JP7256120B2 - 半導体装置の製造方法およびウエハ貼着構造体 - Google Patents
半導体装置の製造方法およびウエハ貼着構造体 Download PDFInfo
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Description
2 半導体ウエハ源の第1主面
3 半導体ウエハ源の第2主面
4 半導体ウエハ源の側壁
5 半導体ウエハ源の第1ウエハ縁部
6 半導体ウエハ源の第2ウエハ縁部
10 素子形成領域
11 半導体素子
21 第1支持部材
22 第1支持部材の第1支持主面
23 第1支持部材の第2支持主面
24 第1支持部材の支持側壁
25 第1支持部材の第1支持縁部
26 第1支持部材の第2支持縁部
34 第1変質層
41 素子形成ウエハ
42 素子未形成ウエハ
51 新たな半導体ウエハ源
52 新たな半導体素子
55 第2変質層
61 第2の素子形成ウエハ
62 第2の素子未形成ウエハ
Claims (27)
- 一方側の第1主面、他方側の第2主面、ならびに、前記第1主面および前記第2主面を接続する側壁を含むSiC(炭化ケイ素)からなる半導体ウエハ源を用意する工程と、
第1支持部材を用意する工程と、
前記半導体ウエハ源の前記第1主面にSiCからなるエピタキシャル層を形成する工程と、
前記エピタキシャル層に複数の素子形成領域を設定し、前記複数の素子形成領域に半導体素子をそれぞれ作り込む素子形成工程と、
前記半導体ウエハ源の前記第2主面側に前記第1支持部材を貼着する貼着工程と、
前記素子形成工程の後、前記半導体ウエハ源が前記第1支持部材に支持された状態で前記半導体ウエハ源の厚さ方向途中部から前記第1主面に平行な水平方向に沿って前記半導体ウエハ源にレーザ光を照射して前記半導体ウエハ源に変質層を形成した後、前記半導体ウエハ源を前記半導体素子が形成された素子形成ウエハおよび前記第1支持部材によって支持された素子未形成ウエハに分離するウエハ源分離工程と、
前記ウエハ源分離工程の後に前記素子形成ウエハの裏面側に裏面(第2主面)電極を形成する工程と、を含む、半導体装置の製造方法。 - 前記ウエハ源分離工程の後、前記素子未形成ウエハが再利用可能である場合、前記素子未形成ウエハを新たな半導体ウエハ源として再利用し、前記半導体ウエハ源が前記第1支持部材に支持された状態で前記新たな半導体ウエハ源の切断面に新たな半導体素子を作り込むウエハ源再利用工程をさらに含む、請求項1に記載の半導体装置の製造方法。
- 前記ウエハ源分離工程の後、前記新たな半導体素子を作り込む工程に先立って、前記新たな半導体ウエハ源の前記切断面を研磨する研磨工程をさらに含み、
前記新たな半導体素子は、前記研磨工程の後の前記新たな半導体ウエハ源の前記切断面に作り込まれる、請求項2に記載の半導体装置の製造方法。 - 前記研磨工程において、前記新たな半導体ウエハ源の前記切断面は、算術平均粗さRaが1nm以下になるまで研磨される、請求項3に記載の半導体装置の製造方法。
- 前記ウエハ源再利用工程は、前記素子未形成ウエハの厚さが、前記素子形成ウエハの厚さ以上である場合に実施される、請求項2~4のいずれか一項に記載の半導体装置の製造方法。
- 前記ウエハ源再利用工程の後、前記新たな半導体ウエハ源が前記第1支持部材に支持された状態で前記新たな半導体ウエハ源の厚さ方向途中部から前記切断面に平行な水平方向に沿って前記新たな半導体ウエハ源に変質層を形成した後、前記新たな半導体ウエハ源を、第2の素子形成ウエハおよび第2の素子未形成ウエハに分離する第2のウエハ源分離工程をさらに含む、請求項2~5のいずれか一項に記載の半導体装置の製造方法。
- 前記ウエハ源再利用工程および前記第2のウエハ源分離工程を順に繰り返すウエハ源再利用繰り返し工程をさらに含む、請求項6に記載の半導体装置の製造方法。
- 前記ウエハ源再利用繰り返し工程は、前記第2の素子未形成ウエハの厚さが、前記第2の素子形成ウエハの厚さ以上の場合に実施される、請求項7に記載の半導体装置の製造方法。
- 前記第1支持部材の貼着工程は、前記素子形成工程に先立って実施され、
前記素子形成工程は、前記半導体ウエハ源が前記第1支持部材に支持された状態で実施される、請求項1~8のいずれか一項に記載の半導体装置の製造方法。 - 前記第1支持部材の貼着工程は、前記素子形成工程の後に実施される、請求項1~9のいずれか一項に記載の半導体装置の製造方法。
- 前記ウエハ源分離工程の後、前記素子未形成ウエハが再利用不能である場合、前記第1支持部材から前記素子未形成ウエハを除去し、前記第1支持部材を別の半導体ウエハ源を支持する支持部材として再利用する支持部材再利用工程をさらに含む、請求項1~10のいずれか一項に記載の半導体装置の製造方法。
