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[IEEE 2019 International Conference on Intelligent Sustainable Systems (ICISS) - Palladam, Tamilnadu, India (2019.2.21-2019.2.22)] 2019 International Conference on Intelligent Sustainable Systems (ICISS) - Modeling and Simulation of Multi-junction TANDEM Solar Cell
摘要： This paper manages with the modelling of quadruple junction solar cell (qjsc) constructed by using the semiconductor material of AlGaInP-GaAs-GaInAs-Ge at a particular value solar irradiance, temperature. Comparison of output I-V and P-V curve of quadruple junction solar cell is done with triple junction solar cell made up of InGaP-InGaAs-Ge semiconductor material and also single junction solar cell (sjsc) made of a Ge semiconductor by using MATLAB/SIMULINK. It has been found higher value of output voltage and power in quadruple junction solar cell as compared to single, dual or triple junction solar cell. The above described quadruple junction solar cell is made by using the material having a same lattice structure which helps to ease the flow of current in all the four junctions and analysis is done at solar irradiance (1000-800-500) W/cm2. The whole analysis is done through pessimistic approach on the basis of the single exponential model.
关键词： MATLAB Simulink,multi-junction solar cell,quadruple
更新于2025-09-12 10:27:22
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Numerical Analyses of High Concentrator Triple-Junction Solar Cell under Jet Impingement Cooling
摘要： The triple junction III-V(TJ) solar cells are commonly used for the high concentrator photovoltaic (HCPV) arrangements as they have high efficiency and have a good response to high concentration. Nevertheless, the efficiency of solar cells decreases with an increase of temperature especially under high solar irradiance concentration ratios where the temperature of solar cells reaches to very high levels. Consequently, heat dissipation by cooling is crucial for a concentrator photovoltaic solar cell at high concentration. Moreover, significant temperature difference possibly will exist within the cell body, so it is vital to identify the presence of thermal stresses that can cause failure and deformation of the cell body. This work investigated the capability of impinging jet cooling technique to maintain a triple junction solar cell temperature under recommended operating conditions. Furthermore, thermal stress analyses were performed. The results showed that employing jet impingements cooling improved both of thermal energy and electrical generation. In addition, the thermal stress is considerably decreased with increasing the cooling inlet mass flow rate.
关键词： Triple-Junction Solar Cell,High Concentrator Photovoltaic,High Concentrations,Thermal Stress
更新于2025-09-12 10:27:22
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Ultraviolet photodetectors based on doped ZnO films
摘要： In this paper, we report the realization of ultraviolet (UV) photodetector based on doped ZnO films. The ZnO p-n junction was fabricated on indium tin oxide (ITO) coated glass, which consists of n-type and p-type layers based on Ga-doped (2 at.%) and N-doped (20 at.%) ZnO films, respectively. The current-voltage (IV) characteristics, photosensitivity, photoresponsitivity, and photocurrent gain were derived to determine the performance of the device. At 5 V reverse bias, the ZnO-based UV photodetector exhibits photosensitivity of 10.9, photoresponsivity of 2.1 × 10-2 AW-1, and photoconductive gain of 7.2 × 10-2.
关键词： ultraviolet photodetectors,sol-gel spin coating,p-n junction,doped ZnO films
更新于2025-09-12 10:27:22
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - A 2 × 3 Hybrid Substrate Integrated Waveguide Coupler Applied to Beamforming Network
摘要： A 2 × 3 substrate integrated waveguide (SIW) H-plane hybrid coupler operating at 28 GHz with constant phase shifting outputs is proposed. This proposed 6-port hybrid junction coupler can equally divide the input power into the three output ports, with a constant relative phase difference +120?, 0?, ?120?. Simulation results indicate that within 5% relative bandwidth, our designs achieve a good impedance matching with high isolation, and equal power division having constant phase shifting.
