بررسي تغييرات گاف انرژي و تعيين اندازه نقطه هاي كوانتومي PBS تهيه شده در محلول كلوييدي

Study of band gap and determination of size of PbS quantum dots synthesized by colloidal solution

PbS semiconductor non-crystals have been synthesized in order to study the modification of their electronic structures and optical properties in relation to their size. The synthesis has been carried out by using the techniques of colloidal chemistry. Strong quantum confinement behavior has been observed based on the analysis of optical spectra of these particles. The average particle size approximated by x-ray line width and hyperbolic band model calculation. Heterogeneous broadening of optical spectrum is studied finally.