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New perovskite LED emits a spin-polarized glow

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New perovskite LED emits a spin-polarized glow

The inclusion of a special new perovskite layer has enabled scientists to create a “spin-polarized LED” without needing a magnetic field or extremely low temperatures, potentially clearing the path to a raft of novel technologies.

Details of the research conducted at the National Renewable Energy Laboratory (NREL) and the University of Utah appear in the journal Science.

Researchers at NREL and around the world have been investigating the use of perovskite semiconductors for solar cells that have proven to be highly efficient at converting sunlight to electricity. Since a solar cell is one of the most demanding applications of any semiconductor, scientists are discovering other uses exist as well.

“We are exploring the fundamental properties of metal-halide perovskites, which has allowed us to discover new applications, beyond photovoltaics,” said Joseph Luther, a co-author of the new paper, “Chiral-induced spin selectivity enabling a room-temperature spin light-emitting diode.” “Because metal-halide perovskites, and other related systems, are some of the most fascinating semiconductors, they exhibit a host of novel phenomena that can be utilized in transforming energy.”

The other co-authors from NREL are Matthew Beard, a senior research fellow and director of the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), Young-Hoon Kim, Yaxin Zhai, Haipeng Lu, Chuanxiao Xiao, E. Ashley Gaulding, Steven Harvey, and Joseph Berry. Valy Vardeny and Xin Pan are co-authors from Utah. All are part of CHOISE, an Energy Frontier Research Center (EFRC) funded by the Office of Science within DOE.

The goals of the CHOISE EFRC are to control the interconversion of charge, spin, and light using carefully designed chemical systems. Most opto-electronic devices in use today only control charge and light and not the spin of the electron. An electron can have either “up” or “down” spins. Using two different perovskite layers, the researchers were able to control the spin by creating a filter that blocks electrons “spinning” in the wrong direction.

One way to produce spin-polarized currents is through a “chiral-induced spin selectivity” layer, where the transport of electrons with “up” or “down” spin states depends upon the chirality of the transporting materials. Chirality refers to the materials structure where it is not identical to its mirror image. For example, a “left-handed” oriented chiral system may allow transport of electrons with “up” spins but block electrons with “down” spins and vice versa.

The filter enabled the researchers to inject spin-polarized charges into a light-emitting diode (LED) at room temperature–instead of at hundreds of degrees below zero Fahrenheit–and without the use of magnetic fields or ferromagnetic contacts that are typically needed to control the spin degree of freedom.

The LED, in response, emits light with special chiral properties, accordingly. The concept proves that using these chiral-hybrid systems gains control over spin without magnets and has “broad implications for applications such as quantum-based optical computing, bioencoding, and tomography,” according to Beard.



SOLAR DAILY
Producing highly efficient LEDs based on 2D perovskite films

Hong Kong (SPX) Mar 11, 2021


Energy-efficient light-emitting diodes (LEDs) have been used in our everyday life for many decades. But the quest for better LEDs, offering both lower costs and brighter colours, has recently drawn scientists to a material called perovskite. A recent joint-research project co-led by the scientist from City University of Hong Kong (CityU) has now developed a 2D perovskite material for the most efficient LEDs.

From household lighting to mobile phone displays, from pinpoint lighting needed for endosc … read more

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Buck the Duck Curve: California’s Bold Leap Towards Solar Empowerment

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Buck the Duck Curve: California’s Bold Leap Towards Solar Empowerment


Buck the Duck Curve: California’s Bold Leap Towards Solar Empowerment

by Bradley Bartz, President/Founder, ABC Solar

Los Angeles CA (SPX) Apr 23, 2024






In the sun-drenched state of California, solar power has been both a beacon of hope and a point of contention. At the heart of this debate lies the infamous “Solar Duck Curve”-a phenomenon critics have used to demonize the impact of solar power on the energy grid. This curve, which charts the mismatch between peak solar production and peak demand, has been portrayed as a nightmare for grid management. However, much like the visionary approach of Hong Kong’s free phone service in the past, California has the potential to transform this perceived problem into a profitable solution.

