National Renewable Energy Laboratory (NREL) Director Dan Arvizu recently gave a keynote speech during the 2013 International Renewable Energy Conference (part of Abu Dhabi Sustainability Week), which I was lucky enough to attend*. His speech covered a large variety of cleantech topics, and most of the points he made have been covered extensively here on CleanTechnica. However, a couple of his points stood out to me as rather interesting and relatively uncovered.
Some of them are the foci of the interviews I conducted with him after his presentation (see the posts linked on the bottom of this article). But I decided to leave a couple of the points out of our interviews since they’re pretty straightforward and the chart presenting them is available on the NREL website, and now right here:
The takeaway points from the chart are:
The current efficiencies of all types of solar modules and solar cells are nowhere near their theoretical efficiency limits. (And that’s not to say the theoretical limits can’t also increase.)
Thin-film solar (CdTe) is especially ripe for efficiency improvements (commentary on that below), as are concentrated photovoltaics (CPV).
The general benefit of thin-film solar is that it’s cheaper than conventional PV. Its downside is that it’s less efficient, but as you can see in the chart above, its theoretical efficiency limit is equal to or better than every other type of solar besides CPV (which is very efficient but still quite expensive).
Of course, there are thin-film solar companies other than First Solar that are vying to take a bigger portion of the market (such as Japan’s Solar Frontier), and they are trying to develop better thin-film solar technology in order to do so. And improvements to thin-film solar cell efficiency are being made regularly in labs and universities around the world. So, overall, it seems that we can expect that gap between real-world efficiency and theoretical efficiency to keep closing.
I guess the question this leaves us with is which technology or technologies will improve their real-world efficiencies using low-cost materials quickly enough to dominate the solar power market in the coming decades?
Ritesh Pothan, is an accomplished speaker and visionary in the Solar Energy space in India. Ritesh is from an Engineering Background with a Master’s Degree in Technology and had spent more than a decade as the Infrastructure Head for a public limited company with the last 9 years dedicated to Solar and Renewable Energy.
He also runs the 2 largest India focused renewable energy groups on LinkedIn - Solar - India and Renewables - India