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Stripping of CrN thin films by electrochemical methods with different electrolytes
cathodic arc plasma
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由於Si較CrN電阻高許多，所以CrN/Si剝除過程電位變化明顯，可由電位對時間關係圖求得薄膜完全剝除之最短時間tc，而藉由監測電位之變化可以加以控制剝除時間，當電位開始上升時便停止電源供應，可以將CrN/Si完全剝除且不腐蝕矽基材。剝除過程CrN薄膜厚度均隨剝除時間增加而減少，二者之關係可以L/L0 = 1-(t/tc)n 及L-L0 = -kt 之數學模式描述，所得n值及k值可分別表示剝除行為及剝除速率，所得n值約在0.6~1.3之間，顯示薄膜在不同溶液下可能有類似之剝除行為；k 值則在強鹼下(1M KOH)最小，即剝除速率最慢。在剝除CrN/SUS304方面，亦是藉由CrN及SUS304與溶液反應之電位之變化來得知完全剝除時間，但因SUS304與CrN均為導電性物質且電阻率相近，所以只有在某些溶液下變化較明顯而容易判斷。剝除結果，SUS304不繡鋼基材表面都會有雜質殘留，可能需要較長之時間才能剝除乾淨，且表面皆會不同程度的腐蝕現象，這可能是由於SUS304為含有Cr金屬之成份，在電化學剝除過程中亦會被腐蝕，而其中在強鹼(1M KOH)下表面腐蝕較為輕微，此可能因為生成鈍化膜所致。此外，本研究以相同之方法及電解液對非磁控濺射沉積於矽晶片上之氮化鉻膜進行剝除，結果顯示亦能將其CrN膜完全剝除。|
This research mainly employs electrochemical methods under alkaline, acid, and neutral electrolytes to strip the chromium nitride thin films that were deposited by cathodic arc plasma technique on Si wafer (CrN/Si). Moreover, the CrN coated on 304 stainless steel substrate (CrN/SUS304) also strpped on same conditions for comparison. The galvanostatic method is applied to observe the shortest completely stripping time and investigate the influences of stripping rate and stripping results in different concentration of KOH, H2SO4, and Na2SO4 solutions. In addition, a mathematical expression is also utilized to analyze the relationship between film thickness, electrolyte concentration, and stripping time. The results indicate that CrN films can be completely stripped in KOH, H2SO4, and Na2SO4 solutions. It has never used neutral solution to strip the coated films in correlated reports. It is not only satisfied the protection of environment but also the operation safety, hence, should possess good industrial potential. The shortest completely stripping time (tc) could be obtained from the relation of responded potential and stripping time. Because of the resistivity of Si is much higher then CrN. It makes the potential to change obviously during stripping CrN/Si process. We can easily control the stripping completely without attacking Si wafer by stop the power source when the potential start rising. The thickness of CrN films decreases as stripping time increases in all stripping process. The relation between these two factors could be described as L/L0 = 1-(t/tc)n and L-L0=-kt. The n and k value can be regarded as stripping mechanism and the stripping rate, respectively. It obtained n value approximate 0.6~1.3 that may indicate the CrN films has a similar stripping mechanism in deferent solutions. Moreover, the smallest k value that represents the stripping rate of CrN films is the slowest is observed in strong alkaline solution (1M KOH). On the other hand, during stripping the CrN/SUS304, it also obtained the shortest completely stripping time from the change of potential. Because of SUS304 and CrN are both conductors with similar resistivity. It makes that the potential changes obviously just in some solution. After the stripping process done, it still has a little residue stick on the surface of SUS304 substrate. It may need longer time to strip completely. And the surface of SUS304 has different extent of corrosion. It may be the SUS304 is a metal with Cr (18%) that is easily attack. Of the total, it has little corrosion in 1M KOH solution, it may be because that produces a passive film on surface. Additionally, this method can also completely strip the CrN thin films that were deposited by unbalance magnetron sputtering on Si wafer.
|Appears in Collections:||材料科學與工程學系|
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