JPWO2016163045A1 - Sgtを有する柱状半導体装置と、その製造方法 - Google Patents
Sgtを有する柱状半導体装置と、その製造方法 Download PDFInfo
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- JPWO2016163045A1 JPWO2016163045A1 JP2017511450A JP2017511450A JPWO2016163045A1 JP WO2016163045 A1 JPWO2016163045 A1 JP WO2016163045A1 JP 2017511450 A JP2017511450 A JP 2017511450A JP 2017511450 A JP2017511450 A JP 2017511450A JP WO2016163045 A1 JPWO2016163045 A1 JP WO2016163045A1
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- Prior art keywords
- layer
- contact hole
- conductor layer
- wiring conductor
- sgt
- Prior art date
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Abstract
Description
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成されたソースとして機能する第1の不純物領域と、前記半導体柱内に形成されたドレインとして機能する第2の不純物領域と、を有する1個または複数個のSGT(Surrounding Gate Transistor)と、
それぞれが前記SGTのいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なっている、第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層と、
前記第1の配線導体層に底部が接し、前記第2の配線導体層に側面が接している、管状絶縁膜と、
前記管状絶縁膜の内部に形成され、前記第1の配線導体層に接続されている引き出し導体層と、を備える、
ことを特徴とする。
前記別の管状絶縁膜の内部に形成され、前記引き出し導体層の上表面と、前記第2の配線導体層の前記最上層の上表面とに、接続されている別の引き出し導体層と、
をさらに備える、
ことが好ましい。
ことが好ましい。
ことを特徴とするが好ましい。
ことが好ましい。
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成された第1の不純物領域と、前記半導体柱内に形成された第2の不純物領域と、を有する1個または複数個の半導体構造体、並びに、
それぞれが前記半導体構造体のいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なった第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層
を含む積層構造体を提供する積層構造体提供工程と、
前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接するコンタクトホールを形成するコンタクトホール形成工程と、
前記第1の配線導体層の露出面を除いて、前記コンタクトホールに面した前記積層構造体の側面に管状絶縁膜を形成する管状絶縁膜形成工程と、
前記コンタクトホール内に、前記第1の配線導体層の前記露出面に接続されている引き出し導体層を形成する引き出し導体層形成工程と、
を備える、
ことを特徴とする。
前記管状絶縁膜形成工程において、前記管状絶縁膜は、前記第2の配線導体層の前記最上層の露出面を除いて、前記別のコンタクトホールに面した前記積層構造体の側面に別の管状絶縁膜をさらに形成し、
前記引き出し導体層形成工程において、前記別のコンタクトホール内に、前記第2の配線導体層の前記最上層の前記露出面及び前記管状絶縁膜に接続されている別の引き出し導体層をさらに形成する、
ことが好ましい。
前記別のコンタクトホールは、平面視において、前記コンタクトホールの全体または一部を囲んで形成される、
ことが好ましい。
前記積層構造体上に、孔を有するマスク材料層を形成するマスク材料層形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第2の配線導体層の前記最上層の上表面又は内部まで続く前記別のコンタクトホールを形成し、その後、前記積層構造体を等方エッチングして、平面視における前記別のコンタクトホールの幅を前記孔より大きくする、上部コンタクトホール形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接する前記コンタクトホールを形成する下部コンタクトホール形成工程と、
