JP2006040947A - 半導体装置及びその製造方法 - Google Patents
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Abstract
【解決手段】本発明の半導体装置は、抵抗体5eの上がシリコン酸化膜22によって覆われ、非シリサイド領域であるMISトランジスタ33, 34のゲート電極5c, 5dや不純物拡散層19, 21が露出した状態で、不純物活性化のための熱処理やシリサイド化が行われる。これにより、不純物のオートドープが抑制されるため抵抗体の抵抗値のばらつきが抑制されると共に、不純物の活性化のための熱処理の際にMISトランジスタ33, 34のゲート電極5b, 5c等が露出しているためMISトランジスタ33, 34のゲート絶縁膜4c, 4dが破壊されにくくなる。
【選択図】図1
Description
以下に、本発明の第1の実施形態に係る半導体装置及びその製造方法について図面を参照しながら説明する。図1は、本発明の第1の実施形態に係る半導体装置の構造を示す断面図である。図1には、左側から、第1のPMISトランジスタ形成領域(第1PMIS領域)PTr1と、第2のPMISトランジスタ形成領域(第2PMIS領域)PTr2と、第3のPMISトランジスタ形成領域(第3PMIS領域)PTr3と、NMISトランジスタ形成領域(NMIS領域)NTrと、抵抗形成領域(抵抗領域)Rとが順次示してある。そして、半導体基板1のうち第1PMIS領域PTr1、第2PMIS領域PTr2及び第3PMIS領域PTr3に配置する領域にはN型ウェル領域2aが設けられ、半導体基板1のうちNMIS領域NTr及び抵抗領域Rに配置する領域には、P型ウェル領域2bが形成されており、半導体基板1における各領域の活性領域はシャロートレンチ型の素子分離領域3によって分離されている。各トランジスタ領域PTr1〜PTr3, NTrに設けられるトランジスタとしては種々の組み合わせが想定されるが、本実施形態では、第1PMIS領域PTr1には内部回路用保護回路のトランジスタを、第2PMIS領域PTr2には周辺回路用保護回路のトランジスタを、第3PMIS領域PTr3及びNMIS領域NTrには内部回路となるロジック回路のトランジスタを設ける場合を例として、各トランジスタにおけるトランジスタサイズや不純物濃度等の説明を行う。
以下に、第1の実施形態の変形例について、図面を参照しながら説明する。第1の実施形態では、トランジスタPTr1〜PTr3, NTrを設けたが、本変形例では1つのトランジスタと抵抗体とを設ける場合について説明する。なお、抵抗体の構成は第1の実施形態で述べたものと同様であるので、図示及び説明を省略する。
2a N型ウェル領域
2b P型ウェル領域
3 素子分離領域
4a〜4d, 4aa ゲート絶縁膜
5a〜5d, 5aa ゲート電極
5e 抵抗体
6 レジスト
7 低濃度P型拡散層
8 第1のサイドウォール
9 レジスト
10 低濃度N型拡散層
11 P型ポケット拡散層
12 レジスト
13 低濃度P型拡散層
14 N型ポケット拡散層
15 第2のサイドウォール
16 レジスト
17 極低濃度P型拡散層
18 レジスト
19 高濃度P型拡散層
19D 高濃度ドレイン領域
19S 高濃度ソース領域
20 レジスト
21 高濃度N型拡散層
22 シリコン酸化膜
23 レジスト
24 コバルトシリサイド膜
25 層間絶縁膜
26 コンタクトプラグ
26D ドレインコンタクトプラグ
26S ソースコンタクトプラグ
27 配線層
28 ドレインコンタクト形成領域
31 第1のPMISトランジスタ
32 第2のPMISトランジスタ
33 第3のPMISトランジスタ
34 NMISトランジスタ
35 抵抗体
36 PMISトランジスタ
Claims (9)
- 抵抗体とMISトランジスタとを有する半導体装置であって、
上記MISトランジスタは、
半導体基板の活性領域の側方を囲む素子分離領域と、
上記活性領域の上に設けられたゲート絶縁膜と、
上記ゲート絶縁膜の上に設けられたゲート電極と、
上記活性領域のうち上記ゲート電極の側方下に位置する領域に設けられた不純物拡散層とを備え、
上記抵抗体は、
上記素子分離領域の上に設けられ、シリコンを含む抵抗体と、
上記抵抗体の上の少なくとも一部を覆う絶縁膜とを備え、
少なくとも上記ゲート電極の上には、上記絶縁膜が設けられていないことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
