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摘要
A series of RbxCs1-xAg4I5 (x = 0-1) thin films were grown by vacuum evaporation on NaCl crystal substrates at 350K. The absorption spectra of these films were measured at 80K in the wavelength range from 240nm to 400nm. It is shown that superionic conductor thin films of quaternary compound Rb0.5Cs0.5Ag4I5 and ternary compound RbAg4I5 can be obtained at x = 0.5-0.6 and x = 0.7-1, respectively. At x = 0.6-5, the combined compound film of the mixture of 30mol% RbAg4I5 and 70 mol% Rb(0.5)Cs(0.5)A(4)I(5) is presented. Then, based on the spectral positions of the A(1) and A(2) peaks, we determined that. the Rb(0.5)Cs(0.5)A(4)I(5) exciton coupling energy R-ex is 0.21 eV, the forbidden zone width E-g is 3.82eV and the exciton radius a(ex) is 0.70nm. Furthermore, the ionic conductivities of superionic conductor thin films of RbAg4I5 and Rb(0.5)Cs(0.5)A(4)I(5) and their mixture film are investigated, respectively, in the temperature range 303K-393K.
