Hot Spots

  • Author: University of Texas/ChemViews
  • Published: 19 June 2010
  • Source / Publisher: University of Texas/Science
thumbnail image: Hot Spots

The current standard of efficiency in solar cells is about 31%. Much of the energy from sunlight is lost as heat because photons with energies above the semiconductor bandgap generate hot charge carriers that cool before they can be utilized.

Two methods of capturing this energy need to be employed for improved efficiency:

  • the rate of cooling of hot carriers needs to be slowed down, and
  • hot carriers need to be captured before all their energy is lost.

Work by Xiaoyang Zhu, University of Texas at Austin, USA, and co-workers at the University of Minnesota, USA, brings researchers one step closer to solving the second problem.

They discovered that hot-electron transfer from colloidal PbSe nanocrystals to a TiO2 electron acceptor was possible and proceeded rapidly when the surfaces were chemically treated.

Says Zhu: "Our next goal is to adjust the chemistry at the interface to the conducting wire so that we can minimize this additional energy loss.”

Article Views: 2587

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permisson guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH