JP2009033024A - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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Abstract
【解決手段】半導体装置は、半導体層2内にCMOS1及びパワーMOSトランジスタ20が混載されている。CMOS1は、絶縁膜5を介して形成された第1ゲート電極9、第1ゲート電極9対応して設けられたソース領域3、ソース領域3と共に第1ゲート電極9を挟むように設けられたドレイン領域4から成る。パワーMOSトランジスタ20は、半導体層2上に絶縁膜30を介して形成された第2ゲート電極27、第2ゲート電極27に対応して設けられたソース領域24、ソース領域24と共に第2ゲート電極27を挟むように設けられたドリフト領域23、それに隣接するドレイン領域21から成る。第1及び第2ゲート電極9、27のサイドウォール8、26は厚さが異なる。
【選択図】図1
Description
図1は、本実施の形態に係る、CMOSトランジスタと低耐圧パワーMOSトランジスタとを同一基板上に混載して形成した半導体装置の構造断面図を略示したものである。
図5は、本実施の形態に係る、半導体装置の構造断面図を略示したものである。CMOSトランジスタ領域については、上記した第1の実施の形態と同様なので説明を省略する。本実施の形態に係る半導体装置のパワーMOSトランジスタ60は、P−型半導体層2にP型ボディ領域61を有する点で、上記した第1の実施の形態のパワーMOSトランジスタ20と異なる。P型ボディ領域61は、ソース側のコンタクト領域22、ソース領域24、LDD領域25を包囲し、一部がゲート酸化膜31の下方にまで延在するように形成されている。したがって、ゲート酸化膜31の下方での不純物濃度は、ドレイン側よりもソース側の方が高くなっている。P型ボディ領域61の不純物濃度のピークは、ソース領域24が形成されている半導体層の表面よりもさらに深い位置にある。
図8は、本実施の形態に係る、半導体装置の構造断面図を略示したものである。CMOSトランジスタ領域については、上記した第1の実施の形態と同様なので説明を省略する。本実施の形態に係るパワーMOSトランジスタ70は、ドリフト領域が2層構造を有する点で、上記した第1の実施の形態のパワーMOSトランジスタ20と異なる。チャネル領域7’の右側(ドレイン側)すなわちLDD領域25と共にゲート電極27を挟む位置には、深さ方向に異なる不純物分布を有する2層構造のドリフト領域が形成されている。
以上、発明の実施の形態を説明したが、本発明はこれらに限定されるものではなく、発明の趣旨を逸脱しない範囲内において、種々の変更、追加等が可能である。例えば、パワーMOSトランジスタのサイドウォールを形成する絶縁膜は3層に限定されず、それ以上の膜が積層されて形成されてもよい。
半導体層内に、CMOSトランジスタと、パワーMOSトランジスタとが形成され、
CMOSトランジスタは、
半導体層上に第1の絶縁膜を介して形成された第1ゲート電極と、
半導体層の内部に、第1ゲート電極に対応して設けられた第1ソース領域と、
半導体層の内部に、第1ソース領域と共に第1ゲート電極を挟むように設けられた第1ドレイン領域とを備え、
パワーMOSトランジスタは、
半導体層上に第2の絶縁膜を介して形成された第2ゲート電と、
半導体層の内部に、第2ゲート電極に対応して設けられた第2ソース領域と、
半導体層の内部に、第2ソース領域と共に第2ゲート電極を挟むように設けられたドリフト領域と、
半導体層の内部に、ドリフト領域に隣接し、第2ソース領域と共に第2ゲート電極を挟むように設けられた第2ドレイン領域とを備え、
第1ゲート電極の側面には第1サイドウォールが設けられ、第2ゲート電極の側面には第2サイドウォールが設けられ、第1サイドウォールの上記第1の絶縁膜に沿った幅と、第2サイドウォールの上記第2の絶縁膜に沿った幅とが異なることを特徴とする。
半導体層上に第1絶縁膜を介して第1ゲート電極と、第2絶縁膜を介して第2ゲート電極とを形成する工程と、
半導体層の内部に、第1ゲート電極に対応して設けられた第1LDD領域、半導体層の内部に、第1LDD領域と共に第1ゲート電極を挟むように設けられた第2LDD領域、及び半導体層の内部に、第2ゲート電極に対応して設けられた第3LDD領域を不純物イオン注入処理により同時に形成する工程と、
半導体層の内部に、第3LDD領域と共に第2ゲート電極を挟むように設けられたドリフト領域を不純物イオン注入処理により形成する工程と、
半導体層の表面全体に多層絶縁膜を堆積する工程と、
CMOSトランジスタ側の多層絶縁膜の少なくとも一層を等方性エッチングにより除去する工程と、
パワーMOSトランジスタ側の多層絶縁膜の少なくとも一層を第1の異方性エッチングによりエッチバックする工程と、
多層絶縁膜の残りを第2の異方性エッチングによりエッチバックして、第1ゲート電極の側面には第1サイドウォールを、第2ゲート電極の側面には第2サイドウォールをそれぞれ形成する工程と、
