New highly efficient perovskite/silicon tandem solar cells presented at the PSCO-2019 conference
Recently, the researchers from the Young Investigator Group for perovskite tandem solar cells headed by Prof. Steve Albrecht have fabricated a novel perovskite/silicon tandem solar cell.
The scientists implemented various modifications developed in the perovskite lab of the Helmholtz Innovation Lab HySPRINT. The modifications include precise interface engineering and the use of a self-assembled monolayer (SAM) hole transport material in the perovskite top cell to reach open circuit voltages of 1.86 V. For the first time, the SAMs are used for these solar cells. Whereas, it was already shown to be advantageous in single junction perovskite solar cells and led to the world record for perovskite/CIGS tandem solar cells [1,2].
As a result, of these optimizations, the researchers gained 27.5% power conversion efficiency (PCE) - the highest PCE among the research institutions. Eike Köhnen has presented this outcome at the Perovskite Solar Cells and Optoelectronics (PSCO-2019 ) conference in Lausanne, Switzerland. High practical interest of the topic and further improvements stimulated interesting questions and intensive discussion from the conference audience.
 Al-Ashouri, A. et al., Energy Environ. Sci., 2019, DOI: 10.1039/c9ee02268f.