The kinetics of the formation of CdSe nanocrystals in sodium-zinc-silica glass

Size-dependent bandgap and particle size distribution of colloidal semiconductor nanocrystals

“…( 13)] combined with our bandgap equation [Eq. (2)]. Although the absorption based PSD furnishes a good estimate for the most probable radius (0.79 nm), the distribution is highly symmetrical and much sharper than those obtained from analysis of both the AFM image and the photoluminescence spectrum.…”

“…Motivated by Ekimov's first experimental observation of the size dependence of nanocrystal optical properties in semiconductor-doped glasses 1,2 , Efros and Efros conducted pioneering theoretical investigations of quantum confinement effects in semiconductor spherical microcrystallites 3 . In the framework of the effective mass approximation for the confined charge carriers, interband optical absorption coefficients were calculated in two limiting cases or the so-called quantum confinement regimes, depending on the ratio of the crystallite radius ( ) to the effective Bohr radius of the electron-hole pair ( ): the strong confinement limit ( ⁄ , individual particle confinement regime) and the weak confinement limit ( ⁄ , exciton confinement regime).…”

Polarized emission of CdSe nanocrystals in magnetic field: the role of phonon-assisted recombination of the dark exciton

“…To isolate the nanostructured CdSe phase, small pieces of the initial glass were heat-treated under isothermal conditions in a two-stage treatment mode, which allows preparation of high quality samples with very low size dispersion of the CdSe nanocrystals (standard deviation < 5% as shown in Ref. 55). Precipitation of wurtzite modification of CdSe phase was also evidenced there.…”

“…Using the data on kinetics of CdSe crystallites growth given in Ref. 55, we determined the heat treatment condition to prepare CdSe nanocrystals with different diameters in the range from 3.3 nm up to 6.1 nm. We label the samples with names starting with D followed by their diameter in nanometers.…”

Observation of terahertz radiation absorption in CdSe quantum dots

“…7 The kinetics of the formation of CdSe nanocrystals was studied thoroughly in the paper. 8 The SAXS technique was used to determine the radius of gyration Rg of scattering CdSe nanocrystals (the Guinier radius) from the slope of linear segments in the dependences of the logarithm of the scattering intensity on the square of the scattering angle. The geometric sizes of nanocrystals were determined within the approximation of scattering by monodisperse spherical particles of radius R (R = 1.29Rg).…”