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考研英语阅读篇章: 太阳能利用获新提升

2014-07-09 19:04:12来源：新东方在线编辑整理

 新东方在线小编为大家整理考研英语阅读系列篇章精选，通过双语阅读的方式，帮助同学们捕捉国内外新闻以及最前沿的奇人异事。考生可作为备考资料，阅读的同时将不熟的单词牢记。

考研英语阅读篇章：太阳能利用获新提升

　　A perspective article published last month by University of California, Riverside chemists in the Journal of Physical Chemistry Letters was selected as an Editors Choice -- an honor only a handful of research papers receive. The perspective reviews the chemists' work on "singlet fission," a process in which a single photon(光子) generates a pair of excited states. This 1->2 conversion process, as it is known, has the potential to boost solar cell efficiency by as much as 30 percent. Applications of the research include more energy-efficient lighting and photodetectors with 200 percent efficiency that can be used for night vision. Biology may use singlet fission to deal with high-energy solar photons without generating excess heat, as a protective mechanism.

　　Currently, solar cells work by absorbing a photon, which generates an exciton(激子), which subsequently separates into an electron-hole pair. It is these electrons that become solar electricity. The efficiency of these solar cells is limited to about 32 percent, however, by what is called the "Shockley-Queisser Limit." Future solar cells, also known as "Third Generation" solar cells, will have to surpass this limit while remaining inexpensive, requiring the use of new physical processes. Singlet fission is an example of such a process.

　　"Our research got its launch about ten years ago when we started thinking about solar energy and what new types of photophysics this might require," said Christopher Bardeen, a professor of chemistry, whose lab led the research. "Global warming concerns and energy security have made solar energy conversion an important subject from society's point-of-view. More efficient solar cells would lead to wider use of this clean energy source."

以上是考研英语阅读篇章双语新闻系列分享，同学们在复习过程中找不到适合自己的方法可参考参考【2015暑期备考】专题，或选择>>点击查看资料下载中心。

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