JP2023553124A - 半導体構造及びその製造方法 - Google Patents
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Abstract
Description
本願は、2021年07月16日に提出された、出願番号が202110808697.5であり、発明の名称が「半導体構造及びその製造方法」である中国特許出願を引用し、その内容の全てが引用により本願に組み込まれる。
半導体元素がシリコンであることを例として、金属半導体化合物114は、ケイ化コバルト、ケイ化ニッケル、ケイ化モリブデン、ケイ化チタン、ケイ化タングステン、ケイ化タンタル、又はケイ化プラチナのうちの少なくとも1つを含む。
他の実施例において、初期過渡層をマスクとして、第2隔離層、第3隔離層、及び第4隔離層をエッチングし、それによって、初期ビット線及び第2ドーピング領域の側壁を露出させる。次に、露出された第2ドーピング領域の側壁に対して熱酸化処理を行い、それによって、第2誘電体層を形成する。
Claims (20)
- 半導体構造であって、
ベースと、
前記ベースに位置するビット線と、
前記ビット線の表面に位置する半導体チャネルを含み、
前記ベースから前記ビット線に指す方向に沿って、前記半導体チャネルは、順に配置された第1ドーピング領域、チャネル領域、及び第2ドーピング領域を含み、前記第1ドーピング領域は、前記ビット線に接触し、前記第1ドーピング領域、前記チャネル領域、及び前記第2ドーピング領域に、第1種類ドーピングイオンがドーピングされ、前記チャネル領域にさらに、第2種類ドーピングイオンがドーピングされ、それによって、前記チャネル領域における多数キャリアの濃度を、前記第1ドーピング領域と前記第2ドーピング領域における多数キャリアの濃度より低くし、前記第1種類ドーピングイオンは、N型イオンとP型イオンのうちの一方であり、前記第2種類ドーピングイオンは、N型イオンとP型イオンのうちの他方である、半導体構造。 - 前記第2種類ドーピングイオンはさらに、前記第1ドーピング領域の前記チャネル領域、及び前記第2ドーピング領域の前記チャネル領域に近い領域に位置する、
請求項1に記載の半導体構造。 - 前記第1種類ドーピングイオンの前記チャネル領域における有効ドーピング濃度は、前記第1種類ドーピングイオンの前記第1ドーピング領域における有効ドーピング濃度より低く、前記第1種類ドーピングイオンの前記チャネル領域における有効ドーピング濃度は、第1種類ドーピングイオンの前記第2ドーピング領域における有効ドーピング濃度より低い、
請求項1に記載の半導体構造。 - 前記チャネル領域における前記第1種類ドーピングイオンの有効ドーピング濃度は、8×1018atom/cm3~2×1019atom/cm3である、
請求項3に記載の半導体構造。 - 前記第1ドーピング領域における前記第1種類ドーピングイオンの有効ドーピング濃度は、3×1019atom/cm3~1×1020atom/cm3であり、前記第2ドーピング領域における前記第1種類ドーピングイオンの有効ドーピング濃度は、3×1019atom/cm3~1×1020atom/cm3である、
請求項3に記載の半導体構造。 - 前記ベースへの前記チャネル領域の正投影は、前記ベースへの前記第2ドーピング領域の正投影より小さく、且つ、前記ベースへの前記第1ドーピング領域の正投影より小さい、
請求項1に記載の半導体構造。 - 前記ベース、前記ビット線、及び前記半導体チャネルは、同じ半導体元素を有する、
請求項1に記載の半導体構造。 - 前記ビット線の材料はさらに、金属半導体化合物を含む、
請求項7に記載の半導体構造。 - 前記半導体構造はさらに、
前記第2ドーピング領域の前記ベースから離れる上面に位置する金属接触層を含み、前記金属半導体化合物と前記金属接触層は、同じ金属元素を有する、
請求項8に記載の半導体構造。 - 前記半導体構造はさらに、
前記チャネル領域の側壁の表面を覆う絶縁層と、
前記絶縁層の前記チャネル領域から離れる側壁の表面を覆うワード線であって、隣接する前記第1ドーピング領域の側壁、隣接する前記ワード線の側壁、及び隣接する前記第2ドーピング領域の側壁によって隙間を構成する、ワード線と、
前記隙間に位置する隔離層であって、前記隔離層の前記ベースから離れる上面は、前記第2ドーピング領域の前記ベースから離れる上面より低くない、隔離層と、を含む、
請求項1に記載の半導体構造。 - 半導体構造の製造方法であって、
ベースを提供するステップと、
前記ベースに初期ビット線を形成し、前記初期ビット線の前記ベースから離れる表面に半導体チャネルを形成するステップであって、前記ベースから前記初期ビット線に指す方向に沿って、前記半導体チャネルは、順に配置された第1ドーピング領域、チャネル領域、及び第2ドーピング領域を含み、前記第1ドーピング領域、前記チャネル領域、及び前記第2ドーピング領域には、同じドーピング濃度の第1種類ドーピングイオンがドーピングされ、前記第1種類ドーピングイオンは、N型イオンとP型イオンのうちの一方である、ステップと、
