Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
As the emission spectrum of indoor lighting has a more limited wavelength range compared to sunlight, the ability to tune the bandgap of perovskite compounds is advantageous for improving power conversion efficiency (PCE) in indoor environments. Whilst the bandgap of perovskite compounds can be widened by increasing the bromide ratio at the X-site, perovskites with a wide bandgap are prone to phase segregation. Sugimoto et al. introduced chloride at the X site to suppress phase segregation in a wide-bandgap perovskite.[1] Here, we synthesized a Cs-rich chloride-containing triple-cation/triple-halide perovskite, Cs₀.₆FA₀.₃MA₀.₁Pb(I₀.₇₀Br₀.₂₅Cl₀.₀₅)₃, and confirmed that its band positions range from –3.76 to –5.58 eV. Furthermore, we fabricated a perovskite solar cell with a layered structure of ITO/SnO₂/Cs₀.₆FA₀.₃MA₀.₁Pb(I₀.₇₀Br₀.₂₅Cl₀.₀₅)₃/Spiro-OMeTAD/Au, and performed current–voltage (J-V) measurements under simulated sunlight (AM1.5G, 100 mW/cm²). The obtained data were VOC of 0.999 V, JSC of 14.0 mA/cm², FF of 0.374, and PCE of 5.19% in forward bias. It is evident from these results that the VOC is lower than that of typical wide-bandgap perovskites. [2,3] This reduction is considered to be caused by increased charge recombination resulting from mismatches in the energy-level alignment and interfacial properties between the perovskite absorber and the charge transport layers. In this study, we aimed to improve solar cell performance by optimizing the device structure through device simulations and improving interfacial properties through additive engineering. By introducing 5-AVAI as an additive, we aimed to suppress interfacial defects and charge recombination, thereby improving the open-circuit voltage (VOC), as shown in Fig. 1.
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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.