Applied sciences

Opto-Electronics Review

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Opto-Electronics Review | 2024 | 32 | 1

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Abstract

Growing energy demands are expected to render existing energy resources insufficient. Solar energy faces challenges in terms of providing continuous and reliable power supply to consumers. However, it has become increasingly important to implement renewable energy (RE) and energy management (EM) systems to increase the supply of power, improve efficiency, and maintain the stability of energy systems. As such, this present study integrated energy storage (ES) devices; namely, batteries and direct current (DC) to DC converters; into energy systems that support battery operation and effectively manage power flow, especially during peak load demands. The proposed system also addresses low solar irradiation and sudden load change scenarios by enabling the battery to operate in a discharge state to supply power to the load. Conversely, when the demand matches or exceeds the available solar energy, the battery is charged using solar power. The proposed system highlights the significance of RE systems and EM strategies in meeting growing energy demands and ensuring a reliable supply of power during solar variability and fluctuating loads. A MATLAB® Simulink model was used to evaluate the integration of a 200 kW photovoltaic (PV) array with a 380 V grid and 150 kW battery. The loads, consisting of a 100 kW and a 150 kW unit, were parallel connected. The results indicated that boost and three-phase (3Ph) inverters can be used to successfully integrate PV systems to the power grid to supply alternating current (AC) power. The inclusion of a battery also addressed power shortages during periods of insufficient power generation and to store surplus power.
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Authors and Affiliations

Baqer Saleh Mahdi
1
Nasri Sulaiman
1
ORCID: ORCID
Mohanad Abd Shehab
2
Siti Lailatul Mohd Hassan
3
Suhaidi Shafie
1
ORCID: ORCID
Hashim Hizam
1
ORCID: ORCID

  1. Department of Electrical and Electronic Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia
  2. Electrical Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq
  3. School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
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Abstract

A graphene/NPB structure with Re2O7 as an interfacial layer in the context of its potential use in the design of an organic light-emitting diode (OLED) is investigated. The X-ray photoelectron spectroscopy (XPS) study shows the formation of the Re2O7 phase on a monolayer graphene on quartz during thermal deposition in ultra-high vacuum (UHV). The ultraviolet photoelectron spectroscopy (UPS) study shows an enhancement of the work function of the graphene heterostructure after deposition of the Re2O7 layer up to 5.4 eV. The hole injection barrier between the Re2O7/graphene heterostructure and the N-bis-(1-naphthyl)-N,N-diphenyl-(1,1-biphenyl)-4,4-diamine (NPB) layer was estimated to be 0.35 eV, which is very promising for a good OLED performance.
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Authors and Affiliations

Paweł Krukowski
1
ORCID: ORCID
Michał Piskorski
1
ORCID: ORCID
Maciej Rogala
1
ORCID: ORCID
Paweł Dąbrowski
1
ORCID: ORCID
Iaroslav Lutsyk
1
ORCID: ORCID
Witold Kozłowski
1
ORCID: ORCID
Dorota A. Kowalczyk
1
ORCID: ORCID
Patryk Krempiński
1
ORCID: ORCID
Maxime Le Ster
1
ORCID: ORCID
Aleksandra Nadolska
1
ORCID: ORCID
Klaudia Toczek
1
ORCID: ORCID
Przemysław Przybysz
1
ORCID: ORCID
Rafał Dunal
2
ORCID: ORCID
Wojciech Ryś
1
ORCID: ORCID
Shankhanil Sarkar
3
ORCID: ORCID
Beata Łuszczyńska
4
ORCID: ORCID
Paweł J. Kowalczyk
1
ORCID: ORCID

  1. Department of Solid State Physics (member of National Photovoltaic Laboratory, Poland), Faculty of Physics and Applied Informatics, University of Lodz, ul. Pomorska 149/153, 90-236 Łódź, Poland
  2. Department of Solid State Physics (member of National Photovoltaic Laboratory, Poland), Faculty of Physics and Applied Informatics, University of Lodz, 149/153 Pomorska St., 90–236 Łódź, Poland
  3. Department of Physics, University of Kalyani, Kalyani-741235, Nadia, West Bengal, India
  4. Department of Molecular Physics (member of National Photovoltaic Laboratory, Poland), Lodz University of Technology, ul. Żeromskiego 116, 90-924 Łódź, Poland
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Abstract

