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Cl2基气体感应耦合等离子体刻蚀GaN的工艺
Cl2-Based Dry Etching of GaN Using Inductively Coupled Plasma
【摘要】 采用Cl2/He对GaN基片进行感应耦合等离子体刻蚀,并比较了相同条件下使用Cl2/He,Cl2/Ar对GaN基片进行刻蚀的优劣.实验中通过改变ICP功率、直流自偏压、气体总流量和气体组分等方式,讨论了这些因素对刻蚀速率和刻蚀后表面粗糙度的影响.实验结果表明,用Cl2/He气体刻蚀GaN材料可以获得较高的刻蚀速率,最高可达420nm/min.同时刻蚀后GaN材料的表面形貌也较为平整,均方根粗糙度(RMS)可达1nm以下.SEM图像显示刻蚀后表面光洁,刻蚀端面陡直.最后比较了相同条件下使用Cl2/He,Cl2/Ar刻蚀GaN基片的刻蚀速率、表面形貌,以及制作n型电极后的比接触电阻.
【Abstract】 Inductively coupled plasma(ICP) etching of GaN is carried out with Cl2/He and Cl2/Ar.The effects of ICP power,DC bias,total flow rate,and Cl2∶He ratio on the etch rate and surface morphology are discussed when etching GaN using Cl2/He.Experimental results indicate that the etching rate is very high,and the maximum reaches 420nm/min.The etched surface is very smooth,with an RMS less than 1nm.An SEM photo shows a smooth etched surface and vertical sidewall.The difference between Cl2/He and Cl2/Ar etching under the same conditions,including etch rate,surface morphology,and the ρc of the n-type contact on the etched surface,is investigated.
- 【文献出处】 半导体学报 ,Chinese Journal of Semiconductors , 编辑部邮箱 ,2006年07期
- 【分类号】TN305
- 【被引频次】17
- 【下载频次】442