JP7458958B2 - 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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Description
本実施の形態1の半導体装置の製造工程を、図面を参照して説明する。図1は、本実施の形態1の半導体装置の製造工程で用いられるSOI基板の平面図であり、図2~図17は、本実施の形態1の半導体装置の製造工程中の要部断面図である。
図18は、本発明者が検討した第1検討例の半導体装置の製造工程中の要部断面図である。
次に、本実施の形態1におけるVC検査について、図20を参照して説明する。図20は、本実施の形態1の半導体装置の製造工程中の要部断面図であり、上記図14のTEG領域1Bの断面に対応する断面が示されているが、以下の点が上記図14と相違している。
次に、TEG領域1Bにおいて、半導体基板SBと半導体層SMとを電気的に接続するためのプラグP2aの形成位置について説明する。図22は、TEG領域1Bに形成されたTEGの平面レイアウトの一例を示す平面図である。図22において、X方向とY方向とは、互いに直交する方向である。なお、プラグP2aは、コンタクトホールC2aに埋め込まれているため、プラグP2aの形成位置は、コンタクトホールC2aの形成位置と実質的に同じである。
図24は、本実施の形態2の半導体装置の製造工程中の要部平面図であり、図25~図27は、本実施の形態2の半導体装置の製造工程中の要部平面図である。図24~図27には、TEG領域1Bの一部が示されている。図24のA1-A1線の位置での断面図が、図25にほぼ対応し、図24のA2-A2の位置での断面図が、図26にほぼ対応し、図24のA3-A3の位置での断面図が、図27にほぼ対応している。なお、図24~図27の場合は、平面視において周囲を素子分離領域で囲まれた半導体層SM(SM1)にそれぞれ1つのMISFETが形成されている場合が示されているが、周囲を素子分離領域で囲まれた半導体層SM(SM1)に形成されるMISFETの数は、2つ以上であってもよい。
1A 回路領域
1B TEG領域
2,3,3a,3b MISFET
BX,BX21 絶縁層
C1g,C1s,C2a,C2g,C2s コンタクトホール
CP 絶縁膜
CR チップ領域
CT コンタクトホール
EP 半導体層
EX n-型半導体領域
GE,GE11,GE22 ゲート電極
GF,GF11,GF21 ゲート絶縁膜
IL1,IL2 絶縁膜
L1,L2,L3,L4,L5,L6,L11,L21 絶縁膜
M1,M2,M3,M4 配線
M1g,M1g1,M1g2,M1s1,M1s2,M2g 配線
MS,MS11,MS21 金属シリサイド層
P1g,P1s,P2a,P2g,P2ga,P2gb,P2s,P2s1,P2s2,P2sa,P2sb,P11g,P11s1,P11s2,P21g,P21s1,P21s2,P31g,P31s プラグ
PG プラグ
SB 半導体基板
SD,SD11,SD21 n+型半導体領域
SM,SM1,SM21 半導体層
SR スクライブ領域
ST 素子分離領域
ST1 素子分離溝
SW1,SW2 サイドウォールスペーサ
Claims (12)
- (a)第1領域および第2領域を含む主面を有し、かつ、半導体基板と前記半導体基板上の絶縁層と前記絶縁層上の半導体層との積層構造を有するSOI(Silicon On Insulator)基板を準備する工程、
(b)前記(a)工程後、前記SOI基板の前記半導体層および前記絶縁層を貫通して前記半導体基板に達する溝に埋め込まれた素子分離領域を形成する工程、
(c)前記(b)工程後、前記第1領域の前記半導体層に、ある回路を構成する第1MISFETを形成し、前記第2領域の前記半導体層に、VC(Voltage contrast)検査用のTEG(Test Elemental Group)を構成する第2MISFETを形成する工程、
(d)前記SOI基板の前記主面上に、前記第1MISFETおよび前記第2MISFETを覆うように、第1層間絶縁膜を形成する工程、
(e)前記第1領域に位置する前記第1層間絶縁膜に複数の第1コンタクトホールを形成し、前記第2領域に位置する前記第1層間絶縁膜に複数の第2コンタクトホールを形成する工程、
(f)前記複数の第1コンタクトホールに、前記回路を構成する複数の第1コンタクトプラグをそれぞれ形成し、前記複数の第2コンタクトホールに、前記TEGを構成する複数の第2コンタクトプラグをそれぞれ形成する工程、
を有し、
前記複数の第2コンタクトプラグは、前記第2領域に位置する前記半導体層と、前記第2領域に位置する前記半導体基板との両方に電気的に接続された第3コンタクトプラグを含み、
前記第3コンタクトプラグは、前記半導体基板に到達し、
前記第3コンタクトプラグは、平面視において、前記半導体層と前記半導体層の周囲を囲む前記素子分離領域との境界に形成される、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
(g)前記(f)工程後、VC検査を行う工程、
を更に有する、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記複数の第2コンタクトプラグは、前記第2領域の前記半導体層上に形成されて前記第2領域の前記半導体層に電気的に接続された第4コンタクトプラグを含み、
前記第4コンタクトプラグは前記半導体基板に到達していない、半導体装置の製造方法。 - 請求項3記載の半導体装置の製造方法において、
前記複数の第2コンタクトホールのうち、前記第3コンタクトプラグが埋め込まれている前記第2コンタクトホールの平面寸法は、前記第4コンタクトプラグが埋め込まれている前記第2コンタクトホールの平面寸法よりも大きい、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記複数の第2コンタクトホールは、前記第2領域の前記半導体層と前記半導体基板とを露出する第3コンタクトホールを含み、前記第3コンタクトプラグは前記第3コンタクトホールに埋め込まれている、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
平面視において周囲を前記素子分離領域で囲まれた前記半導体層の四隅に、それぞれ前記第3コンタクトプラグが形成される、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
平面視において周囲を前記素子分離領域で囲まれた前記半導体層の四辺に、それぞれ前記第3コンタクトプラグが形成される、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記複数の第1コンタクトプラグは、前記第1領域の前記半導体層と電気的に接続された第5コンタクトプラグを含み、かつ、前記第1領域の前記半導体層と前記半導体基板との両方に電気的に接続されたコンタクトプラグは含まない、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記第2領域は、前記SOI基板のスクライブ領域に含まれる、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記第1領域は、前記SOI基板のチップ領域に含まれる、半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記(f)工程後、
(f1)前記第1層間絶縁膜上に、第1配線層を形成する工程、
(f2)前記第1配線層上に、第2配線層を形成する工程、
を更に有し、
前記(c)工程では、前記第2領域の前記半導体層上に、前記TEGを構成するダミーの第3MISFETが形成され、
前記第2MISFETは、第1ゲート電極を含み、
前記第3MISFETは、第2ゲート電極を含み、
前記複数の第2コンタクトプラグは、前記第1ゲート電極に電気的に接続された第1のゲート用プラグと、前記第2ゲート電極に電気的に接続された第2のゲート用プラグとを含み、
前記第1配線層は、前記第1のゲート用プラグに電気的に接続された第1のゲート配線と、前記第2のゲート用プラグに電気的に接続された第2のゲート配線とを含み、
前記第1のゲート配線と前記第2のゲート配線とは、互いに分離されており、
前記第2配線層に含まれる第3のゲート配線を介して、前記第1のゲート配線と前記第2のゲート配線とが電気的に接続される、半導体装置の製造方法。 - 請求項11記載の半導体装置の製造方法において、
(g)前記(f2)工程後、前記第2配線層を除去した状態で、VC検査を行う工程、
を更に有する、半導体装置の製造方法。
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