Resumen

BECERRIL, M.; SILVA-LOPEZ, H.  y  ZELAYA-ANGEL, O.. Band gap energy in Zn-rich Zn_1-xCd_xTe thin films grown by r.f. sputtering. Rev. mex. fis. [online]. 2004, vol.50, n.6, pp.588-593. ISSN 0035-001X.

Ternary Zn_1-xCd_xTe semiconducting thin films were grown on 7059 Corning glass substrates at room temperature by co-sputtering from a ZnTe-Cd target. The visible Cd-area onto ZnTe target was varied to cover 0% - 4% of the total area. The optical and structural properties of the films were analysed as a function of the Cd concentration (x) on the layers. The sharp diffraction lines indicate mainly the ZnTe in cubic phase. When the cadmium was incorporated into the ZnTe lattice, the band gap energy (E_g) decreased from 2.2748 eV (x=0) to 2.2226 eV (x= 0.081). We found a linear relationship between E_g and (x) in the interval of (x) studied, that predicts a value of the bowing parameter b in the E_g (x) = E_go + ax + bx² relationship, which coincides with the value of b calculated by making the same study for Cd-rich CdZnTe. This result becomes interesting given the large number of values reported for b and a for E_g(x) of this ternary material.

Palabras llave : II-VI semiconductors; thin films; ZnCdTe; radio frequency sputtering.

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