前記マスク材料層を除去するマスク材料層除去工程と、を含む
ことが好ましい。
ことが好ましい。
ことが好ましい。
以下、図1A、図1B、図2A〜図2Sを参照しながら、本発明の第1実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。
Si柱SP1には、図1AにおけるPチャネルSGT_Pc1が上部に形成され、PチャネルSGT_Pc2が下部に形成されている。PチャネルSGT_Pc1、Pc2はSi柱SP1の中間にあるSiO2層Ox1で分離されている。そして、PチャネルSGT_Pc1は、チャネルであるSi柱SP1の一部と、このSi柱SP1の一部を囲むゲートGp1、ゲートGp1の上下のSi柱SP1内にあるドレインP+層Pd1とソースP+層Ps1より形成されている。そして、PチャネルSGT_Pc2は、チャネルであるSi柱SP1の一部、このSi柱SP1の一部を囲むゲートGp2、ゲートGp2の上下のSi柱SP1内にあるドレインP+層Pd2とソースP+層Ps2より形成されている。
Si柱SP2には、図1AにおけるNチャネルSGT_Nc1が上部に形成され、NチャネルSGT_Nc2が下部に形成されている。NチャネルSGT_Nc1、Nc2はSi柱SP2の中間にあるSiO2層Ox2で分離されている。そして、NチャネルSGT_Nc1は、チャネルであるSi柱SP2の一部、このSi柱SP2の一部を囲むゲートGn1、ゲートGn1の上下のSi柱SP2内にあるドレインN+層Nd1とソースN+層Ns1より形成されている。そして、NチャネルSGT_Nc2は、チャネルであるSi柱SP2の一部、このSi柱SP2の一部を囲むゲートGn2、ゲートGn2の上下のSi柱SP2内にあるドレインN+層Nd2とソースN+層Ns2より形成されている。
Si柱SP3には、図1AにおけるNチャネルSGT_SN1が上部に形成され、NチャネルSGT_SN2が下部に形成されている。NチャネルSGT_SN1、SN2はSi柱SP3の中間にあるSiO2層Ox3で分離されている。そして、NチャネルSGT_SN1は、チャネルであるSi柱SP3の一部、このSi柱SP3の一部を囲むゲートGs1、ゲートGs1の上下のSi柱SP3内にあるドレインN+層Sd1とソースN+層Ss1より形成されている。そして、NチャネルSGT_SN2は、チャネルであるSi柱SP3の一部、このSi柱SP3の一部を囲むゲートGs2、ゲートGs2の上下のSi柱SP3内にあるドレインN+層Sd2とソースN+層Ss2より形成されている。
次に、リソグラフィ法とRIE法を用いて、下層に残存するi層2をエッチングして、Si柱6aの外周部にi層2a1を、Si柱6bの外周部にi層2a2を、Si柱6cの外周部にi層2a3を形成する。
また、Si柱6bの上部に、N+層38b、33bをソース、ドレインとし、TiN層18dをゲートとし、N+層38b、33b間のSi柱6bをチャネルにしたSGT(図1BのNチャネル型SGT_Nc1に対応する)が形成され、Si柱6bの下部に、N+層8bb、31bをソース、ドレインとし、TiN層18aをゲートとし、N+層8bb、31b間のSi柱6aをチャネルにしたSGT(図1BのNチャネル型SGT_Nc2に対応する)が、形成される。
また、Si柱6cの上部に、N+層38c、33cをソース、ドレインとし、TiN層18eをゲートとし、N+層38c、33c間のSi柱6cをチャネルにしたSGT(図1BのNチャネル型SGT_SN1に対応する)が形成され、Si柱6cの下部に、N+層8cc、31cをソース、ドレインとし、TiN層18bをゲートとし、N+層8cc、31c間のSi柱6cをチャネルにしたSGT(図1BのNチャネル型SGT_Nc2に対応する)が、形成される。
これらSGT(図1BのSGT_Pc1、Pc2、Nc1、Nc2、SN1、SN2に対応する)が接続配線されて、図1Bに示した模式構造図と同じく、Si柱6a、6b、6cの上部に形成されたPチャネル型SGT(図1BのPチャネル型SGT_Pc1に対応する)及びNチャネル型SGT(図1BのNチャネル型SGT_Nc1、SN1に対応する)による回路領域(図1Bの回路領域C1に対応する)と、Si柱6a、6b、6cの下部に形成されたPチャネル型SGT(図1BのPチャネル型SGT_Pc2に対応する)及びNチャネル型SGT(図1BのNチャネル型SGT_Nc2、SN2に対応する)による回路領域(図1Bの回路領域C2に対応する)と、により構成されたSRAMセル回路が形成される。
