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Newsletter No. 08 October 2020 GaN Technology for GANEXT Optoelectronics & Electronics Coordinated by CRHEA-CNRS research laboratory, this monthly newsletter is produced by Knowmade in collaboration with the managers of GANEXT groups. The newsletter presents a selection of newest scientific publications, patent applications and press releases related to Optoelectronics (LED, micro-LED, laser, photonics, etc.) and Electronics (Power, RF, advanced electronics, etc.) based on III-Nitride semiconductors (GaN, AlN, InN and alloys). All issues on www.ganex.fr in Veille section. Free subscription http://www.knowmade.com/ganex GANEXT Cluster of Excellence (Labex, 2020-2024) GANEXT is a cluster gathering French research teams involved in GaN technology. The objective of GANEXT is to strengthen the position of French academic players in terms of knowledge and visibility, and reinforce the French industrial players in terms of know-how and market share. GANEXT replaces and succeed GANEX Cluster of Excellence (Labex 2012-2019). www.ganex.fr Knowmade is a Technology Intelligence and IP Strategy consulting company specialized in analysis of patents and scientific information. The company helps innovative companies and R&D organizations to understand their competitive landscape, follow technology trends, and find out opportunities and threats in terms of technology and patents. Knowmade’s analysts combine their strong technology expertise and in-depth knowledge of patents with powerful analytics tools and methodologies to turn patents and scientific information into business-oriented report for decision makers working in R&D, Innovation Strategy, Intellectual Property, and Marketing. Our experts provide prior art search, patent landscape analysis, scientific literature analysis, patent valuation, IP due diligence and freedom-to-operate analysis. In parallel the company proposes litigation/licensing support, technology scouting and IP/technology watch service. Knowmade has a solid expertise in Compound Semiconductors, Power Electronics, Batteries, RF Technologies & Wireless Communications, Solid-State Lighting & Display, Photonics, Memories, MEMS & Solid-State Sensors/Actuators, Semiconductor Manufacturing, Packaging & Assembly, Medical Devices, Medical Imaging, Microfluidics, Biotechnology, Pharmaceutics, and Agri-Food. www.knowmade.com IMPORTANT NOTE: The end of GaNeX Cluster of Excellence program (Labex 2012-2019) was scheduled on December 2019. However, the French government decided to expand the labex program for five additional years, in order to further strengthen the synergy between French academic research organizations and industrial players in the field of GaN optoelectronics and electronics. Therefore, GANEXT Cluster of Excellence program will replace and succeed GaNeX for the next five years (2020-2024). Accordingly, the GANEXT newsletter will follow and adapt to the new program, focusing on scientific publications, patent applications and press releases related to optoelectronics (LED, µ-LED, laser, photonics, etc.) and electronics (power, RF, advanced electronics, etc.), ruling out publications which are not related to one of these two families of applications. For instance, publications dealing with MEMS, sensors, photovoltaics, nanostructures, semi-polar and non-polar materials, fundamental physics, etc. that do not obviously relate to optoelectronic or electronic applications will not be included in the GANEXT newsletter. Besides, a panel of GANEXT experts will continue to interact with Knowmade team in order to select the most relevant publications of the month, consistently with GANEXT’s ongoing projects. TABLE OF CONTENTS METHODOLOGY ........................................................................................................... 3 SCIENTIFIC PUBLICATIONS............................................................................................ 4 OPTOELECTRONICS ....................................................................................................... 4 ELECTRONICS .............................................................................................................. 19 PRESS RELEASE........................................................................................................... 36 PATENT APPLICATIONS .............................................................................................. 