上記絶縁膜は、上記抵抗体の上面および側面を覆っていることを特徴とする半導体装置。 - 請求項1又は2に記載の半導体装置であって、
上記ゲート電極の上には、シリサイド膜が設けられていることを特徴とする半導体装置。 - 請求項3に記載の半導体装置であって、
上記不純物拡散層はソース領域及びドレイン領域を含み、上記ドレイン領域の一部の領域の上には、絶縁膜が設けられていることを特徴とする半導体装置。 - 半導体基板の活性領域の側方を囲む素子分離領域を形成する工程(a)と、
上記工程(a)の後に、上記活性領域の上にゲート絶縁膜を形成する工程(b)と、
上記工程(b)の後に、上記ゲート絶縁膜の上にゲート電極を形成する工程(c)と、
上記工程(a)の後に、上記素子分離領域の上にシリコンを含む抵抗体を形成する工程(d)と、
上記工程(c)の後に、上記活性領域のうち上記ゲート電極の側方下に位置する領域に、不純物をイオン注入して不純物拡散層を形成する工程(e)と、
上記工程(d)の後に、上記抵抗体の少なくとも一部の上を覆い、上記ゲート電極の上を覆わない絶縁膜を形成する工程(f)と、
上記工程(f)の後に、上記不純物拡散層の上記不純物を活性化するための熱処理を行う工程(g)とを備えることを特徴とする半導体装置の製造方法。 - 請求項6に記載の半導体装置の製造方法であって、
上記工程(f)では、上記絶縁膜によって上記抵抗体の上面および側面を覆うことを特徴とする半導体装置の製造方法。 - 請求項6に記載の半導体装置の製造方法であって、
上記工程(f)では、上記半導体基板の上方全体に上記絶縁膜を形成した後、上記絶縁膜のうち上記ゲート電極の上に位置する部分を除去することを特徴とする半導体装置の製造方法。 - 請求項5〜7のうちいずれか1項に記載の半導体装置の製造方法であって、
上記工程(f)の後に、上記半導体基板の上方に金属膜を形成した後熱処理を行うことにより、少なくとも上記ゲート電極の上にシリサイド膜を形成する工程をさらに備えることを特徴とする半導体装置の製造方法。 - 請求項8に記載の半導体装置の製造方法であって、
上記不純物拡散層はソース領域及びドレイン領域を含み、
上記工程(f)では、上記絶縁膜のうち上記ドレイン領域においてコンタクト形成領域を除く部分の上に位置する部分を残すことを特徴とする半導体装置の製造方法。
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JP2004214611A JP2006040947A (ja) | 2004-07-22 | 2004-07-22 | 半導体装置及びその製造方法 |
CNA2005100859552A CN1725490A (zh) | 2004-07-22 | 2005-07-21 | 半导体装置及其制造方法 |
US11/186,785 US7538397B2 (en) | 2004-07-22 | 2005-07-22 | Semiconductor device and method for fabricating the same |
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Cited By (2)
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JP2008103562A (ja) * | 2006-10-19 | 2008-05-01 | Fuji Electric Device Technology Co Ltd | 半導体装置の製造方法 |
JP2020104211A (ja) * | 2018-12-27 | 2020-07-09 | 株式会社Sumco | 両頭研削方法 |
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JP2008103562A (ja) * | 2006-10-19 | 2008-05-01 | Fuji Electric Device Technology Co Ltd | 半導体装置の製造方法 |
JP2020104211A (ja) * | 2018-12-27 | 2020-07-09 | 株式会社Sumco | 両頭研削方法 |
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US7538397B2 (en) | 2009-05-26 |
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