Cheaper Solar Power? New Breakthrough Hits 44.7% Conversion

By | September 26, 2013

44percentsolarA research team in Europe has achieved a world record-setting solar conversion efficiency of 44.7 percent, and assuming that higher efficiency translates into lower costs, it’s yet another indicator that we’re only at the beginning of a long, steep decline in the cost of solar power.

Solar (and wind, for that matter) is already competitive with or cheaper than coal in US markets, and with solar cell efficiency edging this close to the 50 percent efficiency mark, we’re expecting to see those trend lines grow farther and faster in the near future.

44.7% Solar Conversion Efficiency Record

With our usual caveat that there are a number of different solar technologies out there and different ways of measuring conversion efficiency, let’s look at the new record-setting claim. …

The research partnership consists of the Fraunhofer Institute for Solar Energy Systems ISE, top cutting edge semiconductor manufacturer Soitec, the French R&D organization CEA-Leti, and the Helmholtz Center Berlin.

The basic technology is a multi-junction solar cell, meaning a cell made up of layers of different semiconductor materials in order to capture the widest possible range of the solar spectrum. Multi-junction cells are typically used in concentrator solar systems.

The group of materials used in this particular cell is the III-V group, which refers to their position on the Periodic Table.

The new record is a significant notch up from the team’s previous achievement of 43.6 percent, set just a few months ago. It looks like Soitec made a key contribution in the form of a new bonding process. Fraunhofer ISE Department Head Frank Dimroth explains:

This four-junction solar cell contains our collected expertise in this area over many years. Besides improved materials and optimization of the structure, a new procedure called wafer bonding plays a central role. With this technology, we are able to connect two semiconductor crystals, which otherwise cannot be grown on top of each other with high crystal quality.

The Fraunhofer team better not relax on their laurels, though. They leapfrogged over Sharp, which announced a triple junction cell with 44.4 percent efficiency in the summer, but that doesn’t leave them much breathing room.

Let’s also note for the record that the National Renewable Energy Laboratory (NREL) has been working with the company Amonix to develop a standard for measuring real-world conversion efficiency over a period of time for installed concentrator solar cell systems. Under those calculations, Amonix staked its flag on the world record for CPV systems earlier this year at 35.9 percent.

– See more at: RenewEconomy

This article above was from 2013. In 2016 the highest efficiency of a solar panel validated was 24.1%, far below the 44.4% claimed in 2013. In 2017 the most efficient solar panel on the market was 22.2%, so either the technology has been declining since 2013 or (more likely) there I’m not comparing apples to apples, what you can actually buy vs what has been achieved in the laboratory.

Solar cells convert the sun’s energy into electricity by converting photons into electrons. A new solar cell design could raise the energy conversion efficiency to over 50% by absorbing the spectral components of longer wavelengths that are usually lost during transmission through the cell. These findings were published on April 6 in the online edition of Nature Communications.

Read more at:

The highest solar cell conversion rate in 2018 for a solar panel on the market today seems to be the Sunpower X Series, SPR-X21-345 with a conversion rate of 21.5%, again less than previous years.

When it comes to solar panels, it seems they don’t make them like they used to, but again, there is a difference between lab success, consumer availability. A Wikipedia graphic does show a 46% efficiency having been achieved by Fraunhofer ISE/Soitec in about 2015, but everything since that is much less. It’s like that branch of research ended for some reason.



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