Light induced attenuation (LID) refers to the phenomenon where the output power of solar cells or photovoltaic modules tends to stabilize after a significant decrease in the initial use. Abbreviation for Photovoltaic Photoinduced Attenuation Test ChamberLight attenuation test chamber.
According to research results, the main reason for this phenomenon is that P-type boron doped silicon wafers produce boron oxygen and boron iron complexes under illumination, which reduces the lifetime of their minority carriers and leads to a decrease in the power of solar cells. Due to the variability of initial photoinduced attenuation in solar cells, solar cells with the same electrical performance within the same photovoltaic module may experience significant differences in electrical performance after photoinduced attenuation, leading to abnormal output curves and hot spot phenomena, and even early failure of the photovoltaic module. Therefore, conducting initial photoinduced attenuation testing on solar cells before packaging them into photovoltaic modules, and pre attenuating solar cells with larger attenuation amplitudes, is one of the important measures to ensure product performance and quality and avoid customer losses.
Below, the editor will briefly introduce the basic structure of the optical attenuation test box system, as shown below:
1. A double-layer high-temperature resistant high tensile sealing strip is used between the door and the box to ensure the sealing of the testing area.
2. The outer shell is made of high-quality (t=1mm) A3 steel plate, processed and formed by CNC machine tools, and the surface of the shell is sprayed with plastic for a smoother and more beautiful appearance.
3. Using non reactive door handles makes operation easier.
4. Adopting a long axis fan motor and a stainless steel multi blade impeller that is resistant to high and low temperatures, to achieve strong convection and vertical diffusion circulation.
5. The inner liner is made of imported (t=1mm) SUS304 high-quality mirror stainless steel plate.
6. The bottom of the machine adopts high-quality fixed PU movable wheels.