Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Lead-based perovskites have attracted considerable attention for surface-enhanced Raman scattering (SERS) applications owing to their tunable band structures and favorable optoelectronic properties. However, their intrinsic toxicity and associated environmental concerns remain major barriers to practical implementation. To address these challenges, we present lead-free cesium bismuth halide perovskite/Ag hybrid SERS substrates prepared by thermal co-evaporation of CsBr and BiI3 followed by Ag deposition.
To achieve comparable SERS performance with a more controllable architecture, we developed bilayer structures and systematically tuned their layer thickness ratio and stacking sequence. The incorporation of the lead-free perovskite layer is expected to establish favorable energy-level alignment and facilitate interfacial charge-transfer interactions between the substrate and adsorbed molecules. Such interactions can contribute additional chemical enhancement (CM), which, together with the localized electromagnetic enhancement (EM) originating from Ag nanostructures, leads to amplified Raman responses of target analytes, enabling highly sensitive molecular detection. Rhodamine 6G (R6G) was employed as a probe molecule to evaluate SERS performance. Compared with bare Ag substrates, the lead-free perovskite/Ag substrate exhibited significantly enhanced Raman signals at characteristic peaks of 612, 774, 1362, and 1650 cm-1. Concentration-dependent measurements revealed a limit of detection (LOD) down to 10-7 M. Beyond R6G, the perovskite interlayer extended detection to Thiabendazole (TBZ), which shows no signal on bare Ag, down to 10-7 M. These findings highlight all-vacuum-deposited lead-free perovskite films as scalable, environmentally friendly, charge-transfer-assisted SERS platforms, and show that a rationally designed bilayer can match co-evaporated films while offering precise control for high-sensitivity molecular sensing.
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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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