JP7385540B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP7385540B2 JP7385540B2 JP2020148113A JP2020148113A JP7385540B2 JP 7385540 B2 JP7385540 B2 JP 7385540B2 JP 2020148113 A JP2020148113 A JP 2020148113A JP 2020148113 A JP2020148113 A JP 2020148113A JP 7385540 B2 JP7385540 B2 JP 7385540B2
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Description
<メモリセルMCの構成>
以下に実施の形態1における半導体装置およびこの半導体装置の製造方法を説明するが、まず、図1および図2を用いて、半導体装置に含まれるSRAM回路のメモリセルMCについて説明する。
以下に、実施の形態1における半導体装置を、図15を用いて説明する。まず、半導体装置が備える各領域1A~4Aについて説明する。
次に、本実施の形態1における半導体装置の製造方法を、図3~図16を用いて説明する。
以下に、実施の形態2における半導体装置の製造方法を、図17~図25を用いて説明する。なお、以下の説明では、実施の形態1との相違点を主に説明する。
以下に、実施の形態3における半導体装置の製造方法を、図26を用いて説明する。なお、以下の説明では、実施の形態2との相違点を主に説明する。
以下に、実施の形態3の変形例1における半導体装置の製造方法を、図27を用いて説明する。なお、以下の説明では、実施の形態3との相違点を主に説明する。
以下に、実施の形態3の変形例2における半導体装置の製造方法を、図28および図29を用いて説明する。なお、以下の説明では、実施の形態3との相違点を主に説明する。図28および図29は、それぞれ図2に示されるD-D線(直線)およびE-E線(直線)に沿った断面図である。
Acc1、Acc2 アクセストランジスタ
AcN1、AcN2 活性領域
AcP1、AcP2 活性領域
BL、/BL ビット線
BOX 絶縁層
CF1、CF2 導電性膜
CP キャップ膜
Dr1、Dr2 ドライバトランジスタ
EXN エクステンション領域
EXP エクステンション領域
FA フィン(突出部)
GE1~GE7 ゲート電極
GP ゲートパターン
GI1~GI3 ゲート絶縁膜
IF1~IF5 絶縁膜
IL0~IL2 層間絶縁膜
Lo1、Lo2 ロードトランジスタ
M1、M2 配線
MC メモリセル
MPAD 金属パッド層
N1、N2 ノード
ND 拡散領域
NW ウェル領域
PAD パッド層
PD 拡散領域
PG プラグ
RP レジストパターン
SI シリサイド層
SL 半導体層
SPG シェアードコンタクトプラグ
STI 素子分離部
SUB 半導体基板
SW サイドウォールスペーサ
Vbg1、Vbg2 バックゲート電圧
Vdd 電源電圧
Vss 基準電圧
WL ワード線
Claims (18)
- (a)半導体基板、前記半導体基板上に形成された絶縁層、および、前記絶縁層上に形成された半導体層を有するSOI基板を準備する工程;
(b)前記(a)工程後、前記半導体層上に、第1導電性膜を形成する工程;
(c)前記(b)工程後、前記第1導電性膜上に、第1絶縁膜を形成する工程;
(d)前記(c)工程後、前記第1導電性膜および前記第1絶縁膜をパターニングすることで、ゲートパターンおよびキャップ膜を形成する工程;
(e)前記(d)工程後、前記ゲートパターンの両側に位置する前記半導体層に不純物を注入することで、第1不純物領域を形成する工程;
(f)前記(e)工程後、前記ゲートパターンの側面上に、第2絶縁膜からなる第1サイドウォールスペーサを形成する工程;
(g)前記(f)工程後、前記ゲートパターン、前記キャップ膜および前記第1サイドウォールスペーサを覆うように、前記第1不純物領域上に、第2導電性膜を形成する工程;
(h)前記(g)工程後、前記キャップ膜が露出されるまで、前記第2導電性膜に対して研磨処理を施す工程;
(i)前記(h)工程後、前記第2導電性膜の一部をパターニングすることで、残された前記第2導電性膜からなるパッド層を形成する工程;
(j)前記(i)工程後、前記第2導電性膜が除去された箇所に対して、第3絶縁膜を埋め込む工程;
を備える、半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
(k)前記(j)工程後、前記キャップ膜が除去され、且つ、前記ゲートパターンが露出されるまで、前記キャップ膜、前記第1サイドウォールスペーサ、前記第3絶縁膜および前記パッド層に対して研磨処理を施す工程;
