JP6265347B2 - ナノワイヤ・アクセス・トランジスタを有するdramを含む半導体構造体及びその形成方法 - Google Patents
ナノワイヤ・アクセス・トランジスタを有するdramを含む半導体構造体及びその形成方法 Download PDFInfo
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Description
10:下部半導体層
12:埋込みプレート
14:ノード誘電体
16:内側電極
18:導電性キャップ構造体
20:埋込み絶縁体層
30、30N:半導体ナノワイヤ
30D:パッド部分
30E1:半導体ナノワイヤの第1の端面
30E2:半導体ナノワイヤの第2の端面
30L:上部半導体層
30P:パターン付けされた半導体材料部分
30W:ラップアラウンド半導体部分
32:ゲート誘電体
32L:ゲート誘電体層
32DE:ドレイン拡張領域
32SE:ソース拡張領域
33:導電性キャップに接触する半導体材料部分
34:誘電体キャップ構造体
36:ゲート電極
37、57:フォトレジスト層
38:誘電体ゲート・キャップ
52:第1のゲート・スペーサ
54:第2のゲート・スペーサ
62:ソース領域
64:ドレイン領域
72:ソース側金属半導体合金部分
74:ドレイン側金属半導体合金部分
80:コンタクト・レベル誘電体層
88:ドレイン・コンタクト・ビア構造体
C:パッド部分の中央部分
Claims (25)
- 基板(8)内に埋め込まれ、内側電極(16)、ノード誘電体(14)、及び外側電極(12)を含むトレンチ・キャパシタ(12、14、16)と、
前記内側電極に接触してその上に重なる導電性キャップ構造体(18)と、
前記基板内の絶縁体層(20)の上に重なる半導体ナノワイヤ(30N)と、
前記半導体ナノワイヤの一方の端部に接触するソース領域(62)と、
前記ソース領域に接触するソース側金属半導体合金部分(72)と、を含み、
前記ソース側金属半導体合金部分は、前記ソース領域の下側に在って前記導電性キャップ構造体に接触する部分を含み、
前記半導体ナノワイヤが、前記絶縁体層の平坦な上面から垂直方向に離間し、前記半導体ナノワイヤの長手方向が前記絶縁体層の前記平坦な上面と平行であり、
前記絶縁体層の前記平坦な上面が、前記導電性キャップ構造体に隣接した前記絶縁体層の湾曲した上面に隣接する、半導体構造体。 - 前記半導体ナノワイヤの中央部分を囲み、前記半導体ナノワイヤからゲート誘電体によって離間したラップアラウンド・ゲート電極部分(36)をさらに含む、請求項1に記載の半導体構造体。
- 前記ラップアラウンド・ゲート電極部分の全ての側壁に横方向に接触する少なくとも1つのゲート・スペーサをさらに含む、請求項2に記載の半導体構造体。
- 前記少なくとも1つのゲート・スペーサ(52)が前記絶縁体層の平坦な上面に接触する、請求項3記載の半導体構造体。
- 前記半導体ナノワイヤの長手方向に直角の前記半導体ナノワイヤの端面が、前記少なくとも1つのゲート・スペーサの外表面の垂直部分と垂直方向で一致する、請求項3に記載の半導体構造体。
- 前記半導体ナノワイヤの一方の端部内に位置し、前記ソース領域に接触するソース拡張領域をさらに含む、請求項1に記載の半導体構造体。
- 前記ソース領域の垂直面が、前記ソース領域と前記半導体ナノワイヤの界面の平面内の前記半導体ナノワイヤの垂直面と接触し、前記ソース領域の前記垂直面は、前記半導体ナノワイヤの前記垂直面より大きい面積を有する、請求項1に記載の半導体構造体。
- 前記半導体ナノワイヤの他方の端部に接触するドレイン領域(64)をさらに含む、請求項1に記載の半導体構造体。
- 前記ソース領域が、前記半導体ナノワイヤの最下面の下まで延び、かつ、前記半導体ナノワイヤの長手方向に直角の水平方向において前記半導体ナノワイヤの最外側面よりも遠くまで横方向に延びる、請求項1に記載の半導体構造体。
- 前記トレンチ・キャパシタの上に重なり、前記トレンチ・キャパシタから電気的に絶縁された通過ゲート電極部分をさらに含む、請求項1に記載の半導体構造体。
- 前記通過ゲート電極部分の一部分の下にあり、前記導電性キャップ構造体に横方向に接触する少なくとも1つの半導体材料部分をさらに含む、請求項10に記載の半導体構造体。
