Effects of biaxial strain and chemical ordering on the band gap of InGaN

Wright, A. F.; Leung, K.; van Schilfgaarde, M.
January 2001
Applied Physics Letters;1/8/2001, Vol. 78 Issue 2, p189
Academic Journal
We have performed first-principles calculations to examine the effects of biaxial strain and chemical ordering on the band gap of wurtzite In[sub x]Ga[sub 1-x]N in the range 0≤x≤0.5. Our results for random unstrained alloys are in good agreement with theoretical estimates and measurements on unstrained zinc-blende alloys, but are in poor agreement with recent measurements on strained wurtzite alloys which display significantly lower band gaps. Biaxial strain is found to have a nonlinear effect on alloy band gaps, increasing them for x<0.25 and decreasing them for x>0.25. However, the overall agreement with measurements on wurtzite alloys remains poor. Chemical ordering along the [0001] direction in strained alloys is found to decrease their band gaps considerably, reducing the discrepancy with measurements. We discuss our results with regard to the current understanding of InGaN alloys. © 2001 American Institute of Physics.


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