JP7212772B2 - スーパージャンクション半導体デバイスの製作 - Google Patents
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Description
[0001] 本願は、“SUPER-JUNCTION SEMICONDUCTOR DEVICE FABRICATION”(スーパージャンクション半導体デバイスの製作)と題し、2018年7月28日に出願された米国仮特許出願第62/738,961号の優先権を主張する。この特許出願をここで引用したことにより、その内容全体が本願にも含まれるものとする。
Claims (23)
- SJデバイスのスーパージャンクション(SJ)層の製造方法であって、
下地層上に第1導電型を有する第1エピタキシャル(エピ)層を形成するステップであって、前記下地層を広バンドギャップ材料で形成する、ステップと、
前記第1エピ層の第1部分および第2部分上に第1材料を配置し、次いで前記第1材料をパターニングして、前記第1エピ層の第2部分を選択的に露出させることによって、第1マスクを形成するステップと、
前記第1導電型を有する第1組のSJピラーを、前記第1エピ層の露出した第2部分に選択的に打ち込むステップと、
前記第1材料とは異なる第2材料を、前記第1エピ層の第2部分上に配置することによって、第2マスクを形成するステップであって、前記第2マスクが前記第1マスクに対して自己整合される、ステップと、
前記第1マスクを除去し、前記第1エピ層の第2部分を露出させずに、前記第1エピ層の第1部分を露出させるステップと、
第2導電型を有する第2組のSJピラーを、前記第1エピ層の露出した第1部分に選択的に打ち込むステップと、
前記第2マスクを除去して、前記SJ層を生成するステップと、
を含む、方法。 - 請求項1記載の方法であって、
前記第1導電型を有する第2エピ層を、前記SJ層上に形成するステップであって、前記第2エピ層を前記広バンドギャップ材料で形成する、ステップと、
前記第1材料を前記第2エピ層の第1部分および第2部分上に配置し、次いで前記第1材料をパターニングして前記第2エピ層の第2部分を選択的に露出させることによって、前記第1マスクを形成するステップと、
前記第1組のSJピラーを、前記第2エピ層の第2部分に選択的に打ち込むステップと、
前記第2材料を前記第2エピ層の第2部分上に配置することによって、第2マスクを形成するステップであって、前記第2マスクが、前記第2エピ層上の前記第1マスクに対して自己整合される、ステップと、
前記第1マスクを除去して、前記第2エピ層の第2部分を露出させることなく、前記第2エピ層の第1部分を露出させるステップと、
前記第2導電型を有する前記第2組のSJピラーを、前記第2エピ層の露出した第1部分に選択的に打ち込むステップと、
前記第2マスクを除去して、追加のSJ層を生成するステップと、
を含む、方法。 - 請求項2記載の方法において、前記第1組のSJピラーを前記第2エピ層の第2部分に打ち込むステップが、前記第2エピ層の厚さ全体を貫通し、前記第1エピ層の第1組のSJピラーと接触するように、前記第1組のSJピラーを打ち込むステップを含む、方法。
- 請求項1記載の方法において、前記第1組のSJピラーを打ち込むステップが、約0.1メガ-電子ボルト(MeV)以上の打ち込みエネルギを使用して打ち込むステップを含む、方法。
- 請求項4記載の方法において、前記打ち込みエネルギが、約50MeV未満である、方法。
- 請求項1記載の方法において、前記第1組のSJピラーを打ち込むステップが、約5ミクロン(μm)以上の深さまで打ち込むステップを含む、方法。
- 請求項6記載の方法において、前記深さが約15μm以下である方法。
- 請求項1記載の方法において、前記第1組のSJピラーを打ち込むステップが、前記第1エピ層の厚さを貫通して、前記下地層に接触するように、前記第1組のSJピラーを打ち込むステップを含む、方法。
- 請求項1記載の方法において、前記第1エピ層が炭化硅素(SiC)を含む、方法。
- 請求項1記載の方法であって、1立方センチメートル(cm3)当たり約5×1015未満のドーピング濃度で、前記第1エピ層を形成するステップを含む、方法。
- 請求項10記載の方法において、前記ドーピング濃度が、1立方センチメートル(cm3)当たり約1×1014以上である、方法。
- 請求項1記載の方法において、前記第1組のSJピラーが、1立方センチメートル(cm3)当たり約5×1015と1立方センチメートル(cm3)当たり約10×1017との間のドーピング濃度を含む、方法。
