教師資料查詢 | 類別: 會議論文 | 教師: 許世杰 Hsu, Shih-chieh (瀏覽個人網頁)

標題:The Study of Etching on GaN Epitaxial Layer by Acid Solution
學年108
學期1
發表日期2019/12/28
作品名稱The Study of Etching on GaN Epitaxial Layer by Acid Solution
作品名稱(其他語言)酸性溶液在氮化鎵磊晶層上蝕刻行為之研究
著者Szu-Han CHAO; Shih-Chieh HSU
作品所屬單位
出版者
會議名稱195th International Conference on Science, Engineering & Technology (ICSET)
會議地點Kyoto, Japan
摘要This study aims at investigating the etching methods of acid solution to GaN epitaxial layer. It produced the surface roughening GaN structure by the GaN epitaxial layer on the sapphire which was etched by three different acid solutions, which were H2SO4, H3PO4, and H2SO4+H3PO4 (HH). The researcher investigated the influence of different time and etching etchant to surface morphology and etching depth and used SEM, AFM, and XPS to analyze the samples after etching.
The results show that the choice of different acid solutions will produce different etching morphologies. Under the H2SO4 etching, the thickness of the GaN epitaxial layer does not change significantly, but the pits of the inverted hexagonal pyramid are generated on the surface, and expand and combine with time, finally remain on the etched surface(101 ̅5 ̅); Under the H3PO4 etching, the thickness of the GaN epitaxial layer decreases with time, and the etch pit will change from inverted hexagonal pyramid to hexagonal prism over time, and the pits will be combined with each other, and the size of the pit and the depth will increase with time; Under the HH etching, the thickness of the GaN epitaxial layer decreases with time, and the etch pit will change from inverted hexagonal to dodecagonal pyramid over time, and finally maintained at an angle of about 9.3°. These etching pits are generated because of the dislocation. When GaN is growth on the sapphire substrate, A lattice mismatch between the two causes dislocation, and the acidic solution begins to etch and create pits from these defects.
For the product, the peak of Ga-OEx can be found to increase, and a characteristic peak of a sulfide is generated at 169.1 eV, corresponding product Ga2(SO4)3; in the experimental group of H2SO4 etching; in the H3PO4 experiment, the bonding peak of O 1s and P 2p was found to rise after etching, and it was confirmed that phosphate may be the main cause of etching; In the HH experiment, there was no significant difference in the bonding energy after the reaction, so no product was found on the surface of the sample.
關鍵字氮化鎵;濕式蝕刻;硫酸;硫磷酸;磷酸;GaN;wet etching;acid solution;H2SO4;H3PO4
語言英文(美國)
收錄於
會議性質國際
校內研討會地點
研討會時間20191228~20191229
通訊作者
國別日本
公開徵稿
出版型式
出處
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