Sunlight reaches both sides of a bifacial perovskite solar cell, which means it could potentially produce higher energy yields for lower overall costs, according to a new study.
Bifacial solar cells capture direct sunlight on the front and reflected sunlight on the back. As a result, they outperform monofacial solar cells, according to a US Department of Energy National Renewable Energy Laboratory (NREL) study.
“This perovskite cell can operate very effectively from either side,” said Kai Zhu, a senior scientist in the Chemistry and Nanoscience Center at NREL. He’s the lead author of the paper, which was recently published in Joule and is called “Highly efficient bifacial single-junction perovskite solar cells.”
In past research, bifacial solar cells haven’t been able to compete with monofacial cells, which currently have a record of 26% efficiency.
Ideally, a bifacial cell should have a front-side efficiency close to the best-performing monofacial cell and a similar back-side efficiency, according to NREL researchers.
In this latest study, researchers were able to make a solar cell where both sides’ efficiency were comparable. The lab-measured efficiency of the front illumination rose above 23%, and from the back, efficiency was about 91-93% of the front.
The researchers worked out that the perovskite layer on the front of the cell had to be sufficiently thick to absorb most of the photons from a certain part of the solar spectrum, but a perovskite layer that’s too thick can block the photons.
The NREL team also had to figure out the ideal thickness of the rear electrode on the back of the cell to minimize resistive loss.
By utilizing simulations, the team found that the ideal thickness for a perovskite layer is around 850 nanometers. Compare that to a strand of human hair, which is around 70,000 nanometers thick.
They then placed the bifacial cell between two solar simulators and aimed direct light at the front side while the back side received reflected light. The cell’s efficiency climbed as the ratio of reflected light to the front illumination increased.
The research team notes that a bifacial perovskite solar module would cost more to manufacture than a monofacial module. But the more expensive upfront cost would be offset by the bifacial modules’ generation of 10-20% more power.
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Wind energy powered 20% of all electricity consumed in Europe (19% in the EU) in 2024, and the EU has set a goal to grow this share to 34% by 2030 and more than 50% by 2050.
To stay on track, the EU needs to install 30 GW of new wind farms annually, but it only managed 13 GW in 2024 – 11.4 GW onshore and 1.4 GW offshore. This is what’s holding the EU back from achieving its wind growth goals.
Three big problems holding Europe’s wind power back
Europe’s wind power growth is stalling for three key reasons:
Permitting delays. Many governments haven’t implemented the EU’s new permitting rules, making it harder for projects to move forward.
Grid connection bottlenecks. Over 500 GW(!) of potential wind capacity is stuck in grid connection queues.
Slow electrification. Europe’s economy isn’t electrifying fast enough to drive demand for more renewable energy.
Brussels-based trade association WindEurope CEO Giles Dickson summed it up: “The EU must urgently tackle all three problems. More wind means cheaper power, which means increased competitiveness.”
Permitting: Germany sets the standard
Permitting remains a massive roadblock, despite new EU rules aimed at streamlining the process. In fact, the situation worsened in 2024 in many countries. The bright spot? Germany. By embracing the EU’s permitting rules — with measures like binding deadlines and treating wind energy as a public interest priority — Germany approved a record 15 GW of new onshore wind in 2024. That’s seven times more than five years ago.
If other governments follow Germany’s lead, Europe could unlock the full potential of wind energy and bolster energy security.
Grid connections: a growing crisis
Access to the electricity grid is now the biggest obstacle to deploying wind energy. And it’s not just about long queues — Europe’s grid infrastructure isn’t expanding fast enough to keep up with demand. A glaring example is Germany’s 900-megawatt (MW) Borkum Riffgrund 3 offshore wind farm. The turbines are ready to go, but the grid connection won’t be in place until 2026.
This issue isn’t isolated. Governments need to accelerate grid expansion if they’re serious about meeting renewable energy targets.
Electrification: falling behind
Wind energy’s growth is also tied to how quickly Europe electrifies its economy. Right now, electricity accounts for just 23% of the EU’s total energy consumption. That needs to jump to 61% by 2050 to align with climate goals. However, electrification efforts in key sectors like transportation, heating, and industry are moving too slowly.
European Commission president Ursula von der Leyen has tasked Energy Commissioner Dan Jørgensen with crafting an Electrification Action Plan. That can’t come soon enough.
More wind farms awarded, but challenges persist
On a positive note, governments across Europe awarded a record 37 GW of new wind capacity (29 GW in the EU) in 2024. But without faster permitting, better grid connections, and increased electrification, these awards won’t translate into the clean energy-producing wind farms Europe desperately needs.
Investments and corporate interest
Investments in wind energy totaled €31 billion in 2024, financing 19 GW of new capacity. While onshore wind investments remained strong at €24 billion, offshore wind funding saw a dip. Final investment decisions for offshore projects remain challenging due to slow permitting and grid delays.
Corporate consumers continue to show strong interest in wind energy. Half of all electricity contracted under Power Purchase Agreements (PPAs) in 2024 was wind. Dedicated wind PPAs were 4 GW out of a total of 12 GW of renewable PPAs.
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In the Electrek Podcast, we discuss the most popular news in the world of sustainable transport and energy. In this week’s episode, we discuss the official unveiling of the new Tesla Model Y, Mazda 6e, Aptera solar car production-intent, and more.
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The Chinese EV leader is launching a new flagship electric sedan. BYD’s new Han L EV leaked in China on Friday, revealing a potential Tesla Model S Plaid challenger.
What we know about the BYD Han L EV so far
We knew it was coming soon after BYD teased the Han L on social media a few days ago. Now, we are learning more about what to expect.
BYD’s new electric sedan appeared in China’s latest Ministry of Industry and Information Tech (MIIT) filing, a catalog of new vehicles that will soon be sold.
The filing revealed four versions, including two EV and two PHEV models. The Han L EV will be available in single- and dual-motor configurations. With a peak power of 580 kW (777 hp), the single-motor model packs more power than expected.
BYD’s dual-motor Han L gains an additional 230 kW (308 hp) front-mounted motor. As CnEVPost pointed out, the vehicle’s back has a “2.7S” badge, which suggests a 0 to 100 km/h (0 to 62 mph) sprint time of just 2.7 seconds.
To put that into perspective, the Tesla Model S Plaid can accelerate from 0 to 100 km in 2.1 seconds. In China, the Model S Plaid starts at RBM 814,900, or over $110,000. Speaking of Tesla, the EV leader just unveiled its highly anticipated Model Y “Juniper” refresh in China on Thursday. It starts at RMB 263,500 ($36,000).
BYD already sells the Han EV in China, starting at around RMB 200,000. However, the single front motor, with a peak power of 180 kW, is much less potent than the “L” model. The Han EV can accelerate from 0 to 100 km/h in 7.9 seconds.
At 5,050 mm long, 1,960 mm wide, and 1,505 mm tall with a wheelbase of 2,970 mm, BYD’s new Han L is roughly the size of the Model Y (4,970 mm long, 1,964 mm wide, 1,445 mm tall, wheelbase of 2,960 mm).
Other than that it will use a lithium iron phosphate (LFP) pack from BYD’s FinDreams unit, no other battery specs were revealed. Check back soon for the full rundown.