Abstract
In this work we have studied the properties of CdS films obtained by the chemical bath deposition technique. We studied the influence of pH control of the reaction solution on the structural and optical properties of chemically deposited CdS films. For this, we deposited two sets of CdS films on glass substrates using two different reaction solutions. The main difference between the solutions was that one included the use of a pH-10 NH4OH/NH4Cl controller solution or buffer, which produces a more uniform pH of the reaction solution during the film-growth process. Using each reaction solution, five CdS films were deposited at 80 °C, varying the deposition time from 15 to 120 minutes. The structural and optical properties of both sets of films were determined by X-ray diffraction and by absorption, transmission and reflection spectroscopy. The differences in the properties of the films were analyzed in terms of pH control.
Highlights
In recent decades many research groups have been interested in the study of CdS films[1,2,3,4,5,6,7,8,9,10,11,12], promoted by the excellent properties that make this material one of the most promising materials in the field of photovoltaic conversion energy
The studies on CdS film deposition have been focused on obtaining CdS films with better structural, electrical and optical properties, in order to increase their performance in optoelectronic devices, such as solar cells and thin-film transistors (TFT)
One of the most simple and widely used growth techniques to prepare CdS films is chemical bath deposition (CBD)[21,22], in which a substrate is immersed in an alkaline aqueous solution containing Cd2+ and S2– ions resulting from chemical reactions in the solution
Summary
In recent decades many research groups have been interested in the study of CdS films[1,2,3,4,5,6,7,8,9,10,11,12], promoted by the excellent properties that make this material one of the most promising materials in the field of photovoltaic conversion energy. The pH of the reaction solution is a very important factor for the films deposition by the DBQ technique and several works report on the effect of this parameter on the properties of CdS films[33,34] In these papers the pH of the reaction solution for different CBD processes is optimized to attain the best properties of the CdS layers. The differences between the reaction solutions was that in one of them ammonia was substituted completely by sodium citrate as the complexing agent and KOH and pH 10 buffer were included in the precursor solution to attain the pH required value and to control the pH of the solution during the whole deposition process Both kinds of deposited CdS films were studied to determine the influence of the pH control in the reaction solution on the properties of the films
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