CN103500728A - 一种铜阻挡层和铜晶籽层的形成方法 - Google Patents

一种铜阻挡层和铜晶籽层的形成方法 Download PDF

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CN103500728A
CN103500728A CN201310459902.7A CN201310459902A CN103500728A CN 103500728 A CN103500728 A CN 103500728A CN 201310459902 A CN201310459902 A CN 201310459902A CN 103500728 A CN103500728 A CN 103500728A
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CN103500728B (zh
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洪齐元
黄海
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Wuhan Xinxin Integrated Circuit Co ltd
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Wuhan Xinxin Semiconductor Manufacturing Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76801Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
    • H01L21/76829Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
    • H01L21/76831Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2221/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
    • H01L2221/10Applying interconnections to be used for carrying current between separate components within a device
    • H01L2221/1005Formation and after-treatment of dielectrics
    • H01L2221/1052Formation of thin functional dielectric layers
    • H01L2221/1057Formation of thin functional dielectric layers in via holes or trenches

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Abstract

本发明涉及一种铜阻挡层和铜晶籽层的形成方法,包括以下步骤,步骤一,去气,对基板上的通孔或沟槽进行去气处理;步骤二,淀积第一铜阻挡层,在基板上的通孔或沟槽中淀积一层铜阻挡层;步骤三,淀积第二铜阻挡层,在上述步骤二的基础上,在所述第一铜阻挡层的表面继续淀积第二铜阻挡层,所述第一铜阻挡层的淀积速率小于所述第二铜阻挡层的淀积速率;步骤四,淀积铜晶籽层,在上述步骤三中的第二阻挡层表面淀积一层铜晶籽层。本发明一种铜阻挡层和铜晶籽层的形成方法中,在淀积铜阻挡层的过程中分两步进行,第一铜阻挡层的淀积速率小于第二铜阻挡层的淀积速率,此种方法可以对薄膜进行有效的应力释放,避免薄膜开裂,从而提高了产品的合格率。

