JP5653519B2 - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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- JP5653519B2 JP5653519B2 JP2013521487A JP2013521487A JP5653519B2 JP 5653519 B2 JP5653519 B2 JP 5653519B2 JP 2013521487 A JP2013521487 A JP 2013521487A JP 2013521487 A JP2013521487 A JP 2013521487A JP 5653519 B2 JP5653519 B2 JP 5653519B2
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- compressive stress
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Description
また、本発明の別の態様に関する半導体装置は、第1導電型の炭化珪素半導体基板と、前記炭化珪素半導体基板上に形成された、第1導電型の炭化珪素ドリフト層と、前記炭化珪素ドリフト層表層に互いに離間して形成されて複数のユニットセルを構成する、第2導電型の第1ウェル領域と、各前記第1ウェル領域表層に選択的に形成された第1導電型のソース領域と、少なくとも前記炭化珪素ドリフト層と、各前記第1ウェル領域と、前記ソース領域との上に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に選択的に形成されたゲート電極と、前記ゲート絶縁膜を貫通して、前記ソース領域内部まで到達するソースコンタクトホールと、前記ソースコンタクトホールの少なくとも側面に形成された、圧縮応力が残留する圧縮応力残留層とを備え、前記圧縮応力残留層が、前記ソースコンタクトホールの底面にも形成され、前記ゲート絶縁膜及び前記ゲート電極を覆って形成された層間絶縁膜をさらに備え、前記圧縮応力残留層が、前記層間絶縁膜上面にも形成され、前記圧縮応力残留層が、Tiを含む1層以上の積層膜から成ることを特徴とする。
また、本発明の別の態様に関する半導体装置によれば、第1導電型の炭化珪素半導体基板と、前記炭化珪素半導体基板上に形成された、第1導電型の炭化珪素ドリフト層と、前記炭化珪素ドリフト層表層に互いに離間して形成されて複数のユニットセルを構成する、第2導電型の第1ウェル領域と、各前記第1ウェル領域表層に選択的に形成された第1導電型のソース領域と、少なくとも前記炭化珪素ドリフト層と、各前記第1ウェル領域と、前記ソース領域との上に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に選択的に形成されたゲート電極と、前記ゲート絶縁膜を貫通して、前記ソース領域内部まで到達するソースコンタクトホールと、前記ソースコンタクトホールの少なくとも側面に形成された、圧縮応力が残留する圧縮応力残留層とを備え、前記圧縮応力残留層が、前記ソースコンタクトホールの底面にも形成され、前記ゲート絶縁膜及び前記ゲート電極を覆って形成された層間絶縁膜をさらに備え、前記圧縮応力残留層が、前記層間絶縁膜上面にも形成され、前記圧縮応力残留層が、Tiを含む1層以上の積層膜から成ることにより、ゲート電極におけるしきい値電圧の経時変化を抑制することができる。
<A−1.構成>
図1は、本発明にかかる半導体装置を上面から見た平面模式図である。本実施の形態では特に電力用半導体装置として、炭化珪素を基板に用いたMOSFET(Metal−Oxide−Semiconductor Field−Effect Transistor)を例に示す。
次に、図5及び図6を用いて、本発明にかかる半導体装置の製造方法を説明する。図5及び図6は特に、電力用半導体装置の製造工程を説明する、電力用半導体装置の一部を模式的に表した断面図である。
図11は、MOSFETのゲート電極に対し−20Vの電圧(負バイアス)印加を行い、また、その状態でしきい値電圧の測定を繰り返すことによって得た、しきい値電圧の経時変化の様子である。
