Researchers are applying the design to semiconductor materials to make solar cells that they hope will save money on materials costs while still offering high power-conversion efficiency.

研究者正把这项设计应用到制造太阳能电池的半导体材料上，这样他们希望在节省材料成本的同时仍可以提供高效率的能量转换。

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Sandwiching the solar cells inside the device would block some light out and knock down power conversion efficiency even further, Filler cautioned.

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With this combination, 4% power-conversion efficiency for solution-processed and visibly transparent polymer solar cells has been achieved.

ENGADGET: UCLA creates transparent solar cell, dreams of current generating windows

If, on the one hand, you've got biofuels which represent only a half a percent conversion of sunlight, and let's say you've got photovoltaic cells and concentrated solar power systems, the efficiency of solar in terms of pure conversion is 50-100 times greater.

CNN: Biofuels: What do the experts think?