The University of Texas at Austin
  • The future of "solar ink": Q&A with Brian Korgel

    By Marjorie Smith
    Published: Jan. 12, 2010
    The

    Dr. Brian Korgel is the Temple Professor No. 1 and Matthew Van Winkle Regents Professor in Chemical Engineering in the Cockrell School of Engineering.

    Your research focuses on low-cost nanoparticle solar cells. What makes this research unique?
    We’re trying to develop a radically new approach to making solar cells by developing materials that can be painted or printed onto surfaces, like ink on newspaper. Right now, solar cells are made using relatively expensive materials deposition processes requiring very high temperatures and high vacuum. This makes it difficult to manufacture solar cells on very large area substrates, and the current processes are relatively slow. The need for high temperatures also limits the kinds of supports for the devices that can be used. For example, photovoltaic devices can’t be made on plastic substrates using the current approaches. The nanoparticle inks that we are making could ultimately be printed onto nearly any substrate, using low-cost roll-to-roll processes — manufacturing a solar cell would be like printing a newspaper.

    In a past article you said solar cell efficiencies need to be about 10 percent. Can you explain why?
    For commercial viability, a solar cell needs to be able to convert about 10 percent of the energy in the sunlight. (This is called the power conversion efficiency.) Devices that convert much less than this don’t supply enough power to be useful. In August we had reached 1 percent. We’ve now reached just a little more than 2 percent.

    What products or applications could be created using solar cell ink?
    Windows is an interesting application where the solar cell would need to be semi-transparent and still work like a solar cell. The inks could possibly enable that. But more generally, the inks have the potential to dramatically lower the cost of solar cell manufacturing. The general target is to lower the manufacturing costs of solar cells by a factor of 10. The inks have the potential to do that.

    Is the prospect of being able to paint solar cell inks onto a rooftop or building likely?
    There is no fundamental road block to being able to paint a solar cell. The solar cell itself consists of a few different layers of materials, and we’ve been focusing on the most important layer, which is the light-absorbing layer. But if one were to paint a complete solar cell, each material would require an ink. It should be possible to do this. Then, ultimately, the solar cell would need to function efficiently, which is the engineering challenge that we working on right now.

    How great is the potential for commercialization of solar cell inks?
    The potential is huge. If the cost of a solar cell could be reduced by a factor of 10, then you’d see widespread adoption of the technology because it would begin to become competitive with fossil fuels. That’s the ultimate goal — grid parity — reaching the point when solar energy would cost the same as fossil fuels.

    How does solar cell ink advance eco-friendly practices?
    It would largely eliminate the need for the energy intensive processes required for solar cell manufacture. Also, the processing of silicon creates significant chemical waste, which could largely be avoided by our approach.

    In 2002, you co-founded a company called Innovalight, which produces inks using silicon. Do you see many parallels in your solar cell research and the years leading up to Innovalight?
    There are some parallels. However, Innovalight was founded based on a particular material (silicon nanocrystals) that we were making in my laboratory, which had a variety of unique properties — Innovalight sought to exploit that particular material and commercialize it. My laboratory’s research on “solar inks” is not limited to any particular material. We’re trying to find a solution to a very tough problem — how to convert sunlight into usable electrical power at a cost that is competitive with fossil fuels.

    • Quote 2
      RODNEY CLINCH said on Feb. 29, 2012 at 5:42 p.m.
      If i can ask the question when do see a product for install or manufacture for the everyday home owner. by the way your info has reached the best part of the world _western australia , this is where we get at least 10 -12 hours of sunlight per day over summer time , a good 8 hours in winter. look forward to your advancement on the ink idea.discovered this via readers digest .
    • Quote 2
      Dan Betancourt said on Oct. 12, 2011 at 7:40 p.m.
      For a Long time I was thinking off that, I will be glad to participate, for example a instal a flexible pannel attached on the roof on mi Van, but I was thinking that good not lock nice and making a Paste of Silicon like the semiconductores and plakes that offers a good conversion, An a earlyer time a was looking for a Dielectric that converts not only the sun light and the heat, some like, let me know if, i contribute with some...
    • Quote 2
      Lyndsey Iuchs said on June 17, 2011 at 8:11 p.m.
      Someone essentially help to make seriously articles I would state. This is the very first time I frequented your website page and thus far? I amazed with the research you made to create this specific publish amazing. Excellent job!
    • Quote 2
      Webdesign Glasgow said on May 4, 2011 at 10:54 a.m.
      Is it acceptable if I quickly state that we are looking to find more graphic design?
    • Quote 2
      Resorna said on Feb. 11, 2011 at 6:51 a.m.
      kinda like what you published . it just is not that easy to discover great posts to read (you know.. really READ and not simply browsing through it like a zombie before going to yet another post to just ignore), so cheers man for not wasting my time on the god forsaken internet. :D
    • Quote 2
      security tool virus removal said on Jan. 9, 2011 at 9:21 p.m.
      Liked your posting a lot. I’ll be browsing your site regularly. I discovered it on google
    • Quote 2
      change my life said on Dec. 23, 2010 at 10:57 p.m.
      Another great innovation. I hope for the success of this project. This will help not only in the development of technology but also in the conservation of our environment.
    • Quote 2
      Preston said on May 12, 2010 at 11:58 a.m.
      Have you guys thought about opening a few old ideas to the light of a new day? Sure, once you get this cell painting under way you'll be able to compete with all of the gases, not just fossil fuels, but how would you like to blow them out of the water? You have an army of scientists, banks of supercomputers, and so I'll ask you why has nobody thought to complete Nicola Tesla's Wardenclyffe Tower?
    • Quote 2
      EVA CARABALLO said on April 18, 2010 at 11:52 a.m.
      PLEASE EMAIL REPLY. I LIVE IN ARIZONA AND WOULD LOVE TO BE THE TEST SIGHT ON HOW YOUR SOLAR INK PANELS WORK IN EXTREME HEAT. I AM LOOKING TO BE PART OF SOMETHING REALLY WORTHWHILE AND PRODUCTIVE IN ENERGY EFFICIENCY. EVA
    • Quote 2
      Greenhoof » Blog Archive » Nano-Particle Solar Cell Ink said on Jan. 19, 2010 at 9:02 p.m.
      [...] Via Univ of Texas at Austin : Solar ink [...]
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