Effect of Size and Shape on Refractive Index, Dielectric Constant and Band Gap of Semiconducting Nanowire

Background: On decreasing size down to nanoscale, the optical and electronics properties of semiconductors become tunable instead of being constant. Methods: Based on classical and quantum approach, a simple integrated theoretical model is presented without any adjustable parameter to study the size and shape effect on the refractive index, dielectric constant and bang gap of the semiconducting nanowire. The model predicts that with the decrease in the size of the semiconducting nanowire, dielectric constant and refractive index reduces, whereas as band gap enhances. Results: The theory reveals that the behavior exhibited by cylindrical and noncylindrical nanowires differs due to their different shape factors. Conclusion: Agreement of our predicted results with the available experimental and simulated results and with the other theoretical models validates the present work.