

- Warsaw-4-PhD School
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Institute Thursday Seminar![]() Materials for energy harvesting are recently intensively studied due to the increasing need to substitute fossil fuels. They enable reusing of waste energy directly gained from the environment and convert it to electricity. One of the promising candidates for thermogenerators is Al-doped ZnO (AZO). Thermoelectric properties of this material can be tuned not only with Al doping level but also by its structure. More on this subject will be presented by Prof. Paolo Mele from College of Engineering, Shibaura Institute of Technology (Japan) at the coming UNIPRESS Seminar on Wednesday October 18, 2023 at 14:00. We invite you to his talk entitled „Nanoengineered Al-doped ZnO thin films for thermoelectric applications”. The seminar will be held in hybrid mode – in person at the Institute of High Pressure Physics PAS at Prymasa Tysiąclecia 98 (seminar room, second floor), and on-line through Zoom platform. Invited talk on E-MRS Fall Meeting![]() Dr hab. inż. Julita Smalc-Koziorowska from the Laboratory of Semiconductor Characterization will give an invited talk on E-MRS Fall Meeting next week. The talk is entitled „The role of metal vacancies in thermal degradation of InGaN” and is a part of Symposium U "Defect-induced effects in low-dimensional and novel materials" on September 18, 2023. The 2023 Fall Meeting of the European Materials Research Society (E-MRS) will take place from September 18 to 21, 2023 at the main campus of the University of Technology in Warsaw (Poland) and will consist of 24 parallel symposia with invited speakers, oral and poster presentations assorted by one plenary session to provide an international forum for discussing recent advances in the field of materials science. Polish-Taiwanese seminar on semiconductors![]() National Center for Research and Development (NCBiR), Poland and the National Science and Technology Council (NSTC), Taiwan are organizing a scientific seminar under a scientific cooperation agreement. This is a 10th seminar in the series and it will be devoted to semiconductor technologies. Prof. Izabella Grzegory from the Institute of High Pressure Physics Polish Academy of Sciences has been invited to be the Polish coordinator of the 10th Polish-Taiwanese seminar. The substantive coordinators on the Taiwanese side are Dr. Mei-Yu Chang, Director of NARLabs International Affairs Office, and Dr. Chang-Hong Shen, Deputy Director of TSRI (Taiwan Semiconductor Research Institute). The seminar will be held on November 6, 2023 at the National Applied Research Laboratories (NARLabs) in Hsinchu, Taiwan. More details to follow soon. Theory and Machine Learning for Crystal Growth![]() New lecture on crystal growth theory and application of machine learning for advanced modeling of crystal growth processes of semiconductor bulk crystals and epitaxial layers will be given within the scope of the physics courses in spring semester of Warsaw4PhD School. The 8-lecture course will be given on-line by dr Akira KUSABA from Kyushu University. The first lecture will be given on April 18th 2023 at 10.00 am. Visit the Warsaw4PhD webpage to find out more about the scope of the new course and get the Zoom meeting link. |
Jean-Louis Robert![]() With great sorrow, we announce the passing away of Jean-Louis Robert, retired professor of physics at the University of Montpellier and our longtime Friend, on September 7th. Professor Robert's professional career was closely associated with research on semiconductor materials, ranging from fundamental studies to practical applications. The close connection between research and applications was of particular importance to Professor Robert and led to the practical utilization of the results of the basic research in the industry. Holy Mass for the deceased prof. Robert will be celebrated on September 29, 2023 at 3:00 p.m. in the church of St. Wojciech in Wola Recent ambient and high-pressure studies of iron-based superconductors by UNIPRESS (Editor's Choice)![]() The research team of Dr. Singh from NL-6 Laboratory of Superconductors has recently published two interesting publications on iron-based superconductors (FBS); both in an open access journal Materials (Impact factor 3.4). In the first paper, the effect of cometal addition has been studied and reported for FBS at ambient pressure, where the enhancement of the superconducting transition (Tc) and critical current (Jc) properties were observed due to the improvement of the intergrain connections and pinning centres. This paper is published by M. Manasa, M. Azam, T. Zajarniuk, R. Diduszko, T. Cetner, A. Morawski, A. Wiśniewski, and Shiv J. Singh entitled “Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe0.5Te0.5” (Materials 16, 2892 (2023) https://doi.org/10.3390/ma16072892). In the second work, optimization of Fe(Se,Te) physical properties was carried out utilizing the high gas pressure and high-temperature approach (HP-HTS). In comparison to the ambient pressure approach, HP-HTS under optimal growth conditions significantly improved the critical current density, the pinning properties, and the transition temperature. This study demonstrates that the high-pressure synthesis method can be a novel approach to studying FBS materials in order to improve sample quality, achieve further superconducting property enhancements, and advance the development of their magnetic applications, particularly for superconducting wires and tapes. This paper is published by M. Azam, M. Manasa, T. Zajarniuk, R. Diduszko, T. Cetner, A. Morawski, J. Więckowski, A. Wiśniewski, and Shiv J. Singh entitled “High-Pressure Synthesis and the Enhancement of the Superconducting Properties of FeSe0.5Te0.5” (Materials 16, 5358 (2023) https://doi.org/10.3390/ma16155358). Note that this is EDITOR's CHOICE ARTICLE, selected by Editors to be particularly interesting to readers and important in the respective research area. Fig. The variation of hexagonal phase (H), room temperature resistivity (ρ300K), Residual resistivity ratio (RRR), the onset transition temperature (Tconset), transition width (ΔT) and critical current density (Jc) with synthesis pressure. New European project „Neuromorphic Polariton Accelerator” (PolArt)![]() MBE Laboratory will collaborate with Warsaw University on the Horizon Europe Pathfinder project “Neuromorphic Polariton Accelerator”, acronym: PolArt. The goal of the project, leaded by prof. Barbara Piętka, is to demonstrate a new way to build artificial intelligence-dedicated circuits using polariton neural networks as optical accelerators. Prof. Czesław Skierbiszewski team will be focused on the design, fabrication and integration of the micro-LEDs and their arrays, that are the key elements to inject and modulate the signal in the waveguides. The project aims to build a network that performs binary operations based on polariton microcavities. The basic element that enables effective binary operations are semiconductor microcavities. Strong coupling of the microcavity modes with excitons result in gigantic nonlinearities that are required for efficient calculations. The fact that polaritons operating room temperature was recently demonstrated, promises to have a real impact on the technologies of the future. Research units involved in the project have recently shown that this state of matter is extremely interesting in terms of speed and efficiency when used to implement artificial neural networks. Thanks to this new concept device, complex applications related to neural-like processing, will be efficiently implemented, therefore enabling neuromorphic computation to be done in small devices that cannot rely on remote, large bandwidth connection. This proposal benefits from the contribution of several complementary partners coming from many different research areas (material science, physics, optics, chemistry, genetics) and industrial participants that assure the interdisciplinarity and technological oriented target. Fig. (a) Scheme of XOR gate based on polariton microcavity (after R. Mirek et al. Nano Letters, 21, 37152021, 2021). (b) Scheme of the polaritonic neuromorphic accelerator designed for room temperature operation with perovskite waveguides with signal modulated by μ-LEDs arranged into arrays. |
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