SOL-GEL PREPARATION OF CDSXSE1-X SOLID-SOLUTION MICROCRYSTAL-DOPED GLASSES

CdSxSe1-x solid solution microcrystal-doped glasses with a significant quantum-sized effect were prepared by the sol-gel process. Gels synthesized by the hydrolysis of complex solution of Si(OC2H5)4, Cd(CH3COO)2.2H2O and selenium were treated in H2S and hydrogen gas atmospheres to form CdSxSe1-x solid solution crystals, whose compositions were determined from the X-ray diffraction and Raman scattering spectra. Sulphur in CdS crystals is substituted for selenium by heating in hydrogen gas, and its content decreases with increasing temperature. On the other hand, the sulphur content increases on reacting the CdSe crystal-precipitated glasses with H2S gas. The optical absorption spectra are shifted towards the red as the crystal size increases, and the gap energy is reciprocally proportional to the square of the crystal size.