Effects of chemical affinity and injection speed of Se and Te precursors on the development kinetic and optical properties of ternary alloyed CdTe1−xSex nanocrystals
P. T. Tho, N. D. Vinh, H. T. Van, P. M. Tan, V. X. Hoa, N. T. Kien, N. T. Hien, N. T. K. Van, N. X. Ca
Journal of Physics and Chemistry of Solids
The fabrication of ternary alloyed CdTe1−xSex nanocrystals (NCs) is strongly influenced by the chemical affinities of Se2− and Te2− ions, which are very different from each other. Based on the synthesis procedure, we discovered two possible structures of the alloyed CdTe1−xSex NCs: homogeneous alloyed and gradient alloyed. It was clear that the formation of two different alloyed NC types caused the different results of the emission spectra of ternary alloyed CdTe1−xSex NCs in previous studies. Careful photoluminescence and Raman scattering studies revealed that the formation of the homogeneous alloyed structure or gradient alloyed structure of CdTe1−xSex NCs depended on the injecting method the Se2− and Te2− ions. By slowly injecting the Se2− and Te2− ions into the solution containing Cd2+ ions at 290 °C and annealing the solution for a given period, homogeneous ternary alloyed CdTe1−xSex NCs were fabricated.
Absorption, Optical properties, Solid state, Materials