The development of high-performance, low-cost scintillators is an important area of research due to their wide application in medical imaging, homeland security, high-energy physics, industrial control, oil drilling explorations, and energy management.[1] The cost and inherent properties of traditional scintillators based on inorganic semiconductors, are their limitations. Low-temperature...
Latest advancements in the field of ionizing radiation detection have been achieved through the application of lead halide perovskites. These organic-inorganic hybrid structures combine low-cost fabrication processes, the scalability and flexibility with desirable intrinsic properties: high stopping power, defect-tolerance, large mobility-lifetime (μτ) product, tunable bandgap and simple...
The fabrication of perovskite-polymer composites offers improved stability in perovskite radiation detectors alongside properties such as flexibility or improved strength. The facile production of all-inorganic perovskite nanocrystals is a convenient and cost-effective source of radiation detecting material. Incorporating these nanocrystals into the thermoplastic filaments used for fused...
In recent years, all-inorganic double perovskites have gained significant interest as promising candidates for a wide range of optoelectronic applications, particularly in the field of radiation detection. Cs2AgBiBr6, a double perovskite with a low toxicity profile and high chemical stability, has attracted substantial attention due to its potential for enhanced radiation detection performance...
This research project investigates the performance of perovskite films and their suitability for use as radiation detectors, either as semiconductors or scintillators. We are particularly interested in films that are 10-100 µm thick, fabricated using various deposition methods.
Using the method of physical vapor deposition, FAPbBr3 films were produced atop a substrate. Photoluminescence...
Halide perovskites one of the most promising materials for next-generation, highly sensitive, low-noise, direct high energy X-ray detectors due to their excellent optoelectronic properties including bandgap tunability, high photoluminescence quantum yields (PLQY), defect tolerance and chemical versatility. However, challenges for the successful commercialization of halide perovskites X-ray...
In this study, we have investigated the impact of ligand-assisted Inverse Temperature Crystallisation (ITC) growth of FAPbBr3 perovskite single crystals on X-ray sensitivity and the charge transport properties. The ligand 3-(Declydimethylammonio)-propane-sulfonate inner salt (DPSI) was used to synthesise these perovskite single crystals from solution and the initial impact of the ligand on the...
During the measurement of the hole photocurrent relaxations (illuminated anode), we noticed an unusually high current after the bias polarity was switched. Our setup was designed to suppress the majority of effects tied to parasitic capacitances and is expected to have RC=100ns-1μs depending on the capacitance of the sample. The majority of the observed effects on a scale of 10s of μs,...
In this study, we analyse the performance of polycrystalline pellets of FAPbBr3 as a semiconductor-based radiation detector, and study the impact of lead acetate (LA) on the FAPbBr3 X-ray detector performance. Using a hot-pressing method various FAPbBr3 pellets were fabricated with different concentrations of lead acetate to investigate the improvement in the pellet microstructure and X-ray...
Metal halide perovskite is a new semiconductor family with great potential in various applications such as X/γ-ray detectors, solar cells, light emission diodes, and lasers. Especially inorganic metal halide perovskites, such as e.g. CsPbI3 or CsPbBr3 feature high atomic numbers (ZCs = 55, ZPb = 82, ZBr = 35, and ZI = 53), an...
Scintillators are versatile indirect-type detectors finding applications in many strategic fields such as nuclear medicine, imaging, high energy physics, and homeland security. Given the outstanding photophysical properties of Metal Halide Perovskite (MHPs) along with the successful application in disparate optoelectronic devices, their use as scintillator detectors is emerging with very...
2D perovskite thin films have attracted significant attention for their potential use as high-performance detectors due to their unique optical and electronic properties. These materials crystallize in a natural self-assembled quantum well-like structure and possess several interesting features, including synthesis at relatively low temperatures (below 100°C) and low defect density.1...
Photoconductive gain is a physical phenomenon typical of photoconductors, where a highly defective semiconducting photoactive material is between two ohmic contacts. Such trappingactivated mechanism amplifies the high energy radiation-induced current by a factor G, leading to e quantum efficiency exceeding 100% and providing high sensitivity to the radiation. It occurs when...
The ability to detect ionising radiation is crucial to many areas of modern-day life spanning use in medical imaging, cancer therapies, security, and environmental monitoring as well as potential in military field applications. Indirect detectors, also known as scintillators, operate by absorbing high energy X-rays then converting into lower energy photons that emit in the UV/Visible region....
X-ray direct detectors based on hybrid organic/inorganic lead-halide perovskite (HOIP) have gained significant attention from the research community over the last decade. In this context, the research has focused on identifying the optimal perovskite material. Among the HOIPs, 3D perovskites have demonstrated very good performances as X-rays detectors, but they are limited by high trap states...