Underwater wireless optical communication is the best alternative for many applications especially for high bandwidth data communication between underwater objects and vehicles. The implementation of coding scheme along with advanced modulation technique and equalisation methods is identified as a key research scope for enhancing the performance of the system. In this paper, the coded generalised frequency division multiplexing (GFDM) technology is employed to provide high-data rates and less out-of-band emission. The Bose-Chaudhuri-Hocquenghem (BCH) and Reed-Solomon (RS) coding schemes along with equalisation techniques namely normalised least mean square (NLMS)-based decision feedback equalisers (DFE), minimum mean square error (MMSE) and zero forcing (ZF) are utilized to reduce inter symbol interference (ISI). The bit error rate (BER) performance is evaluated in the presence of pointing error (PE) and turbulence using Monte Carlo channel modelling simulations. The results showed that RS coding with NLMS-DFE outperforms other techniques and achieves a BER of roughly 10−5 with a signal-to-noise ratio levels below 20 dB. The simulation results demonstrate that RS code with 15 total symbols per code word and 3 data symbols, i.e., RS (15, 3) and BCH code with 31 total symbols in a code word and 6 data symbols, i.e., BCH (31, 6) provided the best error performance among other coding schemes employed. It is inferred that RS (15, 3) coded 2 × 2 multiple input multiple output systems with NLMS-DFE achieved a BER value of 1.1925 ×  10−5 at 11 dB which is 16 dB less than uncoded system. Thus, the coded GFDM improves overall BER performance and has the potential to provide higher reliability for internet of underwater things (IoUT) applications.
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Authors and Affiliations

R. Hema
1
Ananthi A.
Diana D. C.
1

  1. Department of Electronics and Communication Engineering, Easwari Engineering College, 162 Bharathi Salai, Ramapuram, Chennai, Tamil Nadu 600089, India
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Abstract

The quantum efficiency of an InAs/InAsSb type-II superlattice (T2SL) high operating temperature (HOT) long-wavelength infrared (LWIR) photodetector may be significantly improved by integrating a two-dimensional subwavelength hole array in a metallic film (2DSHA) with the detector heterostructure. The role of the metallic grating is to couple incident radiation into surface plasmon polariton (SPP) modes whose field overlaps the absorber region. Plasmon-enhanced infrared photodetectors have been recently demonstrated and are the subject of intensive research. Optical modelling of the three-dimensional detector structure with subwavelength metallic components is challenging, especially since its operation depends on evanescent wave coupling. Our modelling approach combines the 3D finite-difference time-domain method (FDTD) and the rigorous coupled wave analysis (RCWA) with a proposed adaptive data-point selection for calculation time reduction. We demonstrate that the 2DSHA-based detector supports SPPs in the Sommerfeld-Zenneck regime and waveguide modes that both enhance absorption in the active layer.
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Authors and Affiliations

Andrzej Janaszek
1 2
ORCID: ORCID
Piotr Wróbel
2
ORCID: ORCID
Maciej Dems
3
ORCID: ORCID
Omer Ceylan
4
ORCID: ORCID
Yasar Gurbuz
4
ORCID: ORCID
Łukasz Kubiszyn
5
ORCID: ORCID
Józef Piotrowski
6
ORCID: ORCID
Rafał Kotyński
2
ORCID: ORCID

  1. Janaszek, Andrzej :VIGO Photonics, Poznańska 129/133, 05-850 Ożarów Mazowiecki, Poland
  2. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  3. Institute of Physics, Lodz University of Technology, Wólczańska 217/221, 93-005 Łódź, Poland
  4. Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, 34956 Istanbul, Turkey
  5. Kubiszyn, Łukasz :VIGO Photonics, Poznańska 129/133, 05-850 Ożarów Mazowiecki, Poland
  6. Piotrowski, Józef :VIGO Photonics, Poznańska 129/133, 05-850 Ożarów Mazowiecki, Poland
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Abstract

This work reports on the investigation of homogeneity of the inside of indium micro-bumps/ columns placed on Ti/Pt/Au under bump metallisation. This is very important for connection resistivity, long-time durability, and subsequent hybridisation process (e.g., die-bonding). Gold reacts with indium to form intermetallic alloys with different chemo-physical parameters than pure indium. The geometrical and structural parameters of intermetallic alloys were analysed based on transmission electron microscope images. Distribution of elements in the investigated samples was determined using the transmission electron micro-scope with energy dispersive spectroscopy method. A thickness of intermetallic alloy was 1.02 μm and 1.67 μm in non-annealed (A) and annealed (B) indium columns, respectively. The layered and column-like interior structure of alloys was observed for both samples, respectively, with twice bigger grains in sample B. The graded chemical composition of Au-In intermetallic alloy was detected for the non-annealed In columns in contrast to the constant composition of 40% of Au and 60% of In for the annealed sample B. The atomic distribution has a minor impact on the In column mechanical stability. A yield above 99% of an In column with a 25 µm diameter and a 11 µm height is possible for a uniform columnar structure of intermetallic alloy with a thickness of 1.67 μm.
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Authors and Affiliations

Paweł Kozłowski
1
ORCID: ORCID
Agata Jasik
1
ORCID: ORCID
Adam Łaszcz
1
ORCID: ORCID
Krzysztof Czuba