What is the cause of the solar photovoltaic panels light attenuation?

After the completion of the solar module production, power test, component power is normal, but the customer receives the components, install and operate, it found that the power attenuation is bigger. This phenomenon is mostly caused by battery patches of light cause attenuation. This article system,

solar module production is completed, the component of power in power during the test is normal, but when customers receive components during installation and operation of power attenuation is very large. This kind of phenomenon is mainly caused by the light of the battery to attenuation. In this paper, the system and briefly describe the light induced attenuation phenomenon. Photovoltaic modules to light attenuation can be divided into two stages: initial light aging and decay. The first light attenuation, namely the output power of photovoltaic modules in the first few days of use is greatly reduced, but then stabilise. This kind of phenomenon is the main reason of the P type ( Boron doping) The boron - crystal silicon wafers Oxygen compound reduces the minority carrier lifetime. By changing the P type dopant and grain instead of boron, can effectively reduce the light attenuation. Or to light treatment, the cell makes the battery of the initial light induced attenuation occurs before the module manufacturing, pv modules can be the initial light induced attenuation control in a small range, also improves the output stability of the module. Photoinduced attenuation is more related to the battery manufacturers, and for components manufacturer, it is important to choose the high quality batteries to reduce the influence of photoinduced attenuation. Attenuation refers to the power decrease in the long-term use of aging is very slow. Main reason is related to battery slow attenuation and the solar photovoltaic power generation is also related to the performance degradation of packaging materials. Among them, the main ingredient material performance degradation is the main reason of the ultraviolet irradiation. Long-term exposure to the sun's ultraviolet rays to EVA and the back ( The structure of TPE) Ageing yellow, resulting in a decline in component light transmittance, thus resulting in a decline in power. This requires components manufacturers should strictly controlled, when choose EVA and the back material chosen must have excellent aging resistance, in order to reduce auxiliary components of power attenuation caused by material aging. As early as more than 30 years ago, people observed the P type ( Boron) The early light to the decay of the crystalline silicon solar cells, followed by a plenty of scientific research. Especially in recent years, scientific studies have found that it is associated with the concentration of boron in the silicon and oxygen. Everyone agreed that basically light or current injection can lead to boron and oxygen in silicon wafer form boron oxygen compounds, so as to shorten the minority carrier lifetime. After annealing treatment, however, the minority carrier lifetime can again. May's response: according to reports in the literature, silicon containing boron and oxygen after light minority carrier lifetime will have varying degrees of decline. Silicon chip boron and oxygen content is larger, under the condition of light or inject current silicon chip produced by boron - The more the number of oxygen compounds, the greater the reduce of minority carrier lifetime. However, in the mixed aerobic, particles and phosphorus silicon, minority carrier lifetime decreased with the illumination time very little. The solar cell performance early light attenuation occurs mainly on monocrystalline silicon solar cells. For polycrystalline silicon solar cells, and early photoinduced conversion efficiency of attenuation is very small. Thus, the nature of the silicon wafer determines the early light of the solar cell performance attenuation. As a result, photovoltaic modules of early light attenuation problem should be solved. We must start from solving the problem of silicon wafers. The following is the several solutions discussed.