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Currently, solar energy is the primary source of energy for space missions. The development of space systems is affected to many fields: the study of space itself, the science of materials and especially the field of energy. Indeed, solar panels are the only non-nuclear means that enable satellites in orbit to be fed continuously. The efficiency of these solar cells increases. Current triple junction...
In this work, a comparative study for the n-type emitter formation in the fabrication of simple structures of crystalline silicon (c-Si) solar cells is reported. Gas and spin on dopant sources were employed in the pn junction formation of the solar cells in order to compare their performance. Phosphine (PH3) was used as n-type gas for phosphorus diffusion while the Filmtronics Spin-On Dopant SOD-P905...
This paper is focused on the dynamic modelling of the polycrystalline silicon wafer-based photovoltaic cells under various operational and fault conditions. The models are drawn from the impedance changes observed using electrochemical impedance spectroscopy. In this paper, tests were carried out at different voltage bias levels under illumination, dark, uniform partial shading, and cell-mismatch...
In this work, the characteristics of a Si-solar cell (PV) model is studied. The proposed modelis a four layer system with an ultra-thin film of Fe-InGaAsPlaid above Silicon (Si) substrate and covered by AlON layer that is exposed to air directly. The efficiency is measured by the reflectance power (R) and transmittance power (T). R and T are derived by using the transfer matrix method for both TE...
The structural and chemical properties of Cadmium Telluride (CdTe) thin films received at different technology conditions were investigated. Thin films of CdTe were grown on Silicon (100) and glass substrates using by vapor phase condensation method. Morphological properties of the thin film surface and the cross section were investigated by scanning electron and atomic force microscopies. A cross...
Now, crystalline silicon solar cells are approaching a major technical turning point. Conventional solar cells which are currently the mainstream are widely used and production cost is low, but it is difficult to achieve high efficiency exceeding 20%. Therefore, development and mass production of PERC cells, which will become mainstream of the next generation, are rapidly progressing. The cell efficiency...
In order to achieve high-efficiency solar cells, a tandem structure with perovskite and silicon solar cells was introduced and concerned, recently. However, it was difficult to form perovskite top cell on “textured” silicon solar cell due to the in homogeneity layer of perovskite top cells by solution process. In this work, therefore, in order to combine perovskite solar cell as a top cell and “textured”...
The thickness of wafers for manufacturing silicon solar cells is getting thinner in order to take advantage of the advancement of wafer fabrication process technology and price competitiveness. As the thickness of the wafer becomes thinner, the solar cell manufacturing process and technology for thinner wafer are needed. In this paper, we analyze the tendency of optical and electrical losses according...
The main objective of this paper is to increase the power conversion efficiency by effective solar spectral band splitting. This is attained here by cascading semiconductor materials of varying energy band gap arranged in the decreasing order. In addition, an efficiency of a multijunction solar cell can be improved by current and lattice constant matching of the cells. Accordingly, a multijunction...
This paper presents current status and future direction of Photovoltaic (PV) electric power system installations in the world. This article also overviews PV R&D activities in Japan as the PV R&D Project Leader of NEDO and JST. Present status of various solar cells efficiencies under NEDO and JST PV R&D projects are presented: 44.4% for concentrator III-V compound 3-junction solar cell,...
We present a comprehensive photonic approach for passive cooling of solar cells by simultaneously performing radiative cooling while also selectively utilizing the sunlight. We design a photonic cooler made of multilayer dielectric stack that can strongly radiate heat through its thermal radiation while also significantly reflecting the solar spectrum in sub-band gap and ultraviolet regime. We show...
Pb-free silver pastes based on SnO-B2O3 glass frits were synthesized and used for the front-contact electrodes of crystalline silicon (c-Si) solar cells. First, four kinds of SnO-B2O3 glass frits with different amounts of SnO were synthesized by a melt-quenching method, and four Ag pastes based on these glass frits were prepared correspondingly. Then, Ag pastes were printed on c-Si solar cells and...
Photovoltaic (PV) technology development is dominated by the largest application, utility-scale energy generation. Although military PV applications share some of the same attributes as those for utility-scale PV, the Navy PV technology development is focused on filling the gaps between what exists for utility energy generation and specific military applications. In this paper, we discuss the unique...
The GaAsP/Si dual-junction solar cells have been systematically investigated in our paper by using AMPS (Analysis of Microelectronic and Photonic Structures). Based on the optimized results of single-junction solar cells, we propose a promising method to improve the properties of the dual-junction solar cell. And the monolithic GaAsxP1−x/Si dual-junction solar cells with various As compositions (x=0...
The objective of this work was to investigate how cobalt oxide doped coatings in the form of thin films could affect the electrical response of silicon (Si) solar cells. Spin coated thin films consisting of a polymeric solution of cobalt oxide-antimony doped tin oxide (CoO-ATO) were used as coatings on 3" × 6" Si solar cells. Based on the spectral response of CoO-ATO, it is hypothesized...
External Quantum Efficiency (EQE) measurement is one important method that is implemented to observe solar cells' behaviour in a specific range of wavelength. This research measured EQE in different type of solar cells: silicon, dye-sensitised solar cell (DSSC), and perovskite solar cell. The objectives of this research are to understand the correct EQE measurement method and to understand the factors...
By simultaneously considering the enhancement of quantum confinement on the effective bandgap and minimum transition energy, the silicon (Si)/ silicon carbide (SiC) quantum dot superlattice (SiC-QDSL) with aluminum oxide (Al2O3-QDSL) passivation layer shows the high short-circuit current (Jsc) of 4.77 mA/cm2 in theoretical, which agrees with the Jsc of 4.75 mA/cm2 obtained in the experiment under...
Solar cells have been through many development phases. Silicon is a one of many important materials in solar cell manufacturing. One of silicon solar cell applications which can produce high efficiency is Heterojunction with Intrinsic Thin-layer (HIT) crystalline silicon solar cell. Another alternative of silicon solar cell applications is Heterojunction with Compound Thin-layer (HCT) crystalline...
Installation of photovoltaic cell has been increasing day by day in industries and houses due to the increase in cost of power. But the major concern for the increase in future usage of the photovoltaic cell depends on the improvement in efficiency. Accumulation of soil and debris in the photo voltaic cell from the environment reduces the efficiency at the considerable level. In this paper, increase...
In this study, the optoelectronic properties of a monolithically integrated series-connected tandem solar cell are simulated. Following the large success of hybrid organic-inorganic perovskites, which have recently demonstrated large efficiencies with low production costs, we examine the possibility of using the same perovskites as absorbers in a tandem solar cell. The cell consists in a methyl ammonium...
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