Papers for iPhone… soon

The Mac using scientists amongst you are probably aware of the Red in Greenprogram Papers for organising your electronic library of articles. The developer, Alex Griekspoor (aka mek), has been working hard on the corresponding iPhone version lately; now, it has been submitted to the App Store and is expected soon. Update 19.2.2009: available now. Not cheap with 10 Euros 8 Euros (Update 27.2.2009: sorry, my mistake, was 10 Dollars. And actually, it is rather cheap, considering what other things I buy for 8 Euros;-), and the iPhone seems also a bit small for reading papers, but might nevertheless be a useful tool. Also, it includes a free online backup via Amazon S3 (!) and syncing to the coming Papers (for Mac) version 1.9.

Personally, I like the Mac version of Papers a lot: it is really an innovative program, although for me it has never been very stable (this, however, seems not to be a common problem according to the forums. Still, apologies to mek for never mentioning my instabilities to him ;-).

Update 27.2.2009 P.S. After I posted this, I wrote the Papers developer, mek, about my instability problem, and he answered within a few hours. It is a known issue having to do with Smart Lists. Now, my Papers version is responsive and stable!

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“The first thing we have to do is just not screw it up…”

Panel discussion at the American Association for the Advancement of Science meeting Solar Panels in Lower Franconiaabout where research efforts (and funding;-) should be focused concerning energy production and use. Nanotechnology might play a key role – to which organics belong, even though they are not explicitly mentioned. The discussion is summarised at Ars Technica. One conclusion:

So from the generation side, there were several key messages about where we should be putting our money: go with solar, increase efficiencies using nanoparticles, find a way to use cheap and abundant raw materials, and think seriously about thermoelectric materials.

The German physical society published a study about climate, energy, and what related research is needed back in 2005, yet still contains uptodate concepts and ideas. But I still wonder: Do Europeans actually have an organisation similar to the AAAS mentioned above, or similar meetings?

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New blog on organic and hybrid photovoltaics

Today I found a new blog Hallburg in November(only a few days old) on hybrid and organic photovoltaics by Juan Bisquert, Professor for Applied Physics in Castelló de la Plana, Spain. I know him as author of interesting papers, a recent one being the review-like article on a rather fundamental view on diffusion and its different interpretations in disordered materials [Bisquert 2008]. Also, allow me the unrelated remark (personal interest, so to say;) that his university seems to be just within a wine region, similar to my home of choice.

As fellow blogger with common interest:


I am looking forward to reading your posts.


Update 20.2.2009: At the same time, another new blog from the same university started; same topic, different style.

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Mobility and Efficiency of Polymer Solar Cells

Joshua TreeDisordered organic materials inhibit charge carrier mobilities which are orders of magnitude lower than for inorganic crystals. First thing missing in disordered matter is the regularly ordered lattice of atoms, where the charge carriers can delocalise, leading to band transport. Second thing is the generally lower interaction between adjacent molecules, which is due to weaker bonding and larger distances. The transfer integral, the value of which goes exponentially down with distance, to get from one to the other molecule is too low for delocalisation. Thus, in terms of charge carrier mobility, think 10-2cm2/Vs for disordered organics (if you are lucky) vs. at least 102cm2/Vs for ordered inorganics.

How much does a weak charge transport limit the performance of organic solar cells? How bad is it?

Continue reading “Mobility and Efficiency of Polymer Solar Cells”

Industry Again…

Plextronics just opened its first manufacturing development line for organic ink (in contrast to the inorganic ink news from last week) to be used in polymer solar cells. Boston SkylineA stage prior to production, this is still good news for the organic photovoltaics community. The spin-off from Carnegie Mellon University, founded in 2002, describes its focus as being

on organic solar cell and organic light emitting diodes (OLED), specifically the conductive inks and process technologies that enable those and other similar applications.

I mentioned Plextronics already last year, as they presented the (up to now, I believe) highest certified power conversion efficiency for an organic solar cell.

Indeed, industry news again… for next time, I promise more fundamentals;-)

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Inkjet Printing of Inorganic Solar Cells

Last week, the german company Roth and Rau – supplier of plasma process systems for the photovoltaics industry – had Newbury Street, Bostona press release: they just finished the installation of a new production line for inkjet printing of silicon solar panels, together with Innovalight. See here (or in german here). Innovalight has developed the silicon ink technology in recent year, in collaboration with NREL and others. Low level of details, as typical for press realeases, but certainly interesting. And a competitor for printed organic solar cells even before they are in the production stage, even if on track.

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Personal news, and a happy new year 2009

Dear valued reader, Anette Hammer)' on Flickr.complease allow me to share some personal news:

Just married !

On the 20th of December 2008, Anja and I celebrated our civil wedding, our “way into happiness” as we call it, in my home town Wuppertal! Afterwards we spent two very relaxing weeks on vacation, enjoying togetherness, thus regaining vigour and inspiration after a laborious year.

That news given, you will certainly believe me that for us this will be an excellent new year 2009, with many more as good ones to follow. Please accept my best wishes for a healthy, funny, splendid year to come.

All the best,


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