EXAFS Study of the Local Order in Cu2ZnSn SxSe1 x 4 Alloys

Local structure in Cu2ZnSn SxSe1 x 4 alloys is studied by the extended X amp; 8208;ray absorption fine structure EXAFS method. K edge absorption spectra of four elements Cu, Zn, Sn, and Se have been measured. The EXAFS analysis of the nearest neighbor shell is performed using simultaneous fitting of the data for all four K edges. This provides value of structural parameters in the most consistent way. The cation anion interatomic distances exhibit the bimodal behavior, i.e., the Me S and Me Se distances Me amp; 8201; amp; 8201;Cu, Zn, and Sn are practically constant over the whole composition range of Cu2ZnSn SxSe1 x 4 alloys. They are compared to the X amp; 8208;ray diffraction XRD values for these alloys. The analysis of the EXAFS Debye amp; 8208;Waller factors indicates differences in the static disorder around different cations with the lowest disorder observed in the first coordination shell of Sn atom