Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
The use of low-boiling-point halogenated solvents is common in lab-scale organic solar cell (OSC) fabrication to achieve high power conversion efficiencies (PCEs), but their high volatility hinders large-scale fabrication. High-boiling-point, non-halogenated solvents are adopted as alternatives, but they often result in significant efficiency losses due to inferior morphology. In this work, we adopt a simplified process using toluene as a less hazardous solvent, enabling scalable and industrial production without any post-treatment. We introduce two giant guest acceptors (G-1O and G-3O), featuring distinct oxygenated side chains, to modulate molecular interactions, pre-aggregation in solution, crystallization kinetics, and dielectric constant within the PM6:BTP-eC9 blend. The incorporation of giant acceptors effectively prolongs the crystallization time, inhibiting rapid acceptor aggregation and promoting smaller phase separation. Moreover, the addition of G-1O which has a shorter oxygenated side chain exhibits a more homogeneous phase separation. In contrast, G-3O featuring a longer oxygenated side chain, induces uneven phase separation. Therefore, the G-1O-based ternary device achieves an outstanding PCE of 19.90% in a small-area cell without anti-reflection coating (ARC), which further increases to 20.02% with ARC. Notably, a high PCE of 16.97% is also obtained in a large-area module (15.6 cm², without dead zone). These findings highlight the critical role of oxygenated side-chain engineering in guest molecules for tuning crystallization kinetics under toluene processing, achieving record performance.
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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.
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