1.コンタクトホール40aに面したNiSi層28bbの側面にSiO2層41aが形成されている。これにより、平面視において、NiSi層28aa、28bb、36aが、お互いに重なっているのにも関わらず、これらを貫通するコンタクトホール40aによって、配線金属層42bとNiSi層28bbとを絶縁しつつ、NiSi層28aaとNiSi層36aとを接続することが可能となる。これは、SRAMセル面積の縮小を可能にする。
同様に、コンタクトホール40bに面したNiSi層28aaの側面にSiO2層41cが形成されている。これにより、平面視において、TiN層18a、NiSi層28aa、28bbが、お互いに重なっているのにも関わらず、これらを貫通するコンタクトホール40bによって、配線金属層42dとNiSi層28aaを絶縁しつつ、TiN層18aとNiSi層28bbとを接続することが可能となる。これは、SRAMセル面積の縮小を可能にする。
2.平面視において互いに重なった、下部配線導体層であるNiSi層28aa、中間配線導体層であるNiSi層28bb、上部配線導体層であるNiSi層36aを有する構造において、NiSi層28aa上に、NiSi層28bb、36aを貫通したコンタクトホール40aと、平面視においてコンタクトホール40aの外側を囲み、且つNiSi層36a上に配置されたコンタクトホール40cが形成されている。そして、コンタクトホール40aの内側側面に形成したSiO2層41aにより配線金属層42bとNiSi層28bbとは絶縁され、NiSi層28aaの上面とNiSi層36aの上面とは配線金属層42aに接続されている。これにより、NiSi層28aaとNiSi層36aとの高密度配線が実現する。
同様に、平面視において互いに重なった、下部配線導体層であるTiN層18a、中間配線導体層であるNiSi層28aa、上部配線導体層であるNiSi層28bbを有する構造において、TiN層18a上に、NiSi層28aa、28bbを貫通したコンタクトホール40bと、平面視においてコンタクトホール40bの外側を囲み、且つNiSi層28bb上に配置されたコンタクトホール40dが形成されている。コンタクトホール40bの内側側面に形成したSiO2層41cにより配線金属層42aとNiSi層28aaは絶縁され、TiN層18aの上面とNiSi層28bbの上面とは配線金属層42aに接続されている。これにより、TiN層18aとNiSi層28bbとの高密度配線が実現する。
これにより、平面視で見ると、本実施形態のSRAMセル回路領域は、3つのSi柱6a、6b、6cと、9個のコンタクトホール40c(コンタクトホール40aが重なって形成されている)、40d(コンタクトホール40bが重なって形成されている)、45a、45b、45c、45d、47、49a、49bと、により構成されている。通常、1つの半導体柱に1つのSGTを形成する場合、ソース、ドレイン、ゲートの、少なくとも3個の配線金属層へのコンタクト(コンタクトホールを介した接続)が必要である。これに対して、本実施形態では、1つの半導体柱(Si柱)において2個のSGTを形成しているにも係わらず、1つの半導体柱当たり3個のコンタクトでSRAMセル回路が形成される。これにより、高密度なSGTを有したSRAMセル回路が実現できる。このように、SGTのような柱状半導体を用いた回路においては、ソース、ドレイン、そしてゲートなどのノード(node)に繋がる配線導体層が、平面視において重なって形成され、かつ接続すべき配線導体層の間に、絶縁しなければいけない配線導体層がある場合において、本実施形態に示した配線導体層間接続は回路の高密度化に繋がる。
以下、図3A〜図3Eを参照しながら、本発明の第2実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。(a)は平面図、(b)は(a)のX−X’線に沿う断面構造図、(c)は(a)のY1−Y1’線に沿う断面構造図、(d)は(a)のY2−Y2’線に沿う断面構造図、(e)は(a)のY3−Y3’線に沿った断面構造図である。第2実施形態の製造方法は、以下に説明する相違点を除き、第1実施形態の図2A〜図2Sに示す工程と同様である。
本実施形態では、コンタクトホール58aとコンタクトホール59aが、同じレジスト層54をエッチングマスクとして、自己整合で形成されている。同様に、コンタクトホール58bとコンタクトホール59bが、同じレジスト層54をエッチングマスクとして、自己整合で形成されている。これにより、SRAMセル回路の高集積化が図れる。
以下、図4A〜図4Cを参照しながら、本発明の第3実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。(a)は平面図、(b)は(a)のX−X’線に沿う断面構造図、(c)は(a)のY1−Y1’線に沿う断面構造図、(d)は(a)のY2−Y2’線に沿う断面構造図、(e)は(a)のY3−Y3’線に沿った断面構造図である。第3実施形態の製造方法は、以下に説明する相違点を除き、第1実施形態の図2A〜図2Sに示す工程と同様である。