を更に備える、半導体装置の製造方法。 - 請求項2に記載の半導体装置の製造方法において、
(l)前記(k)工程後、前記ゲートパターンおよび前記パッド層に、不純物を注入する工程;
(m)前記(l)工程後、前記ゲートパターンおよび前記パッド層の各々の上面に、シリサイド層を形成する工程;
を更に備える、半導体装置の製造方法。 - 請求項2に記載の半導体装置の製造方法において、
(n)前記(a)工程と前記(b)工程との間に、前記半導体層および前記絶縁層を貫通し、且つ、前記半導体基板に達する溝を形成し、前記溝内に第4絶縁膜を埋め込むことで、素子分離部を形成する工程;
を更に備え、
前記素子分離部によって、前記半導体層、前記絶縁層および前記半導体基板は、複数の活性領域に区画され、
前記複数の活性領域は、第1活性領域、および、平面視において前記素子分離部を介して前記第1活性領域に隣接する第2活性領域を含み、
前記第1活性領域の前記半導体層に形成された前記第1不純物領域と、前記第2活性領域の前記半導体層に形成された前記第1不純物領域とは、同一の前記パッド層によって接続されている、半導体装置の製造方法。 - 請求項4に記載の半導体装置の製造方法において、
前記第3絶縁膜は、前記素子分離部上に位置している、半導体装置の製造方法。 - 請求項4に記載の半導体装置の製造方法において、
(o)前記(k)工程後、前記ゲートパターン上および前記パッド層上に、複数のプラグを形成する工程;
を更に備え、
前記複数の活性領域は、平面視において前記素子分離部を介して前記第1活性領域に隣接する第3活性領域を含み、
前記第3活性領域の前記ゲートパターンは、前記第3活性領域の前記第1サイドウォールスペーサを介して前記第1活性領域の前記パッド層に隣接するように、前記素子分離部上に延在し、
前記複数のプラグは、前記第3活性領域の前記ゲートパターンおよび前記第1活性領域の前記パッド層の両方に接続されるシェアードコンタクトプラグを含む、半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記(g)工程は、前記第2導電性膜上に、塗布法によって第5絶縁膜を形成する工程を更に含み、
前記第5絶縁膜は、前記(h)工程の前記研磨処理によって除去される、半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記第2導電性膜は、シリコンからなる、半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記第1絶縁膜および前記第3絶縁膜は、酸化シリコンからなり、
前記第2絶縁膜は、窒化シリコンからなる、半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
(p)前記(j)工程後、前記パッド層の上面が前記ゲートパターンの上面よりも低くなるように、前記パッド層の上面を後退させる工程;
(q)前記(p)工程後、前記ゲートパターン、前記キャップ膜および前記第1サイドウォールスペーサを覆うように、前記パッド層上に第6絶縁膜を形成する工程;
(r)前記(q)工程後、前記第6絶縁膜および前記キャップ膜に対して異方性エッチング処理を施すことで、前記キャップ膜を除去し、前記ゲートパターンの側面上に、前記第6絶縁膜からなる第2サイドウォールスペーサを形成する工程;
(s)前記(r)工程後、前記第2サイドウォールスペーサから露出している前記ゲートパターンの上面および前記パッド層の上面に、それぞれ第1シリサイド層および第2シリサイド層を形成する工程;
(t)前記(s)工程後、前記第1シリサイド層上および前記第2シリサイド層上に、第7絶縁膜を形成する工程;
(u)前記(t)工程後、前記パッド層の上面に形成されている前記第2シリサイド層が前記第7絶縁膜によって覆われ、且つ、前記ゲートパターンの上面に形成されていた前記第1シリサイド層が除去されるように、前記第7絶縁膜に対して研磨処理を施す工程;
(v)前記(u)工程後、前記ゲートパターンを除去し、前記ゲートパターンが除去された箇所に、金属膜を埋め込む工程;
(w)前記(v)工程後、前記第2シリサイド層が露出するまで、前記第7絶縁膜に対して研磨処理を施す工程;
を更に備える、半導体装置の製造方法。 - 請求項10に記載の半導体装置の製造方法において、
(n)前記(a)工程と前記(b)工程との間に、前記半導体層および前記絶縁層を貫通し、且つ、前記半導体基板に達する溝を形成し、前記溝内に第4絶縁膜を埋め込むことで、素子分離部を形成する工程;
を更に備え、
前記第3絶縁膜は、前記素子分離部上に位置しており、
