Publication date: 21st July 2025
Among the diverse array of photovoltaic technologies, organic and perovskite photovoltaics stand out as particularly promising candidates for transparent solar applications, each offering unique advantages. Organic photovoltaics (OPVs), based on an excitonic semiconductor, inherently provide true transparency while simultaneously enabling the harvesting of near-infrared (NIR) light, making them ideal for integration into windows and building facades. Perovskite solar cells, characterized by their direct bandgap and exceptionally high open-circuit voltages (Voc), stand out in capturing high-energy photons in the blue region of the spectrum with very low Voc losses, positioning them most suitable for tandem configurations.
The combination of perovskites with organic PVs into tandem architectures emerges as a natural approach, leveraging the complementary spectral absorption and electronic properties of both materials. Such tandem systems not only improve overall efficiency but also offer tunability of transparency and color rendering index (CRI) through bandgap engineering of the individual layers. This flexibility enables the customization of optical appearance to meet aesthetic and functional requirements.
In this contribution, we outline the fundamental design principles for developing highly efficient, transparent and fully solution processed organic PV modules. Additionally, first fully solution processed transparent wide bandgap perovskite modules will be shown. We further introduce an innovative voltage-matching concept tailored to reconcile the differing voltages of wide-bandgap perovskite and low-bandgap organic cells, addressing a key challenge in tandem device fabrication. Finally, we present the first demonstrators of transparent perovskite-organic tandem modules developed within the European project Citysolar, showcasing their potential for sustainable, aesthetically pleasing, and high-performance building-integrated photovoltaics.
The authors acknowledge the support of the H2020 European project Citysolar, grant agreement number 101007084 and the “Solar Factory of the Future” as part of the Energy Campus Nuremberg (EnCN), which is supported by the Bavarian State Government (FKZ 20.2-3410.5-4-5).
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.