PREPARATION OF COPPER SULPHIDE BY ELECTROLYSIS AND SIMULTANEOUS DEPOSITION OF COPPER
The aim of the research was to demonstrate the possibility for forming copper sulphide of photopiles CdS - Cu-2S by cathodic reduction. 1. The possibility of producing a Cu-2S of a good stoichiometric ratio (1.99) on surfaces of about 10 cm**2 thanks to the use of an electrolyte containing a convenient masking agent (TRIEN). The extension to larger surfaces poses no problem. 2. The reaction time is quite high (10 to 20 mn). The reaction is only produced on passing a current, which allows an easy control of production. 3. According to experimental conditions, one can deposit a greater or smaller quality of copper at the same time as the Cu-2S. 4. A special technique for the formation of the collecting grid by cathodic deposit of gold has been developed. It consists principally of depositing the grid before the photovoltaic Cu-2S. 5. The best photopiles obtained had the following characteristics: Area: 1.5 cm**2, V-co = 0.51 V, I-cc = 22 mAcm**-2 Area: 1.5 cm**2, V-co = 0.51 V, I-cc = 22 mAcm**-2 , eta = 7% 6. The analysis the junction shows that there is no significant migration of copper during the deposit. The thermic treatment causes a less disturbed compensated zone to appear by the texture of the CdS than the deposits obtained by the exchange of ions. This would be favourable to the stability of the piles. 7. Some problems remain, in particular the deposit of copper on the grid at the time of the formation of the Cu-2S. Possibilities for improvements are proposed.
Bibliographic Reference: EUR 9842 FR (1985) MF, 63 P., BFR 150, BLOW-UP COPY BFR 315, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989125039800 / Last updated on: 1987-04-01
Available languages: fr