- 前記少なくとも1つの半導体材料部分の各々が、前記ラップアラウンド・ゲート電極部分によって囲まれた前記半導体ナノワイヤ内の本体領域と同じ組成及び厚さを有する、請求項11に記載の半導体構造体。
- 前記ソース側金属半導体合金部分は、前記ソース領域を囲んでいる、請求項1に記載の半導体構造体。
- 前記ソース領域の最上部は、前記半導体ナノワイヤの最上面を含む水平面よりも上まで延び、前記ソース領域の最下部は、前記半導体ナノワイヤの最下面を含む水平面よりも下まで延びる、請求項1に記載の半導体構造体。
- 半導体構造体を形成する方法であって、
内側電極(16)、ノード誘電体(14)、及び外側電極(12)を含むトレンチ・キャパシタ(12、14、16)を、ハンドル基板、埋込み絶縁体層(20)、及び上部半導体層を含むセミコンダクタ・オン・インシュレータ基板(8)内に形成することと、
導電性キャップ構造体を前記内側電極の上に形成することと、
半導体ナノワイヤ(30N)と、前記導電性キャップ構造体(18)に横方向に接触するラップアラウンド半導体部分(30W)とを含むパターン付けされた半導体材料部分(30P)を、前記上部半導体層の部分から形成することと、
前記ラップアラウンド半導体部分(30W)に隣接した前記半導体ナノワイヤの部分を除去して、前記半導体ナノワイヤの端面を物理的に露出させることと、
少なくとも1つの導電性材料を堆積させることによって、前記物理的に露出した端面と前記導電性キャップ構造体との間に導電経路を形成することと、を含む方法。 - 前記埋込み絶縁体層の上部を前記半導体ナノワイヤの下から除去することをさらに含む、請求項15に記載の方法。
- 前記半導体ナノワイヤの長手方向の回りに、前記半導体ナノワイヤを連続的に囲むゲート誘電体層を形成することをさらに含み、前記ゲート誘電体層の下部は、前記埋込み絶縁体層の平坦な上面の上に重なり、かつ、そこから垂直方向に離間する、請求項16に記載の方法。
- 前記パターン付けされた半導体材料構造体は、前記ラップアラウンド半導体部分に隣接したパッド部分をさらに含み、前記埋込み絶縁体層は、前記埋込み絶縁体層の前記上部の前記除去後、前記パッド部分の中央部分に接触している、請求項16に記載の方法。
- 前記ラップアラウンド半導体部分及び前記パッド部分は、前記導電性キャップ構造体を横方向で囲み、その側壁に接触する、請求項18に記載の方法。
- 前記物理的に露出した端面上に半導体材料を堆積させることによってソース領域を形成することをさらに含み、前記ソース領域が前記導電経路の一部分となる、請求項15に記載の方法。
- 前記半導体ナノワイヤの別の部分を除去して、前記半導体ナノワイヤの別の端面を物理的に露出させることと、
前記別の物理的に露出した端面上に前記半導体材料を堆積させることによってドレイン領域を形成することと、
をさらに含む、請求項20に記載の方法。 - 前記半導体材料は、選択的エピタキシによって堆積され、前記半導体ナノワイヤ内の単結晶半導体材料とエピタキシャルに整合する、請求項20に記載の方法。
- 金属を前記半導体材料と反応させることにより前記ソース領域上に金属半導体合金部分を形成することをさらに含み、前記金属半導体合金部分が、前記導電性キャップ構造体に接触する、請求項20に記載の方法。
- 前記半導体ナノワイヤの回りにゲート誘電体層を形成することと、
前記半導体ナノワイヤの回りにラップアラウンド・ゲート電極を形成することと、
をさらに含み、
前記ラップアラウンド・ゲート電極が、前記半導体ナノワイヤの長手方向の回りに前記半導体ナノワイヤを連続的に囲む、請求項20に記載の方法。 - 前記ラップアラウンド・ゲート電極部分の側壁上に少なくとも1つのゲート・スペーサを形成することと、
異方性エッチングを用いて、前記半導体ナノワイヤの、前記ラップアラウンド・ゲート電極又は前記少なくとも1つのゲート・スペーサの下にない部分をエッチングすることと、をさらに含み、
前記半導体ナノワイヤの前記部分が前記異方性エッチングによってエッチングされる、請求項24に記載の方法。
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