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Cl_2/Ar/BCl_3感应耦合等离子体GaN/Al_(0.28)Ga_(0.72)N的非选择性刻蚀 被引量:6

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摘要 利用Cl_2/Ar/BCl_3感应耦合等离子体(ICP)刻蚀技术对GaN与Al_(0.28)Ga_(0.72)N材料之间的非选择性刻蚀和刻蚀以后GaN/Al_(0.28)Ga_(0.72)N异质结的表面物理特性进行了研究。实验表明,优化等离子体中BCl_3的含量(20%~60%),提高ICP功率和直流偏压,降低反应室压强有利于获得非选择性刻蚀.而GaN/Al_(0.28)Ga_(0.72)N异质结刻蚀后的表面形貌与等离子体中的化学组分、反应室压强有密切的关系。在Cl_2/Ar(4:1)中加入20%BCl_3可以在较高的刻蚀速率条件下获得GaN和Al_(0.28)Ga_(0.72)N之间的非选择性刻蚀,并将GaN/Al_(0.28)Ga_(0.720N异质结刻蚀后的表面均方根粗糙度由10.622 nm降低至0.495 nm,优于未刻蚀的GaN/Al_(0.28)Ga_(0.72)N异质结的表面,AES分析表明,在刻蚀过程中从AlGaN的表面有效除去氧对获得非选择性刻蚀和光滑的刻蚀表面是至关重要的。
出处 《中国科学(E辑)》 CSCD 北大核心 2004年第3期345-352,共8页 Science in China(Series E)
基金 国家重点基础研究发展规划(批准号:TG2000036601) 国家高技术研究发展计划(批准号:2001AA312190 2002AA31119Z) 国家自然科学基金(批准号:69896260-01)
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