- 請求項1記載の方法において、前記下地層が、半導体基板層、第2エピ層、追加のSJ層、またはこれらの組み合わせを含む、方法。
- 請求項1記載の方法であって、前記第1導電型を有するデバイス層を前記SJ層の上方に形成して、スーパージャンクション(SJ)半導体デバイスを生成するステップを含み、前記SJ半導体デバイスが、金属酸化物半導体電界効果トランジスタ(MOSFET)、接合型電界効果トランジスタ(JFET)、バイポーラ接合トランジスタ(BJT)、またはダイオードを含む、方法。
- スーパージャンクション(SJ)半導体デバイス中間品であって、
第1導電型を有するエピタキシャル(エピ)層であって、前記エピ層が広バンドギャップ材料を含み、前記エピ層の第1部分が、第2導電型を有する複数の打ち込みスーパージャンクション(SJ)ピラーを含む、エピタキシャル(エピ)層と、
前記エピ層の第1部分の上方に直接配置された第1高エネルギ打ち込みマスクであって、第1材料を含む、第1高エネルギ打ち込みマスクと、
前記第1高エネルギ打ち込みマスクに対して自己整合されて、前記エピ層の第2部分の上方に直接配置された第2高エネルギ打ち込みマスクであって、前記第2高エネルギ打ち込みマスクが、前記第1材料とは異なる第2材料を含み、前記エピ層の第2部分が前記第1高エネルギ打ち込みマスクによって覆われない、第2高エネルギ打ち込みマスクと、
を備える、スーパージャンクション(SJ)半導体デバイス中間品。 - 請求項15記載のSJ半導体デバイス中間品において、前記第1高エネルギ打ち込みマスクおよび前記第2高エネルギ打ち込みマスクが、酸化硅素、窒化硅素、多結晶シリコン、シリコン、金属層、またはレジスト層の内異なる1つ以上を独立して含む、SJ半導体デバイス中間品。
- 方法であって、
A)第1導電型を有するエピタキシャル(エピ)層を下地層上に形成するステップであって、前記下地層を広バンドギャップ材料で形成する、ステップと、
B)第1材料を含み前記エピ層の第1部分上に配置される第1マスクを形成するステップであって、前記エピ層の第2部分が前記第1マスクによって露出される、ステップと、
C)第2導電型を有する第1組のスーパージャンクション(SJ)ピラーを、前記エピ層の第2部分に選択的に打ち込むステップと、
D)第2材料を含み前記エピ層の第2部分上に配置される第2マスクを形成するステップであって、前記第2マスクが、前記第1マスクに対して自己整合され、前記第2材料が前記第1材料とは異なる、ステップと、
E)前記第1マスクを除去して、前記エピ層の第2部分を露出せずに、前記エピ層の第1部分を露出させるステップと、
F)前記第1導電型を有する第2組のSJピラーを、前記エピ層の露出した第1部分に選択的に打ち込むステップと、
G)前記第2マスクを除去して、スーパージャンクション(SJ)層を生成するステップと、
H)前記SJ層の上方に、前記第1導電型を有するデバイス層を形成し、スーパージャンクション(SJ)半導体デバイスを生成するステップと、
を含む、方法。 - 請求項17記載の方法であって、ステップHの前に、追加のSJ層を形成するために、ステップA~Gを少なくとも1回は繰り返すステップを含む、方法。
- 請求項17記載の方法において、前記エピ層を形成するステップが、前記下地層上に前記エピ層を直接成長させるステップを含む、方法。
- 請求項17記載の方法において、前記第2組のSJピラーを選択的に打ち込むステップが、前記第2組のSJピラーを、前記第1組のSJピラーに隣接し、それらの間で交互配置されて打ち込むステップを含む、方法。
- 請求項17記載の方法において、前記第1組のSJピラーを選択的に打ち込むステップが、硼素、アルミニウム、またはこれらの組み合わせによって打ち込むステップを含み、前記第2組のSJピラーを選択的に打ち込むステップが、窒素、燐、またはその追加の組み合わせを打ち込むステップを含む、方法。
- 請求項17記載の方法において、前記下地層が半導体基板層を含み、前記半導体基板層が炭化硅素(SiC)を含む、方法。
- 請求項17記載の方法において、前記スーパージャンクション(SJ)半導体デバイスが、金属酸化物半導体電界効果トランジスタ(MOSFET)、接合型電界効果トランジスタ(JFET)、バイポーラ接合トランジスタ(BJT)、またはダイオードである、方法。
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