CN106929822A - 一种薄膜沉积方法 - Google Patents

一种薄膜沉积方法 Download PDF

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CN106929822A
CN106929822A CN201710228700.XA CN201710228700A CN106929822A CN 106929822 A CN106929822 A CN 106929822A CN 201710228700 A CN201710228700 A CN 201710228700A CN 106929822 A CN106929822 A CN 106929822A
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李健
许隽
韩晓刚
谢素兰
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Shanghai Huali Microelectronics Corp
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/34Nitrides
    • C23C16/345Silicon nitride
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/02Pretreatment of the material to be coated
    • C23C16/0227Pretreatment of the material to be coated by cleaning or etching
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/455Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32Gas-filled discharge tubes
    • H01J37/32431Constructional details of the reactor
    • H01J37/32798Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
    • H01J37/32853Hygiene
    • H01J37/32862In situ cleaning of vessels and/or internal parts

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Abstract

本发明提供了一种薄膜沉积方法,通过在清洗过程之后增加向反应腔内通入N2O气体产生等离子体进行处理,能够有效去除清洗后残留的F离子,避免F离子和反应腔内的部件例如喷淋头中的铝反应,从而有效延缓了所沉积的薄膜均一性上升的周期,达到了延长反应腔内的部件例如喷淋头以及整个反应腔的使用寿命的目的。

Description

一种薄膜沉积方法
技术领域
本发明涉及半导体制造技术领域,具体涉及一种薄膜沉积方法。
背景技术
化学气相沉积制程是半导体工艺中非常重要的一个环节,其中Lam Research公司的Vector机台是12寸生产线中化学气相沉积制程的一个主流机台,几乎可以用于沉积所有的各种性质的绝缘电介质薄膜,应用非常广泛。
在量产工业(fab)中,Vector机台最大的消耗品就是其气体分流器,因为半导体制程的高标准,必须要求所沉积薄膜具有良好的薄膜均一性,而薄膜均一性在很大程度上取决于喷淋头(showerhead)的状况,随着机台跑货片数的增加,showerhead状态也会随之变化,导致所沉积薄膜均一性缓慢上升,最终会超出规格线。此时只能更换showerhead才能使薄膜均一性回复正常。根据机台沉积薄膜性质的不同,分别有不同的使用寿命,有些制程长至15万片以上,有些制程,比如主要跑氮化硅薄膜的机台,2~3万片就必须更换showerhead,这已成为CVD一项主要的成本支出。
在实际薄膜沉积工艺制程中,在使用LAM Vector机台工艺中,一般累计淀积一定膜厚后做一次清洗(shutdown clean),然后以此循环。如图1所示,图1为现有薄膜沉积机台薄膜沉积工艺顺序示意图,包括:
步骤01':对反应腔进行清洗;
步骤02':对晶圆进行预沉积保护薄膜的制备(undercoat);
步骤03':进行薄膜沉积过程。
而上述清洗的过程中,为了保证残留薄膜能被彻底清除,都会有一定的过清洗(over clean)时间,多余的氟离子就会和showerhead表面的金属铝反应形成氟化铝(AlFx),长期积累就会影响薄膜沉积速率。而氟化铝形成的不均匀则会导致薄膜均一性的不断上升。一般对机台进行维护保养(PM)对showerhead所作的清洗并不能有效去除表面的氟化铝,所以必须更换showerhead,产生了额外的成本。
发明内容
为了克服以上问题,本发明旨在一种薄膜沉积方法,从而有效去除清洗后残留的F离子,延长反应腔内使用寿命。
为了达到上述目的,本发明提供了一种薄膜沉积方法,包括对反应腔进行清洗和进行薄膜沉积过程,反应腔内设置有喷淋头,在对晶圆进行清洗和薄膜沉积过程之间还包括:向反应腔内通入N2O气体产生等离子体进行处理。
优选地,对晶圆进行清洗时采用含氟的气体或含氟药液。
优选地,薄膜沉积过程包括对多片晶圆进行薄膜沉积。
优选地,向反应腔内通入N2O气体产生等离子体进行处理之后,在进行薄膜沉积过程之前,还包括:对晶圆进行预沉积保护薄膜的制备。
优选地,通入N2O气体的流量为8000~9000sccm。
优选地,向反应腔内通入N2O气体产生等离子体进行处理时,采用的功率为1800~1850W。
优选地,向反应腔内通入N2O气体产生等离子体进行处理时,采用的反应温度为400~450℃。
优选地,所述薄膜沉积过程沉积的薄膜为绝缘电介质薄膜。
优选地,所述薄膜为氮化硅薄膜。
优选地,所述反应腔为CVD薄膜沉积反应腔。
本发明在机台清洗之后,增加一个N2O等离子体处理(plasma treatment)的步骤,有效去除清洗后残留的F离子,避免F离子和反应腔内的部件例如喷淋头(Showerhead)中的铝反应,从而有效延缓了所沉积的薄膜均一性上升的周期,达到了延长反应腔内的部件例如喷淋头(showerhead)以及整个反应腔的使用寿命的目的。
附图说明
图1为现有薄膜沉积机台薄膜沉积工艺顺序示意图
图2为本发明的一个较佳实施例的薄膜沉积方法的流程示意图
具体实施方式
为使本发明的内容更加清楚易懂,以下结合说明书附图,对本发明的内容作进一步说明。当然本发明并不局限于该具体实施例,本领域内的技术人员所熟知的一般替换也涵盖在本发明的保护范围内。
以下结合附图2和具体实施例对本发明作进一步详细说明。需说明的是,附图均采用非常简化的形式、使用非精准的比例,且仅用以方便、清晰地达到辅助说明本实施例的目的。
请参阅图2,本实施例的一种薄膜沉积方法,包括:
步骤01:对反应腔进行清洗。这里,反应腔内设置有喷淋头等部件,在清洗时,对晶圆进行清洗时采用含氟的气体或含氟药液,多余的氟离子会与反应腔内的部件表面发生反应,例如喷淋头,而影响反应腔内的薄膜沉积的均匀性。反应腔可以为CVD薄膜沉积反应腔。
步骤02:向反应腔内通入N2O气体产生等离子体进行处理。
具体的,为了使N2O等离子体能够充分反应掉清洗过程残留的F离子,通入N2O气体的流量为8000~9000sccm,采用的功率为1800~1850W,较佳的为1820W,采用的反应温度为400~450℃。
步骤03:对晶圆进行预沉积保护薄膜的制备(undercoat)。
步骤04:进行薄膜沉积过程。
这里,薄膜沉积过程包括对多片晶圆进行薄膜沉积,薄膜沉积过程沉积的薄膜可以为绝缘电介质薄膜,例如氮化硅薄膜。
需要说明的是,可以重复上述过程,直至完成一批晶圆的薄膜沉积。
虽然本发明已以较佳实施例揭示如上,然实施例仅为了便于说明而举例而已,并非用以限定本发明,本领域的技术人员在不脱离本发明精神和范围的前提下可作若干的更动与润饰,本发明所主张的保护范围应以权利要求书为准。