半導体装置の高密度化は、リソグラフィ法によりパターン加工される材料層の平面視形状の微細化によりおこなわれる。この場合、リソグラフィ法によりパターン加工される材料層の平面視形状は矩形、または正方形が望ましい。本実地形態では、平面視において、第1実施形態ではL字形状であったTiN層12aが、矩形のTiN層63aになる。同様に、平面視において、第1実施形態では逆L字形状であったNiSi層36aが、矩形のNiSi層64aになる。これにより、リソグラフィ法によりパターン加工される全ての材料層の平面視形状は矩形または正方形になる。これによって、SRAMセル回路の高密度化が図れる。
以下、図5A〜図5Eを参照しながら、本発明の第4実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。(a)は平面図、(b)は(a)のX−X’線に沿う断面構造図、(c)は(a)のY1−Y1’線に沿う断面構造図、(d)は(a)のY2−Y2’線に沿う断面構造図、(e)は(a)のY3−Y3’線に沿った断面構造図である。第4実施形態の製造方法は、以下に説明する相違点を除き、第1実施形態の図2A〜図2Sに示す工程と同様である。
1.コンタクトホール73aの内部に面したNiSi層28aaの側面に被覆されたSiO2層77aは、RIEエッチングされないで残存されるので、配線金属層42bとNiSi層28aaとの絶縁が確実に行われる。同様に、コンタクトホール73bの内部に面したCoSi層70aの側面に被覆されたSiO2層77bは、RIEエッチングされないで残存されるので、配線金属層42aとCoSi層70aとの絶縁が確実に行われる。
2.NiSi層28aaの側面に被覆されたSiO2層77aの厚さが、第1実施形態におけるSiO2層41aの厚さと比べて、厚くなるので、TiN層72a、CoSi層70aに繋がった配線金属層42bと、NiSi層28aaとの間のカップリング容量を小さくできる。同様に、CoSi層70aの側面に被覆されたSiO2層77bの厚さが、第1実施形態におけるSiO2層41cの厚さと比べて、厚くなるので、TiN層18a、NiSi層28bbに繋がった配線金属層42bと、CoSi層70aとの間のカップリング容量を小さくできる。
以下、図6A、図6Bを参照しながら、本発明の第5実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。(a)は平面図、(b)は(a)のX−X’線に沿う断面構造図、(c)は(a)のY1−Y1’線に沿う断面構造図、(d)は(a)のY2−Y2’線に沿う断面構造図、(e)は(a)のY3−Y3’線に沿った断面構造図である。第5実施形態の製造方法は、以下に説明する相違点を除き、第1実施形態の図2A〜図2Sに示す工程と同様である。
図6B(d)に示すように、接続する上部配線導体層であるNiSi層36bと、下部配線導体層であるTiN層18bとの間を貫通するコンタクトホール83aは、接続するNiSi層36bと、TiN層18bとの間にある中間配線導体層である2つのNiSi層80a、80bを貫通している。そして、NiSi層36bと、TiN層18bと接続したワード線配線金属層WLは、SiO2層82bにより、NiSi層80a、80bと絶縁されている。
同様に、図6B(e)に示すように、P+層38aに繋がった上部配線導体層である電源配線金属層VDDと下部配線導体層であるP+層8aaを繋ぐコンタクトホール45cが、絶縁された中間配線導体層である2つのNiSi層80a、80bを貫通している。
第1実施形態によれば、2つの接続する上部配線導体層と下部配線導体層とを繋ぐコンタクトホールが、絶縁された1つの中間配線導体層を貫通するのに対して、本実施形態では、接続する上部配線導体層と下部配線導体層を繋ぐコンタクトホールが、絶縁された2つの中間配線導体層を貫通している。これによって、回路設計に自由度が大きくできるので、更に高密度の回路設計が可能になる。
また、接続する上部配線導体層と下部配線導体層を繋ぐコンタクトホールが、絶縁された2つ以上の中間配線導体層を貫通しても、本発明を適用できる。
以下、図7を参照しながら、本発明の第6実施形態に係る、SGTを有する柱状半導体装置の製造方法について説明する。(a)は平面図、(b)は(a)のX−X’線に沿う断面構造図、(c)は(a)のY1−Y1’線に沿う断面構造図、(d)は(a)のY2−Y2’線に沿う断面構造図、(e)は(a)のY3−Y3’線に沿った断面構造図である。第6実施形態の製造方法は、以下に説明する相違点を除き、第1実施形態の図2A〜図2Sに示す工程と同様である。
