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A combined geographical information system and Best–Worst Method approach for site selection for photovoltaic power plant projects
摘要： Site selection is one of the most important components of the execution of a solar photovoltaic power plant. The main aim of this study is to introduce an evaluation model for determining the optimal location for a photovoltaic project, based on Geographic Information System with a Multi-Criteria Decision-Making approach. The model takes into account various measures in three categories, namely climatic, location, and orography, to ensure select the best location from execution and technical points of view. Best–Worst Method, as a novel scheme, is employed for prioritization of criteria, in which the best and worst criteria play a significant role in decision making. After excluding restricted areas, weighted criteria are used to produce the necessary maps by GIS. Land suitability index is also defined and used to classify lands into five different groups. China’s capital, Beijing, is evaluated as a case study by focusing on the available data. SolarGIS maps as well as several ArcGIS tools are used in this study. The obtained results suggest that 27.4% of the studied region, mainly on the northern and northeastern parts of Beijing, is suitable for establishing these projects. Furthermore, based on land suitability index results, 61.96% of the suitable regions is classified as the “most suitable” category, whereas 27.14% is found to be “very suitable”. In the end, the proposed approach is found to be effective and compatible with the subject of this study.
关键词： Air pollution,Multi-criteria decision making,Solar energy,Renewable energy,Beijing
更新于2025-09-11 14:15:04
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Fabrication of in-situ Ti-doped CuGaS2 thin films for intermediate band solar cell applications by sputtering with CuGaS2:Ti targets
摘要： Intermediate band solar cells (IBSCs) have great potential for improving device efficiencies, which can be fabricated by doping appropriate elements into a matrix semiconductor with a high band-gap (Eg). CuGaS2 (CGS) is an absorber with high absorption coefficient and high Eg, which is suitable to be a matrix. And some transition metals are suitable doping elements. Here, in-situ Ti-doped CGS thin films were deposited by sputtering CuGaS2:Ti targets to prepare IBSCs. The targets were fabricated by hot-pressed sintering of ball-milled Cu2S, Ga2S3, and TiS2 mixed powders. In-situ Ti-doped precursor films were prepared by sputtering with these targets. After sulfurization, grains grew up and CGS phases were gained. The Ti atoms were successfully doped into the CGS lattices. The Eg of about 2.42 eV was consistent with CGS. The current density-voltage curve of the solar cell exhibited exponential characteristics. This approach has enormous promise for the preparation of IBSCs.
关键词： In-situ doping,Intermediate band solar cells,CuGaS2:Ti targets,Sputtering,Solar energy materials
更新于2025-09-11 14:15:04
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Toward a New Energy Era: Self‐Driven Integrated Systems Based on Perovskite Solar Cells
摘要： Integrated smart portable devices (e.g., self-powered devices) that utilize the environment-friendly energy (e.g., solar energy) by means of photovoltaic technology (e.g., solar cell) are a popular concept in the current technological development trend. As a key component of integrated devices, photovoltaic devices acting as a bridge between solar energy and working devices play an important role in the whole system performance. The emergence of perovskite solar cells (PSCs) with high power conversion efficiencies (over 25%) allows for the possibility and appearance of many multifunctional self-powered integrated devices. In this review, a systematic overview of self-powered integrated devices based on PSCs that are reported so far is provided, including integrated energy storage devices, integrated artificial photosynthesis devices, and other self-powered integrated devices. The key strategies for fabricating these devices and performance are also discussed to further the understanding of fundamental device physics. Finally, the current challenging issues and future perspective are provided to promote the development of self-powered integrated devices based on PSCs in the near future.
关键词： multifunctional integrated systems,solar energy,perovskite solar cells
更新于2025-09-11 14:15:04
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Life cycle analysis of a building integrated photovoltaic system operating in Bogotá, Colombia
摘要： In this study, the environmental behavior was characterized for a 840 Wp building-integrated photovoltaic (BIPV) system installed in the Department of Physics of the Faculty of Sciences at the National University of Colombia, Bogota campus. The methodology focused on the application of the international technical standards for Life Cycle Analysis (LCA) from cradle to grave based on the NTC ISO 14040 and NTC ISO 1404 standards, which regulate the methodological procedure. This article is based on comparing the potential of environmental impacts of five power generation scenarios, taking as reference the installation of the photovoltaic system (PV) at the University. During the analysis it was possible to determine that energy generation with coal has a greatest environmental impact compared with photovoltaics: 84% and 6% respectively. This represents 1138.8 gCO2eq/kWh for coal, compared to 35 gCO2eq/kWh for the PV system.
