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AlGaN/GaN multiple quantum wells grown by using atomic layer deposition technique

  • Ming-Hua Lo (a1), Zhen-Yu Li (a2), Shih-Wei Chen (a3), Jhih-Cang Hong (a4), Ting-Chang Lu (a5), Hao-Chung Kuo (a6) and Shing-Chung Wang (a7)...

Abstract

In this work, we report on the growth of ultraviolet (UV) AlGaN/GaN multiple quantum wells (MQWs) structure using atomic layer deposition (ALD) technique. The AlGaN/GaN MQW sample grown on the sapphire substrate consisted of three GaN QWs and four AlGaN barriers comprised AlN/GaN superlattices (SLs). The root-mean-square value of the surface morphology was only 0.35 nm observed from the atomic force microscope image and no crack was found on the surface. Both of the high resolution X-ray diffraction curves and transmission electron microscope images showed sharp interfaces between SLs layers and QWs with good periodicity. These results demonstrate that the ALD could be a very useful technique for controlling the crystalline quality and thickness of the III-nitride epilayer.

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