Two-photon-excited green emission and its dichroic shift of oriented thin-film CdS on glass formed by laser deposition

Abstract

The photoluminescence of oriented thin-film CdS on glass formed by laser deposition was investigated employing 200 fs, 1.54 eV laser pulses at room temperature. The ultrafast excitation caused a two-photon absorption process, which results in purely green emission at the band gap. The spectra are fitted very well by the application of the van Roosbroeck–Shockley relation, density of states, and Urbach’s rule demonstrating the intrinsic character of the radiative recombination. It is further shown that the energy position of the emission peak depends on the polarization of the impinging laser beam due to the dichroism of the highly oriented films.

CdS thin films formed on flexible plastic substrates by pulsed-laser deposition

“…The result shown in figure 3 was obtained with an electric field of 100 V cm −1 at room temperature. The maximum PC (and therefore the gap energy as well) is shifted towards higher energies beyond 2.5 eV in comparison with previous PC measurements [12], which showed band gap energies of 2.45 eV for films with the c-axis orientation perpendicular to the substrate. It is well known that the band gap energy depends on the particle size, crystal structure, and strain in the film.…”

“…The films were formed with a continuous wave (CW) laser [6] or pulsed laser beams in the nano-and femtosecond regimes [7,8], and recently, heteropairing of PLD CdS with cadmium telluride (CdTe) on indium tin oxide (ITO) glass substrates exhibited potential for photovoltaic applications [9]. Emphasizing additional technological applications in optics and optoelectronics, in our previous works, thin-film PLD CdS deposited on glass was used for the realization of green lasers and the formation of oriented dichroic films [10][11][12][13]. In addition, we fabricated a hybrid photovoltaic device based on the merger of PLD CdS on glass with a di-isoquinoline perylene derivative [14].…”

Deposition of Nanostructured CdS Thin Films by Thermal Evaporation Method: Effect of Substrate Temperature

“…Different methods have been reported for the deposition of CdS thin films, including vacuum evaporation [ 11 , 12 ], chemical bath deposition (CBD) [ 13 , 14 ], closed space sublimation (CCS) [ 15 ], spray pyrolysis [ 16 , 17 ], successive ionic layer adsorption and reaction (SILAR) [ 18 ], pulsed laser deposition (PLD) [ 19 , 20 , 21 ] and sol-gel [ 22 ]. Each technique produces films with different properties, which should be optimized for specific applications.…”

Optical and Morphological Studies of Electrodeposited CdS Thin Film Grown at Different Deposition Times from Acetate Precursor

“…[18][19][20] In the deposition of CdS thin films, deposition techniques and their associated parameters have significant influence on the physical and chemical properties of the thin films. [21][22][23] CdS thin films can be deposited by different techniques including electrodeposition, 24 chemical bath deposition, 25 sputtering, 26 metal organic chemical vapor deposition, 27 pulsed laser deposition, 28 close space sublimation, 29 screen printing, 30 Sol-gel, 31 and physical vapor deposition. 32 In photovoltaic solar cell research, researchers main focus is on two basic issues: (i) increasing the conversion efficiency of solar panels, and (ii) reducing the cost of solar panels.…”