文档介绍：Solar aspects of papers
Thin film solar cells – promising technology – dr Piotr Panek
Solar cells can be divided into two main groups: wafer based and thin films. The major drawbacks of wafer solar cells are that the Czochralski or casting process consumes a large amount of electrical power and when the wafers are cutting, there is a considerable wastage of crystal of about 50 %. Unlike crystalline silicon solar module manufacturing, in which the cells are constructed first and later interconnected, the creation of thin-film modules in the process in reverse. First, the absorber and conductive layers are deposited on the substrate and than separated so that they are monolithically connected in series. The interconnection is necessary to convert the high current and low voltage output into a low current and high voltage. This minimizes ohmic power losses, which scale as the square of the current. The most prominent thin film solar cells are: CdTe, CIS and a-Si/µc-Si or a-Si/mc-Si [1]. Today thin film solar cells have a market share of about 12 %.
Cadmium telluride (CdTe) is a direct-bandgap material with energy of eV and for this reason is favorable for conversion of the solar spectrum into electricity [2]. The layers are deposited onto the glass substrate used close-spaced sublimation (CSS) and chemical bath deposition (CBD) methods with the sequence presented in