Indoor Measurement And Parameter Analysis For GaAs Multijunction Solar Cell

With the development of photovoltaic technology at home and abroad, more and more research institutions and enterprises have joined the field of photovoltaic, especially in terrestrial photovoltaic applications, gradually extended from space military field to ground civil field. In the near future, there will emerge large numbers of solar cells, the output characteristic and quality evaluation is particularly important then. Solar cell's indoor output characteristics have direct impact on its outdoor performance. Therefore, the solar cell quality evaluation indoor becomes extremely important. Under the simulated light source, all the important parameters, including efficiency, of solar cells can be directly measured, which are key indicators to a solar cell.Based on the measurement of GaAs solar cell in both with and without light condition, its current-voltage curves have been analyzed, and several important parameters have been extracted from the curves. From dark IV test, the failure parts caused by packaging technology or man-made can be removed during production; from light IV test, the defective products, which can not be detected in the dark IV test, can be found out, such as chip's epitaxial growth defects. Light IV test can calibrate the solar cell too.Build an indoor test system with a sun simulator, analysised the solar cell's IV curve and PV curve under standard conditions, gained several important parameters resembling the solar cell's performance. Many test data showed, the conversion efficiency of a GaAs solar cell is about 30%-32% under AM1.5 standard condition. By adjusting the solar simulator's light intensity, simulated measured the output character under high concentration, studied the parameters dependence on the light intensity and work temperature, and provided theory reference to the outdoor test.