What are factors that influence efficiency of pv components and systems?

Light attenuation also called S - W effect. a - Si: H film is approved by the glare or current of a long time, in the current defects and make the film performance degradation, called StaEbler - Wronski effect ( D。 l Staebler and C. R。 Wronski early detection. Personally think pv group

the attenuation induced by light, also known as shear effect. Amorphous silicon thin film under a strong light or current in a long period of time after irradiation, the internal defects, reduce the performance of the film. This is known as le Tiber Eph lonski effect. I personally think that photovoltaic component is actually the performance of silicon decay. First of all, silicon chips will experience slow chemical reaction, in the long-term aerobic environment by oxidation, reducing performance. This is a major cause of long-term attenuation module. In the process of vacuum molding, boron ( The cavity) And p ( Donor) To a certain proportion to doping, in order to improve the silicon wafer carrier mobility, thus improve the performance of the module. However, as a lack of boron atom, and oxygen atoms ( Donor) Reaction, reduce the carrier mobility, and thus reduce the performance of the module. This is the module of the main causes of attenuation of about 2% a year. Component attenuation is divided into: 1. Components of power suddenly attenuation due to destructive factors, mainly is refers to the element in the process of welding welding bad, lack of glue in the process of encapsulation, or element in the process of handling and installation of improper operation, even in the process of the components used components caused by the hail the onslaught of internal crack and the phenomenon of the serious breakage the cell. 2. Module of the initial light attenuation, namely the output power of pv modules in the use of a significant reduction in the first few days, but then the stable, usually less than 2%; 3. Component aging and decay, that is, use for a long time when the power down very slowly, in the attenuation of 0. Attenuation is less than 20% 8%, 25 years; Japan and Germany two photovoltaic companies components of 25 years guarantee efficiency has to be confirmed. 2012 years later, the domestic photovoltaic modules of basic requirements, the production of photovoltaic modules basic equipment and materials imported from west Germany. The key factors influencing the photovoltaic power station power generation is the efficiency of system. In system efficiency considering the main factors are: dust, rain shield, temperature and components of mismatch, inverter, DC/ac series cable, transformer and precision tracking system.