JP7103210B2 - シリコンエピタキシャルウェーハの製造方法及びシリコンエピタキシャルウェーハ - Google Patents
シリコンエピタキシャルウェーハの製造方法及びシリコンエピタキシャルウェーハ Download PDFInfo
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- JP7103210B2 JP7103210B2 JP2018245106A JP2018245106A JP7103210B2 JP 7103210 B2 JP7103210 B2 JP 7103210B2 JP 2018245106 A JP2018245106 A JP 2018245106A JP 2018245106 A JP2018245106 A JP 2018245106A JP 7103210 B2 JP7103210 B2 JP 7103210B2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 52
- 229910052710 silicon Inorganic materials 0.000 title claims description 52
- 239000010703 silicon Substances 0.000 title claims description 52
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000013078 crystal Substances 0.000 claims description 26
- 230000007547 defect Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 238000005498 polishing Methods 0.000 claims description 16
- 230000003746 surface roughness Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- 239000006061 abrasive grain Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 235000012431 wafers Nutrition 0.000 description 69
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001947 vapour-phase growth Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- 239000005046 Chlorosilane Substances 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000022233 establishment of spindle orientation Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
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Description
前記シリコン単結晶ウェーハの温度を1140℃~1165℃とし、0.5μm/分~1.7μm/分の成長速度で前記エピタキシャル層を気相成長させるシリコンエピタキシャルウェーハの製造方法である。
微分干渉コントラスト法を用いて観察される、前記エピタキシャル層の表面の微小段差欠陥が、1.5個/300mmウェーハ以下であり、
白色顕微鏡を用いて観察される、前記エピタキシャル層の表面粗さのPV値が、10nm未満であるシリコンエピタキシャルウェーハである。
/分~1165℃×1.7μm/分の範囲である。ウェーハの温度は、気相成長装置のチャンバ内に投入されたウェーハの実温度であり、加熱ランプへの供給電力などにより制御される。また、エピタキシャル層の成長速度は、ウェーハの主面に形成されるエピタキシャル層の単位時間当たりの膜厚であり、気相成長装置のチャンバ内に供給する反応ガス(たとえば四塩化ケイ素SiCl4やトリクロロシランSiHCl3など)の単位時間当たりの濃度(原料ガスの濃度と流量)により制御される。
CZ法を用いたシリコン単結晶引き上げ装置により、主軸方位が<110>、直径305mmのp型シリコン単結晶インゴットを製造した。このインゴットを、直径300mmに外周研削した後、ノッチ加工を施し、抵抗率が1~100mΩcmのブロックを複数切り出した。このブロックを、ワイヤーソーを用い、{110}面の傾きが、傾斜方位<100>に対するオフアングル0度と0.35度となるようにスライスした。
エピタキシャル層の表面の微小段差欠陥密度の測定は、微分干渉コントラスト(Differential Interference Contrast、DIC)法により測定した。具体的には、ウェーハ表面検査装置(KLA-Tencor社製、Surfscan SP3)を用いて、DICモード(DIC法による測定モード)により測定した。測定にあたって、凹凸形状の段差状微小欠陥の高さの閾値を3nmに設定し、この閾値を超える段差状微小欠陥の個数(300mmウェーハ1枚当たり)を求めた。
エピタキシャル層の表面の粗さを示すPV値(Peak to Valley)は、白色顕微鏡により求めた。白色顕微鏡は、LEDビームをハーフミラーで分け、参照面と試料面に照射するとともに、これをZ方向に振りながら、参照面から戻ってきたビームと試料面から戻ってきたビームとの干渉が一番強くなるところを焦点位置として結像し、3D像を得るものである。
エピタキシャル層の表面のヘイズ値の測定は、表面検査装置(KLA-Tencor社製、Surfscan SP2)を用いて、DWOモード(Dark Field Wide Obliqueモード、暗視野ワイド斜め入射モード)により測定した。
表1の実施例1~6に示すように、上述した結晶面を有するシリコン単結晶ウェーハの主面に、エピタキシャル層を気相成長させるにあたり、ウェーハの温度とエピタキシャル層の成長速度とを、ウェーハの温度を1140℃~1165℃とし、エピタキシャル層の成長速度を0.5μm/分~1.7μm/分とする条件で行うと、DIC欠陥密度を300mmウェーハ1枚当たり1.5個以下にすることができるとともに、表面粗さのPV値を10nm未満にすることができる。このとき、シリコン単結晶ウェーハの主面が、{110}面からのオフアングルが0度超、1度未満の面、具体的には0.35度であるウェーハについては、表面粗さのPV値を4nm以下までさらに向上させることができる。
Claims (8)
- {110}面、又は{110}面からのオフアングルが1度未満の面を主面とするシリコン単結晶ウェーハの前記主面に、エピタキシャル層を気相成長させるシリコンエピタキシャルウェーハの製造方法において、
前記シリコン単結晶ウェーハの温度を1140℃~1165℃とし、0.5μm/分~1.7μm/分の成長速度で前記エピタキシャル層を気相成長させるシリコンエピタキシャルウェーハの製造方法。 - シリコン単結晶ウェーハの主面は、{110}面からのオフアングルが0度超、1度未満の面である請求項1に記載のシリコンエピタキシャルウェーハの製造方法。
- 前記エピタキシャル層を気相成長させたのち、前記エピタキシャル層の表面を鏡面研磨する請求項1又は2に記載のシリコンエピタキシャルウェーハの製造方法。
- 粒径が20nm以下の砥粒を含む研磨液を用いて、研磨代を0超、0.2μm以下として鏡面研磨する請求項3に記載のシリコンエピタキシャルウェーハの製造方法。
- {110}面、又は{110}面からのオフアングルが1度未満の面を主面とするシリコン単結晶基板にエピタキシャル層を成長させたシリコンエピタキシャルウェーハであって、
微分干渉コントラスト法を用いて観察される、前記エピタキシャル層の表面の微小段差欠陥が、1.5個/300mmウェーハ以下であり、
白色顕微鏡を用いて観察される、前記エピタキシャル層の表面粗さのPV値が、10nm未満であるシリコンエピタキシャルウェーハ。 - シリコン単結晶基板の主面は、{110}面からのオフアングルが0度超、1度未満の面である請求項5に記載のシリコンエピタキシャルウェーハ。
- 前記エピタキシャル層の表面のヘイズレベル(SP2,DWOモードで測定)が0.4ppm以下である請求項5又は6に記載のシリコンエピタキシャルウェーハ。
- 前記シリコン単結晶基板は、ボロンが添加され、抵抗率が1mΩ・cm~100mΩ・cmに調整されたウェーハである請求項5~7のいずれか一項に記載のシリコンエピタキシャルウェーハ。
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