JP2014042005A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP2014042005A JP2014042005A JP2013146063A JP2013146063A JP2014042005A JP 2014042005 A JP2014042005 A JP 2014042005A JP 2013146063 A JP2013146063 A JP 2013146063A JP 2013146063 A JP2013146063 A JP 2013146063A JP 2014042005 A JP2014042005 A JP 2014042005A
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- Prior art keywords
- insulating film
- film
- transistor
- electrode
- nitride insulating
- Prior art date
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- Granted
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Abstract
【解決手段】シリコン半導体を用いたトランジスタ及び酸化物半導体を用いたトランジスタの間に異なる機能を有する2つの窒化絶縁膜を設ける。具体的には、シリコン半導体を用いたトランジスタ上に水素を含む第1の窒化絶縁膜を設けて、第1の窒化絶縁膜と酸化物半導体を用いたトランジスタとの間に、第1の窒化絶縁膜よりも水素含有量が低く、水素に対するバリア膜として機能する第2の窒化絶縁膜を設けることである。
【選択図】図1
Description
本実施の形態では、本発明の一態様である半導体装置について、図面を用いて説明する。
図1(A)に、本発明の一態様である半導体装置の断面図を示す。図1(A)に示す半導体装置は、複数のトランジスタを有する半導体装置であって、集積化度を高めるために複数のトランジスタの一部が縦方向に積層されている。
次に、本発明の一態様である半導体装置及び作製方法について図面を用いて説明する。以下では、はじめに下部のCMOS回路を構成するトランジスタの作製方法について説明し、その後、上部の酸化物半導体を用いたトランジスタの作製方法について説明する。
実施の形態1に示す半導体装置の変形例について、図6を用いて説明する。酸素が拡散しにくい導電膜を用いて電極163、電極165、及び電極167を形成する、又は酸素に対してバリア性を有する酸化物膜(ルテニウム酸化物など)を積層して電極163、電極165、及び電極167を構成することで、第2の窒化絶縁膜113を、層間絶縁膜161と、電極163、電極165、及び電極167との間に設けることができる(図6参照)。
実施の形態1に示す半導体装置の変形例について、図7を用いて説明する。図7に示す半導体装置は、第1の窒化絶縁膜111が第2の窒化絶縁膜113と接する点が図1に示す半導体装置と異なる。
次に、上記半導体装置の変形例の作製方法について、図4乃至図6、図8、及び図9を用いて説明する。
また、本発明の一態様である半導体装置は、半導体装置の変形例2の構成において、第1の窒化絶縁膜111と第2の窒化絶縁膜113との間に、第1の窒化絶縁膜111及び第2の窒化絶縁膜113に接して酸化絶縁膜が設けられた構成であってもよい。当該酸化絶縁膜は、酸化シリコン膜又は酸化窒化シリコン膜とすることができる。
半導体装置の変形例2、変形例3の構造は、図7に示した構成に限定されない。例えば、酸素が拡散しにくい導電膜を用いて電極163、電極165、及び電極167を形成する、又は酸素に対してバリア性を有する酸化物膜(ルテニウム酸化物など)を積層して電極163、電極165、及び電極167を構成することで、第1の窒化絶縁膜111及び第2の窒化絶縁膜113を、層間絶縁膜161と、電極163、電極165、及び電極167との間に設けることができる(図10(A)参照)。または、第1の窒化絶縁膜111と第2の窒化絶縁膜113との間に電極163、電極165、及び電極167が設けられた構成であってもよい(図10(B)参照)。このような構造とすることで、電極163、165、167の酸化を防ぐことが可能であるため、電極163、165、167の抵抗値の上昇を防ぐことができる。
