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Analysis by optical absorption and transmission electron microscopy of the strain inhomogeneities in InGaAs/InP strained layers
Roura Grabulosa, Pere; Clark, S. A.; Bosch Estrada, José; Peiró Martínez, Francisca; Cornet i Calveras, Albert; Morante i Lleonart, Joan Ramon
Universitat de Barcelona
Optical absorption spectra and transmission electron microscopy (TEM) observations on InGaAs/InP layers under compressive strain are reported. From the band¿gap energy dispersion, the magnitude of the strain inhomogeneities. Is quantified and its microscopic origin is analyzed in view of the layer microstructure. TEM observations reveal a dislocation network at the layer interface the density of which correlates with ¿¿. It is concluded that local variations of dislocation density are responsible for the inhomogeneous strain field together with another mechanism that dominates when the dislocation density is very low.
Propietats òptiques
Optical properties
(c) American Institute of Physics, 1995
Artículo
American Institute of Physics
         

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