Improved synthesis of (In,Ga)N/GaN multiple quantum wells by plasma-assisted molecular-beam epitaxy

Brandt, Oliver; Sun, Yue Jun; Schönherr, Hans-Peter; Ploog, Klaus H.; Waltereit, Patrick; Lim, Sung-Hwan; Speck, James S.
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p90
Academic Journal
We present a simple strategy that minimizes the impact of surface segregation of In during the growth of (In,Ga)N/GaN multiple quantum wells by plasma-assisted molecular-beam epitaxy and simultaneously results in abrupt interfaces. The two ingredients of this strategy are (i) the use of a higher substrate temperature than commonly employed, that is, well above the In desorption point and (ii) the use of a modulated stoichiometry, that is, N-rich during growth of the well and Ga-stable during growth of the barrier.


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