Preparation and Properties of CdTe Polycrystalline Films for Solar Cells

摘要

The structure and characteristics of CdTe thin films are closely dependent on the whole deposition process in close-space sublimation (CSS). The physical mechanism of CSS was analyzed and the temperature distribution in CSS system was measured, and the influences of the increasing- temperature process and pressure on the preliminary nucleus creation were studied. The results indicate : the samples deposited at different pressures have a cubical structure of CdTe and the diffraction peaks of CdS and SnO_2 : F. As the atmosphere pressure increases, the crystal size of CdTe decreases, the rate of the transparency of the thin film decreases and the absorption side moves towards the short-wave direction. After a 4-minute depositing process with a substrate temperature of 500 deg C and a source temperature of 620 deg C, the polycrystalline thin films can be made, so the production of high- quality integrated cell with SnO_2 : F/CdS/CdTe/Au structure is hopeful.