JP2005183686A - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 37
- 238000002955 isolation Methods 0.000 claims abstract description 146
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- 239000010937 tungsten Substances 0.000 description 1
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Abstract
【解決手段】抵抗領域RRにおいては、スパイラルインダクタSIの配設領域に対応するSOI層3の表面内にトレンチ分離絶縁膜4がSOI層3を間に挟んで複数配設され、各トレンチ分離絶縁膜4上に抵抗素子30がそれぞれ配設されている。トレンチ分離絶縁膜4は、中央部分においてはSOI層3を貫通して埋め込み酸化膜2に達して完全分離構造となり、両端縁部においては、その下部にSOI層3を有して部分分離構造となった併合分離構造を有している。
【選択図】図3
Description
図1に高周波アナログ回路の一例として、電流作動型のバッファ回路BFの構成を示す。この駆動電源VCCに並列に接続されたスパイラルインダクタI1およびI2、スパイラルインダクタI1およびI2にそれぞれ接続された抵抗R1およびR2、抵抗R1およびR2に、それぞれのドレインが接続されたNチャネルトランジスタT1およびT2、NチャネルトランジスタT1およびT2のソースが共通に接続される電流源CSとを備えている。
<A.装置構成>
本発明に係る半導体装置の実施の形態として、図2を用いてSOIデバイス100の平面構成を説明する。
なお、MOSトランジスタ10の配設領域とMOSトランジスタ20の配設領域とは電気的に絶縁されており、その様子を図2においては便宜的に破線Xで示している。
<B−1.トレンチ分離絶縁膜の形成>
まず、製造工程を順に示す図6〜図13を用いて、トレンチ分離絶縁膜4の製造方法について説明する。なお、図6〜図13では抵抗領域のみを例示しており、半導体素子領域は省略している。
次に、製造工程を順に示す図16〜図25を用いて、半導体素子の製造方法について説明する。なお、図16〜図25では抵抗領域および半導体素子領域を例示している。
以上説明したSOIデバイス100においては、スパイラルインダクタSIの下方に対応する抵抗領域RRのSOI層3の表面内に、併合分離構造のトレンチ分離絶縁膜4をSOI層3を間に挟むようにして飛び飛びに配置するようにしたので、単一のトレンチ分離絶縁膜が広い面積に渡って存在することがないので、トレンチ分離絶縁膜4の形成時のCMP処理においてディッシングが発生することを防止できる。
以上説明した実施の形態では、抵抗領域RRのSOI層3には、半導体素子の形成時に不純物が導入されることを防止して、SOI層3を高抵抗に保つこと、あるいは電圧条件によっては完全空乏化が可能となるように構成したが、例えば、ソース・ドレイン注入に際して抵抗素子30にも不純物を注入すると、抵抗素子30の抵抗値を低くできる。このとき、抵抗領域RRにおいては、抵抗領域RR上全域を開口部とするレジストマスクを形成するのではなく、抵抗素子30の上部だけが開口部となったレジストマスクを形成することで、トレンチ分離絶縁膜4間のSOI層3には不純物が注入されることを防止できる。
以上説明した実施の形態では、抵抗領域RRにおいては併合分離構造のトレンチ分離絶縁膜4をSOI層3を間に挟むようにして飛び飛びに配置し、その上に抵抗素子30を配設したが、トレンチ分離絶縁膜4の代わりに、完全分離構造のトレンチ分離絶縁膜を配設するようにしても良い。以下、当該構成について製造工程を順に示す図26〜図29を用いて説明する。
以上説明した実施の形態では、抵抗領域RRのSOI層3には、半導体素子の形成時に不純物が導入されることを防止しているので、SOI層3を高抵抗に保つこと、あるいは電圧条件によっては完全空乏化が可能となることを説明したが、これは分離絶縁膜にも不純物が導入されないことを意味しており、その結果、素子領域に比べて、分離絶縁膜の膜厚を厚くすることが可能となる。
以上説明した実施の形態では、抵抗領域RRのSOI層3の表面内に、併合分離構造のトレンチ分離絶縁膜4をSOI層3を間に挟むようにして飛び飛びに配置することで、トレンチ分離絶縁膜4の形成時のCMP処理においてディッシングが発生することを防止する構成を示したが、SOI層3の配設はトレンチ分離絶縁膜4の間、すなわち抵抗素子30の間に限定されるものではなく、例えば図31に示すように、抵抗素子30の長手方向の両端部外側の位置に配置しても良い。
以上説明した実施の形態およびその変形例では、抵抗領域RRのSOI層3の表面内に設けられた併合分離構造のトレンチ分離絶縁膜4あるいは完全分離構造のトレンチ分離絶縁膜4B上に抵抗素子30を配設する構成を示したが、SOI層3上に抵抗素子を配設する構成としても良い。当該構成について図32を用いて説明する。
