JP7049316B2 - 三次元半導体デバイス及び製造方法 - Google Patents
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Description
この出願は、2016年8月8日出願の米国仮特許出願第62/372,106号明細書に基づき、その優先権の利益を主張するものであって、その内容の全てを引用して本明細書に組み込む。
一時的充填材料430は、次いで、所望の点まで、等方的に凹部が作成される。検討する3D SRAM設計例に対して、制御及びパスゲート間のアイソレーションが共通ゲート領域内部で必要とされる。凹部は、SiO(SiOが一時的ゲート充填材料として用いられた場合)及びシリコンワイヤ並びにゲートスペーサ材料の間に100:1を超える選択性を有する東京エレクトロンCERTASプロセスを介して行われてもよい。かかる気相エッチングは本質的に周期性であるため、エッチングは横方向ナノワイヤの間の正確な距離で停止することができる。
Claims (20)
- 半導体デバイスであって、
基板と、
前記基板上に形成される電界効果トランジスタのゲート領域であって、前記ゲート領域は前記基板の作業面と平行に延在する長手方向軸を有する垂直方向に積層されるナノワイヤを含み、垂直方向に積層されるナノワイヤの所定のスタックは垂直方向に整列される少なくとも2つのナノワイヤを含み、p型ナノワイヤ及びn型ナノワイヤは垂直方向で互いから空間的に分離される、ゲート領域と、
各ナノワイヤを前記ゲート領域より上の位置へ電気的に接続する前記ゲート領域内部に形成される段差付接続構造であって、第1のゲート電極は段差付プロフィルを有し、第1レベルのナノワイヤへ接続する、段差付接続構造を備える、半導体デバイス。 - 前記半導体デバイスは垂直方向に整列される前記少なくとも2つのナノワイヤの間に位置決めされるバリア層を含む、請求項1に記載の半導体デバイス。
- 前記バリア層は、下部ナノワイヤを覆い、前記下部ナノワイヤと前記下部ナノワイヤの上で垂直方向に整列される上部ナノワイヤとの間に延在する一時的表面上に、前記バリア層が前記上部ナノワイヤ上に堆積されておらず、選択的に堆積されている、請求項2に記載の半導体デバイス。
- 前記ゲート領域の上の各ゲート電極のための電気的接点は互いと隣接する、請求項1に記載の半導体デバイス。
- 前記段差付接続構造は、前記第1のゲート電極の水平セグメントの上に位置決めされ、第2レベルのナノワイヤへ接続される第2のゲート電極を含む、請求項1に記載の半導体デバイス。
- 前記段差付接続構造は第2レベルのナノワイヤへ接続する第2のゲート電極を含み、前記第2レベルのナノワイヤは前記第1レベルのナノワイヤの上に位置決めされ、前記第2のゲート電極は前記第1のゲート電極の水平面の上に位置決めされ、前記第1のゲート電極及び前記第2のゲート電極は1つ以上の誘電体膜によって分離される、請求項1に記載の半導体デバイス。
- 各ナノワイヤは互いから空間的及び電気的に分離される、請求項1に記載の半導体デバイス。
- 前記第1のゲート電極は水平方向に延在する部材及び垂直方向に延在する部材を有し、
前記段差付接続構造は前記水平方向に延在する部材の上に位置決めされ、前記垂直方向に延在する部材に隣接する第2のゲート電極を含み、前記第1のゲート電極が前記第2のゲート電極から電気的に分離される、請求項1に記載の半導体デバイス。 - 前記p型ナノワイヤはn-チャネル金属酸化物半導体(NMOS)電界効果トランジスタであり、
前記n型ナノワイヤはp-チャネル金属酸化物半導体(PMOS)電界効果トランジスタである、請求項1に記載の半導体デバイス。 - 前記n型ナノワイヤは第1のナノワイヤレベルに位置決めされ、
p型ナノワイヤは前記第1のナノワイヤレベルより上の第2のナノワイヤレベルに位置決めされる、請求項9に記載の半導体デバイス。 - 少なくとも1つのナノワイヤレベルは同じ半導体チャネル型の2つの垂直方向に積層されるナノワイヤを含む、請求項1に記載の半導体デバイス。
- 前記半導体デバイスはSRAMデバイスである、請求項1に記載の半導体デバイス。
- 前記半導体デバイスはプログラマブル論理デバイスである、請求項1に記載の半導体デバイス。
- 前記半導体デバイスはランダム論理デバイスである、請求項1に記載の半導体デバイス。
- 前記半導体デバイスはランダム論理セルの上に位置決めされるSRAMセルを有する組み合わせデバイスである、請求項1に記載の半導体デバイス。
- 半導体デバイスを形成する方法であって、
電界効果トランジスタデバイスのゲート領域を通って延在するナノワイヤを形成することと、
前記ゲート領域内部の2つの垂直方向に分離されるナノワイヤの間に水平バリア層を形成することであって、前記ゲート領域は第1レベルのナノワイヤを覆う一時的充填材料を有し、前記一時的充填材料は前記第1レベルのナノワイヤと第2レベルのナノワイヤとの間に延在する水平面を有し、前記第2レベルのナノワイヤは前記第1レベルのナノワイヤより上に位置決めされ、前記第1レベルのナノワイヤと垂直方向に整列され、前記水平バリア層は、前記第2レベルのナノワイヤ上にバリア材料を堆積させることなく、前記一時的充填材料の一時的表面上にバリア材料を選択的に堆積させることによって形成される、ことと、
前記水平バリア層へ延在する垂直電極バリアを形成することと、
前記ゲート領域内部に第1のゲート電極及び第2のゲート電極を形成することであって、各ゲート電極はナノワイヤを前記ゲート領域より上の接点位置へ電気的に接続し、前記第1のゲート電極は段差付プロフィルを有し、前記第1及び第2のゲート電極は少なくとも前記水平バリア層及び前記垂直電極バリアによって互いから分離される、ことと、を含む、方法。 - 前記ナノワイヤを形成することは、n型ナノワイヤを対応するp型ナノワイヤより垂直方向で上に形成することを含む、請求項16に記載の方法。
- 前記ナノワイヤを形成することは、p型ナノワイヤを対応するn型ナノワイヤより垂直方向で上に形成することを含む、請求項16に記載の方法。
- ナノワイヤを形成することは、第1の材料及び第2の材料の交互の層を有するフィンを形成することと、
前記第2の材料がナノワイヤとして残るように、前記第1の材料を選択的に除去することと、を含む、請求項16に記載の方法。 - 半導体デバイスを形成する方法であって、
長手方向軸が水平に配向され、ナノワイヤが互いから離間され、垂直方向に整列されて、少なくとも2つのナノワイヤを含むナノワイヤの垂直スタックを有するゲート領域を形成することと、
前記ゲート領域において一時的充填材料を堆積させるプロセスシーケンスを実行することと、
垂直方向に積層されるナノワイヤ同士の間の位置に対して前記一時的充填材料に凹部を形成することと、
覆われていないナノワイヤ上に堆積させることなく、前記一時的充填材料上に選択的に堆積させることによって水平バリアを形成することと、
垂直バリアを形成することと、
ナノワイヤを選択的に金属化することと、
前記水平バリア及び垂直バリアによって画成される空間内に金属堆積させることによって第1及び第2のゲート電極を形成することと、を含む、方法。
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