本発明にかかる実施の形態によれば、半導体装置において、半導体基板20上に形成されたドリフト層21と、ドリフト層21表層に互いに離間して形成された第1ウェル領域41と、ドリフト層21及び各第1ウェル領域41の上に跨って形成されたゲート絶縁膜30と、ゲート絶縁膜30上に選択的に形成されたゲート電極50と、ゲート絶縁膜30を貫通して、各第1ウェル領域41内部まで到達するソースコンタクトホール61と、ソースコンタクトホール61の少なくとも側面に形成された、圧縮応力が残留する圧縮応力残留層90とを備えることで、ゲート絶縁膜30(二酸化珪素)と半導体層との間の格子不整合を緩和し、しきい値電圧の変動を低減することが可能となる。
<B−1.構成>
図8(a)は、図2の平面模式図のA−A’部分の断面を模式的に表した変形図であり、図8(b)は、図2の平面模式図のB−B’部分の断面を模式的に表した変形図である。
この作成方法を、以下に述べる。「ソースコンタクトホール61及びウェルコンタクトホール62内に形成されたシリサイドと、後に形成される金属電極との接触抵抗を低減するために、シリサイド上に熱工程で形成された酸化物を、逆スパッタエッチングによって除去する」工程(逆スパッタエッチング工程)までは、実施の形態1と同様である。
本発明にかかる実施の形態によれば、半導体装置において、圧縮応力残留層としての役割を果たすプラグ91が、ソースコンタクトホール61の底面に形成されることで、コンタクトホール内に積層構造を形成する必要がなく、より小さいコンタクトホールに対しても、コンタクトホールの側面、すなわち、層間絶縁膜32の側面に圧縮応力が残留した膜(又は層)を形成することができる。
<C−1.構成>
図9(a)は、図2の平面模式図のA−A’部分の断面を模式的に表した変形図であり、図9(b)は、図2の平面模式図のB−B’部分の断面を模式的に表した変形図である。
この作成方法を、以下に述べる。「ソースコンタクトホール61及びウェルコンタクトホール62内に形成されたシリサイドと、後に形成される金属電極との接触抵抗を低減するために、シリサイド上に熱工程で形成された酸化物を、逆スパッタエッチングによって除去する」工程(逆スパッタエッチング工程)までは、実施の形態1と同様である。
本発明にかかる実施の形態によれば、半導体装置において、ゲート絶縁膜30及びゲート電極50を覆って形成された層間絶縁膜32をさらに備え、圧縮応力残留層の役割を果たす単一層100が、層間絶縁膜32上面にも形成されることで、半導体装置を作製する工程数が削減され、コストが低減する。
<D−1.構成>
図10(a)は、図2の平面模式図のA−A’部分の断面を模式的に表した変形図であり、図10(b)は、図2の平面模式図のB−B’部分の断面を模式的に表した変形図である。
この作成方法を、以下に述べる。「ソースコンタクトホール61及びウェルコンタクトホール62内に形成されたシリサイドと、後に形成される金属電極との接触抵抗を低減するために、シリサイド上に熱工程で形成された酸化物を、逆スパッタエッチングによって除去する」工程(逆スパッタエッチング工程)までは、実施の形態1と同様である。
本発明にかかる実施の形態によれば、半導体装置において、圧縮応力残留層92は、ソースコンタクトホール61の底面に形成され、圧縮応力残留層92上に、圧縮応力残留層92とは異なる電極材料で形成されたソースパッド102が積層されたことで、圧縮応力残留層92と、ソースパッド102、ゲートパッド、ゲート配線104のそれぞれとを、別々に選択することができる。
Claims (13)
- 第1導電型の炭化珪素半導体基板(20)と、
前記炭化珪素半導体基板(20)上に形成された、第1導電型の炭化珪素ドリフト層(21)と、
前記炭化珪素ドリフト層(21)表層に互いに離間して形成されて複数のユニットセルを構成する、第2導電型の第1ウェル領域(41)と、
各前記第1ウェル領域(41)表層に選択的に形成された第1導電型のソース領域(80)と、
少なくとも前記炭化珪素ドリフト層(21)と、各前記第1ウェル領域(41)と、前記ソース領域(80)との上に形成されたゲート絶縁膜(30)と、
前記ゲート絶縁膜(30)上に選択的に形成されたゲート電極(50)と、
前記ゲート絶縁膜(30)を貫通して、前記ソース領域(80)内部まで到達するソースコンタクトホール(61)と、
前記ソースコンタクトホール(61)の少なくとも側面に形成された、圧縮応力が残留する圧縮応力残留層(90)とを備えることを特徴とする、
半導体装置。 - 前記ソースコンタクトホール(61)が、前記ソース領域(80)内部の、前記炭化珪素ドリフト層(21)表面からの深さが5nmより深い深度まで到達することを特徴とする、
請求項1に記載の半導体装置。 - 各前記第1ウェル領域(41)表層に選択的に形成され、前記ソース領域(80)に平面視上囲まれた、第2導電型のウェルコンタクト領域(46)をさらに備え、