第1サイドウォールをマスクに使って半導体層の内部に第1LDD領域に対応して設けられた第1ソース領域及び半導体層の内部に第1ソース領域と共に第1ゲート電極を挟むように第2LDD領域に対応して設けられた第1ドレイン領域を、第2サイドウォールをマスクに使って半導体層の内部に第3LDD領域に対応して設けられた第2ソース領域及び半導体層の内部に第2ソース領域とともに第2ゲート電極を挟むように第3LDD領域に対応して設けられた第2ドレイン領域を、イオン注入により同時に形成する工程と、
を備えることを特徴とする。
半導体層上に第1絶縁膜を介して第1ゲート電極と、第2絶縁膜を介して第2ゲート電極とを形成する工程と、
半導体層の内部に、第1ゲート電極に対応して設けられた第1LDD領域、半導体層の内部に、第1LDD領域と共に第1ゲート電極を挟むように設けられた第2LDD領域、及び半導体層の内部に、第2ゲート電極に対応して設けられた第3LDD領域を不純物イオン注入処理により同時に形成する工程と、
半導体層の内部に、第3LDD領域と共に第2ゲート電極を挟むように設けられたドリフト領域を不純物イオン注入処理により形成する工程と、
半導体層の表面全体に多層絶縁膜を堆積する工程と、
パワーMOSトランジスタ側の多層絶縁膜の少なくとも一層を第1の異方性エッチングによりエッチバックする工程と、
CMOSトランジスタ側の多層絶縁膜の少なくとも一層を等方性エッチングにより除去する工程と、
多層絶縁膜の残りを第2の異方性エッチングによりエッチバックして、第1ゲート電極の側面には第1サイドウォールを、第2ゲート電極の側面には第2サイドウォールをそれぞれ形成する工程と、
第1サイドウォールをマスクに使って半導体層の内部に第1LDD領域に対応して設けられた第1ソース領域及び半導体層の内部に第1ソース領域と共に第1ゲート電極を挟むように第2LDD領域に対応して設けられた第1ドレイン領域を、第2サイドウォールをマスクに使って半導体層の内部に第3LDD領域に隣接して位置する第2ソース領域及び半導体層の内部に第2ソース領域とともに第2ゲート電極を挟むように第3LDD領域に対応して設けられた第2ドレイン領域を、イオン注入により同時に形成する工程と、
を備えることを特徴とする。
第1の異方性エッチング及び第2の異方性エッチングはRIEであることを特徴とする。
Claims (5)
- 半導体層内に、CMOSトランジスタと、パワーMOSトランジスタとが形成され、
前記CMOSトランジスタは、
前記半導体層上に第1の絶縁膜を介して形成された第1ゲート電極と、
前記半導体層の内部に、前記第1ゲート電極に対応して設けられた第1ソース領域と、
前記半導体層の内部に、前記第1ソース領域と共に前記第1ゲート電極を挟むように設けられた第1ドレイン領域とを備え、
前記パワーMOSトランジスタは、
前記半導体層上に第2の絶縁膜を介して形成された第2ゲート電極と、
前記半導体層の内部に、前記第2ゲート電極に対応して設けられた第2ソース領域と、
前記半導体層の内部に、前記第2ソース領域と共に前記第2ゲート電極を挟むように設けられたドリフト領域と、
前記半導体層の内部に、前記ドリフト領域に隣接し、前記第2ソース領域と共に前記第2ゲート電極を挟むように設けられた第2ドレイン領域とを備え、
前記第1ゲート電極の側面には第1サイドウォールが設けられ、前記第2ゲート電極の側面には第2サイドウォールが設けられ、前記第1サイドウォールの前記第1の絶縁膜に沿った幅と、前記第2サイドウォールの前記第2の絶縁膜に沿った幅とが異なることを特徴とする半導体装置。 - 前記パワーMOSトランジスタは、さらに、前記第2ソース領域を包囲するように設けられ、前記半導体層よりも不純物濃度が高いボディ領域を有し、前記ボディ領域は前記パワーMOSトランジスタの前記第2ゲート電極の下方まで延在していることを特徴とする請求項1に記載の半導体装置。
- 前記第2サイドウォールの前記第2の絶縁膜に沿った幅が、前記第1サイドウォールの前記第1の絶縁膜に沿った幅より大きいことを特徴とする請求項1または2に記載の半導体装置。
- 前記第1サイドウォール及び第2サイドウォールが、それぞれ多層膜構造から成ることを特徴とする請求項1から3のいずれか1項に記載の半導体装置。
- 半導体層内に、CMOSトランジスタと、パワーMOSトランジスタとを含む半導体装置の製造方法において、
前記半導体層上にゲート電極を形成する工程と、
前記半導体層の表面全体に多層絶縁膜を堆積する工程と、
前記CMOSトランジスタ側の前記多層絶縁膜の少なくとも一層を等方性エッチングにより除去する工程と、
前記パワーMOSトランジスタ側の前記多層絶縁膜の少なくとも一層を第1の異方性エッチングによりエッチバックする工程と、
前記多層絶縁膜の残りの膜を第2の異方性エッチングによりエッチバックする工程と、
を含むことを特徴とする半導体装置の製造方法。
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JP2011009695A (ja) * | 2009-05-29 | 2011-01-13 | Toshiba Corp | 不揮発性半導体記憶装置及びディプレッション型mosトランジスタ |
JP4966351B2 (ja) * | 2009-09-24 | 2012-07-04 | 株式会社東芝 | 半導体装置 |
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