World Journal of Engineering Research and Technology

Prof. Dr. Huynh Van Cong*

ABSTRACT

In CdS(1-x)Te(x) [CdS(1-x)Se(x)]- crystalline alloys, , taking into account their different values of energy-band-structure parameters, as given in Table 1, and also basing on the same physical model and mathematical treatment method, as used in our recent works[1, 2, 3], various electrical-and-thermoelectric laws, relations, and coefficients, enhanced by our static dielectric constant law given in Equations (1a, 1b), which is due to the effects of the size of donor (acceptor) d(a)-radius and the x-concentration, by our accurate Fermi energy, as given in Eq. (11), and finally by our electrical conductivity model, as given in Eq. (14), are now investigated. One notes that, for x=0, their obtained numerical results are reduced to those obtained in the n(p)-type degenerate CdS-crystal, in which all the numerical results, obtained in the same physical conditions, are found to be equal, as those observed in Tables 3n(p), 4n(p), 5n(p) and 6n(p), given in Appendix 1. So, some remarkable results can be cited as follows. In Tables 5n(5p), for a given impurity-density and with increasing temperature T, and then in Tables 6n(6p), for a given and with decreasing N, the reduced Fermi-energy decreases, and other thermoelectric coefficients are in variations, as indicated by the arrows by: (increase: , decrease: ). Furthermore, one notes in these Tables that, for any given x, and N (or T), with increasing T (or decreasing N) one obtains: (i) for , while the numerical results of the Seebeck coefficient S present a same minimum , those of the figure of merit ZT show a same maximum , (ii) for , the numerical results of S, ZT, the Mott figure of merit , the first Van-Cong coefficient VC1, and the Thomson coefficient present the same results: , 0.715, 3.290, , and , respectively, and finally (iii) for , . It seems that these same obtained results could represent a new law in the thermoelectric properties, obtained in the degenerate case ().

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