Fraunhofer ISE sets new record efficiency for both-sides-contacted solar cell of 26%

Facebook
Twitter
LinkedIn
Reddit
Email
Fraunhofer ISE’s TOPCoRE solar cell, which has set a new record efficiency of 26%. Image: Fraunhofer ISE.

The Fraunhofer Institute for Solar Energy (ISE) has claimed a new record conversion efficiency for a both-sides contacted silicon solar cell of 26%.

Furthermore, Fraunhofer ISE has said the technology used to achieve the record – wherein both sides, front and rear, have metal contacts – holds the potential to push efficiencies up to 27%.

This article requires Premium SubscriptionBasic (FREE) Subscription

Unlock unlimited access for 12 whole months of distinctive global analysis

Photovoltaics International is now included.

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Unlimited digital access to the PV Tech Power journal catalogue
  • Unlimited digital access to the Photovoltaics International journal catalogue
  • Access to more than 1,000 technical papers
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

A team of researchers led by Fraunhofer ISE’s Dr. Armin Richter used Tunnel Oxide Passivating Contact (TOPCon) technology as a basis for the cell’s structure, which the research institute said possessed advantages of low surface recombination losses and efficient charge carrier transport over interdigitated back contact (IBC) cells.

The cell used to achieve the efficiency record however used a formed pn junction on the back side – rather than industrial standard cells which have a pn junction on the front, as a full-surface TOPCon contact.

Fraunhofer ISE said this removed the need for full-surface boron doping on the front side, and only a local boron diffusion directly under the front-side contacts was necessary.

The cell, dubbed TOPCon Rear Emitter Solar Cell (TOPCoRE), allows for higher voltages and fill factors than cells with a collecting emitter on the front, while also allowing for wafers to be used more effectively for charge carrier transport. The front side of the cell is also passivated more effectively.

“Based on a systematic simulation-based analysis, we were able to derive some fundamental design rules for future high-efficiency silicon solar cells above 26 percent efficiency. Both-sides-contacted solar cells have the potential to reach efficiencies up to 27 percent and thus surpass the previous world record for silicon solar cells,” Professor Stefan Glunz, division director of Photovoltaics Research at Fraunhofer ISE, said.

The findings of the efficiency trial were originally published in a Nature Energy article, which can be read here.

21 May 2024
Napa, USA
PV Tech has been running PV ModuleTech Conferences since 2017. PV ModuleTech USA, on 21-22 May 2024, will be our third PV ModulelTech conference dedicated to the U.S. utility scale solar sector. The event will gather the key stakeholders from solar developers, solar asset owners and investors, PV manufacturing, policy-making and and all interested downstream channels and third-party entities. The goal is simple: to map out the PV module supply channels to the U.S. out to 2025 and beyond.
8 October 2024
San Francisco Bay Area, USA
PV Tech has been running an annual PV CellTech Conference since 2016. PV CellTech USA, on 8-9 October 2024 is our second PV CellTech conference dedicated to the U.S. manufacturing sector. The event in 2023 was a sell out success and 2024 will once again gather the key stakeholders from PV manufacturing, equipment/materials, policy-making and strategy, capital equipment investment and all interested downstream channels and third-party entities. The goal is simple: to map out PV manufacturing in the U.S. out to 2030 and beyond.

Read Next

Subscribe to Newsletter

Upcoming Events

Solar Media Events
April 17, 2024
Lisbon, Portugal
Solar Media Events
May 1, 2024
Dallas, Texas
Solar Media Events
May 21, 2024
Sydney, Australia