Raman scattering for the size of CdSe and CdS nanocrystals and comparison with other techniques

Morphology and band gap controlled AACVD of CdSe and CdS Se1− thin films using novel single source precursors: Bis(diethyldithio/diselenocarbamato)cadmium(II)

“…In CdS type materials, the in-corporation of cations (Cd) produce shallow donor levels like S vacancies (with ionisation energies ∼0.03 eV) where as that of anions (S or Se) introduce deep acceptor levels (Cd vacancies with ionisation energy typically ∼1.1 eV for sulphides and ∼0.6 eV for selenides) for the charge compensation of the system [48]. It can be seen that as the S content increased the emission maximum shifted towards lower wave length region which agreed with the previous literature reports [18,[46][47][48][49][50][51]. The band gaps of both films were estimated by Tauc plotsof (ahν) 2 vs hν (Fig.…”

“…7(a)). There were some minor peaks at 260 and 310 cm À 1 which were corresponding to CdS phases (for CdS first-order longitudinal optical phonon (LO) modes at 305 cm À 1 and a low-frequency wing at 295 cm À 1 [18,[48][49][50].…”

Simple preparation of a cadmium selenide–montmorillonite hybrid

“…2b). Raman spectra of CdSe nanocrystals with particle sizes of 3.52 and 2.26 nm showed the peak positions at 204.8 and 201.4 nm [24]. These observations confirmed the formation of CdSe particles in montmorillonite.…”

Photoelectrochemical and Raman characterization of In2O3 mesoporous films sensitized by CdS nanoparticles

“…This effect can be explained in the following way: according to wavevector-relaxation [17] and continuum [18–19] models, the decrease of the size of the nanoparticles leads to a monotonic red shift of the phonon energy relative to the value characteristic of a bulk crystal. This effect was observed by a number of researchers who studied nanocrystals produced by colloidal chemistry methods [20–22]. However, in our experiments where the nanoparticles were grown in situ (directly on the indium oxide substrate) it is also necessary to take into account their interaction with the host material.…”