JP5435315B2 - 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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- JP5435315B2 JP5435315B2 JP2012227740A JP2012227740A JP5435315B2 JP 5435315 B2 JP5435315 B2 JP 5435315B2 JP 2012227740 A JP2012227740 A JP 2012227740A JP 2012227740 A JP2012227740 A JP 2012227740A JP 5435315 B2 JP5435315 B2 JP 5435315B2
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Description
チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、前記チャンネル領域と前記ゲート絶縁膜との界面の平坦度を、前記ソース領域から前記ドレイン領域に向かう方向での長さ2nmにおけるピーク・トゥ・バレイ値が0.3nm以下となるようにするとともに、前記第1の電極から前記チャンネル領域までの抵抗率を4Ω・μm以下としたことを特徴とする半導体装置の製造方法。
チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、前記チャンネル領域と前記ゲート絶縁膜との界面を原子レベルで平坦にし、かつ前記第1の電極のうち、前記ソース領域又は前記ドレイン領域に接続する部分を金属シリサイドとし、該金属シリサイドと該金属シリサイドが接続するソース領域又はドレイン領域との仕事関数の差が0.32eV程度以下となるように前記金属シリサイドを構成する金属を選ぶことを特徴とする半導体装置の製造方法。
チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、前記チャンネル領域と前記ゲート絶縁膜との界面の平坦度を、前記ソース領域から前記ドレイン領域に向かう方向での長さ2nmにおけるピーク・トゥ・バレイ値が0.3nm以下となるようにするとともに、前記第1の電極のうち、前記ソース領域又は前記ドレイン領域に接続する部分を金属シリサイドとし、該金属シリサイドと該金属シリサイドが接続するソース領域又はドレイン領域との仕事関数の差が0.32eV程度以下となるように前記金属シリサイドを構成する金属を選ぶことを特徴とする半導体装置の製造方法。
前記等方性酸化または窒化が、高密度プラズマを用いた酸素ラジカルまたは窒素ラジカルによる酸化または窒化であることを特徴とする第1乃至第3の態様のいずれか一つに記載の半導体装置の製造方法。
前記チャンネル領域、前記ソース領域、および前記ドレイン領域がシリコン層に設けられ、前記シリコン層の前記チャンネル領域の表面が(110)面または(110)面から±10°以内の面であることを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記チャンネル領域の表面が(551)面であることを特徴とする第5の態様に記載の半導体装置の製造方法。
前記第1の電極から前記チャンネル領域までの抵抗が、前記第1の電極と前記ソース領域及びドレイン領域の少なくとも一つとの接触部の接触抵抗及び該接触部から前記チャンネル領域までの前記ソース領域及びドレイン領域の前記少なくとも一つの内部直列抵抗を含み、前記接触抵抗を1×10−10Ωcm2以下としたことを特徴とする第1の態様に記載の半導体装置の製造方法。
前記ソース領域、ドレイン領域を、その仕事関数が前記チャンネル領域の半導体の仕事関数との差が0.32eV以下であるような金属または金属半導体化合物で構成することを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記チャンネル領域をn型シリコンで構成すると共に、前記ソース領域、ドレイン領域を、その仕事関数が−4.37eV以上であるような金属または金属シリサイドで構成することを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記チャンネル領域をp型シリコンで構成すると共に、前記ソース領域、ドレイン領域を、その仕事関数が−4.85eV以下であるような金属または金属シリサイドで構成することを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記半導体装置はノーマリオフであり、かつインバージョン型またはアキュムレーション型としたことを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記半導体装置をアキュムレーション型のトランジスタとしたことを特徴とする第1乃至第4の態様のいずれか一つに記載の半導体装置の製造方法。
