小量子点使太阳能电池板更高效
文章来源:未知 文章作者:enread 发布时间:2011-03-28 03:22 字体: [ ]  进入论坛
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Studies done by Mark Lusk and colleagues at the Colorado School of Mines could significantly improve the efficiency of solar cells. Their latest work describes how the size of light-absorbing particles--quantum dots--affects the particles' ability to transfer energy to electrons to generate electricity. The results are published in the April issue of the journal ACS Nano.

The advance provides evidence to support a controversial idea, called multiple-exciton generation (MEG), which theorizes that it is possible for an electron that has absorbed light energy, called an exciton, to transfer that energy to more than one electron, resulting in more electricity from the same amount of absorbed light.

Quantum dots are man-made atoms that confine electrons to a small space. They have atomic-like behavior that results in unusual electronic properties on a nanoscale. These unique properties may be particularly valuable in tailoring(剪裁) the way light interacts with matter.

Experimental verification of the link between MEG and quantum dot size is a hot topic due to a large degree of variation in previously1 published studies. The ability to generate an electrical current following MEG is now receiving a great deal of attention because this will be a necessary component2 of any commercial realization3 of MEG.

For this study, Lusk and collaborators used a National Science Foundation (NSF)-supported high performance computer cluster to quantify the relationship between the rate of MEG and quantum dot size.

They found that each dot has a slice of the solar spectrum4 for which it is best suited to perform MEG and that smaller dots carry out MEG for their slice more efficiently5 than larger dots. This implies that solar cells made of quantum dots specifically tuned6 to the solar spectrum would be much more efficient than solar cells made of material that is not fabricated with quantum dots.

According to Lusk, "We can now design nanostructured materials that generate more than one exciton(激子) from a single photon of light, putting to good use a large portion of the energy that would otherwise just heat up a solar cell."

The research team, which includes participation7 from the National Renewable Energy Laboratory, is part of the NSF-funded Renewable Energy Materials Research Science and Engineering Center at the Colorado School of Mines in Golden, Colo. The center focuses on materials and innovations that will significantly impact renewable energy technologies. Harnessing the unique properties of nanostructured materials to enhance the performance of solar panels is an area of particular interest to the center.

"These results are exciting because they go far towards resolving a long-standing debate within the field," said Mary Galvin, a program director for the Division of Materials Research at NSF. "Equally important, they will contribute to establishment of new design techniques that can be used to make more efficient solar cells."



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1 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
2 component epSzv     
n.组成部分,成分,元件;adj.组成的,合成的
参考例句:
  • Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
3 realization nTwxS     
n.实现;认识到,深刻了解
参考例句:
  • We shall gladly lend every effort in our power toward its realization.我们将乐意为它的实现而竭尽全力。
  • He came to the realization that he would never make a good teacher.他逐渐认识到自己永远不会成为好老师。
4 spectrum Trhy6     
n.谱,光谱,频谱;范围,幅度,系列
参考例句:
  • This is a kind of atomic spectrum.这是一种原子光谱。
  • We have known much of the constitution of the solar spectrum.关于太阳光谱的构成,我们已了解不少。
5 efficiently ZuTzXQ     
adv.高效率地,有能力地
参考例句:
  • The worker oils the machine to operate it more efficiently.工人给机器上油以使机器运转更有效。
  • Local authorities have to learn to allocate resources efficiently.地方政府必须学会有效地分配资源。
6 tuned b40b43fd5af2db4fbfeb4e83856e4876     
adj.调谐的,已调谐的v.调音( tune的过去式和过去分词 );调整;(给收音机、电视等)调谐;使协调
参考例句:
  • The resort is tuned in to the tastes of young and old alike. 这个度假胜地适合各种口味,老少皆宜。
  • The instruments should be tuned up before each performance. 每次演出开始前都应将乐器调好音。 来自《简明英汉词典》
7 participation KS9zu     
n.参与,参加,分享
参考例句:
  • Some of the magic tricks called for audience participation.有些魔术要求有观众的参与。
  • The scheme aims to encourage increased participation in sporting activities.这个方案旨在鼓励大众更多地参与体育活动。
TAG标签: energy cells solar
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