Christian Wolff is a physicist and researcher specializing in the field of photovoltaics, solar energy harvesting and spectroscopy. Currently, he leads a group at the Ecole Polytechnique Federale de Lausanne with a research focus on highly efficient tandem solar cells, setting new standards in the field of emerging photovoltaics. Before that he pursued postdoctoral research at EPFL based on a Marie Skłodowska-Curie fellowship, after pursuing a doctorate at the University of Potsdam, focusing on halide perovskite solar cells. He graduated in Physics from Ludwig-Maximilians-Universität München, focusing on nanoparticular photocatalysts for water splitting. Dr. Wolff’s career is marked by several awards including the prestigious Marie Skłodowska-Curie Actions individual fellowship, the Carl-Ramsauer-Price of the Physical Society of Berlin, and several Publication/Conference Awards. He is dedicated to research and innovation, promoting diversity and inclusion in science, and scientific communication, and contributing to global solutions through science.

Perovskite/perovskite/Si triple junctions by solution processing

Beyond tandem devices triple-junction solar cells offer the opportunity to increase the efficiency of solar cells to 50%. In reality, the best-performing triple-junction devices based on III-V and Si materials reached 36.1%, leaving only a small margin compared to the 33.9% for a tandem device based on perovskite and Si. The fast progress due to the ease of fabrication of perovskite solar cells is a strong advantage to explore the triple-junction concept with this technology. In this presentation I will present our recent progress in this regard and how we combine the three subcells to reach > 26% on laboratory scale devices.