Claims (10)

1.一种薄膜沉积方法,包括对反应腔进行清洗和进行薄膜沉积过程,反应腔内设置有喷淋头,其特征在于,在对晶圆进行清洗和薄膜沉积过程之间还包括:向反应腔内通入N2O气体产生等离子体进行处理。
2.根据权利要求1所述的薄膜沉积方法,其特征在于,对晶圆进行清洗时采用含氟的气体或含氟药液。
3.根据权利要求1所述的薄膜沉积方法,其特征在于,薄膜沉积过程包括对多片晶圆进行薄膜沉积。
4.根据权利要求1所述的薄膜沉积方法,其特征在于,向反应腔内通入N2O气体产生等离子体进行处理之后,在进行薄膜沉积过程之前,还包括:对晶圆进行预沉积保护薄膜的制备。
5.根据权利要求1所述的薄膜沉积方法,其特征在于,通入N2O气体的流量为8000~9000sccm。
6.根据权利要求1所述的薄膜沉积方法,其特征在于,向反应腔内通入N2O气体产生等离子体进行处理时,采用的功率为1800~1850W。
7.根据权利要求1所述的薄膜沉积方法,其特征在于,向反应腔内通入N2O气体产生等离子体进行处理时,采用的反应温度为400~450℃。
8.根据权利要求1所述的薄膜沉积方法,其特征在于,所述薄膜沉积过程沉积的薄膜为绝缘电介质薄膜。
9.根据权利要求8所述的薄膜沉积方法,其特征在于,所述薄膜为氮化硅薄膜。
10.根据权利要求1所述的薄膜沉积方法,其特征在于,所述反应腔为CVD薄膜沉积反应腔。
CN201710228700.XA 2017-04-10 2017-04-10 一种薄膜沉积方法 Pending CN106929822A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111370282A (zh) * 2018-12-26 2020-07-03 江苏鲁汶仪器有限公司 一种等离子增强化学气相沉积腔室的清洗方法
CN113249724A (zh) * 2021-05-11 2021-08-13 中山大学 一种金属膜上沉积二氧化硅膜的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102446833A (zh) * 2011-09-29 2012-05-09 上海华力微电子有限公司 一种降低双大马士革氮化硅工艺颗粒的处理方法
CN202246855U (zh) * 2011-09-16 2012-05-30 理想能源设备(上海)有限公司 氧化锌薄膜沉积设备

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202246855U (zh) * 2011-09-16 2012-05-30 理想能源设备(上海)有限公司 氧化锌薄膜沉积设备
CN102446833A (zh) * 2011-09-29 2012-05-09 上海华力微电子有限公司 一种降低双大马士革氮化硅工艺颗粒的处理方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111370282A (zh) * 2018-12-26 2020-07-03 江苏鲁汶仪器有限公司 一种等离子增强化学气相沉积腔室的清洗方法
CN111370282B (zh) * 2018-12-26 2022-06-24 江苏鲁汶仪器有限公司 一种等离子增强化学气相沉积腔室的清洗方法
CN113249724A (zh) * 2021-05-11 2021-08-13 中山大学 一种金属膜上沉积二氧化硅膜的方法
CN113249724B (zh) * 2021-05-11 2022-06-21 中山大学 一种金属膜上沉积二氧化硅膜的方法

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