关键词： hybrid coupler,six-port junction,H-plane directional coupler,substrate integrated waveguide (SIW),millimeter-wave techniques
更新于2025-09-12 10:27:22
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Simulation of a-Si:H/c-Si heterojunction solar cells: From planar junction to local junction
摘要： In order to obtain higher conversion efficiency and reduce production cost for the HIT (Heterojunction with Intrinsic Thin film) solar cell was investigated. The performance hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) based heterojunction solar cells, HACL solar cell was compared with that of the HIT and HACD (Heterojunction of Amorphous silicon and Crystalline silicon with Diffused junction) solar cells. The simulated results indicated that a-Si:H layer can bring about much absorption loss. The conversion efficiency and the short-circuit current density of the HACL cell can reach 28.18% and 43.06 mA/cm2, respectively, and are higher than that of the HIT and HACD solar cells. The main reasons for the great improvement are (1) to reduce optical absorption loss of a-Si:H and (2) to reduce photocarrier recombination for the HACL cell. The double-side local junction is very suited for the bifacial solar cells. For a HACL cell with n-type or p type c-Si base, all n-type or p-type c-Si passivating structure can decrease the consumption of rare materials since the transparent conductive oxide (TCO) can be free in this structure. It is concluded that the HACL solar cell is a promising structure for high efficiency and low cost.
关键词： a-Si:H/c-Si heterojunction,silicon solar cell,local junction,short-circuit current
更新于2025-09-12 10:27:22
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High Efficiency Solar Cells from Extremely Low Minority Carrier Lifetime Substrates Using Radial Junction Nanowire Architecture
摘要： Currently, a significant amount of photovoltaic device cost is related to its requirement of high-quality absorber materials, especially in the case of III-V solar cells. Therefore, a technology that can transform a low cost, low minority carrier lifetime material into an efficient solar cell can be beneficial for future applications. Here, we transform an inefficient p-type InP substrate with a minority carrier lifetime less than 100 ps into an efficient solar cell by utilizing a radial p-n junction nanowire architecture. We fabricate a p-InP/n-ZnO/AZO radial heterojunction nanowire solar cell to achieve a photovoltaic conversion efficiency of 17.1%, the best reported value for radial junction nanowire solar cells. The quantum efficiency of ~ 95 % (between 550 – 750 nm) and short circuit current density of 31.3 mA/cm2 are amongst the best for InP solar cells. Besides, we also perform an advanced loss analysis of proposed solar cell to assess different loss mechanisms in the solar cell.
关键词： radial junction,III-V solar cell,selective contact,nanowire solar cell,heterojunction
更新于2025-09-12 10:27:22
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Carbon@Tellurium Nanostructures Anchored to a Si Nanowire Scaffold with an Unprecedented Liquid-Junction Solar Cell Performance
摘要： Silicon nanowire (SiNW) arrays offer a range of exciting opportunities, from maximizing solar spectrum utilization for high-performance liquid-junction solar cells (LJSCs) to functioning as potential micro-supercapacitors in the near future. This work, contrasting strongly with the previously reported studies on SiNW-based LJSCs where electron-conducting nanoparticles of Pt or Au were employed to achieve high efficiencies, aims at tethering relatively inexpensive, hole-conducting, and photoresponsive carbon-coated tellurium nanorods (C@TeNRs) to SiNWs in the quest to achieve an outstanding solar cell performance. A SiNW LJSC (control cell) with a SiNWs/Br?, Br2/carbon-fabric architecture delivers a power conversion efficiency (PCE) of 4.8%. Further, by anchoring C@TeNRs, along the lengths of SiNWs via electrophoresis, a PCE of ～11.6% is attained for a C@TeNRs@SiNWs/Br?, Br2/carbon-fabric-based LJSC. The multifunctionality of C@Te comes to the fore in this cell where (1) the p-type (hole) conducting nature of C@Te ensures efficient charge separation by rapidly collecting holes from SiNWs (and suppresses recombination), (2) the C@TeNRs are also photoresponsive and increase light-harvesting, and (3) the C coating restricts the chemical corrosion and photo-oxidation of SiNWs and the Te core by the acidic electrolyte, thereby improving the cell’s operational lifetime. This LJSC also serves as an effective stand-alone energy-storage device giving an improved areal specific capacitance of 1605 μF cm?2 (at 1 mA cm?2). This study unravels the pivotal role played by C@TeNRs in controlling the performance of SiNW-based LJSCs.