同様に、NiSi層28Bは、平面視において、NiSi層28Bの側面がコンタクトホール40B(図2Sでのコンタクトホール40bに対応)の形成予定部分と接して又は横切って形成されている。そして、NiSi層28Bは、平面視において、NiSi層28Bの側面がコンタクトホール40D(図2Sのコンタクトホール40dに対応)の形成予定部分を横切って形成されている。この結果、図7に示すように、平面視において、NiSi層28Bはコンタクトホール40Bの外周の少なくとも一部と接し、NiSi層28Bはコンタクトホール40Dと少なくとも一部が重なる。さらに、本実施形態では、図7に示すように、コンタクトホール40B、40Dの内側面にSiO2層41C、41D(図2SのSiO2層41c、41dに対応)が形成され、コンタクトホール40B、40Dを介して、配線金属層42A(図2Sの配線金属層42aに対応)により、TiN層18aとNiSi層28Bが接続されている。
これにより、コンタクトホール40AとNiSi層28B、36Aとのマスク合せ余裕寸法、及びコンタクトホール40BとNiSi層28Bとのマスク合せ余裕寸法とを大きくできる。これはSRAMセル面積の縮小に繋がる。
また、第1実施形態においては、平面視において、NiSi層36a、28aがコンタクトホール40c、40dの全体と重なって形成されている。一方、本実施形態では、平面視において、NiSi層36A、28Bがコンタクトホール40C、40Dの少なくとも一部と重なって形成されている。
これにより、コンタクトホール40C、40DとNiSi層36A、28Bとのマスク合せ余裕寸法を大きくできる。これはSRAMセル面積の縮小に繋がる。
Nc1、Nc2、Nc3、Nc4、SN1、SN2 NチャネルSGT
BLt ビット線端子
BLRt 反転ビット線端子
WLt ワード線端子
Vss グランド端子
Vdd 電源端子
C1、C2 回路領域
Gp1、Gp2、Gn1、Gn2、Gs1、Gs2 ゲート
1 SiO2層基板
2、2a1、2a2、2a3、2b1、2b2、2b3、4、4a、4b、4c i層
Ns1、Ns2、Nd1、Nd2、Sd1、Sd2、NS1、ND、SS1、SD1、SD2、SS2、8b、8c、8bb、8cc、31b、31c、32b、32c、33b、33c、38b、38c N+層
8a、8aa、38a、31a、32a、33a P+層
Ox1、Ox2、Ox3、3、3a、3b、3c、5、5a、5b、5c、7a、7b、7c、10、14、14a、14b、14c、14d、23a、23b、23aa、23bb、23B、37、39、41a、41b、41c、41d、41A、41B、41C、41D、44、46、48、51a、60a、60b、61a、61b、77a、77b、81a、81b、82a、82b、82c SiO2層
SP1、SP2、SP3、6a、6b、6c Si柱
11、11a、11b、11c、11d HfO2層
12、12a、12b、18a、18b、18c、18d、18e、63a、63b、72a、72a、72b TiN層
15、35、52、53 SiN層
16、27、54、75a、75b レジスト層
20a、20b、20c、20d、20e、20f TiO層
21a、21b Ni層
22a、22b P型ポリSi層
26a、26b N+型ポリSi層
25a、25b、25c 空間
28a、28b、28aa、28bb、28B、30a、30b、30c、32a、32b、32c、36a、36b、36A、64a、64b、80a、80b NiSi層
70a、71a、71b、71c CoSi層
40a、40b、40c、40d、40A、40B、40C、40D、45a、45b、45c、45d、47、49a、49b、56a、56b、58a、58b、59a、59b、73a、73b、83a、83b コンタクトホール
42a、42b、42A、42B 配線金属層
VDD 電源配線金属層
VSS グランド配線金属層
WL ワード線配線金属層
BL ビット線配線金属層
BLR 反転ビット線配線金属層
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成されたソースとして機能する第1の不純物領域と、前記半導体柱内に形成されたドレインとして機能する第2の不純物領域と、を有する1個または複数個のSGT(Surrounding Gate Transistor)と、
それぞれが前記SGTのいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なっている、第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層と、
前記第1の配線導体層と前記第2の配線導体層との間に存在する層間絶縁層と、
前記第1の配線導体層に底部が接し、前記第2の配線導体層及び前記層間絶縁層に側面が接している、管状絶縁膜と、
前記管状絶縁膜の内部を充填して形成され、前記第1の配線導体層に接続されている引き出し導体層と、を備える、
ことを特徴とする。
前記第3の配線導体層の最上層に底部が接する別の管状絶縁膜と、
前記別の管状絶縁膜の内部に形成され、前記引き出し導体層の上表面と、前記第3の配線導体層の前記最上層の上表面とに、接続されている別の引き出し導体層と、