Claims (12)
- 土台となる基板部、該基板部上に配設された埋め込み酸化膜、および該埋め込み酸化膜上に配設されたSOI層を有するSOI基板と、
前記SOI基板の上方に配設されたインダクタンス素子と、
前記インダクタンス素子の下部に相当する第1の領域の前記SOI層の主面内に、間に前記SOI層を挟んで配設された複数の第1の素子分離絶縁膜と、
前記第1の領域の前記複数の第1の素子分離絶縁膜上にそれぞれ配設された、複数の抵抗素子と、を備え、
前記複数の第1の素子分離絶縁膜のそれぞれは、少なくとも一部分が前記SOI層を貫通して前記埋め込み酸化膜に達する完全分離構造をなす、半導体装置。 - 土台となる基板部、該基板部上に配設された埋め込み酸化膜、および該埋め込み酸化膜上に配設されたSOI層を有するSOI基板と、
前記SOI基板の上方に配設されたインダクタンス素子と、
前記インダクタンス素子の下部に相当する第1の領域の前記SOI層の主面内に、間に前記SOI層を挟んで配設された複数の第1の素子分離絶縁膜と、
前記複数の第1の素子分離絶縁膜の間の前記SOI層上に、それぞれ絶縁膜を介して配設された、複数の抵抗素子と、を備え、
前記複数の第1の素子分離絶縁膜のそれぞれは、少なくとも一部分が前記SOI層を貫通して前記埋め込み酸化膜に達する完全分離構造をなす、半導体装置。 - 前記複数の第1の素子分離絶縁膜のそれぞれは、その断面形状において、中央部分は前記完全分離構造をなし、両端部分は、その下部に前記SOI層を有する部分分離構造をなす、併合分離構造を有する、請求項1または請求項2記載の半導体装置。
- 前記複数の第1の素子分離絶縁膜のそれぞれは、その断面形状において、全体が前記完全分離構造を有する、請求項1または請求項2記載の半導体装置。
- 前記第1の領域の前記SOI層は、完全空乏化状態を可能とする濃度に不純物を含む、請求項1または請求項2記載の半導体装置。
- 複数の半導体素子が配設される第2の領域の前記SOI層の主面内に配設された第2の素子分離絶縁膜を備え、
前記複数の第1の素子分離絶縁膜は、前記第2の素子分離絶縁膜の厚さよりも厚い、請求項5記載の半導体装置。 - 前記複数の第1の素子分離絶縁膜のそれぞれの平面視形状は、第1の方向に細長く延在する細長形状を有し、
前記複数の第1の素子分離絶縁膜は、前記第1の方向とは直交する第2の方向に並列して配列され、
前記第1の領域の前記SOI層は、前記複数の第1の素子分離絶縁膜の配列間に少なくとも配設される、請求項1または請求項2記載の半導体装置。 - 前記第1の領域の前記SOI層は、前記複数の第1の素子分離絶縁膜の前記第1の方向の両端部外側の位置にも配設される、請求項7記載の半導体装置。
- 前記第1の領域とは異なる第2の領域に配設されたMOSトランジスタを備え、
前記MOSトランジスタは、第2の領域の前記SOI層上に配設されたゲート絶縁膜を有し、
前記第1の領域の前記SOI層上の前記絶縁膜の厚さは、前記ゲート絶縁膜よりも厚い、請求項2記載の半導体装置。 - 前記複数の抵抗素子はポリシリコンで構成される、請求項1または請求項2記載の半導体装置。
- 土台となる基板部、該基板部上に配設された埋め込み酸化膜、および該埋め込み酸化膜上に配設されたSOI層を有するSOI基板の上方に配設されたインダクタンス素子と、前記インダクタンス素子の下部に相当する第1の領域の前記SOI層の主面内に、間に前記SOI層を挟んで配設された複数の素子分離絶縁膜と、前記第1の領域の前記複数の素子分離絶縁膜上または前記複数の素子分離絶縁膜間の前記SOI層上にそれぞれ配設された、複数の抵抗素子と、前記第1の領域とは異なる第2の領域に配設されたMOSトランジスタとを備えた半導体装置の製造方法であって、
(a)前記第1の領域の前記SOI層の主面内に、前記複数の素子分離絶縁膜を形成する工程と、
(b)前記第2の領域の前記SOI層内に、イオン注入により前記MOSトランジスタのしきい値電圧を設定するための不純物を導入する工程と、
(c)前記工程(b)の後に、前記第1および第2の領域に渡るようにポリシリコン層を形成する工程と、
(d)前記第1および第2の領域の前記ポリシリコン層をそれぞれパターニングして、前記複数の抵抗素子および前記MOSトランジスタのゲート電極を形成する工程と、を備え、
前記工程(b)は、前記第1の領域上をマスクで覆い、前記第1の領域への前記不純物の導入を防止する工程を含む、半導体装置の製造方法。 - (e)前記工程(d)の後に、前記第2の領域の前記SOI層内に、イオン注入により前記MOSトランジスタのソース・ドレイン層を形成するためのソース・ドレイン不純物を導入する工程をさらに備え、
前記工程(e)は、前記第1の領域上をマスクで覆い、前記第1の領域への前記ソース・ドレイン不純物の導入を防止する工程を含む、請求項11記載の半導体装置の製造方法。
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