Relationship between electroluminescence images and power type parameters of defective silicon solar cells

Based on Electroluminescence (EL) theory, the solar cell detection system were built by the particular wavelength near-infrared CCD imaging device, which mainly included the camera obscura, computer imaging analysis software and constant current source, finally completed the near-infrared image detection of solar cells in a dark room. A number of the same batch of solar cells were divided into normal or recessive defective cells through EL detection, then we could get the appropriate cells of the open circuit voltage, short-circuit current, power and other parameters by standard solar power tester for power test. Finally we could get that the defects would affect the power type parameters of the solar cell, meanwhile EL technology is proved to be an accurate measurement to detect solar cells. It could provide a broad idea for further design of the power test equipment.