Distinguished Lectures at HZB: Prof. T. Krauss will talk about Photovoltaics and Photonic nanostructures
Solar power has the highest potential among all renewable energy sources, it is clean and practically inexhaustible. Despite the already very high performance of silicon solar cells with 25% efficiency and low costs, a lot of research is yet required in order to realise the vision of a solar-powered society. Can we reduce module cost by integrating solar cells into buildings? Can we improve efficiency without increasing cost, by adding low-cost materials such as perovskites? What role can photonic nanostructures play to help control the flow of light?
One of the main problems of photovoltaics is that the sun does not shine much in winter or at night. Can nanophotonics contribute to the storage problem? Thomas Krauss will discuss these and related questions with the goal of informing future research into nanostructures for photovoltaics.
The D-lecture will open the European Workshop on Nanophotonics for Solar Energy – Current Trends and Future Challenges on 25th and 26th November.
Time and location:
We cordially invite you to the talk of Prof. Thomas Krauss, York University, UK.
Date: 25th November 2015 at 11 o’clock am.
Location: lecture hall of the Wilhelm-Conrad-Röntgen-Campus of HZB
After Prof. Krauss’ presentation we will have a lunch buffet and time for informal discussion in the BESSY foyer.
About the speaker:
TF Krauss is a full professor at the University of York, UK, where he leads the Photonics research group and the cleanroom facility in the York Nanocentre. He has published 280 refereed journal articles, with 12000 lifetime citations and an “h” factor of 59, as well as 5 patents. His expertise is in the design and fabrication of photonic crystals and photonic nanostructures where he has made pivotal contributions that turned photonic crystals from an academic curiosity into the ubiquitous concept in Photonics that they are today.
- CIGS-perovskite tandem cell achieves record efficiency of 25.5 %A Berlin-based team from HZB and Center for the Science of Materials Berlin (CSMB) at the Humboldt-Universität zu Berlin has set a new record for a tandem solar cell. Using a combination of a CIGS semiconductor layer and perovskite, along with several optimised intermediate layers, they were able to convert 25.5% of sunlight into electrical energy. The previous record for this combination of materials and this size of cell stood at 24.6%. The new record has been certified and is visible in the prestigious Solar Cell Efficiency Tables (the "Green Tables"), which serve as the definitive ledger for the global photovoltaic community.
- Disorder creates new properties in compound semiconductorsAn international research team has demonstrated that the intrinsic disorder of the compound semiconductor CuInSnS₄ can be exploited to influence its optical properties. While the atomic vibrations also sense the local disorder, their response is averaged over many different local environments and therefore appear isotropic, as expected for a cubic crystal. In contrast, the optical excitations, known as excitons, are much more sensitive to the local arrangement of atoms. Surprisingly, they show a direction-dependent optical response even though the average crystal structure is cubic. These findings shed new light on the relationship between disorder and material properties, opening up new options for targeted 'disorder engineering' in optoelectronic and photocatalytic devices.
- Perovskite solar cells: Predictions of long-term stabilityReliable statements about the long-term stability of perovskite solar cells are still difficult to make. However, a new study by Dr Carolin Ulbrich’s team, published in the renowned journal Joule, highlights which methods are useful for this purpose and identifies areas where further research is needed.