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Thin-film silicon solar cells are mainly class compounds as well as three kinds of dye-sensitized thin film solar cells.

First, the silicon-based thin film solar cell
Silicon based thin film solar cell according to the specific material can be divided into amorphous silicon, polycrystalline silicon and microcrystalline silicon thin film solar cells. Among them, the amorphous silicon thin film solar cell due to the glass, stainless steel and developed for the substrate, it is considered to stage the best environmental performance of batteries. Its study began in 1976 and subsequently it caused a significant impact world widely.
Second, the thin film solar cell compounds

Compound semiconductor materials are mostly direct band gap, and a large band gap, so the use of thin-film solar cells produced compound has a large optical absorption coefficient, good radiation resistance and temperature coefficient characteristics. Compounds include gallium arsenide thin film solar cell, cadmium telluride, and copper indium selenide three kinds of thin film solar cells. Wherein the copper indium selenide thin film solar cells the most representative, their study began in the 1970s, Boeing developed by vacuum evaporation of copper indium selenide thin film solar cell efficiency of 9%. The study found that to copper indium selenide thin film solar cells in the incorporation of gallium, sulfur and other materials, the band gap can be adjusted to improve the conversion efficiency. US based NREL three-step co-evaporation method to obtain 19.9% efficiency, and has maintained the world record; until 2010, the German-based ZSW evaporation method, the efficiency to 20.3%. Domestic Nankai by evaporation of selenium method also received 14% efficiency. However, the use of rare elements indium and selenium are difficult to meet the large-scale production, so look for cheaper alternatives element becomes a hot topic.

Third, the dye-sensitized thin film solar cells
Dye-sensitized thin film solar cells is to mimic photosynthesis developed photoelectrochemical cell, low cost, simple process, light weight and high efficiency. ? In 1991, M.Gr tzel research team developed a 7.1% efficiency of dye-sensitized cells; in 2005, M.Gr tzel, who in turn increase efficiency to 12.3%. Domestic research on dye-sensitized thin film solar cell has also been close to the world advanced level, small area cell efficiency of 11%, while the Changchun should be developed C101 dye obtained 9% efficiency. However, the conversion efficiency, durability, and there is still much room for development stability, therefore, to find a low-cost, good performance dye is still the focus of current research.