Optical properties of CdS nanocrystalline films prepared by a precipitation technique

CdS semiconductor films of different crystalline size have been grown by a precipitation technique. The crystalline sizes were controlled by the reaction time period, pH/temperature of the solution and thickness of the deposit. From the optical absorption, the band gap of bulk-CdS is found to be 2.4...

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Bibliographic Details
Published in:Thin solid films 1998-06, Vol.322 (1), p.21-27
Main Authors: Nanda, K.K, Sarangi, S.N, Mohanty, S, Sahu, S.N
Format: Article
Language:English
Subjects:
Amorphous semiconductors
glasses
Amorphous semiconductors
glasses
nanocrystalline materials
Cadmium sulfide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Luminescence
Nanostructures
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of specific thin films
Photovoltage
Physics
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Summary:CdS semiconductor films of different crystalline size have been grown by a precipitation technique. The crystalline sizes were controlled by the reaction time period, pH/temperature of the solution and thickness of the deposit. From the optical absorption, the band gap of bulk-CdS is found to be 2.405 eV and is increased to 2.97 eV for nanocrystalline samples of average crystalline size 5.0 nm estimated from the blue shift. AFM analysis were performed to estimate the average crystalline size. Photoluminescence studies of CdS nanocrystalline samples show a red shift. The intensity of red luminescence (∼1.8 eV) decreases and its peak position shifts to the lower energy upon increasing the particle size. Photovoltage as a function of crystalline size/band gap has been studied using a photoelectrochemical solar cell configuration Ti/CdS/S 2−, S 2 2−/Pt.
ISSN:0040-6090
1879-2731
DOI:10.1016/S0040-6090(97)01015-8