Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
The radiation hardness of the material inherently limits the detection of ionizing radiation with solid materials. Halide Perovskites, hailed as promising scintillator material, have demonstrated self-healing capabilities[1],[ 2], potentially circumventing this pitfall. Moreover, the presence of high-Z elements (e.g., Cs, Pb, and Br/I), unity light yield, fast decay time, tunable band gap, solution processability, inexpensive raw materials, and manageable growth condition mark them relevant for implementation in scintillator industry.
Here, we studied the room temperature radioluminescence properties of mixed cation compositions of lead halide perovskite thin films. These include inorganic (Cs) or organic monovalent focusing on Acetamidinium (AA) as cation substituents, which is not commonly used. Acetamidinium cations substituted Lead halide perovskite presents high power conversion efficiency in Perovskite solar cells and can serve as excellent emitters by analogy due to lesser non-radiative recombination [3].
The Acetamidinium mixed cations sample tested shows an order of magnitude higher radioluminescence signals than CH3NH3PbI3. For the first time, we show the radiation tolerance and damage recovery capability of encapsulated samples of scintillators of new compositions, particularly AA substitution in CH3NH3PbI3. We emphasize that our measurements are conducted at room temperature and are relevant for translation to real-life detectors. The data is acquired by monitoring changes in the intensity of radio luminescence signal under long X-ray radiation exposure. The sample encapsulated with Kapton tape and epoxy glue at the edges was exposed to X-ray irradiation for an hour, which resulted in ~25% reduction of radioluminescence intensity (Fig. 1). Further, the X-ray source was off; the next measurement was recorded after many minutes of recovery time, and we found nearly 100% recovery of radioluminescence intensity. This shows its potential as a sustainable scintillating material.
The employment of Acetamidinium cation in scintillation is novel and makes a big difference in the efficiency and recovery of the scintillators, which is the basic building block for an efficient high-energy detector. Moreover, using IR-emitting scintillators further reduces the energetic strain on the optical components, which are typically engineered for UV emission. We argue that low-energy light is beneficial for long-lasting devices, but further proof of this point is planned in future studies.
References:
(1) Khalfin, S.; Veber, N.; Dror, S.; Shechter, R.; Shaek, S.; Levy, S.; Kauffmann, Y.; Klinger, L.; Rabkin, E.; Bekenstein, Y. Self-Healing of Crystal Voids in Double Perovskite Nanocrystals Is Related to Surface Passivation. Adv. Funct. Mater. 2022, 32 (15), 2110421.
(2) Singh, P.; Soffer, Y.; Ceratti, D. R.; Elbaum, M.; Oron, D.; Hodes, G.; Cahen, D. A-Site Cation Dependence of Self-Healing in Polycrystalline APbI3 Perovskite Films. ACS Energy Lett. 2023, 8 (5), 2447–2455.
(3) Singh, P.; Mukherjee, R.; Avasthi, S. Acetamidinium-Substituted Methylammonium Lead Iodide Perovskite Solar Cells with Higher Open-Circuit Voltage and Improved Intrinsic Stability. ACS Appl. Mater. Interfaces 2020, 12 (12), 13982–13987.
The project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no: 949682-ERC-Heteroplates. PS gratefully acknowledges financial support from Nancy and Stephen Grand Technion Energy Program.
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.