液浸对聚光硅太阳电池电性能的影响

EFFECT OF DIELECTRIC LIQUIDS IMMERSION ON ELECTRICAL CHARACTERISTICS OF SILICON CONCENTRATOR SOLAR CELL

利用恒压闪光式电池测试仪测试分析不同厚度的去离子水、异丙醇和二甲基硅油对聚光硅太阳电池在10—30倍聚光比下电性能的影响。研究发现，薄液膜浸没时电池的转换效率最大可提高15．2％，这是因为薄液膜一方面可减少电池表面的反射光，另一方面液体分子的吸附可降低电池表面复合速率；随液膜厚度的增加，液膜对光的吸收增强，电池转换效率的提高幅度开始降低；液浸电池在较高聚光比下电性能有更大提高。

The electrical characteristics of silicon concentrator solar cells were examined under 10X-30X concen- tration through constant voltage I-V flash tester, which are in both the absence of the candidate immersion liquids and also within different liquid thickness on top. The candidate immersion liquids include de-ionized water, isopropyl alcohol and dimethyl silicon oil. The results showed that improvements to the electrical performance of silicon concentrator solar cells are observed as the liquid film presence and the biggest percentage change is 15.2%, arising from reduction in reflection and reduced cell surface recombination losses from surface adsorption of polar molecules. With increase in the liquid thickness, the extent of the improvement to the efficiencies of the cells operated in liquids decreases. This is because more light is absorbed by the liquid when cells operated in thicker candidate liquids. Furthermore, more power output from the cells operated in liquids is achieved under higher concentration ratio.