Authors : Yu.A. Kryukov, E.Yu. Timalina, G.V. Tsepilov and A.N. Voropay
Abstract: The experimental studies of critical condensation temperatures during the deposition of cadmium sulfide and cadmium telluride films in a quasi-closed volume made it possible to determine the modes in which precipitation occurs under the conditions close to thermodynamically equilibrium ones and at substrate temperatures below the thermal destruction temperature of the polyimide films by Upilex company. The technological equipment adapted to vacuum equipment of electronics industry domestic enterprises was developed for the technical realization of these conditions. This equipment allows the sequential deposition of sulphide and cadmium telluride layers in a single technological cycle by condensation from a quasi-closed volume under the conditions close to thermodynamic equilibrium ones. At a deposition temperature of 434°C on polyimide substrates with an ITO film layer on the surface of which a nanoscale ZnO interlayer is located, CdS layers were obtained with the thickness of 0.3 μm of a stable hexagonal modification. On the surface of CdS layers at the temperatures below 440°C, CdTe layers were developed with the thickness of 4 μm of a stable cubic modification. The approbation of the CdS/CdTe heterosystems in the composition of flexible photoelectric converters shows that with the increase of cadmium telluride deposition temperature from 353-439°C, the efficiency ratio of these instrument structures increases from 10.5-12.2% which is caused by the short-circuit current density increase from 21.2-21.9 mA/cm2, no-load voltage from 788-820 mV and the filling factor of the light-volt-ampere characteristic from 0.625-0.680.
Yu.A. Kryukov, E.Yu. Timalina, G.V. Tsepilov and A.N. Voropay, 2017. Physical and Technical Conditions of Cadmium Sulfide and Cadmium Telluride Films Deposition in a Quasiclosed Space for Flexible Photoelectric Converters. Journal of Engineering and Applied Sciences, 12: 907-912.