The Buck Load Initiative: A Call to Action

Governor Gavin Newsom has a golden opportunity to rewrite the narrative. Just as Hong Kong revolutionized communication by offering free phone service, making long distance calls economically accessible and turning a high-cost luxury into a distributed wealth generator, California can harness the currently curtailed solar power to fuel new economic frontiers.



Today, the reality is that the production of solar energy often exceeds demand during daylight hours, leading to what is known as ‘curtailment’. This means valuable, clean energy-energy that could power homes, businesses, and innovative technologies-is wasted. It’s akin to collecting rainwater in a drought-stricken land but pouring it down the drain just when it’s needed most.



Why The Buck Load?

The Buck Load is more than just a concept; it’s a directive for progress. This initiative proposes using surplus solar energy to power high-demand facilities and projects, such as high-speed wind tunnels for wildfire research or new industrial complexes, creating jobs and fostering innovation. It’s a win-win scenario where excess energy meets peak ingenuity, fostering a robust, sustainable economy.



Imagine this: instead of shutting down solar panels, we channel excess energy into research facilities, manufacturing plants, and even cryptocurrency mining operations-anywhere that can use high amounts of electricity outside of peak hours. We could turn every ray of sunshine into a thread in the fabric of a new economic miracle.



A Vision for the Future

As the President and Founder of ABC Solar, I’ve seen firsthand the capabilities and the limitations of our current energy practices. It’s time for a bold step forward. The Buck Load isn’t just about energy; it’s about setting a precedent for how we value and utilize our natural resources. It’s about ensuring that every Californian has the power they need, not just to survive, but to thrive.



Governor Newsom, the California Public Utilities Commission, and all stakeholders in our energy future are at a crossroads. We can continue down a path of restrictions and limitations, or we can choose a path of innovation and abundance. The Buck Load is the key to unlocking a future where California continues to lead the world in environmental consciousness and economic innovation.



Let us not be the Mr. Burns of our own narrative, shading the world from the potential of solar power. Let’s be the pioneers who used the sun to light up not just our homes, but our economy. Let’s make The Buck Load initiative a reality and show the world what California can do.



The time is now. Let’s not wait for tomorrow to solve the problems we can solve today. Let’s harness the full potential of the sun, and in doing so, fund our future-a future as bright as the California sun.


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All About Solar Energy at SolarDaily.com





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Efficient DC power converter enhances microgrid sustainability

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Efficient DC power converter enhances microgrid sustainability


Efficient DC power converter enhances microgrid sustainability

by Riko Seibo

Tokyo, Japan (SPX) Apr 22, 2024






A novel DC-DC power converter developed by Kobe University promises enhanced energy storage and conversion efficiency, marking a key step in advancing microgrid technologies. This new converter, designed to integrate seamlessly with various DC energy sources, improves system stability and simplicity with an unprecedented operational efficiency.

Electric power is classified into two types: AC (alternating current) and DC (direct current). Despite AC being the chosen standard for national power grids, the reliance on DC power by solar panels, batteries, electric vehicles, and computers necessitates a conversion, often with significant energy loss. The adoption of DC microgrids could mitigate this by directly linking renewable energy sources and storage units to consumers, eliminating the need for conversion and allowing for voltage flexibility essential for diverse applications.



Researchers from Kobe University and National Chung Hsing University, including MISHIMA Tomokazu and LAI Ching-Ming, have spearheaded the development of this technology. “Our interdisciplinary approach and advanced facilities have underpinned our success in developing a prototype that demonstrates significant advantages over existing systems,” explained LIU Shiqiang, a student team member at Kobe University.



The new design, featured in the journal IEEE Transactions on Power Electronics, optimizes voltage ratio and inductor current balance, improving performance for electric vehicle-centric applications. “The asymmetrical duty limit control is particularly beneficial for electric vehicle-connected DC microgrids,” Liu added.



The prototype’s effectiveness, showing efficiencies up to 98.3%, underscores its potential for real-world application and sets the stage for further enhancements and commercialization efforts by UPE-Japan, a startup emerging from Kobe University. “Our aim is to foster the shift towards more reliable and sustainable energy solutions, especially for electric vehicles and renewable energy systems,” Liu stated.



