Electronic Theory of Disordered Ternary Alloys: Coherent-Potential Approximation and Its Diagrammatic Equivalent

1973 ◽  
Vol 7 (10) ◽  
pp. 4435-4449 ◽  
Author(s):  
Leonard M. Scarfone
Keyword(s):  
Coherent Potential Approximation ◽  
Ternary Alloys ◽  
Potential Approximation ◽  
Electronic Theory

A model for the bandgap energy of the dilute nitride InGaNAs alloys by modifying simplified coherent potential approximation

2014 ◽  
Vol 28 (08) ◽  
pp. 1450066 ◽  
Author(s):  
Chuan-Zhen Zhao ◽  
You-Yang Qu ◽  
Tong Wei ◽  
Xiao-Dong Sun ◽  
Sha-Sha Wang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Composition Range ◽  
Coherent Potential Approximation ◽  
Ternary Alloys ◽  
Bandgap Energy ◽  
Dilute Nitride ◽  
Potential Approximation ◽  
Physical Mechanisms

In this paper, a model describing the bandgap energy of the dilute nitride alloy In x Ga 1-x N y As 1-y is developed based on the modification of simplified coherent potential approximation (MSCPA) and the band anti-crossing model (BAC). The parameters in the model are obtained by fitting the experimental bandgap energies of the ternary alloys InGaAs , InGaN , GaNAs and InNAs . It is found that the results agree well with the experimental data. We also find that although the bandgap energies of In x Ga 1-x N y As 1-y and In x Ga 1-x As can be calculated by using MSCPA, the physical mechanisms for the bandgap evolution of In x Ga 1-x N y As 1-y and In x Ga 1-x As are very different. In addition, it is found that the model in this work may be used in a larger composition range than the BAC model.

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