JP2018170456A - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- JP2018170456A JP2018170456A JP2017068171A JP2017068171A JP2018170456A JP 2018170456 A JP2018170456 A JP 2018170456A JP 2017068171 A JP2017068171 A JP 2017068171A JP 2017068171 A JP2017068171 A JP 2017068171A JP 2018170456 A JP2018170456 A JP 2018170456A
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Abstract
【解決手段】ゲートコンタクト孔を、セル外周領域のトレンチ直上に、自己整合的に形成し、ゲート配線電極を接続する。
【選択図】図2
Description
本発明は、上記の点に鑑み、チップ面積の縮小化が可能な半導体装置およびその製造方法を提供することを目的とする。
すなわち、基板に形成されたトレンチと、前記トレンチの内側の底面及び側面を覆うように形成されたゲート絶縁膜と、前記ゲート絶縁膜を介してトレンチ内に埋め込まれたゲート電極とを有し、縦型トランジスタを含むセル領域と、前記ゲート電極上に形成されたゲート金属配線を含むゲート電極引き出し領域とを備えた半導体装置であって、前記ゲート電極引き出し領域は、前記トレンチ内に前記基板表面より低く、前記トレンチ底面より高い所定の高さまで埋め込まれた前記ゲート電極と、前記所定の高さから前記基板表面の高さまでの前記トレンチの側面に沿って設けられた側壁絶縁領域と、下側部分が前記ゲート電極に接し、前記側壁絶縁領域に囲まれた領域に形成されたゲート金属配線とを備えることを特徴とする。
また、以下の実施形態ではNチャネル型の縦型トレンチMOSFETにより本発明を具体化している。なお、Pチャネル型のトレンチMOSFETに対しても、各領域の導電型を反対にすることで以下の説明が同様に適用できる。
102、202 エピタキシャル層
103a、203a ベース領域
103b、203b ベースコンタクト領域
104、204 ソース領域
105、205 マスク絶縁膜
106a、206a 第1のトレンチ
106b、206b 第2のトレンチ
107、207 ゲート絶縁膜
108、208 ゲート電極
109、209 第1の層間絶縁膜
110、210 ゲートコンタクト孔
111、211 ゲート金属配線
112、212 ソース電極
113、213 ドレイン電極
114a、214a 第1のセル領域
114b、214b 第2のセル領域
115、215 セル外周領域
116、216 ドレイン領域
117 フォトレジスト
118 第2の層間絶縁膜
120、220 側壁絶縁領域
130、230 基板
H1 第1の高さ
Claims (11)
- 基板に形成され、第1のトレンチを含む縦型トランジスタを有するセル領域と、
前記第1のトレンチと接続された第2のトレンチを有するゲート電極引き出し領域と、
前記第1のトレンチ及び前記第2のトレンチの底面及び所定の高さまでの側面に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して、前記第1のトレンチ内部と前記第2のトレンチ内部の前記所定の高さまで埋め込まれたゲート電極と、
を備えた半導体装置であって、
前記ゲート電極引き出し領域は、
前記所定の高さから前記基板表面の高さまでの前記第2のトレンチの側面に沿って設けられた側壁絶縁領域と、
下側部分が前記ゲート電極に接し前記第2のトレンチ内部の前記所定の高さから上の、前記側壁絶縁領域に囲まれた領域に形成されたゲート金属配線と、
を備えることを特徴とする半導体装置。 - 前記第1のトレンチの幅と前記第2のトレンチの幅が略同一のサイズであることを特徴とする請求項1に記載の半導体装置。
- 前記側壁絶縁領域が、前記第2のトレンチの側面に沿って内側に設けられた、第1の絶縁膜であることを特徴とする請求項1または2に記載の半導体装置。
- 前記側壁絶縁領域が、前記基板の中の前記第2のトレンチの側面に沿って外側の前記基板の中に設けられた、不純物拡散領域であることを特徴とする請求項1または2に記載の半導体装置。
- 前記セル領域の前記第1のトレンチ内部に設けられた前記ゲート電極の上に、前記第1のトレンチの上端より高い位置に上側部分を有する第2の絶縁膜を備えたことを特徴とする請求項1乃至4のいずれか一項に記載の半導体装置。
- 基板と、
前記基板に形成された、第1のトレンチを有する縦型トランジスタが配置されたセル領域と、
前記第1のトレンチと接続された第2のトレンチを有するゲート電極引き出し領域と、
を備え、
前記第1のトレンチおよび前記第2のトレンチは、
底面及び側面に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して、前記第1のトレンチ内部と前記第2のトレンチ内部にそれぞれ埋め込まれたゲート電極と、
を有し、
前記ゲート電極引き出し領域は、
少なくとも前記ゲート電極の上端から前記基板の最上面まで、前記第2のトレンチの内側面あるいは外側面のいずれか一方に沿って設けられた側壁絶縁領域と、
前記第2のトレンチ内部の前記ゲート電極の上端および前記側壁絶縁領域に囲まれた領域に設けられたゲート金属配線と、
を有することを特徴とする半導体装置。 - 前記第1のトレンチの幅と前記第2のトレンチの幅が略同一のサイズであることを特徴とする請求項6に記載の半導体装置。
- 前記側壁絶縁領域が、前記第2のトレンチの側面に沿って内側に設けられた、第1の絶縁膜であることを特徴とする請求項6または7に記載の半導体装置。
- 前記側壁絶縁領域が、前記基板の中の前記第2のトレンチの側面に沿って外側の前記基板の中に設けられた、不純物拡散領域であることを特徴とする請求項6または7に記載の半導体装置。
- 前記セル領域の前記第1のトレンチ内部に設けられた前記ゲート電極の上に、前記第1のトレンチの上端より高い位置に上側部分を有する第2の絶縁膜を備えたことを特徴とする請求項6乃至9のいずれか一項に記載の半導体装置。
- 基板上に第1の絶縁層を形成する工程と、
前記第1の絶縁層に開口部を形成し、開口部内部において露出した基板をエッチングし、第1のトレンチと第2のトレンチを形成する工程と、
前記第1のトレンチ及び第2のトレンチの内側の底面及び側面を覆うようにゲート絶縁膜を形成する工程と、
前記第1のトレンチ及び前記第2のトレンチを埋め込み、上面が平坦となるまでゲート層を堆積する工程と、
上面が、前記第1のトレンチ内部及び第2のトレンチ内部の底面から前記基板表面までの間の所定の高さとなるまで前記ゲート層をエッチバックし、ゲート電極を形成する工程と、
前記第1のトレンチ及び前記第2のトレンチを埋め込み、上面が平坦となるまで第2の絶縁層を堆積する工程と、
前記第2の絶縁層を前記第1の絶縁層の上面が露出するまでエッチバックする工程と、
前記第2のトレンチ内部の前記ゲート電極上の前記第2の絶縁層を選択的にエッチングし、前記ゲート電極を露出する工程と、
前記第1のトレンチ周辺の前記第1の絶縁層を選択的にエッチングし、前記第1のトレンチ周辺の前記基板表面を露出する工程と、
第3の絶縁層を、前記第2のトレンチを完全に埋め込まない膜厚で堆積する工程と、
前記第3の絶縁層に対して異方性エッチングを行い、前記基板表面を露出させるとともに、前記第2のトレンチ内部の前記ゲート電極上の側面に側壁絶縁領域を残す工程と、
前記第2のトレンチ内部の前記側壁絶縁領域に囲まれる領域に、前記ゲート電極と接してゲート金属を埋め込むゲート金属形成工程とを備えることを特徴とする半導体装置の製造方法。
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