WO2022123872A1 - 半導体基板及びその製造方法 - Google Patents
半導体基板及びその製造方法 Download PDFInfo
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- WO2022123872A1 WO2022123872A1 PCT/JP2021/036388 JP2021036388W WO2022123872A1 WO 2022123872 A1 WO2022123872 A1 WO 2022123872A1 JP 2021036388 W JP2021036388 W JP 2021036388W WO 2022123872 A1 WO2022123872 A1 WO 2022123872A1
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- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/872—Schottky diodes
Abstract
Description
本実施の形態に係る半導体基板は、図1(b)に示すように、SiC単結晶基板(SiCSB)10SBと、SiC単結晶基板10SBのSi面上に配置された第1のグラッフェン層(GR1)11GR1と、第1のグラッフェン層11GR1を介してSiC単結晶基板10SBの上方に配置されたエピタキシャル成長層(SiC-epi)12REと、エピタキシャル成長層12REのSi面上に形成された第2のグラッフェン層(GR2)11GR2とを備える。
本実施の形態に係る半導体基板の製造方法について説明する。
比較例に係る半導体基板及びその製造方法について説明する。
実施の形態に係る半導体基板の製造方法において、SiC多結晶基板16Pは、焼結SiC基板で形成可能である。
実施の形態に係る半導体基板を用いて作製した半導体装置として、SiC-SBD21は、図11に示すように、SiC多結晶成長層(CVD)18PCとSiCエピタキシャル成長層12REとからなる半導体基板1を備える。尚、SiC多結晶成長層18PCとSiCエピタキシャル成長層12REとの間に、高濃度ドープ層12RENを介在させても良い。ここで、高濃度ドープ層12RENにより、SiCエピタキシャル成長層12RE中に広がる空乏層の広がりを抑制し、かつSiCエピタキシャル成長層12REのC面に形成されるSiC多結晶成長層18PCとのオーミックコンタクトを容易に形成することができる。SiCエピタキシャル成長層12REはドリフト層、高濃度ドープ層12RENはバッファ層、SiC多結晶成長層18PCはサブストレート層となる。
実施の形態に係る半導体基板を用いて作製した半導体装置として、トレンチゲート型MOSFET31は、図12に示すように、SiC多結晶成長層18PCとSiCエピタキシャル成長層12REとからなる半導体基板1を備える。尚、SiC多結晶成長層18PCとSiCエピタキシャル成長層12REとの間に、高濃度ドープ層12RENを介在させても良い。ここで、高濃度ドープ層12RENにより、SiCエピタキシャル成長層12RE中に広がる空乏層の広がりを抑制し、かつSiCエピタキシャル成長層12REのC面に形成されるSiC多結晶成長層18PCとのオーミックコンタクトを容易に形成することができる。SiCエピタキシャル成長層12REはドリフト層、高濃度ドープ層12RENはバッファ層、SiC多結晶成長層18PCはサブストレート層となる。
実施の形態に係る半導体基板1を用いて作製した半導体装置として、プレーナゲート型MOSFET51は、図13に示すように、SiC多結晶成長層18PCとSiCエピタキシャル成長層12REとからなる半導体基板1を備える。尚、SiC多結晶成長層18PCとSiCエピタキシャル成長層12REとの間に、高濃度ドープ層12RENを介在させても良い。ここで、高濃度ドープ層12RENにより、SiCエピタキシャル成長層12RE中に広がる空乏層の広がりを抑制し、かつSiCエピタキシャル成長層12REのC面に形成されるSiC多結晶成長層18PCとのオーミックコンタクトを容易に形成することができる。SiCエピタキシャル成長層12REはドリフト層、高濃度ドープ層12RENはバッファ層、SiC多結晶成長層18PCはサブストレート層となる。
図14は、SiCの結晶面を説明する図である。図14(a)の平面図には1次オリフラ(orientation flat)201及び2次オリフラ202が形成されたSiCウェハ200のSi面211が示されている。図14(b)の[-1100]の方位から見た側面図では、上面に[0001]の方位のSi面211が形成され、下面に[000-1]の方位のC面212が形成されている。
