Publication date: 15th December 2025
Alpha (α) phase halide perovskite thin films have been extensively applied as active layers in optoelectronic devices due to their unique photophysical properties. Moreover, halide perovskites can also exist in a less photoactive but more stable delta (δ) phase in ambient. Despite its limitations, the promises of the δ phase perovskite in enhancing device performance and stability have been recently highlighted, provoking the need for a deeper understanding of its properties. In this work, we explore the effects of the photophysical and structural properties of δ phase triple-cation mixed-halide perovskite (Cs0.05FA0.81MA0.14)Pb(I0.85Br0.15)3 (δ-PVK) on the performance of ZnO-based ultraviolet (UV) photodetector by modifying the ZnO active layer surface with a thin layer of δ PVK via spin-coating. This strategy yields a ZnO/δ-PVK bilayer-based UV photodetector with improved performance due to the enhanced inter-layer charge transfer form δ-PVK to ZnO. The ZnO/δ-PVK bilayer device yields a photocurrent (Iph) ca. 3 times greater than that of the ZnO single layer device and ca. 2 orders of magnitude greater than that of the ZnO/αPVK bilayer device. In the same vein, the ZnO/δ-PVK bilayer device shows the highest; on-to-off current (Ion/Ioff) ratio (105.5), photoresponsivity (R, 3.17 A/W), photodetectivity (D, 2.2 × 1011 Jones) and photoconductive gain (G, 10.1) under 391nm UV light irradiation and 21.42 mW/cm2 light intensity at 1V bias. This work advances the usefulness of the δ phase perovskite hitherto disregarded in optoelectronic device fabrication.
We acknowledge the support from Engineering and Physical Sciences Research Council (EPSRC) within the United Kingdom Research and Innovation (UKRI). Grant reference: EP/Z002907/1.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.