Conversion efficiency is the ratio of battery output power to incident solar power. Specifically, the battery is exposed to sunlight with a certain power density. After the battery absorbs photons, the material excites the material to generate carriers. The carrier that contributes to the battery performance is eventually collected by the electrode. The electrodes naturally carry current during the collection process. , Which corresponds to the voltage characteristic, that is, the output power, and the conversion efficiency is obtained by dividing the generated power by the power of the incident light.

        Theoretical formula: efficiency = (open circuit voltage * short circuit current * curve coefficient) / incident optical power density = battery output power density / incident optical power density.

        There are many factors that affect the conversion efficiency of solar cells. 1. Sunlight intensity, solar cell is a device that converts sunlight into electricity. Under normal conditions, the efficiency of solar cells will increase as the light intensity increases. In addition, the efficiency of solar cells is related to the overall climatic conditions of the installation site. 2. Battery materials. Different materials have different light absorption coefficient, band gap, quantum efficiency and cell efficiency. Generally, the optical coefficient of monocrystalline silicon/polycrystalline silicon is much smaller than that of amorphous silicon. Therefore, the thickness of amorphous silicon solar cells is monocrystalline silicon/polycrystalline silicon to better absorb sunlight, only monocrystalline silicon/polycrystalline silicon 1%. The thickness of crystalline silicon.