- 前記支持部材再利用工程は、前記素子未形成ウエハの厚さが、前記素子形成ウエハの厚さ以下である場合に実施される、請求項11に記載の半導体装置の製造方法。
- 前記ウエハ源分離工程に先立って、第2支持部材を用意する工程と、
前記ウエハ源分離工程に先立って、前記半導体ウエハ源の前記第1主面側に前記第2支持部材を貼着する工程と、をさらに含み、
前記ウエハ源分離工程は、前記半導体ウエハ源が前記第1支持部材および前記第2支持部材に支持された状態で前記半導体ウエハ源に変質層を形成した後、前記半導体ウエハ源を前記第2支持部材によって支持された前記素子形成ウエハおよび前記第1支持部材によって支持された前記素子未形成ウエハに分離する工程を含む、請求項1~12のいずれか一項に記載の半導体装置の製造方法。 - 前記ウエハ源分離工程は、
レーザ光照射法により、前記水平方向に沿い、結晶状態が他の領域とは異なる性質に変質した変質層を前記半導体ウエハ源の前記厚さ方向途中部に形成する変質層形成工程と、
前記変質層を起点にして前記半導体ウエハ源を前記水平方向に沿って前記半導体ウエハ源を前記素子形成ウエハおよび前記素子未形成ウエハに分離する工程と、を含む、請求項1~13のいずれか一項に記載の半導体装置の製造方法。 - 前記第1支持部材は、光透過性を有するSiCからなり 、
前記変質層形成工程は、前記半導体ウエハ源の前記第2主面側から前記第1支持部材を介してレーザ光を照射することにより、前記半導体ウエハ源の前記厚さ方向途中部に前記変質層を形成する工程を含む、請求項14に記載の半導体装置の製造方法。 - 前記ウエハ源分離工程の後、前記複数の素子形成領域に沿って前記素子形成ウエハを切断することにより、複数の半導体装置を切り出す工程をさらに含む、請求項1~15のいずれか一項に記載の半導体装置の製造方法。
- 前記第1支持部材は、光透過性を有する接合層を介して前記半導体ウエハ源の前記第2主面に貼着される、請求項1~16のいずれか一項に記載の半導体装置の製造方法。
- 素子形成面としての第1主面、および、前記第1主面の反対側に位置する非素子形成面としての第2主面を有し、厚さ方向途中部から前記第1主面に平行な水平方向に沿って切断できる厚さを有するSiCからなる半導体ウエハ源と、
前記半導体ウエハ源の前記第1主面に形成されたエピタキシャル層と、
前記エピタキシャル層に形成された回路素子と、
前記半導体ウエハ源の前記第2主面に貼着された第1支持主面、および、前記第1支持主面の反対側に位置する第2支持主面を有する板状の支持部材と、を含む、ウエハ貼着構造体。 - 前記支持部材は、前記半導体ウエハ源の平面面積以上の平面面積を有している、請求項18に記載のウエハ貼着構造体。
- 前記半導体ウエハ源は、結晶方位を示す第1目印を含み、
前記支持部材は、前記半導体ウエハ源の結晶方位を示す第2目印を含む、請求項18または19に記載のウエハ貼着構造体。 - 前記半導体ウエハ源および前記支持部材は、SiCからなり1600℃以上の融点を有している、請求項18~20のいずれか一項に記載のウエハ貼着構造体。
- 前記半導体ウエハ源は、前記第1主面および前記第2主面を接続する側壁、前記第1主面および前記側壁を接続する第1ウエハ縁部、ならびに、前記第2主面および前記側壁を接続し、面取りされていない第2ウエハ縁部を含む、請求項18~21のいずれか一項に記載のウエハ貼着構造体。
- 前記支持部材は、前記第1支持主面および前記第2支持主面を接続する支持側壁、前記第1支持主面および前記支持側壁を接続し、面取りされた第1支持縁部、ならびに、前記第2支持主面および前記支持側壁を接続し、面取りされた第2支持縁部を含む、請求項18~22のいずれか一項に記載のウエハ貼着構造体。
- 前記半導体ウエハ源の前記第2主面および前記支持部材の前記第1支持主面の間の境界領域において前記半導体ウエハ源および前記支持部材を接合する接合層をさらに含む、請求項18~23のいずれか一項に記載のウエハ貼着構造体。
- 前記接合層は、光透過性を有している、請求項24に記載のウエハ貼着構造体。
- 前記接合層は、アモルファス層を含む、請求項24または25に記載のウエハ貼着構造体。
- 前記第1支持部材は、光透過性を有し前記半導体ウエハ源の物理的性質と比較的近い物理的性質を有し、
前記ウエハ源分離工程では、前記第1支持部材を介してレーザ光を照射する、請求項1に記載の半導体の製造方法。
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