Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Metal halide perovskites have shown great promise to enable highly efficient and low cost tandem solar cells when being combined with silicon. Here, we combine rear emitter silicon heterojunction bottom cells with p-i-n perovskite top cells into highly efficient monolithic tandem solar cells. By optimizing the transparent n-type front contact layer stack, a certified power conversion efficiency (PCE) of 25.0% is achieved at highly unmatched short circuit current densities of the sub-cells. Further improvements of the silicon bottom cell, the top contact and perovskite thickness allowed to increase the JSC above 19.5 mA cm-2, enabling a remarkable tandem PCE of 26.0%, however with a slightly limited fill factor (FF). To test the FF dependency as function of sub-cell mismatch, various illumination spectra are utilized by using a LED based sun simulator. This illumination-variation is also relevant for outdoor applications with the sun spectrum changing over the day and thus highly important for energy yield analysis, especially when comparing 4- and 2-terminal architectures. Interestingly, the unmatched currents improve the FF of the tandem solar cell and thus the loss in tandem PCE due to lower JSC at unmatched conditions is less pronounced. The finding is confirmed by electrical simulations based on input parameters from reference single junction devices. The simulation shows that, especially the FF is not at its full potential in the experiment and reveals an even higher potential of the tandem design.
The authors acknowledge funding from HyPerCell (Hybrid Perovskite Solar Cells, www.perovskites.de) joint Graduate School, as well as from the German Federal Ministry for Economic Affairs and Energy (BMWi) through the “PersiST” project (grant no. 0324037C). Further funding was provided by the Federal Ministry of Education and Research (BMBF) for funding of the Young Investigator Group Perovskite Tandem Solar Cells within the program “Materialforschung für die Energiewende” (grant no. 03SF0540) and by the Helmholtz Foundation within the HySPRINT Innovation lab project.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.