JP5845866B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5845866B2 JP5845866B2 JP2011268359A JP2011268359A JP5845866B2 JP 5845866 B2 JP5845866 B2 JP 5845866B2 JP 2011268359 A JP2011268359 A JP 2011268359A JP 2011268359 A JP2011268359 A JP 2011268359A JP 5845866 B2 JP5845866 B2 JP 5845866B2
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- metal oxide
- ferroelectric
- transition metal
- conductive
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- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
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- H01L28/56—Capacitors with a dielectric comprising a perovskite structure material the dielectric comprising two or more layers, e.g. comprising buffer layers, seed layers, gradient layers
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- H01L28/60—Electrodes
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Description
図2〜図13は、本実施形態に係る半導体装置の製造途中の断面図である。
上記した第1実施形態では遷移金属酸化物材料膜34(図4(a)参照)を形成することにより、強誘電体キャパシタQの反転電荷量やインプリント特性等の電気的特性を改善した。
第1実施形態と第2実施形態では、半導体装置としてプレーナ型のFeRAMを製造した。これに対し、本実施形態では、プレーナ型よりも微細化に有利なスタック型のFeRAMを半導体装置として製造する。
前記絶縁膜の上に導電膜を形成する工程と、
前記導電膜の上に第1の強誘電体膜を形成する工程と、
前記第1の強誘電体膜の上に非晶質の第2の強誘電体膜を形成する工程と、
前記第2の強誘電体膜の上に、ルテニウムを含む遷移金属酸化物材料膜を形成する工程と、
前記遷移金属酸化物材料膜を大気に曝すことなしに、前記遷移金属酸化物材料膜の上に第1の導電性酸化金属膜を形成する工程と、
前記第1の導電性酸化金属膜を形成した後、前記第2の強誘電体膜をアニールして結晶化する工程と、
前記第1の導電性酸化金属膜をパターニングして強誘電体キャパシタの上部電極にする工程と、
前記第1の強誘電体膜と前記第2の強誘電体膜とをパターニングして前記強誘電体キャパシタのキャパシタ誘電体膜にする工程と、
前記導電膜をパターニングして前記強誘電体キャパシタの下部電極にする工程と、
を有することを特徴とする半導体装置の製造方法。
前記絶縁膜の上に導電膜を形成する工程と、
前記導電膜の上に第1の強誘電体膜を形成する工程と、
前記第1の強誘電体膜の上に、イリジウム及びルテニウムを含む非晶質の第2の強誘電体膜を形成する工程と、
前記第2の強誘電体膜の上に第1の導電性酸化金属膜を形成する工程と、
前記第1の導電性酸化金属膜を形成した後、前記第2の強誘電体膜をアニールして結晶化する工程と、
前記第1の導電性酸化金属膜をパターニングして強誘電体キャパシタの上部電極にする工程と、
前記第1の強誘電体膜と前記第2の強誘電体膜とをパターニングして前記強誘電体キャパシタのキャパシタ誘電体膜にする工程と、
前記導電膜をパターニングして前記強誘電体キャパシタの下部電極にする工程と、
を有することを特徴とする半導体装置の製造方法。
Claims (7)
- 半導体基板の上に絶縁膜を形成する工程と、
前記絶縁膜の上に導電膜を形成する工程と、
前記導電膜の上に第1の強誘電体膜を形成する工程と、
前記第1の強誘電体膜の上に非晶質の第2の強誘電体膜を形成する工程と、
前記第2の強誘電体膜の上に、ルテニウムを含む遷移金属酸化物材料膜を形成する工程と、
前記遷移金属酸化物材料膜を大気に曝すことなしに、前記遷移金属酸化物材料膜の上に第1の導電性酸化金属膜を形成する工程と、
前記第1の導電性酸化金属膜を形成した後、前記第2の強誘電体膜をアニールして結晶化する工程と、
前記第1の導電性酸化金属膜をパターニングしてキャパシタの上部電極にする工程と、
前記第1の強誘電体膜と前記第2の強誘電体膜とをパターニングして前記キャパシタのキャパシタ誘電体膜にする工程と、
前記導電膜をパターニングして前記キャパシタの下部電極にする工程と、
を有し、
前記遷移金属酸化物材料膜の材料は、結晶化したときにABO 3 型のペロプスカイト構造の遷移金属酸化物となる材料であることを特徴とする半導体装置の製造方法。 - 前記遷移金属酸化物材料膜の前記材料は、SrRuO3、CaRuO3、BaRuO3、La4Ru2O10、LaSrCoRuO3、LaSrRuO3、及びLaSrMnRuO3のいずれかであることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記遷移金属酸化物材料膜を形成する工程において、スパッタ法により該遷移金属酸化物材料膜を形成することにより、前記遷移金属酸化物材料膜を成膜の時点で非晶質の状態とすることを特徴とする請求項1又は請求項2に記載の半導体装置の製造方法。
- 前記遷移金属酸化物材料膜を形成する工程において、酸化ビスマスが添加されたスパッタターゲットを使用することを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記遷移金属酸化物材料膜を形成する工程において、酸素を排除したスパッタガスを使用して前記スパッタ法を行うことを特徴とする請求項3又は請求項4に記載の半導体装置の製造方法。
- 前記遷移金属酸化物材料膜を形成する工程において、前記遷移金属酸化物材料膜を0.5nm以上3.0nm以下の膜厚に形成することを特徴とする請求項1乃至請求項5のいずれか1項に記載の半導体装置の製造方法。
- 前記第1の導電性酸化金属膜の上に、該第1の導電性酸化金属膜におけるよりも酸素の組成比が大きい第2の導電性酸化金属膜を形成する工程を更に有することを特徴とする請求項1乃至請求項6のいずれか1項に記載の半導体装置の製造方法。
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