ZnO/CdS/CuGaSe/sub 2/ single crystal solar cells

The ZnO/CdS/CuGaSe/sub 2/ single crystal solar cells with thermally evaporated CdS layers have been prepared. The cells with undoped and In-doped oxygen free buffer layers CdS had a low open-circuit voltages in comparision with chemically deposited CdS buffer layers. The strong oxygen influence on open-circuit voltage of devices was established. It is shown that using of oxygen during ZnO films preparation by rf-sputtering lead to high open circuit voltages for devices with thermal evaporated CdS buffer layers.