JP2014138161A - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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Abstract
【解決手段】支持基板Sと、支持基板S上に形成された絶縁層BOXと、絶縁層BOX上に形成されたシリコン層SRとを有するSOI基板SUBに形成されたnチャネル型MISFET(NT)を有する半導体装置を次の構成とする。ゲート電極GEの支持基板S中に閾値調整用の不純物領域VTCR(p)を設け、シリコン層SR中に炭素を含有するように構成する。このように、閾値調整用の半導体領域VTCR(p)により閾値を調整することができる。さらに、炭素を含有するシリコン層SR(C)を設けることで、絶縁層BOXを超えて、シリコン層SRにまで閾値調整用の半導体領域VTCR(p)の不純物が拡散しても、シリコン層SR中に注入された炭素(C)により不活性化される。これにより、MISFETの閾値電圧のばらつきなど、トランジスタ特性のばらつきを低減することができる。
【選択図】図1
Description
[構造説明]
以下、図面を参照しながら本実施の形態の半導体装置について詳細に説明する。図1は、本実施の形態の半導体装置の特徴的な構成を示す断面図である。
次いで、図面を参照しながら、本実施の形態の半導体装置の製造方法を説明するとともに、当該半導体装置の構成を明確にする。図3〜図15は、本実施の形態の半導体装置の製造工程を示す断面図である。
[構造説明]
以下、図面を参照しながら本実施の形態の半導体装置について詳細に説明する。図20は、本実施の形態の半導体装置の特徴的な構成を示す断面図である。
次いで、図面を参照しながら、本実施の形態の半導体装置の製造方法を説明するとともに、当該半導体装置の構成を明確にする。図22〜図29は、本実施の形態の半導体装置の製造工程を示す断面図である。
EP エピタキシャル層
GE ゲート電極
GI ゲート絶縁膜
IF 絶縁膜
IS 格子間シリコン
NA nMIS形成領域
Niso n型半導体領域
NM 低濃度不純物領域
NP 高濃度不純物領域
NT nチャネル型MISFET
NW n型ウエル領域
PA pMIS形成領域
PM 低濃度不純物領域
PP 高濃度不純物領域
PR1 フォトレジスト膜
PR2 フォトレジスト膜
PT pチャネル型MISFET
PW p型ウエル領域
S 支持基板
SF 多結晶シリコン膜
SIL 金属シリサイド層
SOX 酸化シリコン膜
SR シリコン層
SR(C) 炭素を含有するシリコン層
STI 素子分離絶縁膜
SUB SOI基板
SW サイドウォール膜
VTCR 不純物領域
VTCR(n) 不純物領域
VTCR(p) 不純物領域
Claims (20)
- 半導体基板と、前記半導体基板上に形成された絶縁層と、前記絶縁層上に形成され、炭素を含有する半導体層とを有する基板と、
前記半導体層上にゲート絶縁膜を介して形成されたゲート電極と、前記ゲート電極の両側の前記半導体層中に形成されたソース・ドレイン領域と、を有する電界効果トランジスタと、
前記ゲート電極の下部において、前記半導体層および前記絶縁層を介して前記半導体基板中に配置された半導体領域と、
を有する半導体装置。 - 請求項1記載の半導体装置において、
前記ソース・ドレイン領域は前記半導体層上に形成されたエピタキシャル層を含む、半導体装置。 - 請求項1記載の半導体装置において、
前記ソース・ドレイン領域は、n型の半導体領域である、半導体装置。 - 請求項1記載の半導体装置において、
前記ソース・ドレイン領域は、p型の半導体領域である、半導体装置。 - (a)半導体基板と、前記半導体基板上に形成された絶縁層と、前記絶縁層上に形成された半導体層とを有する基板を準備する工程と、
(b)前記半導体基板中に、n型不純物またはp型不純物をイオン注入することにより、半導体領域を形成する工程と、
(c)前記半導体層中に、炭素をイオン注入する工程と、
(d)前記(b)および前記(c)工程の後、前記半導体層の主表面に電界効果トランジスタを形成する工程と、
を有する半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記(b)工程の後、前記(c)工程を行う、半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記(c)工程の後、前記(b)工程を行う、半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記(c)工程の後、熱処理を施す工程を有する、半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記電界効果トランジスタは、nチャネル型MISFETである、半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記電界効果トランジスタは、pチャネル型MISFETである、半導体装置の製造方法。 - 半導体基板と、前記半導体基板上に形成された絶縁層と、前記絶縁層上に形成された半導体層とを有し、前記絶縁層下の前記半導体基板に格子間原子を有する基板と、
前記半導体層上にゲート絶縁膜を介して形成されたゲート電極と、前記ゲート電極の両側の半導体層中に形成されたソース・ドレイン領域と、を有する電界効果トランジスタと、
前記ゲート電極の下部において、前記半導体層および前記絶縁層を介して前記半導体基板中に配置された半導体領域と、
を有する半導体装置。 - 請求項11記載の半導体装置において、
前記格子間原子は、前記半導体領域中に存在する、半導体装置。 - 請求項11記載の半導体装置において、
前記ソース・ドレイン領域は前記半導体層上に形成されたエピタキシャル層を含む、半導体装置。 - 請求項11記載の半導体装置において、
前記ソース・ドレイン領域は、n型の半導体領域またはp型の半導体領域である、半導体装置。 - 請求項11記載の半導体装置において、
前記格子間原子は、格子間シリコンである、半導体装置。 - (a)半導体基板と、前記半導体基板上に形成された絶縁層と、前記絶縁層上に形成された半導体層とを有する基板を準備する工程と、
(b)前記半導体基板中に、n型不純物またはp型不純物をイオン注入することにより、半導体領域を形成する工程と、
(c)前記絶縁層下の前記半導体基板に、原子をイオン注入することにより、格子間原子を形成する工程と、
(d)前記(b)および前記(c)工程の後、前記半導体層の主表面に電界効果トランジスタを形成する工程と、
を有する半導体装置の製造方法。 - 請求項16記載の半導体装置の製造方法において、
前記(b)工程の後、前記(c)工程を行う、半導体装置の製造方法。 - 請求項16記載の半導体装置の製造方法において、
前記(c)工程の後、前記(b)工程を行う、半導体装置の製造方法。 - 請求項16記載の半導体装置の製造方法において、
前記(c)工程の後、熱処理を施す工程を有する、半導体装置の製造方法。 - 請求項16記載の半導体装置の製造方法において、
前記電界効果トランジスタは、nチャネル型MISFETまたはpチャネル型MISFETである、半導体装置の製造方法。
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