Description

一种铜阻挡层和铜晶籽层的形成方法
技术领域
本发明涉及一种在半导体技术中铜的互连方法,具体的涉及一种铜阻挡层和铜晶籽层的形成方法。
背景技术
铜的互连采用双大马士革工艺,首先在基板上淀积一定厚度的低介电常数介质材料,并在此材料上刻出通孔和沟槽等,然后在通孔和沟槽中填充铜金属,从而形成金属互连线。铜的填充工艺是由阻挡层和晶籽层的制备与铜的电镀填充共同完成的,而阻挡层和晶籽层的形成是其重要环节,如果淀积不好,会因应力过大而导致薄膜开裂,使器件失效。现有工艺采用去气(degas),阻挡层淀积(TaN),晶籽层淀积(Cu),电镀铜等流程形成,但是其在沟槽底部拐角出常因应力大而导致薄膜开裂,迫切需要解决。
发明内容
本发明所要解决的技术问题是提供一种防止沟槽底部拐角薄膜开裂的铜阻挡层和铜晶籽层的形成方法。
本发明解决上述技术问题的技术方案如下:一种铜阻挡层和铜晶籽层的形成方法,包括以下步骤,
步骤一,去气,对基板上的通孔或沟槽进行去气处理;
步骤二,淀积第一铜阻挡层,在基板上的通孔或沟槽中淀积一层铜阻挡层;
步骤三,淀积第二铜阻挡层,在上述步骤二的基础上,在所述第一铜阻挡层的表面继续淀积第二铜阻挡层,所述第一铜阻挡层的淀积速率小于所述第二铜阻挡层的淀积速率;
步骤四,淀积铜晶籽层,在上述步骤三中的第二阻挡层表面淀积一层铜晶籽层。
本发明的有益效果是:在淀积铜阻挡层的过程中分两步进行,第一铜阻挡层的淀积速率小于第二铜阻挡层的淀积速率,此种方法可以对薄膜进行有效的应力释放,避免薄膜开裂,从而提高了产品的合格率。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述第一铜阻挡层的淀积厚度为50~100埃。
进一步,所述淀积第一铜阻挡层的条件为,上射频功率200~600W,下射频功率为100~400W,通入氩气的流量为30~100毫升每分。
采用上述进一步技术方案的有益效果为:采用上射频功率200~600W,下射频功率为100~400W,通入氩气的流量为30~100毫升每分,可以更好的控制沉积均匀性,使得淀积的效果更好。
进一步,所述第二同阻挡层的淀积厚度为100~200埃。
进一步,所述淀积第二铜阻挡层的条件为,上射频功率300~800W,下射频功率为200~600W,通入氩气的流量为30~100毫升每分。
采用上述进一步技术方案的有益效果为:采用上射频功率300~800W,下射频功率为200~600W,通入氩气的流量为30~100毫升每分,使得淀积第二铜阻挡层的速率大于淀积第一铜阻挡层的速率,可以对薄膜进行有效的应力释放,避免薄膜开裂,提高了铜阻挡层的性能。
附图说明
图1为本发明一种铜阻挡层和铜晶籽层的形成方法的流程图;
图2为本发明一种铜阻挡层和铜晶籽层的形成方法的状态图。
附图中,各标号所代表的部件列表如下:
1、去气,2、淀积第一铜阻挡层,3、淀积第二铜阻挡层,4、淀积铜晶籽层。
具体实施方式
以下结合附图对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。
如图1、图2所示,一种铜阻挡层和铜晶籽层的形成方法,首先,去气1,对基板上的通孔或沟槽进行去气处理;然后,淀积第一铜阻挡层2,在基板上的通孔或沟槽中淀积一层铜阻挡层,所述第一铜阻挡层的淀积厚度为50~100埃,所述淀积第一铜阻挡层的条件为,上射频功率200~600W,下射频功率为100~400W,通入氩气的流量为30~100毫升每分;接着,淀积第二铜阻挡层3,以大于淀积第一铜阻挡层的淀积速率在所述第一铜阻挡层的表面继续淀积第二铜阻挡层,所述第二同阻挡层的淀积厚度为100~200埃,所述淀积第二铜阻挡层的条件为,上射频功率300~800W,下射频功率为200~600W,通入氩气的流量为30~100毫升每分;最后,淀积铜晶籽层4,在第二阻挡层表面淀积一层铜晶籽层。
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (5)

1.一种铜阻挡层和铜晶籽层的形成方法,其特征在于:包括以下步骤,
步骤一,去气,对基板上的通孔或沟槽进行去气处理;
步骤二,淀积第一铜阻挡层,在基板上的通孔或沟槽中淀积一层铜阻挡层;
步骤三,淀积第二铜阻挡层,在上述步骤二的基础上,在所述第一铜阻挡层的表面继续淀积第二铜阻挡层,所述第一铜阻挡层的淀积速率小于所述第二铜阻挡层的淀积速率;
步骤四,淀积铜晶籽层,在上述步骤三中的第二阻挡层表面淀积一层铜晶籽层。
2.根据权利要求1所述的一种铜阻挡层和铜晶籽层的形成方法,其特征在于:所述第一铜阻挡层的淀积厚度为50~100埃。
3.根据权利要求2所述的一种铜阻挡层和铜晶籽层的形成方法,其特征在于:所述淀积第一铜阻挡层的条件为,上射频功率200~600W,下射频功率为100~400W,通入氩气的流量为30~100毫升每分。
4.根据权利要求1所述的一种铜阻挡层和铜晶籽层的形成方法,其特征在于:所述第二同阻挡层的淀积厚度为100~200埃。
5.根据权利要求4所述的一种铜阻挡层和铜晶籽层的形成方法,其特征在于:所述淀积第二铜阻挡层的条件为,上射频功率300~800W,下射频功率为200~600W,通入氩气的流量为30~100毫升每分。
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CN109212646A (zh) * 2018-10-19 2019-01-15 苏州文迪光电科技有限公司 一种滤光片镀膜工艺

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CN109212646B (zh) * 2018-10-19 2021-09-21 苏州文迪光电科技有限公司 一种滤光片镀膜方法

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