口部の側壁に電荷トラッピング層を形成して、及び、前記電荷トラッピング層の内側側壁に導電物質のゲート層を形成するステップ
と備える、ステップと、
前記誘電体層のスタックの第2の領域内にMOS装置を形成するステップ
とを備える方法。 - 前記MOS装置を形成するステップは、
前記誘電体層のスタックの最上面から前記誘電体層のスタックの下面へ延長している第3の開口部と第4の開口部とを前記誘電体層のスタック内に形成するステップと、
前記第3の開口部の側壁に半導体物質の薄層を形成するステップと、
前記第4の開口部の側壁にゲート誘電体を形成して、及び、前記ゲート誘電体の内側側壁に導電物質のゲート層を形成するステップ
とを備える、請求項18に記載の方法。 - 前記電荷トラッピング層は、トンネル酸化物寄りの窒化物を備える下側電荷トラッピング層と前記下側電荷トラッピング層に比して相対的に酸素リーンで且つ複数の電荷トラッピング層に分布している電荷トラップの多数を備える上側電荷トラッピング層とを含む、複数の電荷トラッピング層を備える、請求項19に記載の方法。
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