JP5636867B2 - 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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- 239000004065 semiconductor Substances 0.000 title claims description 143
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 67
- 239000000758 substrate Substances 0.000 claims description 30
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
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- 238000005268 plasma chemical vapour deposition Methods 0.000 description 18
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 16
- 230000004888 barrier function Effects 0.000 description 16
- 230000015556 catabolic process Effects 0.000 description 16
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- 229910052760 oxygen Inorganic materials 0.000 description 7
- 229920002120 photoresistant polymer Polymers 0.000 description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
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- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 6
- 229910052746 lanthanum Inorganic materials 0.000 description 6
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 6
- 229910052715 tantalum Inorganic materials 0.000 description 6
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 6
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- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
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- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- 238000000927 vapour-phase epitaxy Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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Description
最初に、ゲート電極と半導体層との間に絶縁膜を形成した構造のトランジスタにおいて、保護膜として絶縁膜を形成した構造のトランジスタについて説明する。図1に示されるように、この構造のトランジスタは、HEMT(High Electron Mobility Transistor)と呼ばれるものであり、半導体等からなる基板11上に、電子走行層12、障壁層13、キャップ層14がエピタキシャル成長により積層して形成されている。また、障壁層13と接続されるソース電極15及びドレイン電極16が形成されており、キャップ層14上には、絶縁膜17が形成されており、絶縁膜17上にはゲート電極18が形成されている。更に、絶縁膜17を含む領域の全体を覆うように保護膜19が形成されている。
次に、本実施の形態における半導体装置の製造方法について図5から図7に基づき説明する。
次に、第2の実施の形態について説明する。本実施の形態における半導体装置の製造方法について、図8から図10に基づき説明する。
次に、第3の実施の形態について説明する。ところで、絶縁膜上に保護膜を形成することにより、耐圧が低下する理由としては、絶縁膜と保護膜との熱膨張率の差に起因する場合や、保護膜の成膜の際に生じる応力に起因する場合や、絶縁膜と保護膜との間等に水分が残留することに起因する場合が考えられる。
(付記1)
基板上に形成された第1の半導体層と、
前記第1の半導体層上に形成された第2の半導体層と、
前記第2の半導体層上に形成されたソース電極及びドレイン電極と、
前記第2の半導体層上に形成された絶縁膜と、
前記絶縁膜上に形成されたゲート電極と、
前記絶縁膜を覆うように形成された保護膜と、
を有し、
前記保護膜は、熱CVD、熱ALD、真空蒸着のいずれかにより形成されたものであることを特徴とする半導体装置。
(付記2)
基板上に形成された第1の半導体層と、
前記第1の半導体層上に形成された第2の半導体層と、
前記第2の半導体層上に形成されたソース電極及びドレイン電極と、
前記第2の半導体層または、前記第2の半導体層及び前記第1の半導体層に形成されたリセス開口部と、
前記第2の半導体層上及び前記リセス開口部内に形成された絶縁膜と、
前記リセス開口部内の前記絶縁膜上に形成されたゲート電極と、
前記絶縁膜を覆うように形成された保護膜と、
を有し、
前記保護膜は、熱CVD、熱ALD、真空蒸着のいずれかにより形成されたものであることを特徴とする半導体装置。
(付記3)
前記保護膜は、金属酸化膜であることを特徴とする付記1または2に記載の半導体装置。
(付記4)
前記保護膜は、シリコン、アルミニウム、ハフニウム、タンタル、ジルコニウム、イットリウム、ランタン、タンタルの酸化物、シリコン、アルミニウムの窒化物、または、シリコンの酸窒化物のうち、いずれか1または2以上の材料を含むものであることを特徴とする付記1から3のいずれか1項に記載の半導体装置。
(付記5)
前記保護膜は、多層膜により形成されていることを特徴とする付記1から4のいずれか1項に記載の半導体装置。
(付記6)
前記絶縁膜は金属酸化膜であることを特徴とする付記1から5のいずれか1項に記載の半導体装置。
(付記7)