をさらに備える、
ことが好ましい。
ことが好ましい。
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成された第1の不純物領域と、前記半導体柱内に形成された第2の不純物領域と、を有する1個または複数個の半導体構造体、
それぞれが前記半導体構造体のいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なった第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層、並びに、
前記第1の配線導体層と前記第2の配線導体層との間に存在する層間絶縁層
を含む積層構造体を提供する積層構造体提供工程と、
前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接し、且つ、前記層間絶縁層を貫通する又は前記層間絶縁層に接するコンタクトホールを形成するコンタクトホール形成工程と、
前記第1の配線導体層の露出面を除いて、前記コンタクトホールに面した前記積層構造体の側面に管状絶縁膜を形成する管状絶縁膜形成工程と、
前記コンタクトホール内に、前記第1の配線導体層の前記露出面に接続され、且つ、前記コンタクトホール内を充填している引き出し導体層を形成する引き出し導体層形成工程と、
を備える、
ことを特徴とする。
前記コンタクトホール形成工程において、前記コンタクトホールの形成の前後のいずれかで、前記第3の配線導体層の最上層の上表面又は内部まで別のコンタクトホールをさらに形成し、
前記管状絶縁膜形成工程において、前記管状絶縁膜は、前記第3の配線導体層の前記最上層の露出面を除いて、前記別のコンタクトホールに面した前記積層構造体の側面に別の管状絶縁膜をさらに形成し、
前記引き出し導体層形成工程において、前記別のコンタクトホール内に、前記第3の配線導体層の前記最上層の前記露出面及び前記管状絶縁膜に接続されている別の引き出し導体層をさらに形成する、
ことが好ましい。
前記積層構造体上に、孔を有するマスク材料層を形成するマスク材料層形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第3の配線導体層の前記最上層の上表面又は内部まで続く前記別のコンタクトホールを形成し、その後、前記積層構造体を等方エッチングして、平面視における前記別のコンタクトホールの幅を前記孔より大きくする、上部コンタクトホール形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接する前記コンタクトホールを形成する下部コンタクトホール形成工程と、
前記マスク材料層を除去するマスク材料層除去工程と、を含む、
ことが好ましい。
[付記]
[付記1]
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成されたソースとして機能する第1の不純物領域と、前記半導体柱内に形成されたドレインとして機能する第2の不純物領域と、を有する1個または複数個のSGT(Surrounding Gate Transistor)と、
それぞれが前記SGTのいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なっている、第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層と、
前記第1の配線導体層に底部が接し、前記第2の配線導体層に側面が接している、管状絶縁膜と、
前記管状絶縁膜の内部に形成され、前記第1の配線導体層に接続されている引き出し導体層と、を備える、
ことを特徴とするSGTを有する柱状半導体装置。
[付記2]
前記第2の配線導体層の最上層に底部が接する別の管状絶縁膜と、
前記別の管状絶縁膜の内部に形成され、前記引き出し導体層の上表面と、前記第2の配線導体層の前記最上層の上表面とに、接続されている別の引き出し導体層と、
をさらに備える、
ことを特徴とする付記1に記載のSGTを有する柱状半導体装置。
[付記3]
平面視において、前記別の引き出し導体層は前記引き出し導体層を囲んでいる、
ことを特徴とする付記2に記載のSGTを有する柱状半導体装置。
[付記4]
平面視において、前記第2の配線導体層のうち少なくとも1つが前記引き出し導体層の全周を囲んでいる、
ことを特徴とする付記2に記載のSGTを有する柱状半導体装置。
[付記5]
平面視において、前記管状絶縁膜は前記第2の配線導体層のうち少なくとも1つに面して外周方向に広がる拡張部を有する、
ことを特徴とする付記1に記載のSGTを有する柱状半導体装置。
[付記6]
基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成された第1の不純物領域と、前記半導体柱内に形成された第2の不純物領域と、を有する1個または複数個の半導体構造体、並びに、
