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  * World record back at HZB: Tandem solar cell achieves 32.5 percent
    efficiency

Keywords:

  * energy (407)
  * HySPRINT (48)
  * solar energy (345)
  * Sustainability (161)
  * HZB own research (222)
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News
19.12.2022

World record back at HZB: Tandem solar cell achieves 32.5 percent
efficiency

Photo of the perovskite/silicon tandem solar cell. You can see the
active bluish area in the middle of the wafer, which is enclosed by
the metallic, silvery electrode.

Photo of the perovskite/silicon tandem solar cell. You can see the
active bluish area in the middle of the wafer, which is enclosed by
the metallic, silvery electrode. (c) Johannes Beckedahl/Lea Zimmerman/
HZB

The illustration shows the schematic structure of the tandem solar
cell with a bottom cell made of silicon and a top cell made of
perovskite. While the top cell can utilise blue light components, the
bottom cell converts the red and near-infrared components of the
spectrum. Different thin layers help to optimally utilise the light
and minimise electrical losses.

The illustration shows the schematic structure of the tandem solar
cell with a bottom cell made of silicon and a top cell made of
perovskite. While the top cell can utilise blue light components, the
bottom cell converts the red and near-infrared components of the
spectrum. Different thin layers help to optimally utilise the light
and minimise electrical losses. (c) Eike Kohnen/HZB

Among the emerging technologies, silicon/perovskite tandem cells are
at the absolute top. The last world record by HZB is a big leap
forward.

Among the emerging technologies, silicon/perovskite tandem cells are
at the absolute top. The last world record by HZB is a big leap
forward. (c) NREL

The current world record of tandem solar cells consisting of a
silicon bottom cell and a perovskite top cell is once again at HZB.
The new tandem solar cell converts 32.5 % of the incident solar
radiation into electrical energy. The certifying institute European
Solar Test Installation (ESTI) in Italy measured the tandem cell and
officially confirmed this value which is also included in the NREL
chart of solar cell technologies, maintained by the National
Renewable Energy Lab, USA.

Scientists from HZB could significantly improve on the efficiency of
perovskite/silicon tandem solar cells. "This is a really big leap
forward that we didn't foresee a few months ago. All the teams
involved at HZB, especially the PV Competence Center (PVComB) and the
HySPRINT Innovation lab teams have worked together successfully and
with passion," says Prof. Steve Albrecht.

Interface modifications

His team used an advanced perovskite composition with a very smart
interface modification. The lead authors, postdocs Dr. Silvia
Mariotti, and Dr. Eike Kohnen in Albrecht's team, developed an
interface modification to reduce charge carrier recombination losses
and applied detailed analysis to understand the specific properties
of the interface modification. These developments were then
successfully implemented in tandem solar cells, and with help of
Master's student Lea Zimmermann, combined with further optical
improvements.

In addition, many more scientists and technicians helped to develop
and fabricate the tandem cells to achieve this success. Altogether, 
the interface and optical modifications enabled highest photovoltages
(open-circuit voltage) and resulted in the new record efficiency for
this fascinating tandem technology.  

Fast progress

There is an ongoing efficiency development by various research
institutes and companies over the last years and especially the last
month were quite exciting for the field: Various teams from HZB had
achieved a record value in late 2021 with an efficiency of 29.8% that
was realized by periodic nanotextures. More recently, in summer 2022,
the Ecole Polytechnique Federale de Lausanne, Switzerland, first
reported a certified tandem cell above the 30% barrier at 31.3%,
which is a remarkable efficiency jump over the 2021 value.

With the new certified value of 32.5%, the record is again back at
HZB. "We are very excited about the new value as it shows that the
perovskite/silicon tandem technology is highly promising for
contributing to a sustainable energy supply," says Albrecht.

HZB's scientific director, Prof. Bernd Rech, emphasises: "At 32.5
percent, the solar cell efficiency of the HZB tandems is now in
ranges previously only achieved by expensive III/V semiconductors.
The NREL graph clearly shows how spectacular the last two increases
from EPFL and HZB really are."

red.

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Newsroom

Contact to the experts at HZB:

Prof. Dr. Steve Albrecht
Prof. Dr. Steve Albrecht (030) 8062 - 14690 (030) 8062 - 41346
Email Business card

 

Prof. Dr. Bernd Stannowski
Prof. Dr. Bernd Stannowski (030) 8062 - 15491 (030) +49 174 3230815 
(030) 8062 - 15677
Email Business card

Press officer:

Dr. Antonia Rotger
Dr. Antonia Rotger (030) 8062 - 43733
Email Business card

Links

  * NREL Charts / Emerging PV technologies
  * 24.10.2022 Tandem solar cells with perovskite: nanostructures
    help in many ways
  * 22.11.2021: Almost 30 % efficiency for next-generation tandem
    solar cells
  * 11.12.2020 Perovskite/silicon tandem solar cells on the threshold
    of 30 %

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