| Being good candidate materials for solar cell absorbers due to their high absorption and resistance to deterioration, the hetrojunction layers compounds in solar photovoltaic cells CuInSe2, CuInS2, AgGaSe2, and AgGaS2 are evaluated from the continuum mechanics point of view. Using Orthonormal Decomposition Method (ODM), namely, Orthonormal Tensor Basis Method (OTBM), the tetragonal structure is decomposed into two parts; isotropic (two terms) and anisotropic parts. The overall elastic stiffness is used for comparison among these layers compounds, and for correlation with the calculated bulk modulus and lattice constant. A scale quantitative comparison of the contribution of the anisotropy to the elastic stiffness and to quantify the degree of anisotropy in an anisotropic material is investigated using the Norm Ratio Criteria (NRC). Moreover, the norm and norm ratios are found to be very useful for selecting suitable materials for electro-optic devices, acousto-optic devices and solar photovoltaic cells. |
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