JP2019197874A - 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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- 230000003252 repetitive effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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Abstract
Description
実施の形態にかかる半導体装置の製造方法について、耐圧400Vクラス以上(例えば650V)の半導体装置を作製(製造)する場合を例に説明する。図1,3〜7は、実施の形態にかかる半導体装置の製造途中の状態を示す断面図である。図2は、図1の不純物拡散用トレンチ付近を拡大して示す断面図である。図8は、実施の形態にかかる半導体装置の別の一例の製造途中の状態を示す断面図である。図9〜11は、図6の並列pn層を半導体基板のおもて面側から見たレイアウトの一例を示す平面図である。
次に、不純物拡散用トレンチ31〜33の内壁に沿って形成されたp型不純物領域51〜53が熱拡散処理により延在してなるp型拡散領域51’〜53’の拡散深さd1について検証した。図12は、実施例1の不純物拡散用トレンチの内壁に沿って形成されたp型不純物領域の熱拡散処理後のp型不純物濃度プロファイルをシミュレーションした結果を示す特性図である。図13は、従来例1のp型不純物領域の熱拡散処理後のp型不純物濃度プロファイルをシミュレーションした結果を示す特性図である。図14は、従来例1の半導体装置の構造を示す断面図である。
次に、並列pn層60のチャージバランスと耐圧とオン抵抗との関係について検証した。図15は、実施例2にかかる半導体装置のTCAD(Technology Computer−Aided Design)シミュレーションモデルを示す断面図である。図16は、従来例2の半導体装置のTCADシミュレーションモデルを示す断面図である。図17は、従来例2の並列pn層のチャージバランスと耐圧との関係を示す特性図である。図18は、従来例2の耐圧とオン抵抗との関係を示す特性図である。
5 半導体基板
10 n+型出発基板
11 デバイス領域
12 スクライブライン
21〜24 アライメントマーク用トレンチ
31〜33 不純物拡散用トレンチ
41,43 レジストマスク
41a レジストマスクの開口部
42,44 イオン注入
51〜53 p型不純物領域
51’〜53’ p型拡散領域
60 並列pn層
61 並列pn層のn型領域
62 並列pn層のp型領域
71,81 p型ベース領域
72,85 n+型ソース領域
73,86 p+型コンタクト領域
74,83 ゲート絶縁膜
75,84 ゲート電極
76,87 層間絶縁膜
77,88 ソース電極
78.89 ドレイン電極
82 ゲートトレンチ
d1 p型拡散領域の拡散深さ
d10 並列pn層のp型領域の厚さ
d11〜d13 不純物拡散用トレンチの深さ
t1,t2 n型エピタキシャル層の厚さ
t11 半導体基板のエピタキシャル層部分の厚さ
w1 p型拡散領域の幅
w10 並列pn層のp型領域の幅
w11 不純物拡散用トレンチの開口端の幅
w11’ 不純物拡散用トレンチの底面の幅
w12,w13 不純物拡散用トレンチの開口端の幅
w2 n型エピタキシャル層の、隣り合うp型領域間に挟まれた部分の幅
w21 アライメントマーク用トレンチの開口端の幅
w21’ アライメントマーク用トレンチの底面の幅
w3 並列pn層のn型領域とp型領域との繰り返しピッチ
w31 不純物拡散用トレンチのピッチ
w41 レジストマスクの開口部の開口幅
w51 p型不純物領域の幅
x 半導体基板のおもて面に平行な方向(第1方向:横方向)
y 半導体基板のおもて面に平行な方向で、かつ第1方向と直交する方向(第2方向:横方向)
z 半導体基板の深さ方向(縦方向)
θ 不純物拡散用トレンチの側壁と不純物拡散用トレンチの底面の延長線とのなす角度
Claims (5)
- 第1導電型領域と第2導電型領域とを交互に繰り返し配置してなる並列pn層を備えた半導体装置の製造方法であって、
半導体基板の上に、複数の第1導電型エピタキシャル層をエピタキシャル成長させて積層する成長工程と、
前記成長工程において前記第1導電型エピタキシャル層を積層させるごとに、前記第1導電型エピタキシャル層に第2導電型不純物をイオン注入して、前記第1導電型エピタキシャル層の内部に第2導電型不純物領域を形成する注入工程と、
前記成長工程において1層目の前記第1導電型エピタキシャル層をエピタキシャル成長させた後、前記注入工程を行う前に、1層目の前記第1導電型エピタキシャル層の表面から所定深さに達する第1トレンチを形成するトレンチ形成工程と、
複数の前記第1導電型エピタキシャル層にそれぞれ形成された前記第2導電型不純物領域を熱処理により拡散させて、前記第2導電型不純物領域同士を深さ方向に連結してなる前記第2導電型領域を形成する熱処理工程と、
を含み、
前記成長工程では、2層目以降の前記第1導電型エピタキシャル層をエピタキシャル成長させる際に、最表面層となる前記第1導電型エピタキシャル層の表面に、下層の前記第1導電型エピタキシャル層の前記第1トレンチに応じて形成される凹みにより形成する新たな前記第1トレンチを形成し、
前記注入工程では、
前記成長工程において前記第1導電型エピタキシャル層を積層させるごとに、
前記第1導電型エピタキシャル層の表面に、前記第1トレンチの幅よりも広い幅で前記第1トレンチを露出する開口部を有する第1マスクを形成する工程と、
前記第1マスクを用いて前記第2導電型不純物をイオン注入し、前記第1トレンチの内壁に沿って前記第2導電型不純物領域を形成する工程と、を行うことを特徴とする半導体装置の製造方法。 - 前記トレンチ形成工程では、ドライエッチングにより前記第1トレンチを形成する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。
- 前記トレンチ形成工程では、開口端の幅が底面の幅よりも狭い前記第1トレンチを形成することを特徴とする請求項2に記載の半導体装置の製造方法。
- 前記熱処理工程では、前記第2導電型領域と、複数の前記第1導電型エピタキシャル層の、前記第2導電型領域の間に挟まれた部分からなる前記第1導電型領域と、を交互に繰り返し配置してなる前記並列pn層を形成することを特徴とする請求項1〜3のいずれか一つに記載の半導体装置の製造方法。
- 前記トレンチ形成工程では、前記並列pn層を形成するデバイス領域に前記第1トレンチを形成するとともに、前記デバイス領域の周囲を囲む領域にアライメントマーク用の第2トレンチを形成することを特徴とする請求項1〜4のいずれか一つに記載の半導体装置の製造方法。
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