SnTe polycrystalline thin films are deposited by the vacuum evaporation method from the former SnTe crystals, and their microstructure, electrical properties, and surface appearance are studied.

In this paper,the absorption coefficient α(λ) ,the extinction coefficient k(λ) ,the refractive index n(λ) and the optical energy gap E g(λ) of CuInSe 2 polycrystalline thin films were studied by the properties of the reflection and transmission.

AlSb polycrystalline thin films are prepared by vacuum co-evaporation and post-annealing.

CdS/CdTe polycrystalline thin film is a new type of high efficiency and low-cost solar cells, which is most promising for application in refrigeration, because it has many advantages such as few crystalline defects, large gap of energy, high stability, inexpensive and convenient for large area deposition.

PbTe polycrystalline thin films with 5 different stoichiometric proportions were deposited by the Vacuum Evaporation m.

The polycrystalline thin film CdTe solar cell is one of the thin film solar cells which are mainly investigated.

Two methods for preparing the doped polysilicon films ,the plasma-enhanced chemicalvapor deposition (PECVD)and the low-pressure chemical vapor deposition(LPCVD),havebeen studied experimentally.

Based on a theoretical model for LPCVD, computer simulation of PECVD polysilicon films has been performed by employing the concept of "electron temperature".