Research Report:Over 98% Efficiency SiC-MOSFET based Four-Phase Interleaved Bidirectional DC-DC Converter Featuring Wide-Range Voltage Ratio


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Powering The World in the 21st Century at Energy-Daily.com





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‘Ancient Roman’ solar roof tiles power Pompeii villa

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‘Ancient Roman’ solar roof tiles power Pompeii villa


‘Ancient Roman’ solar roof tiles power Pompeii villa

By Ella IDE

Pompeii, Italy (AFP) April 19, 2024






Pompeii is shining a light on mysterious rites of ancient Rome thanks to terracotta-style solar roof tiles installed on one of its most famous villas.

The traditional-looking tiles have solar photovoltaic cells inside, allowing the UNESCO World Heritage Site to preserve its aesthetics while generating clean energy to illuminate its frescoes.

And though the project is in its early stages, experts say the tiles could one day help historic city centres across Italy turn green.

The tiles look “exactly the same as the ancient (Roman) ones”, found in archaeological sites and cities across the Mediterranean, Pompeii director Gabriel Zuchtriegel told AFP.

But while “Pompeii is a unique site due to its vast size and complexity … I hope this will not be a unique project,” said Zuchtriegel, who wants the site near Naples to be a “real-life lab for sustainability”.

The scheme weds emerging technologies with an extraordinary mural unearthed in 1909 under deep layers of volcanic ash at the Villa of the Mysteries, which was buried along with the rest of the city when Vesuvius erupted nearly 2,000 years ago.

The mural depicts female devotees of Dionysus — the god of wine and revelry — engaged in mysterious rites.

They have intrigued scholars for decades, with some historians suggesting they are evidence that the lady of the villa was a priestess whose slaves took part in cult rituals.

– Terracotta varnishes –

The fresco, which covers three walls and is one of the best preserved in Pompeii, is illuminated by special LED lights designed to bring the deep red, purple and gold images to life, while not damaging the painted surfaces.

The lights are powered by electricity generated by the solar panels, which were installed in October.

Ahlux, the Italian company behind the lights, patented the system in 2022 and produces both curved and flat panels varnished in terracotta tones.

The solar panels on the villa’s roof are flat and lie between traditional ceramic curved tiles.

They cover 70 square metres (750 square feet) of roof, produce a maximum of 13 kilowatt-hours and are linked to an ecologically-friendly sodium battery, according to project manager Alberto Bruni.

Pompeii, which gets over 15 hours sunlight a day in peak summer, intends to extend their use to other villas in the archaeological site, he said.

Augusto Grillo, the founder of Ahlux, said the tiles are about five percent less efficient than a traditional solar panel.

“This nominal loss is compensated however by the fact that our panels heat up less in summer,” while traditional ones are covered by glass, and can lose efficiency on very hot days, he said.

“The performance ends up being very similar,” he said.

– Red-tiled cities –

Various institutions have expressed interest in the tiles, from Rome’s MAXXI modern art museum to the 17th century Pinoteca Ambrosiana museum in Milan, Grillo said.

“The problem is finding the funds,” he said, adding that many of Italy’s famous historic buildings are public or owned by Catholic institutions.

The cost is a bit more than the price of a new roof and traditional panels put together — though the solar tiles, which last between 20 to 25 years, serve double duty, because they function as a roof too, Grillo said.

Project manager Bruni said the cost of the panels “is coming down”, meaning they may be able to play a part in the wider ecological transition.

Italy is under pressure to make red-roofed cities such as Florence or Bologna greener as part of efforts to combat climate change.

The European Union aims to reduce carbon emissions by 55 percent compared with 1990 levels by 2030, and will have to upgrade existing buildings to do so.

That is a mammoth challenge for Italy, where some 60 percent of buildings are in the worst two energy categories, compared to 17 percent in France and six percent in Germany, according to Italian Constructors’ Association ANCE.

“There needs to be some national and perhaps European co-investment to make sure that the very, very ambitious timelines have a chance of being respected,” Angelica Donati, president of the youth constructors’ association ANCE Giovani, told AFP.

“We have the most beautiful cities in the world, which means we need much more thoughtful interventions, and quickly. There’s a lot to be done”.

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