本発明の一態様である半導体装置の他の例として、論理回路であるNOR型回路の断面図の一例を図11(A)に示す。図11(B)は図11(A)に対応するNOR型回路の回路図であり、図11(C)はNAND型回路の回路図である。
本実施の形態に示す半導体装置の変形例を図14に示す。図14(A)に示すNOR型回路図に相当する半導体装置は、pチャネル型トランジスタであるトランジスタ201及びpチャネル型トランジスタであるトランジスタ202と、トランジスタ203及びトランジスタ204との間に、水素を含み、加熱によって水素を放出する第1の窒化絶縁膜211を有し、第1の窒化絶縁膜211に積層され、第1の窒化絶縁膜211よりも低い水素含有量を有し、水素に対するバリア膜として機能する第2の窒化絶縁膜213を有する。
また、本実施の形態では、NOR型回路とNAND型回路の例を示したが、特に限定されず、シリコン半導体を用いたトランジスタ及び酸化物半導体を用いたトランジスタを使用してAND型回路やOR型回路などを形成することができる。例えば、シリコン半導体を用いたトランジスタ及び酸化物半導体を用いたトランジスタを使用して、電力が供給されない状況でもデータの保持が可能で、且つ、書き込み回数にも制限が無い半導体装置(記憶装置)を作製することもできる。
本実施の形態では、先の実施の形態で説明した半導体装置に適用でき、酸化物半導体を用いたトランジスタにおいて、酸化物半導体膜に適用可能な一態様について説明する。
本実施の形態では、本発明の一態様である半導体装置に含まれる酸化物半導体を用いたトランジスタに適用可能な一態様について説明する。
本実施の形態では、本発明の一態様である半導体装置の一例として、先の実施の形態で説明した半導体装置を少なくとも一部に用いたCPU(Central Processing Unit)について説明する。
本実施の形態では、先の実施の形態で説明した半導体装置を搭載した電子機器の例について図20を用いて説明する。先の実施の形態で説明した半導体装置は、スイッチング特性の良い酸化物半導体を用いたトランジスタを有するので、各電子機器の消費電力を低減することができる。また、酸化物半導体の特性を利用した新たな半導体装置(例えば、メモリ素子又はメモリセルなどの記憶装置など)が提供されるため、新たな構成の電子機器を提供することが可能である。なお、先の実施の形態で説明した半導体装置は、単体、または集積化されて回路基板などに実装され、各電子機器の内部に搭載される。
Claims (20)
- 第1のチャネル形成領域を含むシリコン半導体膜を有する、第1のトランジスタと、
前記第1のトランジスタ上に、第1の窒化絶縁膜及び第2の窒化絶縁膜を有する、絶縁膜と、
前記絶縁膜上に、第2のチャネル形成領域を含む酸化物半導体膜を有する、第2のトランジスタと、を有し、
前記第2の窒化絶縁膜は、前記第1の窒化絶縁膜と前記酸化物半導体膜との間に設けられ、
前記第2の窒化絶縁膜の水素濃度は、前記第1の窒化絶縁膜の水素濃度よりも低いことを特徴とする半導体装置。 - 請求項1において、
前記第2の窒化絶縁膜の密度が2.75g/cm3以上であること特徴とする半導体装置。 - 請求項1において、
前記第1の窒化絶縁膜の水素濃度が20原子%以上25原子%以下であることを特徴とする半導体装置。 - 請求項1において、
前記第2の窒化絶縁膜の水素濃度が10原子%以上15原子%以下であることを特徴とする半導体装置。 - 請求項1において、
前記第2の窒化絶縁膜は、20℃以上25℃以下において0.5重量%のフッ酸に対するエッチング速度が2.0nm/分以下であることを特徴とする半導体装置。 - 請求項1において、
前記第2の窒化絶縁膜は、前記第1の窒化絶縁膜に接することを特徴とする半導体装置。 - 請求項1において、
前記第1のトランジスタ及び前記第2のトランジスタは、トップゲート構造であることを特徴とする半導体装置。 - 請求項1において、
前記絶縁膜は、さらに、前記第1の窒化絶縁膜と前記第2の窒化絶縁膜との間に設けられ、且つ前記第1の窒化絶縁膜及び前記第2の窒化絶縁膜に接して設けられた酸化絶縁膜を有することを特徴とする半導体装置。 - 請求項1において、
前記第2のトランジスタ上に第3の窒化絶縁膜を有することを特徴とする半導体装置。 - 請求項9において、
