Abstract
Mn-doped CdS nanoparticles (NPs) have been synthesized by co-precipitation method and effect of Mn concentration on the structural, photoluminescence and photoconductivity properties have been studied. The X-ray diffraction (XRD) patterns show that the synthesized NPs have a cubical (zinc blende) phase. The clear lattice fringes in the high-resolution transmission electron microscopy (HRTEM) image, and selected area electron diffraction (SAED) patterns with bright circular rings with spots further confirms cubical nature. The estimated average particle size is found to be ∼3.1 nm by TEM image. UV–visible (UV–vis) absorption spectroscopy is used to calculate band-gap of material and blue shift in absorption peak indicates quantum size confinement effect. In photoconductivity study, variation of photocurrent with voltage on ln–ln scale is found to follow power law superlinearly due to injection of additional charge carriers from one of the electrodes. The growth and decay in photocurrent spectra exhibit anomalous behaviors which may be attributed to photo-induced chemisorptions of oxygen molecules on surface of NPs. A significant improvement in photocurrent has been observed in Mn-doped CdS NPs with concentration of Mn as 3 mol% as compared to un-doped CdS NPs. Photoluminescence (PL) spectra of un-doped as well as Mn-doped CdS NPs have one emission peak centered at ∼526 nm whereas Mn-doped CdS NPs show one additional emission peak centered at ∼575 nm which may be assigned to 4T 1 → 6A 1 transitions of Mn 2+.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
