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Horikiri, Fumimasa; Ohta, Hiroshi; Asai, Naomi; Narita, Yoshinobu; Yoshida, Takehiro; Mishima, Tomoyoshi
Applied physics express, 09/2018, Volume: 11, Issue: 9Journal Article
Photo-electrochemical (PEC) etching was used to fabricate deep trench structures in a GaN-on-GaN epilayer grown on n-GaN substrates. A 50-nm-thick layer of Ti used for an etching mask was not removed even after etching to a depth of >30 µm. The width of the side etching was less than 1 µm with high accuracy. The aspect ratio (depth/width) of a 3.3-µm-wide trench with a PEC etching depth of 24.3 µm was 7.3. These results demonstrate the excellent potential of PEC etching for fabricating deep trenches in vertical GaN devices.
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