3 research outputs found
Band Gap Bowing at Nanoscale: Investigation of CdS<sub><i>x</i></sub>Se<sub>1–<i>x</i></sub> Alloy Quantum Dots through Cyclic Voltammetry and Density Functional Theory
The band gap bowing effect in oleic
acid-stabilized CdS<sub><i>x</i></sub>Se<sub>1–<i>x</i></sub> alloy quantum
dots (Q-dots) with varying composition has been studied experimentally
by means of cyclic voltammetry and theoretically using density functional
theory based calculations. Distinct cathodic and anodic peaks observed
in the cyclic voltammograms of diffusing quantum dots alloy are attributed
to the respective conduction and valence band edges. The quasi-particle
gap values determined from voltammetric measurements are compared
with interband transition peaks in UV–vis and PL spectra. Electronic
structure for alloy Q-dots is determined computationally with projector
augmented wave method for a particular size of dots. The band gap
bowing is observed predominantly in the conduction band states. The
bowing parameter determined experimentally (0.45 eV) has been found
to be in good agreement with the one estimated from DFT (0.43 eV)