A reason for optimism - improvements in solar cells

Back in the day, I did some work in the area of dye-sensitised solar cells, and more recently on organic solar cells. So I like to keep an eye on how things are going. Since now and then I hear negative comments about renewable energy - "we're never going to get X% of our energy from it" - I thought I'd post this graph here as it shows that real progress continues to be made and we should be a bit more optimistic (click image for original):

This graph, "courtesy of the National Renewable Energy Laboratory, Golden, CO", contains efficiency measurements of test solar cells as measured in a standardised test by an independent test lab (e.g. the NREL in the US). Of course, there is quite a distance between an efficient test solar cell (a couple of square cm in size) and a viable product for the market, but improving efficiency is important (lifetime, processability and cost are other considerations).

It should also be noted that it may not make much sense to compare efficiencies of different cell types as the price/efficiency ratio may be much different (e.g. semiconductor-grade silicon crystals are more expensive than an organic polymer). Also, efficiency isn't even the full story, e.g. silicon solar cells are top of the pile, but if we all switched to this technology tomorrow, there would likely be a net increase in electricity usage (i.e. when you consider the energy cost of making them). Similarly any technology that relies on rare elements is not going to save the world (but may make a lot of money for some mobile phone makers).

Anyhoo, I like to look at this graph every so often to remind myself that things are improving, and that in the long run, we're going to make it. Or at least as far as efficient solar cells can take us.

For more info on the graph, check out the NREL's photovoltaic page.

See you at EuroSciPyDataCon?

I've been checking up the various Python conferences this year. Using www.pycon.org as a starting point, I see that for me (based in Cambridge, UK) the possibilities include:

• PyData Berlin: Berlin (surprise!) May 2015
• EuroPython: Bilbao July 2015
• EuroSciPy: Cambridge August 2015
• PyCon UK: Coventry Sept 2015

Some of these are already open for talks or registration, so check 'em out soon if interested.

While it would be nice to swan around Bilbao and Berlin, I'll probably aim to attend or speak at EuroSciPy which will be in my backyard. I'm kind of reluctant to speak though; I've never been to a conference that wasn't a straight-up scientific meeting so I'm not quite sure what the audience would expect. Who's interested in chemistry and Python that's not already using chemistry and Python? So I'm not quite sure about that.

Leave a comment if you're going to be there too!