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After the golden era of silicon, nowadays compound semiconductors from III-V group is extensively studied to observe their application in electronic as well as in other field. Solar cell which is providing alternative source in our industries, houses and laboratories. Researchers are now trying to find out new features by using these inorganic materials based solar cell which can easily be paved the...
In our research work electrical characterization with different generation of solar cells depending upon the emergence as- First Generation: Mono and Poly-crystalline Silicon, Second Generation: Thin-film Solar Cell, Third Generation: Full Spectrum Utilization with comparative efficiency study of different solar cells is investigated. Besides, major part of our research is Multi-Junction Solar Cells...
In this work, an efficient method is applied to calculate the miniband structure and density of states for well-ordered Ge/Si quantum dot (QD) array fabricated by combining the self-assemble bio-template and damage-free neutral beam etching. Within the envelop-function framework, this computational model surmounts theoretical approximations of the multi-dimensional Kronig-Penney method and the numerical...
We study the efficiency of several types of all-dielectric light-trapping and antireflective coatings for the enhancement of photovoltaic absorption in thin-film silicon solar cells. We compare the photovoltaic absorption enhancement offered by a square array of nanovoids in the dielectric covering of the cell with that granted by a flat blooming layer, and a densely packed array of dielectric nanospheres.
Issues associated with exploiting a multicrystalline silicon solar cell as a ground plane for an Inverted-F Antenna at 2.45 GHz are reported. Current flow on the solar lattice greatly affects the impedance match of a microstrip transmission line positioned above the solar cell. As a result, an antenna designed with a transmission line parallel to the lattice experiences performance degradation when...
Impressive efficiency enhancement of 15.38% of crystalline-silicon solar-cell with Eu-doped silicate-phosphors and SiO2-layer using spin-on technique is demonstrated. Reflectance, external quantum efficiency, and photovoltaic I-V characteristics are used to examine the downshifting effectiveness.
We design by transformation optics, fabricate by three-dimensional direct laser writing, and characterize experimentally polymer-based cloaks for 20 μm wide gold-wire contacts on a silicon wafer. The contact shadowing effect is reduced by 90%.
Photovoltaic cell conversion efficiencies for quasi-monochromatic radiation have been measured as a function of the wavelength. It has been proven that the conversion efficiency is nearly proportional to the wavelength of the input radiation as the theory predicts. Also, it has been shown that the efficiency increases as a logarithmic function of the input irradiance. In conclusion, highest conversion...
This paper provides an aspect of coming PV technology taking into account the paradigm shift of recent PV industry and market, i.e. material to system. In the early stage of the PV technology, the solar cell material and device for aiming at higher efficiency and lower cost have been emphasized, because more than 60% of the total cost is shared by solar cells. As the cost of solar cells is going down...
We report effective passivation of silicon surfaces by heating single crystalline silicon substrates in liquid water at 110°C for 1 h. High values of photo-induced effective minority carrier lifetime τeff were obtained ranging from 8.3×10−4 to 3.1×10−3 s and from 1.2×10−4 to 6.0×10−4 s over the area of 4 inch sized n- and p-type samples, respectively, while values of τeff of initial bare samples were...
We propose a method of reduction in optical reflection loss by transparent conductive Indium Gallium Zinc Oxide (IGZO) for the purpose of fabricating mechanical stacked solar cells. Si and Ge substrates coated with 200 nm thick 0.058 Ωcm IGZO layers were stacked with epoxy-type transparent adhesive dispersed with 20 µm sized Indium Thin Oxide (ITO) particles to form a structure of Si/IGZO/adhesive/IGZO/Ge...
This work demonstrated the preparation of new and effective antireflection SiC-SiO2 nanocomposite by sol-gel process for Si solar cells. The AR coating was conducted in two steps: i) sol-gel derived precursor was coated on p-type Si wafer by spin coating, and ii) the coated wafer was subjected to annealing at 450°C for 1h. The reflectance analysis revealed that SiC-SiO2 layers presented the relatively...
This paper shows the results and the limitations of a 21% N-Cz 239cm2 screen printed cell with blanket p+ and n+. In addition, we show the properties and impact of tunnel oxide capped with doped n+ polysilicon and metal on the back side which can overcome those limitations. Since both the doped n+ layer and the metal contact are outside the bulk silicon wafer, the Jo is dramatically reduced resulting...
In this manuscript is discussed the potential of using silicon heterojunction solar cells to obtain flexible silicon modules. Modules were manufactured using non-metalized silicon heterojunction solar cell with thicknesses down to 70 µm. The modules were rolled around curved surfaces with different diameters. Rolling diameters down to 5 cm were tested. Damages in the solar cells due to the rolling...
In our work we observe the light behavior before and after light-induced degradation of amorphous/microcrystalline (a-Si/μc-Si) tandem silicon-based solar cells. We show that during light-induced degradation the efficiency increases for illumination levels lower than standard test condition illumination. Additionally we examine the temperature coefficient of the open circuit voltage, short circuit...
In this work we have fabricated inorganic Silicon solar cells coated by a thin layer of Al-doped ZnO (ZnO:Al). Planar solar cells were fabricated by spin on dopant diffusion method. Thin layers of ZnO:Al were deposited by Atomic Layer Deposition method at different temperatures and ZnO/Al ratios. As a result of the deposition of a large bandgap material on top of the sample, it was found that both...
We report on the fabrication and characterization of both flat and patterned c-Si solar cells on glass. We use epitaxial layers grown by plasma enhanced chemical vapor deposition at low temperature (T<200°C), and anodic bonding on glass substrate. Inverted nanopyramids are fabricated by nanoimprint lithography and wet etching in alkaline solution. With 3µm-thick c-Si layers, the performances achieved...
Reducing the thickness of crystalline Si wafers to be processed into solar cells yields several significant benefits: PV module manufacturing cost can be reduced and the required diffusion length of minority carriers is smaller. The latter in turn enables a higher efficiency potential and a larger spread of Si materials to be employed for rear junction solar cell concepts which are advantageous for...
A high cell performance is one of the key drivers to reduce the levelized cost of electricity for PV. Nevertheless, the production costs of a solar cell technology have to be low, to allow a market entry. A both sides-contacted solar cell can potentially fulfill both requirements. In this work we present the latest results of our DOE FPACE project: A both sides-contacted n-type solar cell with a passivated...
We introduce a microstructure model that consistently correlates the microstructure of nanocrystalline silicon oxide (nc-SiOX:H) to its optical and electrical properties. We successfully validated the model by means of a large quantity of systematically and individually optimized n- and p-doped nc-SiOX:H films deposited at very high frequency (VHF) and radio frequency (RF). In particular, this model...
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