Photoluminescence analysis of laser-deposited CdS films

Selective Atmospheric Pressure Chemical Vapor Deposition Route to CdS Arrays, Nanowires, and Nanocombs

“…Previous studies of CdS thin films show that with an increase in temperature (from 0 K to 200 K), the PL peak energy shifts to lower energy (from 2.45 eV to 2.4 eV) and the PL spectrum broadens. [17] For CdS quantum dots (average size 6.5 nm with a standard deviation of 1.5 nm), the PL peak shifts to 490±500 nm due to their ultrasmall. [18] Therefore, the broad peak centered at 519 nm in Figure 8, which is slightly shifted to lower energy due to the measuring temperature, should correspond to the bandgap of CdS.…”

Optical and photoelectrical properties of CdSx Se1–x films produced by screen‐printing technology

“…The deep level luminescence is found to have a lower integrated intensity than the near band-edge one. The observed deep levels in CdS-CdSe solid solutions are typically attributed to sulfur and selenium vacancies or extrinsic defects, their reduction being indicative of the good stoichiometry and high purity of the material [17,19]. Figure 6 represents the photoconducance spectra for the sintered CdS x Se 1-x films at different values of x.…”

<title>Pulsed laser deposition of ZnS<formula><inf><roman>x</roman></inf></formula>Se<formula><inf><roman>1-x</roman></inf></formula>and CdS<formula><inf><roman>x</roman></inf></formula>Se<formula><inf><roman>1-x</roman></inf></formula>thin films on quartz: measurements of energy gap, absorption coefficient, and refractive index</title>

“…where TMO and TmO are the transmittance values for the same wavelength at the maximum and minimum points as evaluated from the interpolating curves and s is the substrate transmittance .The thin film average optical thicknesses of the samples can be also calculated in first approximation by using the formula (3) where nel and ne2 are the refractive index for two adiacent maxima (or minima) respectively at X and ?2. The calculated refractive index values have been represented as a function of the wavelength and some of these data have been fitted by using the classical Cauchy formula: n(X)=+d (4) allowing the calculation of the n(0) value.…”

“…5h an example of the typical transmittance spectrum of CdSSe thin film is presented. [3], it was deduced thin films grow in cubic phase on the amorphous quartz substrates. The calculation of the real part of the refractive index was made by not considering this effect, but data analysis is still in progress to include it.…”