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Conversion Efficiency of Solar Cell with Ion-Implanted Rare Earth into Anti-Reflection Film

离子注入稀土增透膜太阳能电池的转换效率

基本信息

批准号：
10555089
负责人：
KAWANO Katsuyasu
金额：
$ 3.46万
依托单位：
The University of Electro-Comunications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

On studies of solar cell efficiency improvements performed so far, almost all researches have aimed to modify the structures of solar cell itself for fitting the spectroscopic sensitivity to the sunlight spectrum that is absolutely unchangeable. A reversed concenption, however, is there that the sunlight spectrum is modified to be fitted to solar cell sensitivity by applying wavelength shifting operation of rare earth ions. By applying wavelength shifting operation of rare earth ions as photovoltaic precursors, the higher energy region of sunlight can be shifted to a longer wavelength, in which the cells can produde electric power with high efficiency. The most effective rare earth Eu^<2+> ions were doped by the ion implantation techniques into the anti-reflection (AR) film that is usually coated on the surface of a solar cell. Two kinds of commercial a-Si and p-Si solar cells with SiO_2 AR films which the ion-implantation doses were 10^<11>-10^<12> /cm^2 were implanted under the ion beam energy of 180 keV.The relative conversion efficiencies, the ratios of after- to before-implanted, were found to be 1.55 to 1.58. For p-Si cell, on the other hand, lower relative efficiency may be owing to less reachings of emission to the spectroscopic sensitivity region than the case of a-Si one. Also some assisting mechanisms for sunlight concentrations such as lenses, prisms and texture systems may be required.

迄今为止对太阳能电池效率改进的研究，几乎都是针对太阳能电池本身的结构进行改进，使其对绝对不变的太阳光谱的光谱灵敏度达到合适的程度。然而，有一种相反的观点认为，通过应用稀土离子的波长移动操作，可以修改太阳光光谱以适应太阳能电池的灵敏度。利用稀土离子作为光伏前驱体进行移波长操作，可以将太阳光的高能量区域转移到更长的波长，从而使电池能够高效率地产生电能。通过离子注入技术将最有效的稀土Eu^<2+ b>离子注入到通常涂覆在太阳能电池表面的增透膜中。在180 keV的离子束能量下，用SiO_2 AR膜注入剂量为10^<11> /cm^2 ~ 10^<12> /cm^2的a-Si和p-Si两种商用太阳能电池。相对转化效率，即植入后与植入前的比值为1.55比1.58。另一方面，对于p-Si电池，较低的相对效率可能是由于发射到光谱敏感区域的距离比a-Si电池少。此外，可能还需要一些辅助机制，如透镜、棱镜和纹理系统。