Publication date: 11th March 2026
Perovskite/CIGS tandem solar cells provide a compelling all–thin-film route toward high-efficiency, lightweight, and flexible photovoltaics. Despite rapid progress, their practical realization remains limited by complex interfacial optical losses, the intrinsic instability of wide-bandgap perovskites, and strain-induced degradation arising from heterogeneous tandem stacks.
In this talk, I will present recent advances from our laboratory that address these challenges through interface engineering, strain regulation, and multiphysics-guided device design. For four-terminal tandems, we identify parasitic absorption in transparent electrodes and interfacial reflection as dominant optical loss pathways, and demonstrate systematic mitigation strategies that enable highly efficient perovskite/CIGS tandems with minimal optical penalties. For monolithic two-terminal tandems, we establish a molecular-level understanding of passivation failure in wide-bandgap perovskites and develop thermodynamically and kinetically stable passivation strategies that suppress cation desorption and under-coordinated Pb defects. Furthermore, we reveal how the surface roughness of the CIGS bottom cell governs strain formation and defect evolution in the perovskite top cell, enabling strain-relieved tandem devices with certified stabilized efficiencies above 28%. Together, these findings establish general, physics-based design principles for efficient, stable, and scalable perovskite/CIGS tandem photovoltaics.
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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.