Imec pushes perovskite tandem silicon mini-module to record 23.9% conversion efficiency

Share on facebook
Facebook
Share on twitter
Twitter
Share on linkedin
LinkedIn
Share on reddit
Reddit
Share on email
Email
Several new engineering tricks were used to boost the tandem mini-module to 23.9% conversion efficiencies, which included a better engineered perovskite material (CsFAPbIBr), an anti-reflection texturing process on the surface of the module as well as depositing a higher (air, 1.44) refractive index matching liquid between the perovskite module and IBC silicon cell. Image: imec

Nanoelectronics research centre imec has taken a perovskite/silicon tandem mini-module-on-cell stack to a record 23.9% conversion efficiency, significantly exceeding its 20.2% efficiency figures reported in 2016. 

In 2016, imec used a semi-transparent perovskite mini-module, which was developed in collaboration with Solliance that was stacked on top of a high-efficiency interdigitated back-contact (IBC) crystalline silicon solar cell in a four-terminal tandem configuration with an aperture area of 4cm2 to produce 20.2% conversion efficiency.

Several new engineering tricks were used to boost the tandem mini-module to 23.9% conversion efficiencies, which included a better engineered perovskite material (CsFAPbIBr), an anti-reflection texturing process on the surface of the module as well as depositing a higher (air, 1.44) refractive index matching liquid between the perovskite module and IBC silicon cell.

“Two innovations are key to this achievement,” explained Tom Aernouts, group leader for thin-film photovoltaics at imec and perovskite PV program manager at Solliance. “First, a different perovskite material (CsFAPbIBr) was used, largely improving the stability and conversion efficiency of the 4cm² semi-transparent perovskite module to 15.3 percent. Second, the architecture of the stack was optimized for minimal optical losses by adding an anti-reflection texture on top of the module and a refractive index matching liquid between the perovskite module and the Si solar cell.”

Imec noted that the four-terminal tandem mini-module had matched aperture areas as large as 4cm2 for the perovskite module and the Si solar cell.

“Having matched areas of this size makes the fabrication technology more attractive to the solar cell industry,” added Aernouts. “For reference, we have also fabricated a stack of a small perovskite cell (0.13cm2) on top of an IBC c-Si cell (4cm2). In this configuration, the power conversion efficiency of the small semi-transparent perovskite cell is 16.7 percent, outperforming the larger 4cm2 perovskite module due to better perovskite layer properties. Although less attractive from an industrial point of view, the overall power conversion efficiency of this cell-on-cell stack is as high as 25.3 percent.”

Imec believes that by stacking the perovskite solar cells or modules on top of silicon solar cells is a key route to eventual commercialisation of perovskite material options with power conversion efficiencies potentially above 30% with the opportunity to be relatively low cost for tandem cell roadmaps.

Read Next

June 2, 2021
Solar cell manufacturer Maxwell Technologies has celebrated a record mass production efficiency for its heterojunction (HJ) solar cell.
June 1, 2021
Renewables investor Magnora AG has said it will increase its investment in perovskite solar specialist Evolar, taking a 40.7% stake in the company.
May 31, 2021
Researchers at the University of Sheffield have found a new way to extend the life of perovskite materials by more than three months, paving the way for new solar cell technologies.
May 17, 2021
Researchers from the University of Bath and Imperial College London have shown in a new report how the careful selection of layers within perovskite can prevent against degradation, potentially paving the way for the development of high-performance solar cells.
May 10, 2021
LONGi Solar has set a record conversion efficiency of 25.09% for its N-type monocrystalline bifacial TOPCon cell that has been independently verified by the Institute for Solar Energy Research in Hamelin.
April 12, 2021
Scientists in Australia have used human hair clippings from a Brisbane barbershop to create an ‘armour’ that increases the power conversion efficiency of perovskite solar cells.

Subscribe to Newsletter

Upcoming Events

Upcoming Webinars
August 19, 2021
At 9am (PT) | 6pm (CEST)
Solar Media Events
August 25, 2021
Solar Media Events
October 6, 2021
Solar Media Events
October 19, 2021
BRISTOL, UK