前記第3の窒化絶縁膜は、X線反射率法によって測定される密度が2.75g/cm3以上であること特徴とする半導体装置。 - 請求項9において、
前記第3の窒化絶縁膜の水素濃度が10原子%以上15原子%以下であることを特徴とする半導体装置。 - 請求項9において、
前記第3の窒化絶縁膜は、20℃以上25℃以下において0.5重量%のフッ酸に対するエッチング速度が2.0nm/分以下であることを特徴とする半導体装置。 - 第1のチャネル形成領域を含むシリコン半導体膜を有する、第1のトランジスタと、
前記第1のトランジスタ上にあって、第1の窒化絶縁膜及び前記第1の窒化絶縁膜上の第2の窒化絶縁膜を有する、絶縁膜と、
前記絶縁膜上にあって、第1の電極、第2の電極及び第2のチャネル形成領域を含む酸化物半導体膜を有する、第2のトランジスタと、を有し、
前記第1の電極及び前記第2の電極のそれぞれは、前記第2のチャネル形成領域と重畳し、
前記第1の電極は、前記第2の窒化絶縁膜と接し、
前記第2の窒化絶縁膜の水素濃度は、前記第1の窒化絶縁膜の水素濃度よりも低いことを特徴とする半導体装置。 - 請求項13において、
前記第2の窒化絶縁膜の密度が2.75g/cm3以上であること特徴とする半導体装置。 - 請求項13において、
前記第2の窒化絶縁膜の水素濃度が10原子%以上15原子%以下であることを特徴とする半導体装置。 - 請求項13において、
前記第2の窒化絶縁膜は、20℃以上25℃以下において0.5重量%のフッ酸に対するエッチング速度が2.0nm/分以下であることを特徴とする半導体装置。 - 第1のチャネル形成領域を含むシリコン半導体膜を有する、第1のトランジスタと、
前記第1のトランジスタ上にあって、第1の窒化絶縁膜及び前記第1の窒化絶縁膜上に接する第2の窒化絶縁膜を有する、絶縁膜と、
前記絶縁膜上にあって、第1の電極、第2の電極及び第2のチャネル形成領域を含む酸化物半導体膜を有する、第2のトランジスタと、を有し、
前記第1の電極及び前記第2の電極のそれぞれは、前記第2のチャネル形成領域と重畳し、
前記第1の電極は、前記第1の窒化絶縁膜と接し、
前記第2の窒化絶縁膜の水素濃度は、前記第1の窒化絶縁膜の水素濃度よりも低いことを特徴とする半導体装置。 - 請求項17において、
前記第2の窒化絶縁膜の密度が2.75g/cm3以上であること特徴とする半導体装置。 - 請求項17において、
前記第2の窒化絶縁膜の水素濃度が10原子%以上15原子%以下であることを特徴とする半導体装置。 - 請求項17において、
前記第2の窒化絶縁膜は、20℃以上25℃以下において0.5重量%のフッ酸に対するエッチング速度が2.0nm/分以下であることを特徴とする半導体装置。
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US20140027764A1 (en) | 2014-01-30 |
TWI588999B (zh) | 2017-06-21 |
US9793295B2 (en) | 2017-10-17 |
KR102439046B1 (ko) | 2022-08-31 |
US20180047753A1 (en) | 2018-02-15 |
TW201733127A (zh) | 2017-09-16 |
US9437594B2 (en) | 2016-09-06 |
KR20210040917A (ko) | 2021-04-14 |
KR20210148044A (ko) | 2021-12-07 |
KR20140013972A (ko) | 2014-02-05 |
JP2018011086A (ja) | 2018-01-18 |
JP6224931B2 (ja) | 2017-11-01 |
TW201411847A (zh) | 2014-03-16 |
TWI617035B (zh) | 2018-03-01 |
US10141337B2 (en) | 2018-11-27 |
KR20230149794A (ko) | 2023-10-27 |
KR20220123206A (ko) | 2022-09-06 |
JP6542857B2 (ja) | 2019-07-10 |
US20160372492A1 (en) | 2016-12-22 |
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