Systems and methods for thin-film deposition of metal oxides using excited nitrogen-oxygen species
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-021/31
H01L-021/469
H01L-021/00
C23C-016/40
C23C-016/30
H01L-021/02
H01L-029/51
C23C-016/455
H01L-021/28
H01L-029/78
출원번호
US-0102980
(2011-05-06)
등록번호
US-8877655
(2014-11-04)
발명자
/ 주소
Shero, Eric J.
Raisanen, Petri I.
Jung, Sung-Hoon
Wang, Chang-Gong
출원인 / 주소
ASM America, Inc.
대리인 / 주소
Snell & Wilmer LLP
인용정보
피인용 횟수 :
79인용 특허 :
125
초록
The present invention relates to a process and system for depositing a thin film onto a substrate. One aspect of the invention is depositing a thin film metal oxide layer using atomic layer deposition (ALD).
대표청구항▼
1. A method for depositing a film on a substrate that is within a reaction chamber, the method comprising applying an atomic layer deposition cycle to the substrate, the cycle comprising: exposing the substrate to a precursor gas for a precursor pulse interval and then removing the precursor gas;and
1. A method for depositing a film on a substrate that is within a reaction chamber, the method comprising applying an atomic layer deposition cycle to the substrate, the cycle comprising: exposing the substrate to a precursor gas for a precursor pulse interval and then removing the precursor gas;and exposing the substrate to an oxidizer comprising an oxidant gas and a nitrogen-containing species gas comprising activated ionic or radical species for an oxidation pulse interval and then removing the oxidizer;prior to introducing the nitrogen-containing species to the reaction chamber, monitoring the nitrogen-containing species; andadjusting one or more process parameters based on the step of monitoring. 2. The method of claim 1 wherein the precursor gas comprises a rare earth metal selected from the group consisting of Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb, Lu, and combinations thereof. 3. The method of claim 1 wherein the precursor gas comprises at least one of an organo-metallic and a metal halide compound. 4. The method of claim 1 wherein the precursor gas comprises at least one of: hafnium tetrachloride (HfCl4);titanium tetrachloride (TiCl4);tantalum pentachloride (TaCl5);tantalum pentafluoride (TaF5);zirkonium tetrachloride (ZrCl4);rare earth betadiketonate compounds including (La(THD)3) and (Y(THD)3);rare earth cyclopentadienyl (Cp) compounds including La(iPrCp)3;rare earth amidinate compounds including lanthanum tris-formamidinate La(FAMD)3;cyclooctadienyl compounds including rare earth metals;alkylamido compounds including: tetrakis-ethyl-methylamino hafnium (TEMAHf);tetrakis (diethylamino) hafnium ((EtzN)4Hf or TDEAH); andtetrakis (dimethylamino) hafnium ((Me2N)4Hf or TDMAH); alkoxides;halide compounds of silicon;silicon tetrachloride; silicon tetrafluoride; andsilicon tetraiodide. 5. The method of claim 1 wherein the oxidant gas is a nitrogen- containing gas. 6. The method of claim 1 wherein the nitrogen-containing species gas includes activated ionic or radical species including at least one of NO*, N2O*, NO2*, NO3*, and N2O5*. 7. The method of claim 1 wherein the oxidant gas comprises ozone and one or more gasses selected from the group consisting of O, O2, NO, N2O, NO2, NO3, N2O5, an NxOy radical species, an NxOy ionic species, and combinations thereof. 8. The method of claim 6 wherein the oxidant gas comprises approximately 5 atomic percent to 25 atomic percent O3. 9. The method of claim 6 wherein O3 is produced from O2 and a nitrogen source gas wherein a mixture of the O2 and nitrogen source gas is subjected to a plasma discharge. 10. The method of claim 8 wherein the nitrogen source gas is at least one of N2, NO, N2O, NO2, NO3, and N2O5. 11. The method of claim 1 wherein the nitrogen-containing species gas comprises one or more of the group consisting of: an excited NxOy radical species, an excited NxOy ionic species, and combinations thereof. 12. The method of claim 1 wherein the oxidant gas comprises a mixture of two or more of O, O2, NO, N2O, NO2, NO3, N2O5, NOx, NxOy, radicals thereof, and O3, and wherein the mixture comprises approximately 5 atomic percent to 25 atomic percent O3. 13. The method of claim 9 wherein a flow ratio of N2/O2 is >0.001. 