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Enhanced absorption of solar cell made of photonic crystal by geometrical .design

Frontiers of Optoelectronics 2016年第1期9卷 93-98页

作者： Asma OUANOUGHI Abdesselam HOCINI Djamel KHEDROUCHE laboratoire d'Analyse des signaux et systemes Department of Electronics University of Mohamed Boudiaf of M'sila BE 166 Route Ichebilia M'sila 28000 Algeri

In this paper, via numerical simulation we designed the geometry of solar cell made by onedimensional （1D） and two-dimensional （2D） photonic crystals with two kinds of materiel （silicon （Si） and hydrogenated amorphous silicon （a-Si：H）） in order to enhance its absorption. The absorption characteristics of light in the solar cell structures are simulated by using finite-difference time-domain （FDTD） method. The calculation results show that the enhancement of absorption in patterned structure is apparent comparing to the unpatterned one, which proves the ability of the structure to produce photonic crystal solar cell. We found solar cell geometries as a 2D photonic crystal enable to increase the absorption between 380 and 750 nm.

关键词： finite-difference time-domain two-dimensional (2D) photonic crystals solar cell

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Accurate surface potential determination in Schottky diodes by the use of a correlated current and capacitance voltage *** to n-InP

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Journal of Semiconductors 2011年第10期32卷 39-43页

作者： Ali Ahaitouf Abdelaziz Ahaitouf Jean Paul Salvestrini Hussein Srour laboratoire signaux systemes et composants DGE Faculty of Sciences and TechnologyUniversite Sidi Mohammed Ben AbdellahP.O.Box 2202FES Morocco LIMAO Faculte polydisciplinaire de Taza Universite Sidi Mohammed Ben Abdellah de FesBP 1223 Taza-GareMorocco laboratoire Materiaux Optiques Photonique et SystemesEA 4423Universite Paul Verlaine-MetzSupelec2 rue E.Belin57070 MetzFrance

Based on current voltage（I-Vg） and capacitance voltage（C-Vg） measurements,a reliable procedure is proposed to determine the effective surface potential Vd（Vg） in Schottky *** the framework of thermionic emission,our analysis includes both the effect of the series resistance and the ideality factor,even voltage dependent. This technique is applied to n-type indium phosphide（n-InP） Schottky diodes with and without an interfacial layer and allows us to provide an interpretation of the observed peak on the C-Vg *** study clearly shows that the depletion width and the flat band barrier height deduced from C-Vg,which are important parameters directly related to the surface potential in the semiconductor,should be estimated within our approach to obtain more reliable information.

关键词： Schottky diode interface states surface potential ideality factor barrier height capacitance voltage current measurements

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Effects of realistic reradiation models in digital reconfigurable intelligent surfaces

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Journal of Information and Intelligence 2023年第3期1卷 238-252页

作者： Marco Di Renzo Abdelhamed Mohamed Alessio Zappone Gabriele Gradoni Marco Rossi Massimo Moccia Giuseppe Castaldi Vincenzo Galdi Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes3 Rue Joliot-CurieGif-sur-Yvette 91192France University of Cassino and Lazio Meridionale Department of Electrical and Information EngineeringVia Gaetano Di Biasio 43Cassino(FR)03043Italy University of Nottingham School of Mathematical Sciences and Department of Electrical and Electronics EngineeringUniversity ParkNottingham NG72RDUK dUniversity of Cambridge Department of Computer Science and Technology15 J.J.Thomson AvenueCambridge CB30FDUK University of Sannio Department of EngineeringCorso Garibaldi 107Benevento 82100Italy

Reconfigurable intelligent surfaces(RISs)are a promising technology for wireless communication applications,but their performance is often optimized using simplified electromagnetic reradiation *** this study,we explore the impact on the RIS performance of more realistic assumptions,including the(possibly imperfect)quantization of the reflection coefficients,subwavelength inter-element spacing,near-field location,and presence of electromagnetic *** find that design constraints can cause an RIS to reradiate power in unwanted ***,it is important to optimize an RIS by considering the entire reradiation ***,our study indicates that a 2-bit digitally controllable RIS with a nearly constant reflection amplitude and RIS elements with a size and inter-element spacing between(1/8)th and(1/4)th of the signal wavelength may offer a reasonable tradeoff between performance,complexity,and cost.

关键词： Wireless communications Reconfigurable intelligent surfaces Dynamic metasurfaces Modeling Performance evaluation Optimization

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Wireless communications empowered by reconfigurable intelligent surfaces: Model-based vs model-free channel estimation

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Journal of Information and Intelligence 2023年第3期1卷 253-266页

作者： Li Wei Chongwen Huang George C.Alexandropoulos Ahmet M.Elbir Zhaohui Yang Zhaoyang Zhang Marco Di Renzo Merouane Debbah Chau Yuen Engineering Product Development Pillar Singapore University of Technology and DesignSingapore 487372Singapore College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Department of Informatics and Telecommunications National and Kapodistrian University of Athens15784 AthensGreece Interdisciplinary Centre for Security Reliability and TrustUniversity of LuxembourgL-4365 Esch-sur-AlzetteLuxembourgand Duzce UniversityDuzce 81620Turkey Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes91192France Khalifa University of Science and Technology Abu DhabiUnited Arab Emirates School of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore 639798Singapore

Reconfigurable intelligent surfaces(RISs)are lately being attractive for their great potential in future sixth generation wireless communications(6G),which is attributed to their affordable energy consumption and easy ***,the large numbers of low-cost reflecting elements comprising RISs impose challenges for channel acquisition in various RIS-based wireless applications,such as RIS-enhanced orthogonal frequency-division multiplexing and multi-user multipleinput multiple-output *** this article,we first overview the state-of-the-art RIS hardware architectures designed to assist channel estimation for RIS-empowered wireless communication *** also overview existing channel estimation approaches,which are categorized into model-based and model-free techniques,and discuss their advantages and limitations depending on the RIS *** challenges with RIS-empowered systems in terms of hardware and other parameter limitations are presented,together with future research directions for channel estimation in RIS-based wireless systems,such as RISs with extremely large numbers of elements,multi-hop communications with RISs,and frequency division duplexing for high mobility systems.

关键词： Reconfigurable intelligent surfaces Channel estimation Model-based methods Model-free methods

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