But solar energy photovoltaic power cost is high and its conversion efficiency is low.

但太阳能光伏发电存在成本较高和能量转化效率较低的问题。

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Some factors effects on energy conversion efficiency have been analyzed, which give some support for the next application and development of solar chimney.

对影响整个太阳能热转换效率的几个因素进行了研究分析，为下一步太阳能烟囱技术的进一步推广应用打下基础。

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A volume phase and off-axis holographic Fresnel lenses was developed for matching the corresponding solar cells with different band gaps. The conversion efficiency of energy increased by two times.

用激光制作了离轴体积位相全息菲涅耳透镜，并把它们和相应的具有不同能带隙的太阳电池匹配，其能量转换效率提高了两倍。

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