前記チャネル領域の側壁に第2種類ドーピングイオンがドーピングされた犠牲層を形成するステップであって、前記犠牲層は、少なくとも前記チャネル領域の側壁を覆い、前記第2種類ドーピングイオンは、N型イオンとP型イオンのうちの他方である、ステップと、
アニールプロセスを採用して、前記第2種類ドーピングイオンを前記チャネル領域に拡散させ、それによって、前記チャネル領域における多数キャリアの濃度を低減させるステップと、
前記犠牲層を除去することによって、前記チャネル領域の側壁を露出させるステップと、を含む、半導体構造の製造方法。 - 前記犠牲層における前記第2種類ドーピングイオンのドーピング濃度は、4×1020atom/cm3~9×1020atom/cm3である、
請求項11に記載の半導体構造の製造方法。 - 前記チャネル領域の側壁に第2種類ドーピングイオンがドーピングされた犠牲層を形成する前に、前記半導体構造の製造方法はさらに、
前記チャネル領域の側壁の表面に保護層を形成するステップを含み、前記保護層は、前記チャネル領域の側壁の表面を覆い、
前記犠牲層を除去した後に、前記半導体構造の製造方法はさらに、前記保護層を除去するステップを含む、
請求項11に記載の半導体構造の製造方法。 - 前記犠牲層が隣接する前記保護層の間隔に充填され、隣接する前記第2ドーピング領域の間隔に位置する、
請求項13に記載の半導体構造の製造方法。 - 前記アニールプロセスのステップにおいて、前記第2種類ドーピングイオンの拡散方向は、前記チャネル領域から前記第1ドーピング領域に指す方向、又は、前記チャネル領域から前記第2ドーピング領域に指す方向である、
請求項11に記載の半導体構造の製造方法。 - 前記チャネル領域の側壁に第2種類ドーピングイオンがドーピングされた犠牲層を形成する前に、前記半導体構造の製造方法はさらに、
前記第1ドーピング領域の側壁の表面を覆う第1隔離層を形成するステップであって、同一の前記初期ビット線における隣接する前記第1ドーピング領域の側壁の前記第1隔離層の間は、第1間隔を有し、前記第1間隔から前記初期ビット線が露出される、ステップと、
第2隔離層を形成するステップであって、前記第2隔離層は、前記第1間隔に位置し、前記第2隔離層の前記ベースから離れる上面は、前記第2ドーピング領域の前記ベースから離れる上面より低くなく、前記第2隔離層と前記チャネル領域との間は、第2間隔を有する、ステップと、
前記第2ドーピング領域の側壁の表面を覆う第3隔離層を形成するステップであって、前記第3隔離層は、前記第2隔離層に接触し、隣接する前記初期ビット線に位置する隣接する前記第2ドーピング領域の側壁の前記第2隔離層の間は、第3間隔を有し、前記第2間隔と前記第3間隔は、接続されている、ステップと、を含む、
請求項11に記載の半導体構造の製造方法。 - 前記犠牲層を除去した後に、前記半導体構造の製造方法はさらに、
前記チャネル領域の側壁の表面を覆う絶縁層を形成するステップと、
前記絶縁層の前記チャネル領域から離れる側壁の表面を覆うワード線を形成するステップであって、前記ワード線と前記絶縁層によって、前記第2間隔が満杯にされる、ステップと、を含む、
請求項16に記載の半導体構造の製造方法。 - 前記ワード線を形成した後に、前記半導体構造の製造方法はさらに、
前記第2隔離層と前記第3隔離層を除去し、それによって、前記初期ビット線を露出させるステップと、
露出された前記初期ビット線に対して金属化処理を行い、それによって、ビット線を形成するステップであって、前記ビット線の材料は、金属半導体化合物を含む、ステップと、を含む、
請求項17に記載の半導体構造の製造方法。 - 前記ワード線を形成した後に、前記第2隔離層と前記第3隔離層を除去する前に、前記半導体構造の製造方法はさらに、
エピタキシャル成長プロセスを採用して、前記第2ドーピング領域の前記ベースから離れる上面に初期過渡層を形成するステップを含み、前記初期過渡層には、前記第1種類ドーピングイオンがドーピングされ、前記第1種類ドーピングイオンの前記初期過渡層におけるドーピング濃度は、前記第1種類ドーピングイオンの前記第2ドーピング領域における有効ドーピング濃度より大きく、前記ベースへの前記初期過渡層の正投影は、前記ベースへの前記第2ドーピング領域の正投影を覆う、
請求項18に記載の半導体構造の製造方法。 - 前記初期ビット線に対して前記金属化処理を行うステップは、さらに、前記初期過渡層に対して金属化処理を行うステップを含む、
請求項19に記載の半導体構造の製造方法。
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US12015081B2 (en) * | 2021-07-15 | 2024-06-18 | Taiwan Semiconductor Manufacturing Company, Ltd. | Semiconductor device and manufacturing method thereof |
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