JP2022104908A - 研磨パッド、研磨パッドの製造方法及びこれを用いた半導体素子の製造方法 - Google Patents
研磨パッド、研磨パッドの製造方法及びこれを用いた半導体素子の製造方法 Download PDFInfo
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- JP2022104908A JP2022104908A JP2021213483A JP2021213483A JP2022104908A JP 2022104908 A JP2022104908 A JP 2022104908A JP 2021213483 A JP2021213483 A JP 2021213483A JP 2021213483 A JP2021213483 A JP 2021213483A JP 2022104908 A JP2022104908 A JP 2022104908A
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- polishing
- polishing pad
- spk
- foaming agent
- polishing layer
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Abstract
Description
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。
[式1]
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。
[式1]
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨層の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハに対して、前記研磨パッドを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後に測定した研磨層の研磨面に対するSpkである。
研磨パッドの製造
TDI、H12MDI、ポリテトラメチレンエテルグリコール(Polytetramethylene ether glycol)及びジエチレングリコール(Diethylene glycol)を4口フラスコに投入後、80℃で3時間反応させてNCO%が8~12%であるプレポリマー(Prepolymer)を製造した。
TDI、H12MDI、ポリテトラメチレンエテルグリコール(Polytetramethylene ether glycol)及びジエチレングリコール(Diethylene glycol)を4口フラスコに投入後、80℃で3時間反応させてNCO%が8~12%であるプレポリマー(Prepolymer)を製造した。
TDI、H12MDI、ポリテトラメチレンエテルグリコール(Polytetramethylene ether glycol)及びジエチレングリコール(Diethylene glycol)を4口フラスコに投入後、80℃で3時間反応させてNCO%が8~12%であるプレポリマー(Prepolymer)を製造した。
TDI、H12MDI、ポリテトラメチレンエテルグリコール(Polytetramethylene ether glycol)及びジエチレングリコール(Diethylene glycol)を4口フラスコに投入後、80℃で3時間反応させてNCO%が8~12%であるプレポリマー(Prepolymer)を製造した。
触媒使用量を、下記表1のように、実施例1と異ならせたことを除き、同一に製造した。
研磨層の物性評価
(1)硬度
研磨性能測定
研磨率(Removal Rate)測定方法
CMP研磨(polishing)装備を使用し、CVD工程によりシリコーンオキサイドが蒸着された直径300mmのシリコーンウエハを設けた後、シリコーンウエハのシリコーンオキサイド層を下にして前記実施例及び比較例の研磨パッドを付着した定盤上にセットした。以後、研磨荷重が4.0psiとなるように調整し、150rpmで研磨パッドを回転させながら、研磨パッド上にか焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、定盤を150rpmで60秒間回転させて酸化ケイ素膜を研磨した。研磨後のシリコーンウエハをキャリアから取り外し、スピンドライヤー(spin dryer)に取り付け、精製水(DIW)で洗浄した後、窒素で15秒間乾燥した。乾燥したシリコーンウエハを光干渉式厚さ測定装置(製造社:Kyence社、モデル:SI-F80R)を使用して研磨前後の膜厚さの変化を測定した。以後、下記式1を使用して研磨率を計算した。
研磨率=シリコーンウエハの研磨厚さ(A)/研磨時間(60秒)
CMP研磨(polishing)装備を使用し、研磨率測定方法と同一に研磨を行った。研磨後のシリコーンウエハをクリーナー(Cleaner)に移動させ、1%HF及び精製水(DIW)と1%H2NO3及び精製水(DIW)をそれぞれ使用して10秒ずつ洗浄した。以後、スピンドライヤー(spin dryer)に移動させて精製水(DIW)で洗浄した後、窒素で15秒間乾燥した。乾燥したシリコーンウエハを欠陥測定装備(製造社:Tenkor社、モデル:XP+)を使用して研磨前後の欠陥変化を測定した。
11:非膨脹した粒子の外被
12:膨脹誘発成分
20:膨脹した粒子
30:硬化工程
40:研磨層内の気孔
110:研磨パッド
120:定盤
130:半導体基板
140:ノズル
150:研磨スラリー
160:研磨ヘッド
170:コンディショナー
Claims (10)
- 研磨層を含み、
前記研磨層の研磨面は、下記式1によるSpk減少率が5~25%である、研磨パッド。
[式1]
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。 - 前記研磨層は、複数の気孔を含み、
前記気孔のD10は、10~20μmであり、D50は、15~30μmであり、D90は、20~45μmである、請求項1に記載の研磨パッド。 - 前記研磨層は、プレポリマー組成物、発泡剤、硬化剤及び触媒を含む研磨層製造用組成物の硬化物を含む、請求項1に記載の研磨パッド。
- 前記発泡剤は、非膨脹した(Unexpanded)固相発泡剤であり、
前記非膨脹した固相発泡剤は、樹脂材質の外被及び前記外被の内部に封入された膨脹誘発成分を含む、請求項3に記載の研磨パッド。 - 前記触媒は、アミン系触媒、ビスマス系金属触媒、Sn系金属触媒及びこれらの混合からなる群より選択される、請求項3に記載の研磨パッド。
- i)プレポリマー組成物を製造するステップ;
ii)前記プレポリマー組成物、発泡剤、硬化剤及び触媒を含む研磨層製造用組成物を製造するステップ;及び
iii)前記研磨層製造用組成物を硬化して研磨層を製造するステップ;を含み、
前記研磨層の研磨面は、下記式1によるSpk減少率が5~25%である、研磨パッドの製造方法。
[式1]
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。 - 前記発泡剤は、非膨脹した(Unexpanded)固相発泡剤であり、
前記iii)ステップの硬化工程により膨脹して均一な大きさで複数の気孔を形成する、請求項6に記載の研磨パッドの製造方法。 - 前記触媒は、アミン系触媒、ビスマス系金属触媒、Sn系金属触媒及びこれらの混合からなる群より選択される、請求項6に記載の研磨パッドの製造方法。
- 前記触媒は、プレポリマー組成物100重量部に対して、0.001~0.01重量部で含む、請求項6に記載の研磨パッドの製造方法。
- 1)研磨層を含む研磨パッドを提供するステップ;及び
2)前記研磨層の研磨面に半導体基板の被研磨面が当接するように相対回転させながら、前記半導体基板を研磨させるステップ;を含み、
前記研磨層の研磨面は、下記式1によるSpk減少率が5~25%である、半導体素子の製造方法。
[式1]
ここで、
Spkは、表面粗さに対する3次元パラメータに関するものであり、全表面粗さに対する高さをグラフで表した後、突き出るピークの平均高さを意味し、
初期Spkは、研磨工程前の研磨面に対するSpkであり、
研磨後のSpkは、シリコーンオキサイドが蒸着された300mm直径のシリコーンウエハを定盤に付着した後、研磨荷重が4.0psiであり、研磨パッドの回転速度が150rpmであり、か焼セリアスラリーセリアスラリーを250ml/分の速度で投入し、60秒間研磨工程後の研磨面に対するSpkである。
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