Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Perovskite solar cells (PSCs) have attracted increasing attention from both academia and industry as a promising candidate for next-generation photovoltaics, including lightweight, flexible, and tandem applications. Their power conversion efficiencies (PCEs) have recently reached values comparable to those of crystalline Si solar cells. However, most high-efficiency PSCs are fabricated by solution processes, such as spin-coating for small-area devices and slot-die coating for large-area modules, which typically rely on high-boiling-point solvents such as DMF and DMSO. Residual solvents in perovskite films have been reported to accelerate device degradation, which remains a concern for long-term stability and industrial deployment. Vacuum deposition offers a solvent-free alternative that is compatible with uniform, large-area film formation and with existing thin-film manufacturing lines.
In this work, we fabricated semitransparent p-i-n PSCs based on CsxFA1-xPbI3, in which the perovskite layer was formed on a hole-transport layer (HTL) by sequential evaporation of the inorganic precursors followed by organic halide deposition. Spin-coated reference devices with the same nominal composition were fabricated on the same HTL. Our best vacuum-deposited device achieved a PCE of approximately 20%, approaching that of the best spin-coated device but still about 2% (absolute) lower. Under continuous 1-sun illumination at 85 °C in N2 under open-circuit conditions over several hundred hours, the vacuum-deposited devices showed markedly slower degradation than the spin-coated devices. These results suggest that solvent-free vacuum deposition of the perovskite layer can achieve efficiency approaching that of solution processing while improving stability under illumination at elevated temperature. This dry process thus offers a promising route toward the industrial-scale fabrication of durable PSCs.
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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.