In order to enhance understanding of photoresist ashing and give reference to 4 mask process improvement
the effect of each film layer on photoresist ashing was researched.In the same ashing process condition
ashing rate of samples with different film layer was measured by -step profiler
and the mechanism of test result was analysed.Experimental results indicate that a-Si can decrease ashing rate
SD metal can increase ashing rate
gate metal has no effect on the ashing rate.And for normal film structure TFT array substrate
the bigger SD pattern density is
the smaller ashing rate will be. If SD pattern density increased 1%
ashing rate would decreased 14 nm/min.Because of influence on ashing plasma
a-Si and SD metal have an effect on ashing rate.
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references
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