Investigation of weak corrosion inhibitor for copper chemical mechanical polishing
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摘要: 利用电化学、接触角、化学机械抛光等试验研究一种新型环保的铜缓蚀剂聚乙烯吡咯烷酮(polyvinyl pyrrolidone,PVP)的效果。结果表明:PVP在铜化学机械抛光中具有一剂多用的效果,将其与另一种环保弱缓蚀剂1, 2, 4-三氮唑(1, 2, 4-triazole,TAZ)混合使用,既能保证平坦化效果,又能实现工业生产所需的低压高去除率抛光,在粗糙度为2.28 nm时, 去除率达到1 291 nm/min。Abstract: This study uses electrochemical, contact angle, chemical mechanical polishing and other experiments to study the effect of a new environmentally friendly potential copper corrosion inhibitor polyvinyl pyrrolidone(PVP). Experiment results show that PVP has a multi-purpose effect in copper chemical mechanical polishing. That mixing it with another environmentally friendly weak corrosion inhibitor TAZ ensures the flattening effect and environmental protection properties, and can achieve large removal of low pressure in industrial production. When the roughness is 2.28 nm, the removal rate can reach to 1 291 nm/min.
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Key words:
- copper /
- weak corrosion inhibitor /
- PVP /
- mixed corrosion inhibitor
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图 2 不同缓蚀剂溶液下的静态腐蚀速率Staticcorrosionunderdifferentcorrosioninhibitor b 不同缓蚀剂溶液下的静态腐蚀效率Staticcorrosionefficiencyunderdifferentcorrosioninhibitor c TAZ溶液腐蚀后的表面形貌SurfacemorphologyaftercorrosionbyTAZ d PVP溶液腐蚀后的表面形貌SurfacemorphologyaftercorrosionbyPVP e BTA溶液腐蚀后的表面形貌SurfacemorphologyaftercorrosionbyBTA图2 静态腐蚀的速率及腐蚀后的形貌Fig.2Rateofstaticcorrosionandthemorphologyaftercorrosion
图 6 BTA的Nyquist图NyquistdiagramofBTA b TAZ、PVP及其混合缓蚀剂的Nyquist图NyquistdiagramofTAZ PVPandtheirmixedcorrosion c 不同缓蚀剂的等效电路Equivalentcircuitofdifferentcorrosioninhibitors d BTA的阻抗图ImpedancediagramofBTA e TAZ、PVP及混合缓蚀剂的阻抗图ImpedancediagramofTAZ PVPandmixedcorrosion f 4种缓蚀剂组分的相角图Phaseanglediagramoffourcorrosioninhibitorcomponents图6 不同缓蚀剂的拟合后的阻抗图Fig.6Fittedimpedancediagramsofdifferentcorrosioninhibitors
图 7 不同缓蚀剂添加量对应的表面粗糙度及去除率Surfaceroughnessandremovalrateofdifferentcorrosioninhibitorcontent b 更高缓蚀剂添加量对应的表面粗糙度及去除率Surfaceroughnessandremovalrateofhighercorrosioninhibitorcontent c 0.4gTAZ混合不同添加量的PVP对应的表面粗糙度及去除率Surfaceroughnessandremovalrateof0.4gTAZmixedwithdifferentcontentofPVP图7 不同缓蚀剂组分的去除率及表面粗糙度Fig.7Theremovalrateandsurfaceroughnessofdifferentcorrosioninhibitorcomponents
表 1 不同缓蚀剂的极化曲线电化学参数
Table 1. Polarization curve electrochemical parameters of different corrosion inhibitors
表 2 2种缓蚀剂的极化曲线电化学参数
Table 2. Electrochemical parameters of the polarization curves of the two corrosion inhibitors
表 3 电化学阻抗拟合的不同缓蚀剂的主要参数
Table 3. Main parameters of different corrosion inhibitors fitted by electrochemical impedance
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