JP7485403B2 - 表面保護物質を用いた薄膜形成方法 - Google Patents
表面保護物質を用いた薄膜形成方法 Download PDFInfo
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- JP7485403B2 JP7485403B2 JP2022542096A JP2022542096A JP7485403B2 JP 7485403 B2 JP7485403 B2 JP 7485403B2 JP 2022542096 A JP2022542096 A JP 2022542096A JP 2022542096 A JP2022542096 A JP 2022542096A JP 7485403 B2 JP7485403 B2 JP 7485403B2
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- 239000000463 material Substances 0.000 title claims description 46
- 238000000034 method Methods 0.000 title claims description 44
- 239000010409 thin film Substances 0.000 title claims description 38
- 230000015572 biosynthetic process Effects 0.000 title claims description 7
- 239000002243 precursor Substances 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 39
- 239000002184 metal Substances 0.000 claims description 39
- 230000001681 protective effect Effects 0.000 claims description 31
- 125000004432 carbon atom Chemical group C* 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 15
- 239000000376 reactant Substances 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 9
- 125000005265 dialkylamine group Chemical group 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- 125000004414 alkyl thio group Chemical group 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052735 hafnium Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000010408 film Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 13
- 239000006227 byproduct Substances 0.000 description 8
- 125000001033 ether group Chemical group 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- LKUDPHPHKOZXCD-UHFFFAOYSA-N phloroglucinol trimethyl ether Natural products COC1=CC(OC)=CC(OC)=C1 LKUDPHPHKOZXCD-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- HDPNBNXLBDFELL-UHFFFAOYSA-N 1,1,1-trimethoxyethane Chemical compound COC(C)(OC)OC HDPNBNXLBDFELL-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
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Description
本発明の目的は,極めて薄い厚さの薄膜を形成することができる薄膜形成方法を提供することにある。
本発明の一実施例によれば,表面保護物質を用いた薄膜形成方法は,金属前駆体を基板が置かれたチャンバーの内部に供給し,前記金属前駆体を前記基板に吸着する金属前駆体供給段階;前記チャンバーの内部をパージする段階;前記チャンバーの内部に反応物質を供給して吸着された前記金属前駆体と反応して薄膜を形成する薄膜形成段階を含むが,前記方法は,前記薄膜形成段階の前に,前記表面保護物質を供給して前記基板に吸着する表面保護物質供給段階;前記チャンバーの内部をパージする段階を含んでいる。
本発明の一実施形態によれば,既存のALD工程によって得られる1つのモノレイヤー厚より薄く不純物なしで純度の高い薄膜を形成することができ,これにより非常に低い薄膜成長速度を有するので薄膜の厚さの調整が容易でステップカバレッジ制御が可能であるだけでなく,素子の電気的特性および信頼性を向上させることができる。
前述した表面保護物質を使用せずに,シリコン基板上にアルミニウム酸化膜を形成した。 ALD工程を使用してアルミニウム酸化膜を形成し,ALD工程温度は250~390℃,反応物質は,O3ガスを使用した。
1)Arをキャリア(carrier)ガスとして,常温でアルミニウム前駆体TMA(Trimethylaluminium)を反応チャンバーに供給して,基板にアルミニウム前駆体を吸着
2)反応チャンバ内にArガスを供給して未吸着アルミニウム前駆体または副産物を除去
3)O3ガスを反応室に供給してモノレイヤー(monolayer)を形成
4)反応チャンバ内にArガスを供給して未反応物質または副産物を除去
表面保護物質で1つのエーテル基を有する物質を使用して,シリコン基板上にアルミニウム酸化膜を形成した。ALD工程を使用してアルミニウム酸化膜を形成し,ALD工程温度は250~390℃,反応物質は,O3ガスを使用した。
1)反応チャンバ内に表面保護物質を供給して基板に吸着
2)反応チャンバ内にArガスを供給して未吸着表面保護物質または副産物を除去
3)Arをキャリア(carrier)ガスとして,常温でアルミニウム前駆体TMA(Trimethylaluminium)を反応チャンバーに供給して,基板にアルミニウム前駆体を吸着
4)反応チャンバ内にArガスを供給して未吸着アルミニウム前駆体または副産物を除去
5)O3ガスを反応室に供給してモノレイヤー(monolayer)を形成
6)反応チャンバ内にArガスを供給して未反応物質または副産物を除去
表面保護物質を1つのエーテル基を有する物質から複数のエーテル基を有するTMOA(Trimethyl Orthoacetate;オルト酢酸トリメチル)に変更することを除いて,比較例2と同様の方法でアルミニウム酸化膜を形成した。
Claims (5)
- 表面保護物質を用いた薄膜形成方法において,
金属前駆体を基板が置かれたチャンバーの内部に供給し,前記金属前駆体を前記基板に吸着する金属前駆体供給段階;
前記チャンバーの内部をパージする段階;と
前記チャンバーの内部に反応物質を供給して吸着された前記金属前駆体と反応して薄膜を形成する薄膜形成段階を含み,
前記方法は,前記薄膜形成段階の前に,前記表面保護物質を供給して前記基板に吸着する表面保護物質供給段階;と
前記チャンバーの内部をパージする段階を含み,
下記<化学式1>として表される表面保護物質を用いた薄膜形成方法。
前記<化学式1>において,nはそれぞれ独立に0~6の整数であり,X=O,Sから選択され,R1~R3は独立して炭素数が1~6のアルキル基であり,R4は水素,炭素数1~6のアルキル基,炭素数1~6のアルコキシ基,炭素数1~6のアルキルチオ基から選択される。 - 表面保護物質を用いた薄膜形成方法において,
金属前駆体を基板が置かれたチャンバーの内部に供給し,前記金属前駆体を前記基板に吸着する金属前駆体供給段階;
前記チャンバーの内部をパージする段階;と
前記チャンバーの内部に反応物質を供給して吸着された前記金属前駆体と反応して薄膜を形成する薄膜形成段階を含み,
前記方法は,前記薄膜形成段階の前に,前記表面保護物質を供給して前記基板に吸着する表面保護物質供給段階;と
前記チャンバーの内部をパージする段階を含み,
下記<化学式2>として表される表面保護物質を用いた薄膜形成方法。
前記<化学式2>において,nはそれぞれ独立に0~6の整数であり,R1~R6はそれぞれ独立に炭素数が1~6のアルキル基であり,R7は水素,炭素数が1~6のアルキル基,炭素数が1~6のジアルキルアミンから選択される。 - 前記反応物質は水蒸気(H2O),酸素(O2),及びオゾン(O3)の中から選択される請求項1又は2記載の表面保護物質を用いた薄膜形成方法。
- 前記金属前駆体は,Alを含む3価金属,ZrおよびHfを含む4価金属,NbおよびTaを含む5価金属のいずれかを含む化合物である,請求項1又は2記載の表面保護物質を用いた薄膜形成方法。
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