关键词： tellurium nanorods,solar cell,liquid junction,high efficiency,silicon nanowires
更新于2025-09-12 10:27:22
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Study of the static characteristic I-V and the electrical parameters corresponding to the shunt resistance Rsh and series resistance Rs per unit area of a solar cell with grain size
摘要： This paper presents a new technique based on the junction recombination velocity (Sf: junction recombination velocity) at the grain size for the evaluation of the series and shunt resistances. The study of the response of the solar cell and the parameters of recombination in grain size, which are the object of the investigation, is related to the study of the static characteristic I-V and electrical parameters Rs and Rsh under a magnetic field. This study has allowed us to address some of the theoretical aspects of the field solar cell in order to draw a conclusion and some perspectives. Based on the results obtained for the photocurrent density and the photovoltage, we will study the I-V characteristic of the solar cell to then be able to propose a model for the determination of the shunt resistance Rsh and the series resistance Rs. Series resistance investigations, including numerical simulations and field data tests, are conducted to examine the energetic behavior of the PV modules for efficiency. Experimental results show that the proposed direct resistance-estimation method allows the PV modules to achieve their maximum power and efficiency under various operation conditions.
关键词： Magnetic field,Solar cell,Series resistance,Shunt resistance,Grain size,Junction Recombination Velocity
更新于2025-09-12 10:27:22
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[IEEE 2019 European Space Power Conference (ESPC) - Juan-les-Pins, France (2019.9.30-2019.10.4)] 2019 European Space Power Conference (ESPC) - High Efficiency Lattice-Matched 4J Space Solar Cells on GaAs
摘要： A lattice-matched four-junction solar cell on a GaAs substrate, for space applications, is demonstrated. The solar cell incorporates MBE grown GaInP, GaAs, GaInNAsSb and GaInNAsSb junctions with band-gaps of 1.9 eV, 1.4 eV, 1.2 eV and 0.9 eV, respectively. For AM0 illumination, the cell exhibited a maximum efficiency of 27%. For this performance, a high collection efficiency for the bottom cell is required. The high efficiency and current generation for the four-junction solar cell is primarily enabled by achieving a very low background doping level (~5×1014 cm-3) and high charge carrier lifetimes (2-4 ns) for the GaInNAsSb bottom junction. Achieving an efficiency of 33% is deemed possible by further reduction of reflection, shadowing and transmission losses.
关键词： four-junction solar cell,dilute nitrides,molecular beam epitaxy
更新于2025-09-12 10:27:22
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Thermal-stress distribution and damage characteristics of three-junction GaAs solar cell irradiated by continuous laser beam
摘要： According to the theory of Fourier heat transfer and thermal stress field, a model on thermal damage of three-junction GaAs solar cell is established. The temperature and thermal-stress distribution inside the solar cell, which irradiated by continuous laser, are calculated. Results show that the temperature and thermal-stress distribution are corresponded to the intensity distribution of the incident laser beam. The maximum values of the compressive and tensile stress increase with the increasing of the power density and waist radius of the incident laser. When the waist radius is 0.5 cm, the melting damage is the main damage pattern as the power density is below about 40 W/cm2. However, when the laser power density is higher the stress damage will change to the main damage form. As the waist radius increases, the change in damage processes will also occur at lower laser power density.
关键词： Three-junction GaAs solar cell,Thermal-stress,Continuous laser beam,Damage
更新于2025-09-12 10:27:22