前記絶縁膜は、シリコン、アルミニウム、ハフニウム、タンタル、ジルコニウム、イットリウム、ランタン、タンタルの酸化物、シリコン、アルミニウムの窒化物、または、シリコンの酸窒化物のうち、いずれか1または2以上の材料を含むものであることを特徴とする付記1から5のいずれか1項に記載の半導体装置。
(付記8)
前記絶縁膜は、プラズマCVD、プラズマALDまたはスパッタリングにより形成されたものであることを特徴とする付記1から7のいずれか1項に記載の半導体装置。
(付記9)
前記保護膜と前記絶縁膜は、同じ材料を含むものであることを特徴とする付記1から8のいずれか1項に記載の半導体装置。
(付記10)
前記第2の半導体層と前記絶縁膜との間には、第3の半導体層が設けられていることを特徴とする付記1から9のいずれか1項に記載の半導体装置。
(付記11)
基板上に第1の半導体層と、第2の半導体層を積層形成する工程と、
前記第2の半導体層上にソース電極及びドレイン電極を形成する工程と、
前記第2の半導体層上に絶縁膜を形成する工程と、
前記絶縁膜上にゲート電極を形成する工程と、
前記絶縁膜を覆うように熱CVD、熱ALD、真空蒸着のいずれかにより保護膜を形成する工程と、
を有することを特徴とする半導体装置の製造方法。
(付記12)
基板上に第1の半導体層と、第2の半導体層を積層形成する工程と、
前記第2の半導体層上にソース電極及びドレイン電極を形成する工程と、
前記第2の半導体層にリセス開口部を形成する工程と、
前記第2の半導体層の上方及び前記リセス開口部内に絶縁膜を形成する工程と、
前記リセス開口部内の前記絶縁膜上にゲート電極を形成する工程と、
前記絶縁膜を覆うように熱CVD、熱ALD、真空蒸着のいずれかにより保護膜を形成する工程と、
を有することを特徴とする半導体装置の製造方法。
(付記13)
前記保護膜を形成する工程は、トリメチルアルミニウムと水とを交互に供給することにより、熱ALDによって酸化アルミニウム膜を形成するものであることを特徴とする付記11または12に記載の半導体装置の製造方法。
(付記14)
前記保護膜を形成する工程は、
10nm以上、50nm以下の膜厚の金属酸化膜を成膜する工程と、
前記金属酸化膜を成膜後、500℃以上、800℃以下の温度で熱処理を行なう工程と、
を繰り返し行なうものであることを特徴とする付記11から13のいずれか1項に記載の半導体装置の製造方法。
12 電子走行層(第1の半導体層)
13 障壁層(第2の半導体層)
14 キャップ層
15 ソース電極
16 ドレイン電極
17 絶縁膜
18 ゲート電極
19 保護膜
20 保護膜
Claims (7)
- 基板上に形成された第1の半導体層と、
前記第1の半導体層上に形成された第2の半導体層と、
前記第2の半導体層上に形成されたソース電極及びドレイン電極と、
前記第2の半導体層上に形成された絶縁膜と、
前記絶縁膜上に形成されたゲート電極と、
前記絶縁膜を覆うように形成された保護膜と、
を有し、
前記保護膜は、トリメチルアルミニウムと水とを交互に供給することにより、熱ALDにより形成された酸化アルミニウム膜を含むものであることを特徴とする半導体装置。 - 基板上に形成された第1の半導体層と、
前記第1の半導体層上に形成された第2の半導体層と、
前記第2の半導体層上に形成されたソース電極及びドレイン電極と、
前記第2の半導体層または、前記第2の半導体層及び前記第1の半導体層に形成されたリセス開口部と、
前記第2の半導体層上及び前記リセス開口部内に形成された絶縁膜と、
前記リセス開口部内の前記絶縁膜上に形成されたゲート電極と、
前記絶縁膜を覆うように形成された保護膜と、
を有し、
前記保護膜は、トリメチルアルミニウムと水とを交互に供給することにより、熱ALDにより形成された酸化アルミニウム膜を含むものであることを特徴とする半導体装置。 - 前記保護膜は、多層膜により形成されていることを特徴とする請求項1または2に記載の半導体装置。
- 前記保護膜と前記絶縁膜は、同じ材料を含むものであることを特徴とする請求項1から3のいずれか1項に記載の半導体装置。
- 基板上に第1の半導体層と、第2の半導体層を積層形成する工程と、
前記第2の半導体層上にソース電極及びドレイン電極を形成する工程と、
前記第2の半導体層上に絶縁膜を形成する工程と、
前記絶縁膜上にゲート電極を形成する工程と、
前記絶縁膜を覆うように保護膜を形成する工程と、
を有し、
前記保護膜を形成する工程は、トリメチルアルミニウムと水とを交互に供給することにより、熱ALDによって酸化アルミニウム膜を形成するものであることを特徴とする半導体装置の製造方法。 - 基板上に第1の半導体層と、第2の半導体層を積層形成する工程と、
前記第2の半導体層上にソース電極及びドレイン電極を形成する工程と、
前記第2の半導体層にリセス開口部を形成する工程と、
前記第2の半導体層の上方及び前記リセス開口部内に絶縁膜を形成する工程と、
前記リセス開口部内の前記絶縁膜上にゲート電極を形成する工程と、
前記絶縁膜を覆うように保護膜を形成する工程と、
を有し、
前記保護膜を形成する工程は、トリメチルアルミニウムと水とを交互に供給することにより、熱ALDによって酸化アルミニウム膜を形成するものであることを特徴とする半導体装置の製造方法。 - 前記保護膜を形成する工程は、
10nm以上、50nm以下の膜厚の金属酸化膜を成膜する工程と、
前記金属酸化膜を成膜後、500℃以上、800℃以下の温度で熱処理を行なう工程と、
を繰り返し行なうものであることを特徴とする請求項5または6に記載の半導体装置の製造方法。
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WO2013046155A1 (en) * | 2011-09-27 | 2013-04-04 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Tungsten diazabutadiene precursors, their synthesis, and their use for tungsten containing film depositions |
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TWI487109B (zh) | 2015-06-01 |
JP2012089677A (ja) | 2012-05-10 |
CN102456730A (zh) | 2012-05-16 |
US20150279956A1 (en) | 2015-10-01 |
US9608083B2 (en) | 2017-03-28 |
US20120091522A1 (en) | 2012-04-19 |
CN102456730B (zh) | 2016-02-03 |
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