それぞれが前記半導体構造体のいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なった第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層
を含む積層構造体を提供する積層構造体提供工程と、
前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接するコンタクトホールを形成するコンタクトホール形成工程と、
前記第1の配線導体層の露出面を除いて、前記コンタクトホールに面した前記積層構造体の側面に管状絶縁膜を形成する管状絶縁膜形成工程と、
前記コンタクトホール内に、前記第1の配線導体層の前記露出面に接続されている引き出し導体層を形成する引き出し導体層形成工程と、
を備える、
ことを特徴とするSGTを有する柱状半導体装置の製造方法。
[付記7]
前記コンタクトホール形成工程において、前記コンタクトホールの形成の前後のいずれかで、前記第2の配線導体層の最上層の上表面又は内部まで別のコンタクトホールをさらに形成し、
前記管状絶縁膜形成工程において、前記管状絶縁膜は、前記第2の配線導体層の前記最上層の露出面を除いて、前記別のコンタクトホールに面した前記積層構造体の側面に別の管状絶縁膜をさらに形成し、
前記引き出し導体層形成工程において、前記別のコンタクトホール内に、前記第2の配線導体層の前記最上層の前記露出面及び前記管状絶縁膜に接続されている別の引き出し導体層をさらに形成する、
ことを特徴とする付記6に記載のSGTを有する柱状半導体装置の製造方法。
[付記8]
前記コンタクトホール形成工程において、前記コンタクトホールを形成した後に前記別のコンタクトホールを形成し、
前記別のコンタクトホールは、平面視において、前記コンタクトホールの全体または一部を囲んで形成される、
ことを特徴とする付記7に記載のSGTを有する柱状半導体装置の製造方法。
[付記9]
前記コンタクトホール形成工程は、
前記積層構造体上に、孔を有するマスク材料層を形成するマスク材料層形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第2の配線導体層の前記最上層の上表面又は内部まで続く前記別のコンタクトホールを形成し、その後、前記積層構造体を等方エッチングして、平面視における前記別のコンタクトホールの幅を前記孔より大きくする、上部コンタクトホール形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接する前記コンタクトホールを形成する下部コンタクトホール形成工程と、
前記マスク材料層を除去するマスク材料層除去工程と、を含む
ことを特徴とする付記7に記載のSGTを有する柱状半導体装置の製造方法。
[付記10]
前記管状絶縁膜形成工程では、前記コンタクトホール内に絶縁材料を充填し、その後、エッチングにより、前記コンタクトホールに面した前記積層構造体の側面に絶縁膜を残しつつ、前記第1の配線導体層の前記露出面まで充填した前記絶縁材料を除去する、
ことを特徴とする付記6に記載のSGTを有する柱状半導体装置の製造方法。
[付記11]
前記コンタクトホール形成工程後で前記管状絶縁膜形成工程より前に、前記第2の配線導体層のうち少なくとも1つの、前記コンタクトホールに面した側面を、平面視において、前記コンタクトホールより外側にエッチングして、該第2の配線導体層により囲まれた前記コンタクトホールの一部を拡張するコンタクトホール拡張工程をさらに備える、
ことを特徴とする付記6に記載のSGTを有する柱状半導体装置の製造方法。
Claims (11)
- 基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成されたソースとして機能する第1の不純物領域と、前記半導体柱内に形成されたドレインとして機能する第2の不純物領域と、を有する1個または複数個のSGT(Surrounding Gate Transistor)と、
それぞれが前記SGTのいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なっている、第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層と、
前記第1の配線導体層に底部が接し、前記第2の配線導体層に側面が接している、管状絶縁膜と、
前記管状絶縁膜の内部に形成され、前記第1の配線導体層に接続されている引き出し導体層と、を備える、
ことを特徴とするSGTを有する柱状半導体装置。 - 前記第2の配線導体層の最上層に底部が接する別の管状絶縁膜と、
前記別の管状絶縁膜の内部に形成され、前記引き出し導体層の上表面と、前記第2の配線導体層の前記最上層の上表面とに、接続されている別の引き出し導体層と、
