Characterization of Highly Efficient CdTe Thin Film Solar Cells by the Capacitance–Voltage Profiling Technique

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Abstract
The electrical properties of highly efficient CdTe thin film solar cells prepared by close-spaced sublimation (CSS) were investigated by capacitance–voltage (C–V) measurement. According to the dependence of the cell performance on the substrate temperature in the CSS process, the open-circuit voltage (V oc) increased with increasing the substrate temperature below 630°C. The carrier concentration profiles revealed that the net acceptor concentration exponentially increased from the CdS/CdTe interface to the rear and that the acceptor concentration increased with increasing substrate temperature. This result suggests that V oc is improved as a result of the increase in the acceptor concentration.

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