http://blog.disorderedmatter.eu/2008/03/11/optimisation-routes-for-organic-solar-cells-absorption/ Addressing confusion about physics of disordered materials, and adding to it... ;-) Sat, 28 Jan 2012 20:59:59 +0000 hourly 1 http://wordpress.com/ http://blog.disorderedmatter.eu/2008/03/11/optimisation-routes-for-organic-solar-cells-absorption/#comment-72 Wed, 03 Jun 2009 01:23:53 +0000 http://deibel.wordpress.com/?p=40#comment-72 For me another big trade-off is wanting a lower bandgap material to increase light absorption while still having a material which self organises into a (semi) crystalline state which obviously helps with charge transport. For me, a donor-acceptor type polymer will give you a lower bandgap (e.g. < 1 eV) but I doubt if such a polymer will ever be strongly crystalline. On the other hand I think I read somewhere that a more homogeneous polymer which could have strong crystallising ability will never have a band-gap below 1.5 eV. I forget the reference but I have it somewhere on my desk. For me again the choice between the two is clear. Charge transport at this time is much more critical than light absorption and so we need to develop a homopolymer with a bandgap as close to 1.5 eV as possible (and of course has good charge transport).

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