关键词： Solar energy,Solar cells,Greenhouse emissions,Photovoltaic systems,Life cycle analysis
更新于2025-09-11 14:15:04
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Ag-decorated TiO2 nanofibers for highly efficient dye sensitized solar cell
摘要： For dye-sensitized solar cell, the modification of noble metals plays an important role in improving the light absorption of TiO2 films and reducing the recombination of electrons and holes. The composite photoanode of TiO2 nanoparticles/nanofibers (NP/NF) was prepared and soaked in AgNO3 solution at 0.01 mol/L, and the silver content was obtained according to different reduction times. The power conversion efficiency (PCE) increased from 5.39% to 6.36%. The PCE of composite photoanode increased by 18.0% compared with that of the photoanode without Ag modification.
关键词： TiO2 nanofibers,Ag-decorated TiO2 nanofibers,Solar energy materials,Dye sensitized solar cell,Nanocrystalline materials
更新于2025-09-11 14:15:04
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A Paper-Based Biological Solar Cell
摘要： A merged system incorporating paperfluidics and papertronics has recently emerged as a simple, single-use, low-cost paradigm for disposable point-of-care (POC) diagnostic applications. Stand-alone and self-sustained paper-based systems are essential to providing effective and lifesaving treatments in resource-constrained environments. Therefore, a realistic and accessible power source is required for actual paper-based POC systems as their diagnostic performance and portability rely significantly on power availability. Among many paper-based batteries and energy storage devices, paper- based microbial fuel cells have attracted much attention because bacteria can harvest electricity from any type of organic matter that is readily available in those challenging regions. However, the promise of this technology has not been translated into practical power applications because of its short power duration, which is not enough to fully operate those systems for a relatively long period. In this work, we for the first time demonstrate a simple and long-lasting paper-based biological solar cell that uses photosynthetic bacteria as biocatalysts. The bacterial photosynthesis and respiration continuously and self-sustainably generate power by converting light energy into electricity. With a highly porous and conductive anode and an innovative solid-state cathode, the biological solar cell built upon the paper substrates generated the maximum current and power density of 65 μA/cm2 and 10.7 μW/cm2, respectively, which are considerably greater than those of conventional micro-sized biological solar cells. Furthermore, photosynthetic bacteria in a 3-D volumetric chamber made of a stack of papers provided stable and long-lasting electricity for more than 5 h, while electrical current from the heterotrophic culture on 2-D paper dramatically decreased within several minutes.
关键词： photosynthetic bacteria,microbial fuel cells,paper-based point-of-care diagnostic devices,solar energy harvesting,paper-based biological solar cells
更新于2025-09-11 14:15:04
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Optimal Design Method of a Hybrid CSP-PV Plant Based on Genetic Algorithm Considering the Operation Strategy
摘要： Solar energy is the most abundant renewable energy and it has a great potential for development. There are two ways to transfer solar energy to electricity: photovoltaic power generation (PV) and concentrated solar power (CSP). CSP-PV hybrid system can be fully integrated with the advantages of the two systems to achieve low cost, stable output, and manageable to generate electricity. In this paper, the operation strategy of the CSP-PV system is proposed for parabolic trough CSP system and PV system which are now commercially operated. Genetic algorithm is used to optimize the design of the system and calculate PV-installed capacity, battery capacity, and storage capacity of CSP system, making the system to achieve the lowest cost of electricity generation. The results show that the introduction of the CSP system makes it possible to ensure the stability of the output power of hybrid system when the battery capacity is small, which greatly improves the annual utilization time of the PV and reduces solar abandonment. When the system is optimized by operation characteristics of Spring Equinox, the lowest LCOE is 0.0627 $/kWh, the rated capacity of PV and CSP system are 222.462 MW and 30 MW, storage and battery are 356.562 MWh and 14.687 MWh. When the system is optimized by the operation characteristics of the whole year, the lowest LCOE is 0.0555 $/kWh, the rated capacity of PV and CSP system are 242.954 MW and 30 MW, respectively, and the capacity of heat storage and battery are 136.059 MWh and 8.977 MWh. The comparison shows that the power generation curves of the hybrid system are similar in the two optimization-based methods—Spring Equinox based and annual based, but LCOE is lower when optimized by the annual operation characteristic, and the annual utilization rate of the system is higher when optimized by Spring Equinox based.
