The first generation refers to crystalline silicon photovoltaic power generation, which is divided into monocrystalline silicon and polycrystalline silicon. It is widely used, and China occupies a large share in this market.
The second generation refers to a wide variety of thin-film batteries, with the advantage of less material consumption and the biggest disadvantage that the photoelectric conversion rate is only half that of crystalline silicon. The main varieties are: amorphous, nanocrystalline, microcrystalline and other silicon films; A thin film composed of copper, indium, gallium and selenium; Cadmium telluride thin film; A thin film composed of copper, zinc, selenium, sulfur and tin; A new variety is gallium arsenide thin film battery.
The core of the third generation photovoltaic power generation technology is the introduction of modern optical technology. From semiconductor technology to modern optical technology, the core technology is focusing. According to Einstein's photoelectric law, the power generation is directly proportional to the intensity of light, and concentrating light can generate more electricity. The key is to concentrate light very evenly, because if it is not uniform, the equipment will generate electricity according to the weakest part. Uniform focusing is a new technology developed in recent years, which is called adaptive optics without light image and has high technical content. Through such condensation, the conversion rate of the battery can be greatly improved.