Research Of Optical System In Spectral Response Measurements Of Multi-Junction Solar Cells

i iMulti-junction monolithic photovoltaic cells have been paid more attention for space technology applications because of the advantages of high photoelectric conversion efficiency, power-to-weight ratio, power area ratio etc. Space applications is the main development direction of the multi-junction solar cells in the future.The main technical parameters for multi-junction monolithic solar cells include Spectral Response, Short Current, Open Circuit Voltage and Photoelectric Conversion Efficiency. Among these parameters, Spectral Response has been paid more attention. Researchers have done a lot of work, formed a series of test standard, and establish a number of advanced photovoltaic laboratory. In the spectral response measurement of Multi-junction monolithic solar cells, correlation detection theory and practical detecting device have come forth abroad. China has researched in single junction solar cell with some success, while no breakthrough in Multi-junction monolithic solar cells, especially in the spectral response test. Relying on the import of foreign equipment will surely limit further theory exploration and experiment research. So the research of Multi-junction monolithic solar cells in theory method and test device is an important subject with good innovation.This thesis chooses the triple-junction solar cell GaInP/Ga(In)As/Ge as the research object. On the basis of analyzing, summarizing the optical response measurement system of traditional single-junction solar cell, we solve the problem of narrow spectrum (400-1100nm) of single-grating monochromator by using triple-gratings monochromator we designed ourselves. Aiming at special structure and characteristic of spectral response of multi-junction monolithic solar cells, we conduct light biasing system research and obtain appropriate biasing light source by using a set of light source, interference filter and adjustable- diaphragm. To solve the problem of weak radiant intensity at short wavelength, we adopt method of two light source, in the area of 350-500nm, we use xenon lamp as the light source of the triple-gratings monochromator, in other area, we use halogen-tungsten lamp. The use of fibers and fly's-eye lens simplify the light transmission. The software realize auto-control of triple-gratings monochromator, data acquisition, data processing and data analysis. Finally, test theory and key technology of the whole measurement system are completed on time, which lays the foundation for the final formation of one practical spectral response measurement system of multi-junction monolithic solar cell.