液浸聚光光伏中二甲基硅油的耐候性研究

STDUY THE WEATHER-RESISTANCE OF DIMETHYLPOLYSILOXANE USED IN LIQUID-IMMERSING CPV RECEIVERS

通过高温、紫外以及高温紫外耦合加速实验考察了二甲基硅油的适用性。利用紫外可见光谱仪、红外光谱仪检测实验前后硅油性质的变化,并测试和分析硅光电池液浸前后的电性能和表面形貌。结果显示:实验后二甲基硅油的光谱透过率在低波段稍有降低,微观分子结构没有改变;光伏电池的电性能没有衰降,但是表面析出了微量颗粒状物质。最后对液体透光率的变化给出了理论分析。

Due to the need of efficient cooling in CPV system,dimethylpolysiloxane was used for cooling solar cells by direct immersing the cells in it.High temperature tests（85℃ and 150℃）,UV-light test and high temperature and UV coupling test were designed for testing the weather-resistance of dimethylpolysiloxane.After tests,UV-vis spectrometer and Fourier transfer infrared spectrometer were used to measuring the changes of dimethylpolysiloxane,also the Voc,Isc,and the surface of the immersing cells were measured before and after tests.The results indicated that the transmittance had a little drop in the low wavelength,the molecular structure did not changed; there were no electrical degradation in immersed silicon solar cells,while minim substance of varied shape and size appeared on the surface of cells.At last,the reason of transmittance＇s degrade was analyzed.