前記チャンネル領域上のゲート絶縁膜が、SiO2,Si3N4及び金属シリコン合金の酸化膜、金属シリコン合金の窒化膜を少なくとも一種類、含有することを特徴とする第1乃至第3の態様のいずれか一つに記載の半導体装置の製造方法。
少なくとも一対のnチャンネルトランジスタ及びpチャンネルトランジスタを有するCMOS半導体装置の製造方法において、
前記nチャンネルトランジスタ及び前記pチャンネルトランジスタを第1乃至第6の態様のいずれか一つに記載された半導体装置の製造方法でそれぞれ構成すると共に、
前記nチャンネルトランジスタのソース・ドレイン領域とそれぞれ接する前記第1の電極の少なくとも接続部を第1の金属シリサイドで構成し、前記pチャンネルトランジスタのソース・ドレイン領域とそれぞれ接する前記第1の電極の少なくとも接続部を前記第1の金属シリサイドとは異なる第2の金属シリサイドで構成することを特徴とするCMOS半導体装置の製造方法。
前記第1の金属シリサイドをその仕事関数が−4.37eV以上になるような材料で構成し、前記第2の金属シリサイドをその仕事関数が−4.85eV以下になるような材料で構成することを特徴とする第14の態様に記載のCMOS半導体装置の製造方法。
gmi=(μeff×W)(Vg−Vth)/(L×Tox/εox) (1)
gmeff=gmi/(1+Rs・gmi) (2)
τ=CL/gmeff=CL(1+Rs・gmi)/gmi (3)
(1/μeff)=(1/μc)+(1/μp)+(1/μr) (4)
図14を参照すると、本発明の第1の実施例に係るMOSFETの具体的構成例が示されている。図14に示されたMOSFETは、nMOSFETであり、p型シリコン基板または金属基板51上に埋込絶縁層(BOX)52、BOX52上に形成されたSOI層53を有する。ここで、BOX52は厚さ10.0nmのSiO2によって形成され、他方、SOI層53は厚さ20.0nmのn+シリコン層によって形成されている。SOI層53には、3×1018cm−3の不純物濃度を有するチャンネル領域530と、チャンネル領域530の両側に形成されたチャンネル領域よりも濃度の高いソース領域531及びドレイン領域532が形成されている。チャンネル領域530は0.50μmのチャンネル長Lを有している。更に、チャンネル領域530表面には、SiO2換算膜厚(EOT)が1.0nmの窒化シリコンからなるゲート絶縁膜54が形成されるとともに、ゲート絶縁膜54上には、Taのゲート電極55が形成されている。ゲート絶縁膜54及びゲート電極55はチャンネル領域530の長さ方向において、チャンネル領域全体を覆うとともに、ソース領域531及びドレイン領域532に若干オーバーラップしている。ソース領域531及びドレイン領域532の幅は5nmであり、その両側のSOI層53上にはMgシリサイドによって形成されたソース電極561及びドレイン電極571が設けられている。ソース電極561及びドレイン電極571上にはCuからなるソース配線層56及びドレイン配線層57がそれぞれ接続されている。
次に、図15A〜図15Cを参照して、本発明の第2の実施例として、nMOSFET及びpMOSFETを含むCMOS回路を構成する半導体装置を説明する。
Wp=2H+Wn (5)
gmp(110)×Wp=gmn(100)×2H+gmp(110)×Wn (6)
Claims (15)
- チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、
酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、
前記チャンネル領域と前記ゲート絶縁膜との界面の平坦度を、前記ソース領域から前記ドレイン領域に向かう方向での長さ2nmにおけるピーク・トゥ・バレイ値が0.3nm以下となるようにするとともに、前記第1の電極から前記チャンネル領域までの抵抗率を4Ω・μm以下としたことを特徴とする半導体装置の製造方法。 - チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、
酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、
前記チャンネル領域と前記ゲート絶縁膜との界面を原子レベルで平坦にし、かつ前記第1の電極のうち、前記ソース領域又は前記ドレイン領域に接続する部分を金属シリサイドとし、該金属シリサイドと該金属シリサイドが接続するソース領域又はドレイン領域との仕事関数の差が0.32eV程度以下となるように前記金属シリサイドを構成する金属を選ぶことを特徴とする半導体装置の製造方法。 - チャンネル領域と、前記チャンネル領域の両サイドの一方に設けられたソース領域及び他方に設けられたドレイン領域と、前記ソース領域及びドレイン領域のいずれか一方に電気的に接続する一つの第1の電極又は前記ソース領域及びドレイン領域にそれぞれ電気的に接続する合計二つの第1の電極と、前記チャンネル領域上にゲート絶縁膜を介して設けられた第2の電極とを備えた半導体装置の製造方法において、