58 GANEXT | GaN Technology for Optoelectronics & Electronics Newsletter No. 08 | 2 Powered by METHODOLOGY GANEXT | GaN Technology for Optoelectronics & Electronics Newsletter No. 08 | 3 Powered by SCIENTIFIC PUBLICATIONS Selection of new scientific articles OPTOELECTRONICS Group leader: Bruno Gayral (CEA) Information selected by Julien Brault (CNRS-CRHEA), Maria Tchernycheva (CNRS-C2N) and Thierry Guillet (CNRS-L2C) Calculation of optical gain in AlGaN quantum wells was studied via photoluminescence (PL) and time- for ultraviolet emission resolved PL (TRPL) spectroscopy. The probability ratio Department of Electrical Engineering and CINSaT, University of the capture of excitons by nonradiative of Kassel, Wilhelmshöher Allee 71, 34121 Kassel, Germany recombination centers (NRCs) and the radiative Technische Universität Berlin, Institute of Solid State recombination of excitons was evaluated individually Physics, Hardenbergstr. 36, EW6-1, 10623 Berlin, Germany via two different experimental analyses. The IQE was evaluated via temperature- and excitation power AIP Advances density-dependent PL measurements and its https://doi.org/10.1063/5.0021890 dependence on excitation density was analyzed using Stimulated emission from AlGaN based quantum wells a rate equation model based on the radiative and (QWs) emitting at ultraviolet wavelengths is nonradiative recombination of excitons. Moreover, investigated theoretically. Maxwell–Bloch equations the radiative and nonradiative recombination in the second Born approximation are solved self- lifetimes were evaluated via temperature-dependent consistently with the Poisson equation. The valence TRPL measurements; furthermore, they were band dispersion is obtained from a 6-band kp-model. analyzed as functions of temperature and excitation For a QW emitting at around 270 nm with a thickness energy density. The probability ratios obtained from of 2.2 nm, an estimated FWHM of 10 meV for the two individual analyses were in agreement. This homogeneous broadening and an excitonic red shift of quantitative agreement indicated that the analysis 100 meV are extracted under typical laser conditions. based on the radiative and nonradiative From a comparison to experimental data of stimulated recombination processes of excitons, which included emission, an inhomogeneous broadening energy of 39 the process of filling NRCs, was valid for AlGaN-based meV FWHM is evaluated. Calculations show that high UV-A MQWs. TE gain can be achieved for thin QWs around 2 nm thickness in a multiple QW arrangement or for single GaN-based high response frequency and high optical QWs thicker than 6 nm. power matrix micro-LED for visible light communication Correlation between excitons recombination Guangdong Polytechnic Normal University, Guangzhou 510665, China dynamics and internal quantum efficiency of AlGaN- Guangzhou Sonostar Technology Co., Ltd, Guangzhou based UV-A multiple quantum wells 510665, China Department of Electrical and Electronic Engineering, Institute of the Opto-Electronic Materials and Technology, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi South China Normal University, Guangzhou 510631, China 755-8611, Japan Department of Computer Science and Electronic IEEE Electron Device Letters Engineering, National Institute of Technology, Tokuyama https://doi.org/10.1109/LED.2020.3021282 College, Gakuendai, Shunan, Yamaguchi 745-8585, Japan RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan Light-emitting diodes (LEDs) with high response frequency and high power can be applied in visible Journal of Applied Physics https://doi.org/10.1063/5.0015554 light communication (VLC). This paper studies the response frequency and optical output power of the The correlation between the recombination dynamics gallium nitride (GaN) based matrix micro-LED (μLED) of excitons and the internal quantum efficiency (IQE) for visible light communication. The blue-emitting of AlGaN-based UV-A multiple quantum wells (MQWs) GaN μLEDs with the format from 1×1 to 6×6 are GANEXT | GaN Technology for Optoelectronics & Electronics Newsletter No. 08 | 4 Powered by fabricated and used to analyze the relationship Fabrication of gallium nitride and nitrogen doped between the matrix format and the response single layer graphene hybrid heterostructures for frequency, as well as the output optical power and the high performance photodetectors data transmission performance of the matrix μLED. Department of Electronics and Communication The experimental and analysis results show that the Engineering, Koneru Lakshmaiah Education Foundation, GaN-based matrix μLED response frequency can be Hyderabad, 500 075, Telangana, India improved by an increase in the injection current Crystal Growth Centre, Anna University, Tamil Nadu, Chennai, 600 025, India density increased and a decrease in device Key Laboratory for Micro-Nano Physics and Technology of capacitance. The experimental comparison result Hunan Province, College of Materials Science and indicates that the −3 dB response frequency changed Engineering, Hunan University, Changsha, 410 082, People’s from 85 MHz to 401 MHz at a 60 mA injection current
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