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Ulrich W. Paetzold
Dr. Ulrich W. Paetzold
Advanced Optics and Materials for Next Generation Photovoltaics

Phone: +49 721 608-26357
ulrich paetzoldWqd7∂kit edu

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Advanced Optics and Materials for Next Generation Photovoltaics

Dr. Ulrich W. Paetzold

Our group researches the interaction between light and structured matter for the purpose of engineering novel optical concepts and nanophotonic materials for next generation photovoltaics. The photovoltaic technologies in focus of our studies are perovskite thin-film solar cells and perovskite based multijuntion solar cells. Our work involves the fabrication, characterization, simulation and understanding of the device physics of perovskite photovoltaics.

Perovskite Solar Cell with Nanophotonic Electrodes

Perovskite/CIGS Solar Module Reaches Efficiency of 17.8%

Nanophotonic Electrodes

Solution-Processed for Perovskite Photovoltaics

Prototype Optical Cloak Metal Contacts


We are looking for highly motivated students interested in the areas of optics/photonics and thin-film photovoltaics. Three categories of positions are offered:

  • Ph.D. thesis
  • Bachelor/Master thesis
  • Internships (min. 4 months)

If you are interested, contact us via mail. Please describe your interests and background. A CV, transcript of records and list of recommendations are highly appreciated.

Dr. Ulrich W. Paetzold


January 2017 - Paper on perovskite solar modules published by our collaborators [DOI: 10.1109/JPHOTOV.2016.2626144]

January 2017 - Ulrich gave seminar talk at the Helmholtz Center in Berlin. Thanks HZB for the invitation!

November 2016 – The paper of Florian Mathies on inkjet printed perovskite solar cells got published in Journal of Materials Chemistry A [DOI: 10.1039/C6TA07972E]! Great work!

September 2016 – At the PSCO international conference in Genova, we communicated the fruits of our collaboration with imec and ZSW to the perovskite PV community: “Perovskite/CIGS Tandem Thin-Film Solar Module Achieves Efficiency of 17.8%”. See also the press release.

September 2016 – New article of Philipp Brenner on highly stable perovskite lasers published in Applied Physics Letters [DOI: 10.1063/1.4963893]! Great work!

August 2016 - Raphael Schmager joined our team. Warm welcome!

August 2016 - Welcome to our new PhD candidate Malte Langenhorst!

July 2016 – New Paper published by our partners at the IEK5, Forschungszentrum Jülich: “Beyond Bulk Lifetimes: Insights into Lead Halide Perovskite Films from Time-Resolved Photoluminescence” in Physical Review Applied [DOI: 10.1103/PhysRevApplied.6.044017]

June 2016 – Ulrich presents his work on “Energy Yield Modelling of Perovskite/Si Multijunction Solar Cells” at the HOPV conference in Swansea (Great Britain).

June 2016 - Welcome to our new team member Ihteaz Muhaimeen Hossain who joins us as a PhD candidate!

May 2016 - Start of the Helmholtz Young Investigator Group.


Printed colored perovskite solar cells in the form of the KIT logo (Photo: IMT/KIT).
Photovoltaics – Versatile in Form and Color

Researchers and industrial partners develop printed perovskite solar modules for flexible use in buildings (Photo: IMT/KIT).

Das Stiefmütterchen Viola wittrockiana (Foto: Raphael Schmager)
Viola Flower Helps to Advance Light Harvesting in Solar Cells

Scientists at KIT copy microstructures from the viola petal and improve performance of solar cells.

Doctoral student Tobias Abzieher
Best Oral Presentation at EMRS meeting.

06.10.2017 - Doctoral student Tobias Abzieher from the Light Technology Institute received an award for the best student oral presentation in the Fall Meeting of the European Materials Research Society (EMRS) in Warsaw.

IMT’s Solar Race Car at the KIT Open Day 2017
IMT’s Solar Race at the KIT Open Day 2017.

At the KIT Open Day 2017 the photovoltaics experts at IMT organized a Solar Car Race. The event attracted a lot of visitors, who got the chance constructing their own solar-powered electric cars.

Prototype tandem solar module made up of a semitransparent perovskite solar module (on top) and a CIGS solar module (below). (Picture: imec/ZSW/KIT)
Record for Perovskite/CIGS Tandem Solar Module

A prototype of a Perovskite/CIGS  thin-film solar module achieves an efficiency of 17.8 percent and surpasses for the first time the efficiency of separate perovskite and CIGS solar modules (Picture: imec/ZSW/KIT). Article in optics.org.