Influence of Buffer Agent Concentration on the Optical Properties from CdS Nanocrystals on Silicon Nanoporous Pillar Array

Abstract EN

The chemical bath deposition (CBD) method is very crucial to the reaction rate.

Generally, the rate can be controlled through tuning buffer agent concentration.

CdS nanocrystals on the silicon nanoporous pillar array (CdS/Si-NPA) have been prepared through the CBD method.

By varying the buffer agent concentration, the reaction rates can be tuned.

The diffraction peaks of hexagonal CdS and Cd can be observed due to the reduction of Cd2+ caused by the silicon nanoporous pillar array.

The average size of CdS nanocrystals is decreased with the increasing buffer agent concentration and the optical band gaps from CdS nanocrystals are increased.

From the photoluminescence of CdS/Si-NPA, it can be observed that the blue emissions are independent of the buffer agent concentration and the green emissions show blue shift with the increasing buffer agent concentration.