前記素子分離部によって、前記半導体層、前記絶縁層および前記半導体基板は、複数の活性領域に区画され、
前記複数の活性領域は、第1活性領域、および、平面視において前記素子分離部を介して前記第1活性領域に隣接する第2活性領域を含み、
前記第1活性領域の前記半導体層に形成された前記第1不純物領域と、前記第2活性領域の前記半導体層に形成された前記第1不純物領域とは、同一の前記パッド層によって接続されている、半導体装置の製造方法。 - 請求項11に記載の半導体装置の製造方法において、
(x)前記(w)工程後、前記金属膜上および前記第2シリサイド層上に、複数のプラグを形成する工程;
を更に備え、
前記複数の活性領域は、平面視において前記素子分離部を介して前記第1活性領域に隣接する第3活性領域を含み、
前記第3活性領域の前記金属膜は、前記第3活性領域の前記第1サイドウォールスペーサを介して前記第1活性領域の前記パッド層に隣接するように、前記素子分離部上に延在し、
前記複数のプラグは、前記第3活性領域の前記金属膜および前記第1活性領域の前記第2シリサイド層の両方に接続されるシェアードコンタクトプラグを含む、半導体装置の製造方法。 - 請求項10に記載の半導体装置の製造方法において、
(y)前記(a)工程と前記(b)工程の間に、前記SOI基板の前記半導体層および前記絶縁層の一部を除去することで、バルク領域を形成する工程;
を更に備え、
前記バルク領域の前記半導体基板上においても、前記(b)工程~前記(j)工程および前記(p)工程~前記(w)工程が行われ、
前記(v)工程では、前記バルク領域の前記ゲートパターンは残され、
前記(w)工程後、前記バルク領域の前記ゲートパターンの上面に、第3シリサイド層を形成する工程が行われる、半導体装置の製造方法。 - (a)半導体基板上に、第1導電性膜を形成する工程;
(b)前記(a)工程後、前記第1導電性膜上に、第1絶縁膜を形成する工程;
(c)前記(b)工程後、前記第1導電性膜および前記第1絶縁膜をパターニングすることで、ゲートパターンおよびキャップ膜を形成する工程;
(d)前記(c)工程後、前記ゲートパターンの両側に位置する前記半導体基板に不純物を注入することで、第1不純物領域を形成する工程;
(e)前記(d)工程後、前記ゲートパターンの側面上に、第2絶縁膜からなる第1サイドウォールスペーサを形成する工程;
(f)前記(e)工程後、前記ゲートパターン、前記キャップ膜および前記第1サイドウォールスペーサを覆うように、前記第1不純物領域上に、第2導電性膜を形成する工程;
(g)前記(f)工程後、前記キャップ膜が露出されるまで、前記第2導電性膜に対して研磨処理を施す工程;
(h)前記(g)工程後、前記第2導電性膜の一部をパターニングすることで、パッド層を形成する工程;
(i)前記(h)工程後、前記第2導電性膜がパターニングされた箇所に対して、第3絶縁膜を埋め込む工程;
を備える、半導体装置の製造方法。 - 請求項14に記載の半導体装置の製造方法において、
(j)前記(i)工程後、前記パッド層の上面に、シリサイド層を形成する工程;
を更に備え、
前記第1導電性膜および前記第2導電性膜は、それぞれシリコンからなる、半導体装置の製造方法。 - 請求項14に記載の半導体装置の製造方法において、
(k)前記(e)工程と前記(f)工程との間に、前記第1サイドウォールスペーサを介して前記ゲートパターンの両側に位置する前記半導体基板に不純物を注入することで、前記第1不純物領域よりも高い不純物濃度を有する第2不純物領域を形成する工程;
(l)前記(k)工程と前記(f)工程との間に、前記第2不純物領域上にシリサイド層を形成する工程;
を更に備え、
前記(f)工程において、前記第2導電性膜は、前記シリサイド層上に形成され、
前記第2導電性膜は、バリアメタル膜、および、前記バリアメタル膜上に形成された金属膜を含む積層膜からなる、半導体装置の製造方法。 - 請求項14に記載の半導体装置の製造方法において、
(m)前記(a)工程前、前記半導体基板の一部に対してエッチング処理を施すことで、前記半導体基板の上面から突出した突出部を形成する工程;
を更に備え、
前記ゲートパターンおよび前記パッド層は、前記突出部の上面および側面を覆うように、前記半導体基板の上面に形成されている、半導体装置の製造方法。 - 請求項14に記載の半導体装置の製造方法において、
(n)前記(a)工程前に、前記半導体基板に溝を形成し、前記溝内に第4絶縁膜を埋め込むことで、素子分離部を形成する工程;
を更に備え、
前記第3絶縁膜は、前記素子分離部上に位置している、半導体装置の製造方法。
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