Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Tin oxide (SnO2) remains the dominant electron transport layer (ETL) in n-i-p perovskite solar cells. However, the heterogeneous surface chemistry and process-dependent film formation complicate control over buried interfaces and absorber crystallization. Here we report phthalimide-based electron-selective self-assembled monolayers (SAMs) that replace conventional SnO2 contacts. The methoxy oxygen in ETL-OMe coordinated with PbI2-derived precursors, increasing the apparent activation energy for second-step phase conversion and delaying crystallization. Building on this molecular design, we constructed a dimeric SAM architecture, ETL-2PA, that substantially strengthened substrate attachment, improved resistance to solvent and thermal stress, and further regulated precursor conversion, yielding perovskite films with enhanced crystalline order, compact buried interfaces and reduced non-radiative recombination. ETL-2PA-based devices achieved the champion power conversion efficiency (PCE) of 26.79% and an independently certified efficiency of 26.5%, establishing a benchmark for n-i-p devices with organic ETLs. Unencapsulated devices remained ~95% of the initial PCE after 2500 h of continuous maximum-power-point operation, while encapsulated devices retained ~90% after 1350 h of damp-heat aging at 85 °C and 85% relative humidity and after 400 thermal cycles between -40 ~ 80 °C. These results established electron-selective molecular contacts as chemically active regulators of perovskite formation.
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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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