Introduction In recent years, the cost of inorganic nanocrystalline semiconductor thin film solar cell has significantly reduced, however to make it viable, its efficiency needs to be enhanced. For this the thin film... [ view full abstract ]
Introduction
In recent years, the cost of inorganic nanocrystalline semiconductor thin film solar cell has significantly reduced, however to make it viable, its efficiency needs to be enhanced. For this the thin film nanostructure geometry would be very useful for fundamental studies and technical applications. Electrical, optical and mechanical properties which depend on structure, size and dimension need to be investigated. This has great potential to generate structures of suitable properties under control parameters which is the dire need of today’s many fields of modern science and technology.
In nature, biological reactions are influenced more or less under the sun light photon energy and resulting in nature’s beauty of different colors, shapes and sizes. So photon energy might become the important vital parameter to manipulate and control chemical reaction.
Methods:
In the present work, the influence of different single color light illumination on the chemical bath deposition of CdSe thin films was investigated by means of X-ray diffraction, Scanning electron microscopy, Energy Dispersive Spectroscopy (EDS), photoluminescence spectroscopy(PL) and UV-Vis-NIR spectrophotometer respectively. Films are deposited on glass, stainless steel and conducting glass substrates at room temperature for various time periods of Cd and Se ion source solutions for suitable Cd/Se source solutions ratio under darkness, red, green and blue color Light Emiting Diodes(LEDs) illuminations condition with constant stirring speed.
Results:
The study reveals change in film color appearance and band gap change. Solution color changed from colorless, pale yellow, orange and finally turned into reddish dark brown. This reveals the growth of grain size from nano scale to micro scale. Attempt has been made to study the structural, physical and optical properties by the influence of single color light illumination on the growth of CdSe nanocrystallite.
Discussion:
1. under the different single color light illumination conditions, remarkable changes in surface morphology, band gap, % Transmittance and absorption were observed.
2. Extra shoulder peak in XRD pattern was observed under green and blue color illumination conditions.
Keywords: Nanocrystalline CdSe, Chemical bath deposition, XRD, SEM
*To whom the correspondence to be addressed: Sanjay W. Pawar, E-mail: sanjaypawar_nsk@yahoo.co.in,
Phone No. +919850043749
