By Jonathan J. Scragg
Jonathan Scragg files his paintings on a really promising fabric compatible to be used in sunlight cells. Copper Zinc Tin Sulfide (CZTS) is a reasonably priced, earth-abundant fabric compatible for big scale deployment in photovoltaics. Jonathan pioneered and optimized a good value path to this fabric related to electroplating of the 3 metals involved, via quick thermal processing (RTP) in sulfur vapour. His fantastically targeted RTP stories – mixed with concepts akin to XRD, EDX and Raman – display the complicated relationships among composition, processing and photovoltaic functionality. This extraordinary thesis contributes to the improvement of fresh, sustainable and replacement assets of energy
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Additional info for Copper Zinc Tin Sulfide Thin Films for Photovoltaics: Synthesis and Characterisation by Electrochemical Methods
Example text
The first experiment that should be carried out when a new electrochemical system is being studied is to measure this dependence of current upon working electrode potential, since the current flowing is a direct measure of 12 2 Electrodeposition of Metallic Precursors Fig. 3 Diagram of a threeelectrode electrochemical cell undergoing electrodeposition of Cu from a solution of CuSO4. The value of Ewe is controlled as desired; the value of Ece is set by the potentiostat the rate of the electrochemical reactions occurring at the electrode surface.
The curve is the same regardless of the direction of the potential scan. Examples are shown in Fig. 4, where the curve has been plotted as a function of the applied potential, E. Now consider the situation where the working electrode consists of an inert conductive substrate with only a thin layer of the metal at its surface—for example after a small amount of metal has just been electrodeposited. Then, when the overpotential is positive and oxidation occurs, there is only a finite amount of material available for oxidation.
This neglects any interactions between the metals, such as preferred alloy formation or redox reactions occurring in solution. Since the stability of metal ions in aqueous solutions depends on the pH, but the range of stability depends on the particular ion, complexing agents and other additives are generally needed to keep the electrolyte 20 2 Electrodeposition of Metallic Precursors stable over time, and these components have their own influence on the deposition process for each metal. All of the above means that targeting a particular composition using a co-deposition process is non-trivial, and adjusting the composition in a rational manner is very difficult.