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GROWTH AND CHARACTERISATION OF ZINC-CADMIUM SULPHIDE THIN FILMS … According to the literature data [17], the deposition of ternary materials by chemical bath methods is a problem due to the different hydrolytic stabilities of the two metals. This is illustrated with the fact that, ZnCdS films obtained by CBD show properties that vary non-linearly with the bath composition. The packing density of ZnCdS thin films varies non-monotonically with Cd 2+ - concentration, thus suggesting the existence of more different competitive deposition processes with consequences on the film homogeneity (Fig. 1). Figure 1. Packing density of ZnCdS versus Cd 2+ -concentration from the chemical deposition bath The optical properties of ZnCdS thin films are strongly influenced by the deposition technique and CBD bath composition. The transmittance spectra of ZnCdS thin films obtained from chemical bath with different Cd 2+ amounts are depicted in figure 2. UV-Vis transmittance spectra illustrate the non-monotonous variation of film transparency with Cd 2+ content. Films obtained from bath containing 5-10 mol% Cd 2+ are the most transparent and optical homogeneous. The absorption edge (Fig. 3) shifts non-linearly from UV domain (~ 300 nm for 0 mol% Cd 2+ ) to blue domain (~455 nm for 100 mol% Cd 2+ ). Evaluation is based on the wavelength corresponding to 0.1 % transmittance values. UV-Vis reflectance spectra (Fig. 4) illustrate that the behavior of ZnCdS films is very different in respect with their specular reflectivity. The reflection peak shifts non-monotonically from ultraviolet (0 mol% Cd 2+ ) to red domain (100 mol% Cd 2+ ). The most light reflecting films are obtained in bath containing 5 ÷ 20 mol % Cd 2+ . 205
206 MARIA ŞTEFAN, IOAN BÂLDEA, RODICA GRECU ET ALL Figure 2. Transmittance spectra of ZnCdS thin films obtained from chemical bath with different Cd 2+ amounts Figure 3. Variation of absorption edge position of ZnCdS thin films with Cd 2+ -amount from chemical bath The specular reflectance was evaluated as difference between total reflectance (measured at 8° incidence) and diffuse reflectance (measured at 0° incidence).
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R /(mol m -2 s -1 ) 0.06 0.05 0.04
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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6 PROFESSOR IOAN BÂLDEA AT HIS 70
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
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STUDIES ON WO3 THIN FILMS PREPARED
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PREPARATION AND CHARACTERIZATION OF
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32 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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34 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
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38 ANA-MARIA CORMOS, JOZSEF GASPAR,
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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50 EUGEN DARVASI, LADISLAU KÉKEDY-
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MATHEMATICAL MODELING FOR THE CRYST
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STUDY OF THE CHROMATOGRAPHIC RETENT
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LOWER RIM SILYL SUBSTITUTED CALIX[8
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THE INTERACTION OF SILVER NANOPARTI
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OPTIMISATION OF COPPER REMOVAL FROM
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MELINDA-HAYDEE KOVACS, DUMITRU RIST
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IRON DOPED CARBON AEROGEL AS CATALY
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128 ANDRADA MĂICĂNEANU, HOREA BED
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ANDRADA MĂICĂNEANU, HOREA BEDELEA
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CRISTINA MIHALI, GABRIELA OPREA, EL
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144 CRISTINA MIHALI, GABRIELA OPREA
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146 Interfering ion, J - I - DBS -
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CONCLUSIONS 148 CRISTINA MIHALI, GA
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150 CRISTINA MIHALI, GABRIELA OPREA
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Page 187 and 188: 194 OCTAVIAN STAICU, VALENTIN MUNTE
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CODRUTA VARODI, DELIA GLIGOR, LEVEN
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260 CODRUTA VARODI, DELIA GLIGOR, L
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262 CODRUTA VARODI, DELIA GLIGOR, L
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PHARMACOKINETIC INTERACTION BETWEEN
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