Institute of Microstructure Technology (IMT)

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

Dr. Malte Langenhorst   Ph.D. in electrical engineering, graduated 2019, “Cloaked contact grids for perovskite-silicon tandem solar modules”
Figure: Demonstration of freedom of choice of printing patterns on millimeter scale by inkjet printing: Digital image files (a) of portraits of some of the researchers at Karlsruhe Institute of Technology (from left to right: Helge Eggers, Fabian Schack
The Optical Society (OSA) features the work of Helge Eggers

The Optical Society (OSA) features the work of Helge Eggers presented on Inkjet-Printed Perovskite Photovoltaics at the Optical Society (OSA) 2020 Advanced Photonics Congress with a press release. Helge Eggers, doctoral student in the research group of Dr. Ulrich W. Paetzold from Karlsruhe Institute of Technology, presented his latest achievements of a perovskite solar cells with inkjet-printed absorber and extraction layers, reaching power conversion efficiencies above 17%.

Figure: Adapted from Eggers et al., Adv. Energy Mater. 2020, 10, 1903184.

Doctoral student Saba Gharibzadeh and Prof. M. Graetzel
Best poster award at the International Conference on Perovskite Solar Cells and Optoelectronics

02.10.2019 - Doctoral student Saba Gharibzadeh from the Institute of Microstructure Technology (IMT) received the best poster award at the International Conference on Perovskite Solar Cells and Optoelectronics in Lausanne (Switzerland). The award was given for her poster on “Record Open Circuit Voltage in High Efficiency Wide-Bandgap Perovskite Solar Cells” by Prof. M. Graetzel.

Logo European Perovskite Initiative (EPKI)
Release of European Perovskite Photovoltaics White Paper.

The Perovskite-Photovoltaics White Paper by the European Perovskite Initiative (EPKI) aims to raise the awareness of perovskite-based photovoltaics with governments, politicians, investors, industries, to support and initiate new generation Perovskite-PV industrial initiatives, and to facilitate joint-research programs and synergies amongst its members. Dr. Ulrich W. Paetzold, coordinator of the Taskforce Perovskite Photovoltaics at KIT, is one of the authors of this endeavour.

For more information:

Doctoral student Raphael Schmager
Best student presentation at the OSA Advanced Photonics Congress

01.08.2019 - Doctoral student Raphael Schmager from the Institute of Microstructure Technology (IMT) received an award for the best student presentation at the OSA Advanced Photonics Congress in San Francisco. The award was given for his oral presentation on “Nanophotonic Perovskite Thin-Film Solar Cells by Thermal Nano-imprint Lithography” in the topical meeting on “Optical Devices and Materials for Solid Energy and Solid-state Lightning”.

Photo: Tobias Abzieher, KIT
High Efficiency Perovskite Solar Cells

A team at KIT has developed an innovative hole conductor layer that can be deposited over a large area and leads to record efficiencies (Photo: Tobias Abzieher, KIT).

German television contribution

Back Cover, Advanced Energy Materials / Volume 9, Issue 21
Cover Advanced Energy Materials

Our recent work on 2D/3D perovskite heterostructures for photovoltaics was highlighted with a cover in Advanced Energy materials.

Inside Front Cover, Advanced Energy Materials / Volume 9, Issue 12
Cover Advanced Energy Materials

In a recent publication, we reported on high‐quality inorganic charge extraction layers which are of key importance for efficient and stable perovskite‐based photovoltaics. The work was published in Advanced Energy Materials and highlighted with a cover.

The cover image is based on the Research Article Energy yield of all thin‐film perovskite/CIGS tandem solar modules by Malte Langenhorst et al., Image Credit: Malte Langenhorst.
Cover Progress in PV

Our recent article “Energy yield of all thin‐film perovskite/CIGS tandem solar modules” by Malte Langenhorst et al. (doi:10.1002/pip.3091) was highlighted as a cover. Have fun reading it!”

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