کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366690 | 1388352 | 2006 | 10 صفحه PDF | دانلود رایگان |
The dry etching of indium tin oxide (ITO) layers deposited on glass substrates was investigated in a high density inductively coupled plasma (ICP) source. This innovative low pressure plasma source uses a magnetic core in order to concentrate the electromagnetic energy on the plasma and thus provides for higher plasma density and better uniformity. Different gas mixtures were tested containing mainly hydrogen, argon and methane. In Ar/H2 mixtures and at constant bias voltage (â100Â V), the etch rate shows a linear dependence with input power varying the same way as the ion density, which confirms the hypothesis that the etching process is mainly physical. In CH4/H2 mixtures, the etch rate goes through a maximum for 10% CH4 indicating a participation of the radicals to the etching process. However, the etch rate remains quite low with this type of gas mixture (around 10Â nm/min) because the etching mechanism appears to be competing with a deposition process. With CH4/Ar mixtures, a similar feature appeared but the etch rate was much higher, reaching 130Â nm/min at 10% of CH4 in Ar. The increase in etch rate with the addition of a small quantity of methane indicates that the physical etching process is enhanced by a chemical mechanism. The etching process was monitored by optical emission spectroscopy that appeared to be a valuable tool for endpoint detection.
Journal: Applied Surface Science - Volume 252, Issue 10, 15 March 2006, Pages 3861-3870