14. The method of claim 9 wherein the ratio of the O2 and the nitrogen source gas determine at least one of: an amount of a nitrogen-containing species gas comprising activated ionic or radical species including at least one of NO*, N2O*, NO2*, NO3*, and N2O5*;a concentration of a nitrogen-containing species gas comprising activated ionic or radical species including at least one of NO*, N2O*, NO2*, NO3*, and N2O5*;a growth rate of the deposited film;a film uniformity across the substrate;a dielectric constant of the deposited film;an index of refraction of the deposited film; anda molecular composition of the deposited film. 15. The method of claim 9 wherein a power input controls the plasma, and an amount of power delivered to the plasma determine at least one of: an amount of a nitrogen-containing species gas comprising activated ionic or radical species including at least one of NO*, N2O*, NO2*, NO3*, and N2O5*;a concentration of a nitrogen-containing species gas comprising activated ionic or radical species including at least one of NO*, N2O*, NO2*, NO3*, and N2O5*;a growth rate of the deposited film;a film uniformity across the substrate;a dielectric constant of the deposited film;an index of refraction of the deposited film; anda molecular composition of the deposited film. 16. The method of claim 9 further comprising: generating the oxidizer by exposing O2 and a nitrogen source gas to a plasma discharge;monitoring a ratio of O3 and excited NxOy, species generated by the plasma discharge; andadjusting at least one of a power input to the plasma discharge, a temperature of a housing;a flow rate of the O2, and a flow rate of the nitrogen source gas to achieve a predetermined criterion. 17. The method of claim 16 wherein the predetermined criterion includes at least one of: an oxidizer flow rate;an oxidant/NxOy concentration ratio;an active NxOy species concentration;a ratio of active NxOy species, wherein the excited NxOy species gas contains a plurality of excited nitrogen-oxygen compounds; anda concentration of a particular active nitrogen-oxygen compound. 18. The method of claim 1 further comprising: exposing the substrate to a second precursor gas for a second precursor pulse interval then removing the second precursor gas thereafter; andafter removing the second precursor gas, exposing the substrate to an oxidizer comprising an oxidant gas and a nitrogen-containing species gas for a oxidation pulse interval then removing the oxidizer thereafter. 19. A system comprising: a reaction chamber;a precursor reactant source coupled to the reactor chamber;a purge gas source coupled to the reactor chamber;an oxidizer gas source coupled to the reactor chamber;an activated nitrogen-containing species source coupled to the reactor chamber;a system operation and control mechanism configured to cause the system to apply an atomic layer deposition cycle to a substrate, the cycle comprising: exposing the substrate to a precursor gas for a precursor pulse interval then removing the precursor gas thereafter; andexposing the substrate to an oxidizer comprising an oxidant gas and an activated nitrogen-containing species gas for an oxidation pulse interval then removing the oxidizer thereafter; anda sensor coupled to the activated nitrogen-containing species source, wherein the sensor monitors one or more of an amount, a composition, and a concentration of the activated nitrogen-containing species. 20. The system of claim 19 that further includes either a plasma discharge or an ozone generator. 21. The system of claim 19 that further includes a generator being supplied (a) O2 from an oxidizer source, and (b) a nitrogen-bearing molecule from a nitrogen source. 22. The system of claim 19 that further includes a coronal discharge to create the activated nitrogen-containing species. 23. The system of claim 19 wherein the sensor communicates with a control system to control the amount of activated nitrogen-containing species. 24. The system of claim 19 that further includes a mechanism for loading a substrate into the reaction chamber. 25. The system of claim 19 wherein the oxidizer gas source is coupled to the reactor chamber separate from where the activated nitrogen-containing source is coupled to the reaction chamber.
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