英语听力文摘 English Digest 601、树叶与太阳能板

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　　What do leaves and solar panels have in common?

 

　　Both absorb sunlight and turn it into energy. But while solar panels typically have smooth surfaces, leaves have tiny wrinkles and folds that allow for maximum light absorption.

 

　　Recently, scientists took a cue from nature and engineered plastic solar panels with leaf like surfaces. Most flat surfaced solar panels absorb some light and turn about eighteen percent of it into electricity. Panels with ridged surfaces can absorb more light by channeling light waves, thereby¹ significantly increasing their efficiency at converting light into electricity.

　　Besides making panels more efficient, ridged and wrinkled surfaces could allow solar panels to be made out of bendable plastic instead of silicon². Silicon is naturally better at absorbing light than plastic, but it’s also more expensive and more brittle³. Flexible plastic is cheaper and more durable⁴ but typically not as good at absorbing light. But with leaf like surfaces, solar panels made from bendable plastic may be able to absorb light just as effectively, if not more so, than regular panels.

 

　　Another benefit of the wrinkled surface technique is that it’s especially useful for increasing absorption at the red end of the light spectrum⁵, which has the longest wavelengths⁶. Conventional solar panels typically absorb very little of red and infrared⁷ light. But the folding technique increased absorption of this light by nearly 600 percent.

 

　　Plastic, leaf like solar panels are not yet ready for widespread use. But they could one day help revolutionize the solar industry by allowing for thin, flexible panels used on windows, clothing, and most flat surfaces.

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