Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Perovskite semiconductors have gained widespread attention for their excellent optoelectronic properties, however their unsatisfactory stability has shifted scientific interest toward exploring novel, perovskite-inspired compositions. One of these class of materials is ternary copper halides (TCHs). The exchange of lead (Pb2+) to copper (Cu+) results in increased stability under ambient conditions, and alters the materials photophysical properties Compared to conventional perovskites, their emission mechanism changes due to lattice distortion and reduced crystal and electronic dimensionality. Consequently, self-trapped excitonic (STE) emission dominates the recombination pathway. As a result, these materials exhibit a large Stokes shift, increased exciton binding energies, high photoluminescence quantum yield, and negligible self-absorption, making them attractive for optoelectronic applications such as photodetectors, LEDs, X-ray detectors, and ionizing radiation detectors.
Because of the composition tunable properties of TCHs the number of emerging structures are fast growing. While the exchange of the “A” site cation results often in different crystal structure, the halide content (such as Cl-, Br-, I-) mainly affects the valance band positions. To fully exploit these materials, understanding how a mixed-halide composition (Cs3Cu2IxBr5−x) influences band structure, defect states, and the resulting optoelectronic properties is highly critical in terms of device performance. In the case of scintillators, this property offers a flexible framework for optimization.
In this work, we systematically investigated the effect of halide (Br- and I-) composition on the structural and luminescent properties of Cs3Cu2IxBr5−x thin films, synthesized by spray coating method. Our investigations include the determination of crystal structure, elemental composition, band structure and defect chemistry with the photoluminescence characteristics, quantum yields, and the radioluminescent light yield under alpha-particle irradiation to highlight the potential of these thin films as radiation detectors.
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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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