关键词： concentrated solar power,operation strategy,genetic algorithm,LCOE,photovoltaic power generation,solar energy,CSP-PV hybrid system
更新于2025-09-11 14:15:04
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Improving Performance of a Photovoltaic Panel by Pin Fins: A Theoretical Analysis
摘要： As efficiency of PV modules decreases with temperature rise, cooling methods can increase the power output and efficiency. One of the strategies for this purpose is passive cooling by implementing fins to the backside of a module. In the present study, annual energy output of a 50 W panel is analytically calculated in two unfinned and pin-finned cases based on hourly meteorological data for Shiraz, Iran. The results show that with the installation of 2-cm, 4-cm and 6-cm aluminum pin fins with finned-to-total-backside-area ratios of 0.17, 0.27 and 0.55, the power output increases by 1.24–4.16%, compared to the unfinned case. This increase is equivalent to 1.04–3.50 kWh more electrical energy production during a year.
关键词： Fin,Photovoltaic panels,Passive cooling,Solar energy
更新于2025-09-11 14:15:04
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Advanced Cooling Technologies and Applications || Development of Modular Cooling for Water-Cooled Photovoltaic Plant in Real Scale
摘要： This chapter evaluates module architectures and units of photovoltaic cooling systems, aiming to determine, select and design a modular system that can be applied in a real-scale photovoltaic power plant (PVPP) in order to enhance the yields of electricity production (entitled cooled photovoltaic plant). An analysis of the local climatic, geographic and solar conditions as well as construction, operational and maintenance aspects was carried out. Worldwide, there are three main types of cooled photovoltaic systems: PVT liquid and air collectors, PV ventilated with heat recovery and non-PVT systems. Based on the local weather conditions (tropical warm and dry) with both temperature and solar irradiation index being high, it results the PVT-liquid system to be more suitable in a scenario with available cooling fluid. We conclude that the best design and arrangement of the cooling system are of the type coil and multiple channel because they permit better rates of heat exchange between the cooling fluid and the PV module.
关键词： solar energy,cooling photovoltaic system,photovoltaic/thermal,PVPP,SFV
更新于2025-09-11 14:15:04
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Superficial composition engineering for oxide nanoparticles derived Cu2ZnSn(S, Se)4 solar cells by a three-step annealing process
摘要： In this work, a three-step (sulfurization-selenization-sulfurization) annealing process was designed to optimize the surface constitution of Cu2ZnSn(S, Se)4 (CZTSSe) thin films, which was prepared by oxide nanoparticles-based approach. The devices with the Mo/CZTSSe/CdS/ZnMgO/ZnO:Al/Al structure were fabricated and their performances were studied. The additional post-sulfurization with low toxicity sulfur powder has negligible impact on the structure, morphology and composition of CZTSSe bulk, however, it improves open circuit voltage of device significantly. The open circuit voltage can be increased significantly from 408 mV (without surface sulfurization) to 497 mV (with surface sulfurization). This is benefited from the increase of surficial sulfur content and the broadening of the surface band-gap of the CZTSSe thin film. The result is confirmed by X-ray photoelectron spectroscopy analysis. Such a crucial three-step annealing process promotes the power conversion efficiency from 4.71% (2-step) to 6.37% (3-step), which is the champion efficiency of oxide precursor derived CZTSSe solar cell.
关键词： Thin films,Cu2ZnSn(S, Se)4,Solar energy materials,Post-sulfurization
更新于2025-09-11 14:15:04