High orientation CdS thin films grown by pulsed laser and thermal evaporation

Abstract

Undoped CdS films have been grown by pulsed laser evaporation (PLE) and thermal evaporation (TE) techniques on Corning's 7059 glass at a substrate temperature between room temperature and 250"C. The deposition rates are 0.07 Als for PLE and 60 Als for the TE technique. These as-deposited films have high (002) preferred orientation by both techniques even without preheating the substrate. However, films deposited by PLE have more preferred orientation and larger grain size. These features make the PLE films have sharper Raman peaks, smaner Raman shift of surface mode and more overtones of longitudinal optical phonon mode observed than those in TE films. The transparency of PLE or TE films for wavelengths which are larger than that of absorption edge is around 90% on average.

Structural characterization of CdS thin film on quartz formed by femtosecond pulsed laser deposition at high temperature

“…Cadmium sulfide (CdS) is a group II-VI semiconductor [1] with a direct band gap of 2.48 eV at room temperature [2], which has potential application in optoelectronics. Extensive research has been done in the last two decades on CdS thin films, specifically on the applications in large area electronic devices like field-effect transistors, solar cells [3], laser heterostructures for emission in the visible spectral range photoconductors [4], optical thin films filter and nonlinear integrated optical devices [5].…”

The influence of the silicon substrate temperature on structural and optical properties of thin-film cadmium sulfide formed with femtosecond laser deposition

“…Extensive research has been done in the last two decades on CdS thin films, mainly due to its applications in electronic devices like thin films field-effect transistors, solar cells, photoconductors, optical thin films filter, nonlinear integrated optical devices and light emitting diodes (LEDs) or laser heterostructures for emission in the visible spectral range [1][2][3][4][5][6]. For these purposes, CdS thin films have been deposited by a wide variety of techniques, including spray pyrolysis (SP), close space vapor transport (CSVT), vacuum evaporation [7], chemical bath deposition (CBD), solution growth technique (SGT) [8], RF sputtering (Sp), chemical vapor deposition (CVD) and pulsed laser deposition (PLD), etc.…”

Confinement of CdS nanocrystals in a sonogel matrix

“…However, the 1LO band appears at 301 cm -1 and its corresponding overtone, 2LO, at 602 cm -1 . These band shifts to lower frequencies as to the bulk CdS are due to the effect of particle size [10,[16][17][18][19] on the vibrational properties in small crystallites. When the composite is treated at 800~ in N2 flow, the Raman peaks present higher intensity, due to an increase in the composite particle density during sintering [20].…”