酸素の含有量を1ppb以下にした水素添加超純水にIPAを添加した洗浄液を用いて、酸素含有量1ppb以下の窒素雰囲気でしかも遮光した状態で表面の洗浄を行ない、かつ等方性酸化または窒化で前記ゲート絶縁膜を形成することにより、
前記チャンネル領域と前記ゲート絶縁膜との界面の平坦度を、前記ソース領域から前記ドレイン領域に向かう方向での長さ2nmにおけるピーク・トゥ・バレイ値が0.3nm以下となるようにするとともに、前記第1の電極のうち、前記ソース領域又は前記ドレイン領域に接続する部分を金属シリサイドとし、該金属シリサイドと該金属シリサイドが接続するソース領域又はドレイン領域との仕事関数の差が0.32eV程度以下となるように前記金属シリサイドを構成する金属を選ぶことを特徴とする半導体装置の製造方法。 - 前記等方性酸化または窒化が、高密度プラズマを用いた酸素ラジカルまたは窒素ラジカルによる酸化または窒化であることを特徴とする請求項1乃至3のいずれか一つに記載の半導体装置の製造方法。
- 前記チャンネル領域、前記ソース領域、および前記ドレイン領域がシリコン層に設けられ、前記シリコン層の前記チャンネル領域の表面が(110)面または(110)面から±10°以内の面であることを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記チャンネル領域の表面が(551)面であることを特徴とする請求項5に記載の半導体装置の製造方法。
- 前記第1の電極から前記チャンネル領域までの抵抗が、前記第1の電極と前記ソース領域及びドレイン領域の少なくとも一つとの接触部の接触抵抗及び該接触部から前記チャンネル領域までの前記ソース領域及びドレイン領域の前記少なくとも一つの内部直列抵抗を含み、前記接触抵抗を1×10−10Ωcm2以下としたことを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記ソース領域、ドレイン領域を、その仕事関数が前記チャンネル領域の半導体の仕事関数との差が0.32eV以下であるような金属または金属半導体化合物で構成することを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記チャンネル領域をn型シリコンで構成すると共に、前記ソース領域、ドレイン領域を、その仕事関数が−4.37eV以上であるような金属または金属シリサイドで構成することを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記チャンネル領域をp型シリコンで構成すると共に、前記ソース領域、ドレイン領域を、その仕事関数が−4.85eV以下であるような金属または金属シリサイドで構成することを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記半導体装置はノーマリオフであり、かつインバージョン型またはアキュムレーション型としたことを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記半導体装置をアキュムレーション型のトランジスタとしたことを特徴とする請求項1乃至4のいずれか一つに記載の半導体装置の製造方法。
- 前記チャンネル領域上のゲート絶縁膜が、SiO2,Si3N4及び金属シリコン合金の酸化膜、金属シリコン合金の窒化膜を少なくとも一種類、含有することを特徴とする請求項1乃至3のいずれか一つに記載の半導体装置の製造方法。
- 少なくとも一対のnチャンネルトランジスタ及びpチャンネルトランジスタを有するCMOS半導体装置の製造方法において、
前記nチャンネルトランジスタ及び前記pチャンネルトランジスタを請求項1乃至6のいずれか一つに記載された半導体装置の製造方法でそれぞれ構成すると共に、
前記nチャンネルトランジスタのソース・ドレイン領域とそれぞれ接する前記第1の電極の少なくとも接続部を第1の金属シリサイドで構成し、前記pチャンネルトランジスタのソース・ドレイン領域とそれぞれ接する前記第1の電極の少なくとも接続部を前記第1の金属シリサイドとは異なる第2の金属シリサイドで構成することを特徴とするCMOS半導体装置の製造方法。 - 前記第1の金属シリサイドをその仕事関数が−4.37eV以上になるような材料で構成し、前記第2の金属シリサイドをその仕事関数が−4.85eV以下になるような材料で構成することを特徴とする請求項14に記載のCMOS半導体装置の製造方法。
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