Publication date: 11th March 2026
Wide-bandgap perovskite solar cells (PSCs) based on Br-rich and Br/Cl compositions enable the high photovoltages required for tandem photovoltaics, unassisted solar-driven water splitting, and emerging applications such as indoor photovoltaics (IPV) and building-integrated photovoltaics (BIPV). Full-bromide FAPbBr3 represents a benchmark system, combining a large bandgap of 2.28 eV with compositional simplicity and intrinsic halide stability. Extending this class to mixed Br/Cl perovskites allows further bandgap widening but introduces challenges related to crystallization kinetics, optoelectronic losses, and halide redistribution. Across both systems, suppressing nonradiative recombination and interfacial energy losses is essential for high-performance devices.
We first report on full-bromide FAPbBr3 PSCs developed for unassisted photovoltaic-electrochemical (PV-EC) water splitting. To meet the high voltage requirements imposed by thermodynamic and kinetic overpotentials, nonradiative recombination is minimized through dual passivation: formamidinium thiocyanate (FASCN) for bulk passivation and 1,3-propane diammonium iodide (PDAI2) for surface passivation. This promotes larger grain growth, reduces interfacial recombination, and improves charge extraction. Further optimization of the electron-transport layer using a ternary fullerene blend (PCBM:CMC:ICBA) improves energetic alignment and suppresses interfacial losses, increasing open-circuit voltage (VOC) from 1.41 to 1.60 V and yielding a power conversion efficiency of 9.4% in small-area devices. Scaled to a 1.0 cm2 active area and integrated into a PV-EC system with Pt and RuO2 catalysts, the device achieves continuous solar-driven water splitting with a solar-to-hydrogen (STH) efficiency of 6.5%, the highest reported for a single-absorber system.[1]
Starting from full-bromide FAPbBr3, we investigate mixed Br/Cl perovskites with chloride incorporation up to 80%. Structural and optical measurements confirm full chloride incorporation, resulting in lattice contraction and bandgap widening up to 2.85 eV, along with shifts in the valence and conduction band edges and altered film morphology. In situ UV-vis spectroscopy shows that higher chloride content retards crystallization, consistent with stronger Pb–Cl bonding. Mixed Br/Cl perovskites exhibit light-induced halide segregation, with remixing after dark storage. Time-resolved and absolute photoluminescence measurements indicate similar carrier lifetimes, but higher bandgaps yield increased quasi-Fermi level splitting alongside larger nonradiative voltage losses. Focusing on a 20% chloride composition, targeted bulk and surface engineering with small cesium incorporation and F-PEACl passivation effectively suppresses nonradiative recombination, hysteresis, and halide segregation, improving performance and stability. This approach is extended to 40% and 60% chloride devices.
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.