Photosensitivity spectra of thin-film polycrystalline solar cells based on CdTe

Photocurrent losses in thin-film CdTe solar cells are investigated analytically for cells with a CdTe layer 3-7 microns and a transparent Cu1.8S layer about 400 A thick. It is shown that strong light absorption over the entire sensitivity region of the solar cells results in an increase of losses associated with the transport of main carriers to the transparent component. This problem can be effectively solved by using an intermediate semiconductor layer.