Giant UV-sensitivity of ion beam irradiated nanocrystalline CdS thin films

Abstract

A highly sensitive UV-detector is devised for the first time from ion beam irradiated nanocrystalline CdS thin films. The sensor exhibits improvements in the responsivity, photosensitivity, and efficiency as a function of ion fluence.

Swift heavy ion induced structural phase generation and enhanced luminescence from CdS based nanocomposites

“…SHII induced improvement in crystallinity i.e. growth of CdS/Cd 0.99 Ag 0.01 S nanoparticlesin SiO 2 is in accordance to previous reports[1,16,26,27]. It maybe due to SHII induced of particles due to annealing effects produced by ion beam, which results in an increase in the particle size[1, 16, 26] and SHI induced Ostwald ripening [1, 16, 26, 27] i.e.…”

“…However, there has been negligible concern on influence of post deposition treatment particularly swift heavy ion irradiation (SHII) on the modification of various properties of this system. It is well worth to mention here that the scope of ion beam induced multifunctionality has been extended for miscellaneous applications including gas sensing [13], photodiode [14], thermoelectricity [15], UV-sensing [1] along with material engineering and characterization in recent years. These advancements are resulting as a consequences of SHII induced defect engineering [16,17], nanophase formation [18,19], crystal lattice engineering [20,21] high pressure phase generation [22] etc.…”

“…All the samples show two emission peaks centered at ~ 2.34eV and 3.05 eV. The peak centered at ~2.34 eV is assigned for green emission (GE) due to transition of S-vacancy donors to the valence band and conduction band to S-interstitial[1,16,26]. PL spectra also indicate that Ag doping does not create any new trap levels between the conduction and valance band of CdS.…”

CdS nanodroplets over silica microballs for efficient room-temperature LPG detection

“…The procedure used here for the growth of nc-CdS and CdS:SiO 2 NCTFs by pulsed laser deposition (PLD) setup is fully described elsewhere. 12,13 All the samples investigated were synthesized by PLD by guiding and focusing the third harmonic of a continuum Nd:YAG laser of energy 220 mJ at a wavelength of 355 nm with a repetition rate of 10 Hz and a pulse width of 10 ns onto the rotating target mounted at an oblique angle of 30 to the direction of the incident laser beam. For CdS thin lm deposition, chemically synthesized CdS quantum dot (QD) 14 pellets were used as a target, whereas a commercially purchased (Sigma Aldrich Ltd., USA) SiO 2 target was also used along with a CdS target to deposit CdS:SiO 2 NCTFs.…”

“…Structural and optical studies were carried out using basic characterization techniques, viz., glancing angle X-ray diffraction with Cu K a of wavelength 1.54Å, micro-Raman spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectroscopy and are reported elsewhere in detail. 12,13 The temperature-dependent photoluminescence study in the temperature range of 20-560 K was carried out to explore the temperature sensing properties of the nanocomposite lms. 15 In the present study, the surface morphology and microstructure of the lms were analyzed using scanning electron microscopy (SEM), MIRA\\TESCAN FESEM.…”