JP4008401B2 - 基板載置台の製造方法 - Google Patents
基板載置台の製造方法 Download PDFInfo
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- JP4008401B2 JP4008401B2 JP2003330493A JP2003330493A JP4008401B2 JP 4008401 B2 JP4008401 B2 JP 4008401B2 JP 2003330493 A JP2003330493 A JP 2003330493A JP 2003330493 A JP2003330493 A JP 2003330493A JP 4008401 B2 JP4008401 B2 JP 4008401B2
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Description
例えば、セラミックスヒータや静電チャックは、ウエハの形状に応じた円盤状のセラミックス基体中に線状、板状、または膜状の電極を埋設したものであり、基板温度を所定温度に設定するため、あるいはクーロン力やジョンソン・ラーベック力により、ウエハを基板載置台上に吸着固定するために使用される。
また、上記接合層は、第1のアルミニウム合金層と、第2のアルミニウム合金層と、第1及び第2のアルミニウム合金層の間に挟持された金属板とを有してもよい。この金属板としては、熱膨張係数の小さいモリブデン、タングステン、あるいはコバールを使用することが好ましい。
上記コンポジット材としては、窒化アルミニウム、炭化珪素、アルミナ、窒化珪素、及びサイアロンのいずれかのセラミックスとアルミニウムのコンポジット材を使用してもよい。
図1は、本実施の形態に係る基板載置台の構造例を示す装置断面図である。ここでは、セラミックス基体10が静電チャック機能を有する基板載置台1を例示する。基板載置台1は静電チャック2と冷却部材3から構成される。セラミックス基体10は、固定するウエハの大きさ、形状にあわせて、例えばφ80〜φ300mmの円盤形状を有し、板状の電極12を埋設している。なお、電極12からは端子(図示せず)が外部に引き出されている。電極12に近接する一方の面が、ウエハ吸着面、即ち基板載置面に相当し、例えば図1に示すように、ウエハ40は、オーバハングする形態で、ウエハ面積よりやや小さい面積を持つ基板載置面上に吸着固定される。
次に、本実施の形態に係る基板載置台の製造方法について説明する。まず、セラミックス基体と冷却部材をそれぞれ作製する。
(実施例1〜3)
まず、静電チャック機能を持つセラミックス基体を作製した。すなわち、還元窒化法によって得られた窒化アルミニウム粉末に、アクリル系樹脂バインダを添加し、噴霧造粒法により造粒顆粒を作製した。この造粒顆粒を金型を用いて、一軸加圧成形を行った。なお、この成形に際して、成形体中に板状のメッシュ電極であるMoバルク電極を埋設させた。この成形体をホットプレス焼成し、一体焼結品を作製した。なお、ホットプレス時の圧力は200kg/cm2とし、焼成時は、最高温度である1900℃まで10℃/時間の昇温速度で温度を上昇させ、この最高温度条件を1時間保持した。こうして、Φ200mm、厚み10mmの円盤状窒化アルミニウムセラミックス基体を作製した。なお、焼成後のセラミックス基体には、中心軸から半径90mmの円弧上の3箇所に外径Φ5mmの貫通穴を形成した。
セラミックス基体とコンポジット材との接合温度を、Al合金の液相線温度より9℃高い600℃とした。すなわち、ろう付けによる接合をおこなった。それ以外の条件は、実施例1〜3と同様な条件を用いた。
比較例1と同様に、セラミックス基体とコンポジット材との接合温度を、Al合金の液相線温度より9℃高い600℃とした。ただし、セラミックス基体の接合面へのAl合金の濡れ性を改善するため、予め接合面にTi層をスパッタ法により形成し、その後接合を行った。これ以外の条件は実施例1〜3と同様の条件を用いた。
比較例2と同様に、セラミックス基体の接合面へのAl合金の濡れ性を改善するため、予め接合面にTi層をスパッタ法により形成し、その後600℃で、接合を行った。ただし、接合時のプレス荷重を、1/100、すなわち1kg/cm2(9.8×104Pa)とし、Al合金の薄層化の防止を試みた。これ以外の条件は実施例1〜3と同様の条件を用いた。
接合層材料として、Al合金ペースト(JISAC9B)を使用した。また、接合時の温度は、Al合金粉ペーストの液相線温度570℃より高い600℃とし、接合時のプレス荷重は1kg/cm2(9.8×104Pa)とした。それ以外の条件は、実施例1〜3と同様な条件を用いた。
Mo板を、実施例1のコンポジット材と同じ形状に加工し、冷却部材として使用した。それ以外の条件は実施例1と同様な条件を用いた。
各実施例、比較例の基板載置台について、接合後のa)接合層の厚み、b)基板載置台のそり、c)接合面における欠陥面積、及びd)接合部のシール性について評価した。
2・・・静電チャック
3・・・冷却部材
10・・・セラミックス基体
12・・・電極
20・・・接合層
21,22・・・Al合金層
25・・・金属板
30・・・コンポジット材
35・・・冷媒流路
40・・・ウエハ
Claims (5)
- 一方の面に基板載置面を持つ、窒化アルミニウムを主成分とする板状のセラミックス基体と、炭化珪素とアルミニウムとのコンポジット材で形成された板状の冷却部材とを準備する工程と、
前記セラミックス基体と前記冷却部材との間にSi及びMgを含有するアルミニウム合金層を含む接合材を挿入し、前記接合材の固相線温度TS℃以下、(TS−30)℃以上の加熱条件で、前記セラミックス基体及び前記冷却部材との接合面に対し略垂直方向に4.9MPa以上19.6MPa以下の圧力をかけ、接合後の前記アルミニウム合金層の厚みが50μm以上200μm以下となるように、前記セラミックス基体と前記冷却部材とを前記接合材を介して接合する工程と
を有することを特徴とする基板載置台の製造方法。 - 接合後の前記アルミニウム合金層の厚みを100μm以上150μm以下とすることを特徴とする請求項1に記載の基板載置台の製造方法。
- 前記接合材は、第1のアルミニウム合金層と、第2のアルミニウム合金層と、前記第1
及び第2のアルミニウム合金層の間に挟持された、金属板とを有する積層体であることを特徴とする請求項1〜3のいずれか1項に記載の基板載置台の製造方法。 - 前記金属板は、モリブデン、タングステン、及びコバールからなる群から選択されるいずれかの金属であることを特徴とする請求項1に記載の基板載置台の製造方法。
- 前記セラミックス基体は、膜状、板状もしくは線状の電極を埋設しており、少なくとも前記電極は、静電チャック、ヒータ、もしくは高周波プラズマ発生用電極として機能することを特徴とする請求項1又は請求項2に記載の基板載置台の製造方法。
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