JP6931052B2 - 半導体構造体を形成する方法および縦型トランスポートfet構造体 - Google Patents
半導体構造体を形成する方法および縦型トランスポートfet構造体 Download PDFInfo
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- JP6931052B2 JP6931052B2 JP2019520417A JP2019520417A JP6931052B2 JP 6931052 B2 JP6931052 B2 JP 6931052B2 JP 2019520417 A JP2019520417 A JP 2019520417A JP 2019520417 A JP2019520417 A JP 2019520417A JP 6931052 B2 JP6931052 B2 JP 6931052B2
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Description
Claims (19)
- 半導体構造体を形成する方法であって、
単結晶シリコンを含む第1の表面と、誘電材料を含む少なくとも1つの別の表面とを含む基板を設けることと、
前記第1の表面上に単結晶シリコンを形成するためと前記別の表面上にポリシリコン/アモルファス・シリコンを形成するために、ドーパントを有するシリコン層を500℃未満の温度で前記基板上にエピタキシャル成長させることと、
前記別の表面上の前記ポリシリコン/アモルファス・シリコンを選択的に除去するためと前記第1の表面上に形成された前記単結晶シリコンの外面上および外面内にゲルマニウム拡散領域を形成するために有効な時間だけ、前記エピタキシャル成長させたシリコン層を500℃未満の温度でHClとゲルマンとを含むエッチャントに暴露することと、
を含む方法。 - 前記第1の表面上の前記単結晶シリコンと、前記ポリシリコン/アモルファス・シリコンとはその間に境界を含み、前記境界の形状は多面である、請求項1に記載の方法。
- 前記ドーパントを有する前記シリコン層の成長は、リン含有ガスと、SiH4とSi2H6とSi3H8とSi4H10とからなるグループから選択されたシリコン含有ガスとの、ガス状混合物に前記基板を暴露することを含む、請求項1に記載の方法。
- 前記第1の表面は、縦型フィンFET構造の縦向きチャネル領域の露出上面である、請求項1に記載の方法。
- 前記第1の表面上の前記単結晶シリコンは、縦型フィンFET構造の上部ソースまたはドレイン領域を画定する、請求項1に記載の方法。
- 前記ドーパントを有する前記シリコン層の前記成長と、前記成長させたシリコン層の前記エッチャントへの前記暴露とが繰り返され、前記第1の表面上に形成された前記単結晶シリコンの中および上に前記ゲルマニウム拡散領域の複数の層が形成される、請求項1に記載の方法。
- 前記誘電材料は酸化物または窒化物である、請求項1に記載の方法。
- 前記リン含有ガスはホスフィンである、請求項3に記載の方法。
- 縦型トランスポート電界効果トランジスタ(VTFET)デバイスに上部ソースまたはドレイン領域を形成する方法であって、
部分的VTFET構造体を含む半導体基板をエピタキシャル堆積チャンバ内に配置することであって、前記部分的VTFET構造体は、基板と、底部ドープ・ソースまたはドレイン領域と、前記底部ドープ・ソースまたはドレイン領域から延びる縦向きチャネル領域と、前記チャネル領域の上で、前記底部ドープ・ソースまたはドレイン領域の一部に重なる底部スペーサと上部スペーサとの間にあるゲート・スタックとを含み、前記部分的VTFET構造体の堆積面が誘電材料と前記チャネル領域の最上部とを含む、前記配置することと、
材料層の堆積のために前記堆積面に500℃未満の温度で第1のソース・ガスを当てることであって、前記第1のソース・ガスはリン含有ガスと、SiH4とSi2H6とSi3H8とSi4H10とからなるグループから選択されたシリコン含有ガスとを含み、前記誘電材料上にドープ・ポリシリコン/アモルファス・シリコン層が形成され、前記チャネル領域の露出された前記最上部上にドープ単結晶シリコン層が形成される、前記第1の
ソース・ガスを当てることと、
表面改質とエッチングとのためにHClとゲルマンとを含む第2のソース・ガスを当てることであって、前記表面改質が、前記ドープ単結晶シリコン層に対して前記ドープ・ポリシリコン/アモルファス・シリコン層の一部を選択的に除去するとともに前記VTFETデバイスに前記上部ソースまたはドレイン領域を形成するように、前記HClのエッチャントとの接触時にゲルマニウム原子拡散部分を除去可能にするために、ゲルマニウム原子を前記ドープ・ポリシリコン/アモルファス・シリコン層の一部に選択的に拡散させる、前記第2のソース・ガスを当てることと、
を含む方法。 - 前記誘電材料が酸化物または窒化物である、請求項9に記載の方法。
- 前記チャネル領域の露出された前記最上部上に形成された前記ドープ単結晶シリコン層は多面である、請求項9に記載の方法。
- 前記チャネル領域の露出された前記最上部上に形成された前記ドープ単結晶シリコン層が菱形形状である、請求項9に記載の方法。
- 前記チャネル領域の露出された前記最上部上に形成された前記ドープ単結晶シリコン層が前記VTFETの上部ソースまたはドレイン領域を画定する、請求項9に記載の方法。
- 堆積とその後の前記表面改質およびエッチングとの複数回のサイクルを行うために前記第1のソース・ガスと前記第2のソース・ガスとを繰り返すことをさらに含み、前記ドープ単結晶シリコン層が、前記ドープ単結晶シリコン層の上および中にゲルマニウム原子拡散領域の薄い層を含む、請求項9に記載の方法。
- 前記チャネル領域の露出された前記最上部が前記誘電材料を越えて延びる、請求項9に記載の方法。
- 前記リン含有ガスがホスフィンである、請求項9に記載の方法。
- 縦型トランスポートFET(VTFET)構造体であって、
フィン構造の縦向きチャネル領域から延びる上部ソースまたはドレイン領域の外面に形成されたゲルマニウム原子拡散領域を含むドープ単結晶シリコンの前記上部ソースまたはドレイン領域を含み、前記縦向きチャネル領域が底部ソースまたはドレイン領域と前記上部ソースまたはドレイン領域との間に延びる、縦型トランスポートFET構造体。 - 前記上部ソースまたはドレイン領域が多面である、請求項17に記載のVTFET構造体。
- 前記上部ソースまたはドレイン領域が菱形形状である、請求項17に記載のVTFET構造体。
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