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Home News

NREL Scientists Explore How To Make PV Even Greener

Urja Daily by Urja Daily
July 4, 2022
in News, Solar
Reading Time: 3 mins read
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NREL
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How do we reduce the carbon impact of an already green technology?

This is the question that NREL researchers Hope Wikoff, Samantha Reese, and Matthew Reese tackle in their new paper in Joule, “Embodied Energy and Carbon from the Manufacture of Cadmium Telluride and Silicon Photovoltaics.”

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In the paper, the team focuses on the two dominant deployed photovoltaic (PV) technologies: silicon (Si) and cadmium telluride (CdTe) PV. These green technologies help reduce carbon emissions and meet global decarbonization goals—but their manufacturing processes can themselves result in greenhouse gas emissions.

“Green technologies are awesome, but as we are working to scale them up to an incredible magnitude, it makes sense to take a close look to see what can be done to minimize the impact,” said Samantha Reese, a senior engineer and analyst in NREL’s Strategic Energy Analysis Center.

To understand the overall impact of these green technologies on global decarbonization goals, the team looked beyond traditional metrics like cost, performance, and reliability. They evaluated “embodied” energy and carbon—the sunk energy and carbon emissions involved in manufacturing a PV module—as well as the energy payback time (the time it takes a PV system to generate the same amount of energy as was required to produce it).

“Most advances have been driven by cost and efficiency because those metrics are easy to evaluate,” said Matthew Reese, a physics researcher at NREL. “But if part of our goal is to decarbonize, then it makes sense to look at the bigger picture. There is certainly a benefit to trying to push efficiencies, but other factors are also influential when it comes to decarbonization efforts.”

“One of the unique things that was done in this paper is that the manufacturing and science perspectives were brought together,” Samantha Reese said. “We combined life-cycle analysis with materials science to explain the emission results for each technology and to examine effects of future advances. We want to use these results to identify areas where additional research is needed.”

The manufacturing location and the technology type both have a major impact on embodied carbon and represent two key knobs that can be turned to influence decarbonization. By looking at present-day grid mixes in countries that manufacture solar, the authors found that manufacturing with a cleaner energy mix—compared to using a coal-rich mix—can reduce emissions by a factor of two. Furthermore, although Si PV presently dominates the market, thin-film PV technologies like CdTe and perovskites provide another path to reducing carbon intensity by an additional factor of two.

This insight matters because of the limited carbon budget available to support the expected scale of PV manufacturing in the coming decades.

“If we want to hit the decarbonization goals set by the Intergovernmental Panel on Climate Change, as much as a sixth of the remaining carbon budget could be used to manufacture PV modules,” Matthew Reese said. “That’s the scale of the problem—it’s a massive amount of manufacturing that has to be done in order to replace the energy sources being used today.”

The authors’ hope is that by illustrating the magnitude of the problem, their paper will cause people to take another look at the potential use of thin-film PV technologies, such as CdTe, and manufacturing with clean grid mixes.

Ultimately, accelerating the incorporation of low-carbon energy sources into the electrical grid mix is paramount.

“One of the big strengths of PV is that it has this positive feedback loop,” said Nancy Haegel, center director of NREL’s Materials Science Center. “As we clean up the grid—in part by adding more PV to the grid—PV manufacturing will become cleaner, in turn making PV an even better product.”

Tags: EnergyGreen TechnologyNRELPhotovoltaicsPV technologies
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