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Key Flaw in Solar Panel Efficiency Identified
- shereadsthenews 7y agoThe article is very poorly written and contains several major errors. "As the electronic charge in the solar cells gets transformed into sunlight"? The original announcement is at [1]. One wonders if this kind of research is relevant. Utility-scale PV does not use the very highest quality silicon panels. They just get a lot of cheap land. Panel efficiency is mostly of interest for space flight and other exotic applications where ordinary silicon panels aren't even used. Unless this makes panels cheaper on a per-joule basis, do we care? 1: https://www.manchester.ac.uk/discover/news/solar-cell-defect-mystery-solved-after-decades-of-global-effort/ https://www.manchester.ac.uk/discover/news/solar-cell-defect...
- childintime 7y ago> Panel efficiency is mostly of interest for space flight Surely fundamental research is beneficial to all applications. That said, and as you say, price performance is and should be the primary (research) driver.
- riffraff 7y agoisn't panel efficiency important for end-user-installed panels, rather than large power producers' installations? E.g. home use, or factories.
- adrianN 7y agoEuros per installed Watt is the important metric. It has been dominated by installation cost (not panel cost) for a while now.
- pgeorgi 7y agoI'm not entirely sure but the paper seems to indicate that the defect has an impact on the maximum life of a panel - fixing that would directly impact installation cost (by spreading it over a longer life time).
- blix 7y agoSeems to me that the degeredation they discuss here operates on a very short time scale, completed within a few hours. This result is unlikely to matter significantly for lifetime.
- sgt101 7y agoMy reading was that you lose 2% for the whole life of the panel, until now no one knew why. So, you could do 2% less installation or get 2% more for the investment, if there is a fix for the issue.
- blihp 7y agoYou lose 10% of the power output of the solar panel. i.e. solar panels utilize 20% of the solar energy they receive but within hours that drops to 18% for the life of the panel. So yes, it's a 2% absolute drop relative to the solar energy the panel receives, but it's 10% of what the panel was ever able to produce.
- walrus01 7y agoGood quality silicon cell pv panels are typically warranted to produce 83% of their original output after 25 years. Degradation is calculated into long term financial figures for really big photovoltaic systems. You'll see the warranty examples if you look at the PDF datasheets from the top ten manufacturers of 60 and 72 cell panels. Similar for CdTE and other more exotic thin films.
- sgt101 7y agoSo if we could stop that degradation, or change the profile of it, then the calculations would yield better investment returns?
- roel_v 7y agoIt's one metric, not the only one. Im my residential installation, I was constrained by roof surface. Given certain subsidies, it would have made economic sense for me to pay more per watt if that had meant I could have produced more overall (up to a point, of course).
- walrus01 7y agoUsing an example of current generation silicon cells, it certainly makes sense not to buy a lot of old technology polycrystalline 72 cell panels with a 300W rating, if you can buy mono si 72 cell 365-370W rated panels instead. There is only so much space on a house roof for a dozen or two dozen, 2.0 x 1.0 meter size panels. But beyond "top grade 156mm mono cells", such as you can get in a new 360W stc rated panel, there is significantly diminished returns in dollars per watt. Yes you can get sunpower 23% efficient panels but they will literally cost twice as much.
- cheerlessbog 7y agoYes if your goal was to be as independent from the grid as possible. My guess is most people putting them on their roof mostly care about minimizing their long term energy expenditure net of costs.
- Gibbon1 7y agoI tried reading the paper. Seems relevant. if changes to manufacturing processes can eliminate the problem then you get a 10% improvement in power output.
- zeristor 7y agoOne of the big recent improvements was to use lasers to anneal foundry quality silicon to bring them up to par to use for PV. Although to counter that point more of the cost is in the infrastructure to process the electricity.
- dang 7y agoUrl changed from https://www.sciencealert.com/scientists-identify-a-key-flaw-in-solar-panel-efficiency-after-40-years-of-searching https://www.sciencealert.com/scientists-identify-a-key-flaw-..., which points to this.
- perfunctory 7y ago> for every kW of equivalent sunlight, about 200W of electrical power can be generated. I wish journalists learned to use consistent units. 0.2kW would be better.
- deleted 7y ago[deleted]
- lightedman 7y agoI wish journalists would actually get with state of the art. Current out-of-the-lab state-of-the-art cell efficiency for SJ-monocrystalline cells runs 25%. So for every kWh of sunlight, we're now generating .25kWh of power. And this specific degradation is almost not fixable, because the exact same issue happens with silicon-based LEDs, the Auger/watercooler effect. You need PERFECT junction deposition and PERFECT wafers and PERFECT finger lines and much much more. This is nowhere near as simple as the article makes it out to be.
- cheerlessbog 7y agoJust be glad they didn't mix up kW and kWh ("megawatts per year")
- the8472 7y agoActual paper: https://aip.scitation.org/doi/pdf/10.1063/1.5091759 https://aip.scitation.org/doi/pdf/10.1063/1.5091759