をさらに備える、
ことを特徴とする請求項1に記載のSGTを有する柱状半導体装置。 - 平面視において、前記別の引き出し導体層は前記引き出し導体層を囲んでいる、
ことを特徴とする請求項2に記載のSGTを有する柱状半導体装置。 - 平面視において、前記第2の配線導体層のうち少なくとも1つが前記引き出し導体層の全周を囲んでいる、
ことを特徴とする請求項2に記載のSGTを有する柱状半導体装置。 - 平面視において、前記管状絶縁膜は前記第2の配線導体層のうち少なくとも1つに面して外周方向に広がる拡張部を有する、
ことを特徴とする請求項1に記載のSGTを有する柱状半導体装置。 - 基板上に前記基板平面に垂直に形成された半導体柱と、前記半導体柱の外周を囲んで形成されたゲート絶縁層と、前記ゲート絶縁層を囲んで形成されたゲート導体層と、前記半導体柱内に形成された第1の不純物領域と、前記半導体柱内に形成された第2の不純物領域と、を有する1個または複数個の半導体構造体、並びに、
それぞれが前記半導体構造体のいずれかの前記ゲート導体層、前記第1の不純物領域、又は前記第2の不純物領域に接続され、前記基板平面に水平に延在し、且つ平面視において互いに少なくとも部分的に重なった第1の配線導体層及び前記第1の配線導体層の上方に存在する少なくとも1つの第2の配線導体層
を含む積層構造体を提供する積層構造体提供工程と、
前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接するコンタクトホールを形成するコンタクトホール形成工程と、
前記第1の配線導体層の露出面を除いて、前記コンタクトホールに面した前記積層構造体の側面に管状絶縁膜を形成する管状絶縁膜形成工程と、
前記コンタクトホール内に、前記第1の配線導体層の前記露出面に接続されている引き出し導体層を形成する引き出し導体層形成工程と、
を備える、
ことを特徴とするSGTを有する柱状半導体装置の製造方法。 - 前記コンタクトホール形成工程において、前記コンタクトホールの形成の前後のいずれかで、前記第2の配線導体層の最上層の上表面又は内部まで別のコンタクトホールをさらに形成し、
前記管状絶縁膜形成工程において、前記管状絶縁膜は、前記第2の配線導体層の前記最上層の露出面を除いて、前記別のコンタクトホールに面した前記積層構造体の側面に別の管状絶縁膜をさらに形成し、
前記引き出し導体層形成工程において、前記別のコンタクトホール内に、前記第2の配線導体層の前記最上層の前記露出面及び前記管状絶縁膜に接続されている別の引き出し導体層をさらに形成する、
ことを特徴とする請求項6に記載のSGTを有する柱状半導体装置の製造方法。 - 前記コンタクトホール形成工程において、前記コンタクトホールを形成した後に前記別のコンタクトホールを形成し、
前記別のコンタクトホールは、平面視において、前記コンタクトホールの全体または一部を囲んで形成される、
ことを特徴とする請求項7に記載のSGTを有する柱状半導体装置の製造方法。 - 前記コンタクトホール形成工程は、
前記積層構造体上に、孔を有するマスク材料層を形成するマスク材料層形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第2の配線導体層の前記最上層の上表面又は内部まで続く前記別のコンタクトホールを形成し、その後、前記積層構造体を等方エッチングして、平面視における前記別のコンタクトホールの幅を前記孔より大きくする、上部コンタクトホール形成工程と、
前記マスク材料層をマスクに前記積層構造体を垂直方向にエッチングして、前記第1の配線導体層の上表面又は内部まで、前記第2の配線導体層を貫通する又は前記第2の配線導体層に接する前記コンタクトホールを形成する下部コンタクトホール形成工程と、
前記マスク材料層を除去するマスク材料層除去工程と、を含む
ことを特徴とする請求項7に記載のSGTを有する柱状半導体装置の製造方法。 - 前記管状絶縁膜形成工程では、前記コンタクトホール内に絶縁材料を充填し、その後、エッチングにより、前記コンタクトホールに面した前記積層構造体の側面に絶縁膜を残しつつ、前記第1の配線導体層の前記露出面まで充填した前記絶縁材料を除去する、
ことを特徴とする請求項6に記載のSGTを有する柱状半導体装置の製造方法。 - 前記コンタクトホール形成工程後で前記管状絶縁膜形成工程より前に、前記第2の配線導体層のうち少なくとも1つの、前記コンタクトホールに面した側面を、平面視において、前記コンタクトホールより外側にエッチングして、該第2の配線導体層により囲まれた前記コンタクトホールの一部を拡張するコンタクトホール拡張工程をさらに備える、
ことを特徴とする請求項6に記載のSGTを有する柱状半導体装置の製造方法。
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