SiC多結晶成長層18PCと、SiCエピタキシャル成長層12REとを備える。
SiCエピタキシャル成長層12REに適用可能な4H-SiC結晶のユニットセルの模式的鳥瞰構成は、図16(a)に示すように表され、4H-SiC結晶の2層部分の模式的構成は、図16(b)に示すように表され、4H-SiC結晶の4層部分の模式的構成は、図16(c)に示すように表される。
上記のように、いくつかの実施の形態について記載したが、開示の一部をなす論述及び図面は例示的なものであり、限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。
10SB…SiC単結晶基板
11GR1、11GR2、11GF…グラッフェン層
12RE…SiCエピタキシャル成長層(第1層)
12REN…高濃度ドープ層
16P…SiC多結晶基板
18PC…SiC多結晶成長層(CVD)(第2層)
21…半導体装置(SiC-SBD)
31…半導体装置(SiC-TMOSFET)
51…半導体装置(SiC-MOSFET)
200…SiCウェハ
201…1次オリフラ
202…2次オリフラ
211、[S]…Si面
212、[C]…C面
500…製造装置
GS1、GS2、GS3、…、GSn…グラファイトシート
S…ソース端子
D…ドレイン端子
G…ゲート端子
A…アノード端子
K…カソード端子
Claims (14)
- SiC単結晶基板と、
前記SiC単結晶基板のSi面上に配置された第1のグラッフェン層と、
前記第1のグラッフェン層を介して前記SiC単結晶基板の上方に配置されたエピタキシャル成長層と、
前記エピタキシャル成長層のSi面上に配置された第2のグラッフェン層と
を備える、半導体基板。 - 前記第2のグラッフェン層を介して前記エピタキシャル成長層上に仮接合されたSiC多結晶基板を更に備える、請求項1に記載の半導体基板。
- 前記第1のグラッフェン層は、グラッフェンの単層構造又は複数層積層化された構造を備える、請求項1又は2に記載の半導体基板。
- 前記SiC多結晶基板は、焼結SiC基板又はCVD基板を備える、請求項2に記載の半導体基板。
- 前記SiC単結晶基板は、前記エピタキシャル成長層から剥離することで、再利用可能である、請求項1~4のいずれか1項に記載の半導体基板。
- 前記エピタキシャル成長層のC面にCVD成長されたSiC多結晶成長層を備え、
前記エピタキシャル成長層は、前記SiC多結晶成長層に転写される、請求項1~5のいずれか1項に記載の半導体基板。 - 前記SiC単結晶基板は、4H-SiC、6H-SiC、又は2H-SiCのいずれかの結晶構造を備える、請求項1~6のいずれか1項に記載の半導体基板。
- 前記エピタキシャル成長層は、前記SiC多結晶成長層と接するC面に前記エピタキシャル成長層よりも高不純物濃度の層を備える、請求項6に記載の半導体基板。
- 基礎となる単結晶基板のSi面に第1のグラッフェン層を形成する工程と、
前記第1のグラッフェン層を介して単結晶のSiC半導体で形成された第1層をエピタキシャル成長させる工程と、
前記第1層のSi面上に第2のグラッフェン層を形成する工程と、
前記第2のグラッフェン層を介して多結晶SiC半導体基板を形成する工程と、
前記基礎となる単結晶基板を前記第1のグラッフェン層から剥離する工程と、
前記第1のグラッフェン層を除去し、前記第1層のC面を露出する工程と、
前記第1層のC面上に第2層をCVD成長により形成する工程と、
前記多結晶SiC半導体基板を剥離する工程と、
前記第2のグラッフェン層を除去する工程と
を有する、半導体基板の製造方法。 - 前記第1層をエピタキシャル成長させる工程は、前記基礎となる単結晶基板の上に前記第1層をリモートエピタキシーにより成長させる工程を有する、請求項9に記載の半導体基板の製造方法。
- 前記第1層の表面は、4H-SiCの[0001]方位のSi面であり、前記第1層のC面は、4H-SiCの[000-1]方位の面である、請求項9または10に記載の半導体基板の製造方法。
- 前記第2層をCVDで成長させる工程は、多結晶のSiC半導体で形成された第2層を
形成する工程を有する、請求項9~11のいずれか1項に記載の半導体基板の製造方法。 - 前記第1層のC面を露出する工程後、前記第1層のC面に前記第1層よりも高不純物濃度の層を形成する工程を有する、請求項9~12のいずれか1項に記載の半導体基板の製造方法。
- 前記第1のグラッフェン層を介して単結晶のSiC半導体で形成された第1層をエピタキシャル成長させる工程は、エピタキシャル成長の初期段階において前記第1層よりも高不純物濃度の層を形成する工程を有する、請求項9~12のいずれか1項に記載の半導体基板の製造方法。
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