Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Hybrid organic–inorganic perovskites (HOIPs) exhibit remarkable optoelectronic properties but understanding is limited by complex structure–property coupling between the inorganic BX6 framework and dynamic organic A-site cations. While most studies emphasize the inorganic lattice, A-site cations indirectly tune octahedral tilting, local strain, and defect behavior through hydrogen bonding and steric effects. Quasi-2D HOIPs provide a versatile platform to probe these effects beyond the compositional limits of 3D systems. Here we systematically investigate a series of phase-pure (PA)2APb2I7 thin films with various A-site cations (where PA is n-pentylammonium, and A represents methylammonium (MA), formamidinium (FA), dimethylammonium (DMA), guanidinium (GA), or acetamidinium (AA)) to elucidate A-site control of structure and charge transport. Our findings reveal that incorporating larger A-site cations, which deviate from the ideal tolerance factor, distort the inorganic octahedral network and tune the bandgap. Optical-pump terahertz-probe (OPTP) spectroscopy identifies (PA)2FAPb2I7 as exhibiting the highest charge-carrier mobility among all compositions. These results reveal direct structure-property coupling via A-site cation chemistry and highlight FA-based quasi-2D perovskites as exceptionally promising candidates for high-performance perovskite devices.
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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.