Straturile nanostructurate ZnO au fost sintetizate din soluții chimice prin metoda pirolizei pulverizate. Prin analiza difracției cu raze X (XRD) și a spectroscopiei UV-Vis au fost studiate efectele variației concentrației de aluminiu asupra proprietăților optice ale straturilor nanostructurate de ZnO. Concentrația aluminiului în soluția inițială a fost fixată la 0, 1, 2, 3 și 5%. Analiza difracției cu raze X (XRD) confirmă că doparea cu 1% de aluminiu, în comparație cu celelalte concentrații, îmbunătățește structura cristalină. Cu creșterea concentrației de aluminiu dimensiunea cristalitelor se mic­șorează. Studiul spectroscopiei UV-Vis a straturilor subțiri indică o transmitanță sporită (~90%) în regiunea vizibilă a spectrului energetic cu lărgimea benzii interzise de 3,23 eV pentru ZnO nedopat și de 3,32 eV pentru ZnO dopat cu Al, care este aproape de valoarea „bulk” a ZnO (3,36 eV).



ZnO nanostructured layers were synthesized from chemical solutions by the spray pyrolysis method. By using X-ray diffraction (XRD) method and UV-Vis spectroscopy, the effects of varying aluminium concentration on the optical properties of ZnO nanostructured layers were studied. The concentration of aluminium was set at 0, 1, 2, 3 and 5% in the initial solution. X-ray diffraction (XRD) analysis confirms that doping with 1% aluminium, compared to other concentrations, improves the crystal structure. As the concentration of Al increases, the size of the crystallites decreases. The study of UV-Vis spectroscopy of thin layers indicates an increased transmittance (~ 90%) in the visible region of the energy spectrum with a bandwidth of 3.23 eV for undoped ZnO and 3.32 eV for Al-doped ZnO, which is close to the “bulk” value of ZnO (3.36 eV).


ZnO, transmittance, reflectance, absorbance, spray pyrolysis, doped.

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