前記ソースコンタクトホール(61)が、前記ウェルコンタクト領域(46)内部の、前記炭化珪素ドリフト層(21)表面からの深さが5nmより深い深度まで到達することを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記圧縮応力残留層(91、92、100)が、前記ソースコンタクトホール(61)の底面に形成されることを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記ゲート絶縁膜(30)及び前記ゲート電極(50)を覆って形成された層間絶縁膜(32)をさらに備え、
前記圧縮応力残留層(92、100)が、前記層間絶縁膜(32)上面にも形成されることを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記圧縮応力残留層(92)は、前記ソースコンタクトホール(61)の底面に形成され、
前記圧縮応力残留層(92)上に、前記圧縮応力残留層(92)とは異なる電極材料(102)が積層されたことを特徴とする、
請求項5に記載の半導体装置。 - 複数の前記ユニットセルが配置されたセル領域と、
前記炭化珪素ドリフト層(21)表層において、前記セル領域を平面視上囲んで形成された、第2導電型の第2ウェル領域(42)とをさらに備え、
前記ゲート絶縁膜(30)は、前記第2ウェル領域(42)上に延在して形成されることを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記炭化珪素ドリフト層(21)上において、前記ゲート絶縁膜(30)を平面視上囲んで形成された、フィールド絶縁膜(31)をさらに備え、
前記ゲート電極(50)は、前記フィールド絶縁膜(31)上に延在して形成され、
前記フィールド絶縁膜(31)上の前記ゲート電極(50)に到達する、ゲートコンタクトホール(64)をさらに備え、
前記圧縮応力残留層(90)が、前記ソースコンタクトホール(61)において形成された態様に対応して、前記ゲートコンタクトホール(64)においても形成されることを特徴とする、
請求項7に記載の半導体装置。 - 前記圧縮応力残留層(90)に、32MPa以上の圧縮応力が残留することを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記圧縮応力残留層(90)が、Tiを含む1層以上の積層膜から成ることを特徴とする、
請求項1又は2に記載の半導体装置。 - 前記圧縮応力残留層(90)が、Alを含む層およびTiを含む層を備える積層膜から成ることを特徴とする、
請求項1又は2に記載の半導体装置。 - 請求項2に記載の半導体装置の製造方法であって、
前記ソース領域(80)内部の、前記炭化珪素ドリフト層(21)表面からの深さが5nmより深い深度まで到達するように、前記ソースコンタクトホール(61)をエッチング形成する工程を備えることを特徴とする、
半導体装置の製造方法。 - 第1導電型の炭化珪素半導体基板(20)と、
前記炭化珪素半導体基板(20)上に形成された、第1導電型の炭化珪素ドリフト層(21)と、
前記炭化珪素ドリフト層(21)表層に互いに離間して形成されて複数のユニットセルを構成する、第2導電型の第1ウェル領域(41)と、
各前記第1ウェル領域(41)表層に選択的に形成された第1導電型のソース領域(80)と、
少なくとも前記炭化珪素ドリフト層(21)と、各前記第1ウェル領域(41)と、前記ソース領域(80)との上に形成されたゲート絶縁膜(30)と、
前記ゲート絶縁膜(30)上に選択的に形成されたゲート電極(50)と、
前記ゲート絶縁膜(30)を貫通して、前記ソース領域(80)内部まで到達するソースコンタクトホール(61)と、
前記ソースコンタクトホール(61)の少なくとも側面に形成された、圧縮応力が残留する圧縮応力残留層(90)とを備え、
前記圧縮応力残留層(91、92、100)が、前記ソースコンタクトホール(61)の底面にも形成され、
前記ゲート絶縁膜(30)及び前記ゲート電極(50)を覆って形成された層間絶縁膜(32)をさらに備え、
前記圧縮応力残留層(92、100)が、前記層間絶縁膜(32)上面にも形成され、
前記圧縮応力残留層(90)が、Tiを含む1層以上の積層膜から成ることを特徴とする、
半導体装置。
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