HZB-Highlights 2022 published
© HZB/M.Setzpfand
The Highlights 2022 report on a selection of the most important research results and events at HZB.
This year, the cyber attack made it much more difficult to compile the highlights 2022. But now it's done! One focus in this report is energy research, in which HZB is extraordinarily successful, from basic research to technology transfer. In 2022, HZB teams developed tandem solar cells with record efficiencies, and there was great progress in research on batteries and "green" hydrogen as well. In addition, HZB further expanded its collaborations with industrial partners fostering innovation in the solar industry in Europe. Selected research results from the fields of information and matter provide insights into the diversity of research at HZB and at our X-ray source BESSY II. The report ends with facts, figures, personalia, a short report on the Diversity Charter and a review of special events such as the visit of the swedish King.
- 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.