Abstract
We compared InGaN- and AlInGaN-layers grown by metal-organic vapor phase epitaxy (MOVPE) in terms of morphology, growth mode and indium incorporation. The growth parameters of the AlInGaN layers only differed from InGaN growth by an additional trimethylaluminum (TMAl) flow. Rutherford backscattering spectrometry (RBS) and X-ray photoelectron spectroscopy (XPS) measurements showed that the indium incorporation in AlInGaN was significantly increased compared to InGaN. Atomic force microscopy (AFM) was used to analyze the morphology and the growth mode. The additional TMAl flow changed the growth mode from a step-flow mode to a 2-dimensional (2D) island nucleation mode, yielding a smoother layer morphology. This behavior can be explained by the low surface mobility of the Al adatoms and their nucleation on terraces between adjacent steps. Step bunching – as observed for InGaN – was avoided during AlInGaN growth. This reduced the AFM root mean square roughness by 40% compared to InGaN. Possible impacts on charge carrier localization in QWs are discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
