Pseudo colorization of electroluminescence images of multi-crystalline silicon solar cells for defect inspection

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940010
Author(s):  
Keh-Moh Lin ◽  
Horng-Horng Lin ◽  
Harshad Kumar Dandage ◽  
Yi-Chun Du
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Crystalline Silicon ◽  
Silicon Solar Cells ◽  
Defect Inspection ◽  
Feature Clustering ◽  
Crystalline Silicon Solar Cells ◽  
Si Solar Cells ◽  
Pseudo Color ◽  
Human Inspection

Computer imaging of electroluminescence (EL) has been successfully applied to solar cell inspection in recent years, as EL image intensities reflect the efficiency levels and/or defects in sc-Si and mc-Si solar cells. In this paper, we propose a novel computational scheme for pseudo colorization of EL images to highlight defect regions in solar cells for human inspection. Specifically, given a template EL image and pseudo color labels on its defect regions, we impose the pseudo colors to other grayscale EL images, with respect to different defect types and image structures, by template feature clustering and pseudo color transferring. Our experiments show that the proposed approach indeed improves the readability of EL images and provides better visualization of solar cell defects.

scholarly journals Broadband-sensitive Ni2+–Er3+ based upconverters for crystalline silicon solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55499-55506 ◽  
Author(s):  
Hom N. Luitel ◽  
Shintaro Mizuno ◽  
Toshihiko Tani ◽  
Yasuhiko Takeda
Keyword(s):  
Solar Cells ◽  
Crystalline Silicon ◽  
Solar Irradiation ◽  
Silicon Solar Cells ◽  
Crystalline Silicon Solar Cells ◽  
Si Solar Cells ◽  
Limiting Efficiency

The newly developed CaZrO3:Er3+,Ni2+ broadband-sensitive upconverter utilizes 1060–1600 nm solar irradiation and can surpass the limiting efficiency of c-Si solar cells.

The Business of Fast ALD Equipment for Depositing Alumina Passivation Layers on Crystalline Silicon Solar Cells.

2011 ◽  
Vol 1353 ◽  
Author(s):  
Ad Vermeer ◽  
Roger Gortzen ◽  
P. Poodt ◽  
F. Roozeboom
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
High Throughput ◽  
Crystalline Silicon ◽  
Atomic Layer ◽  
Silicon Solar Cells ◽  
Alumina Layer ◽  
Solar Cell Efficiency ◽  
Crystalline Silicon Solar Cells ◽  
Cell Efficiency

ABSTRACTAtomic Layer Deposition (ALD) is a gas phase deposition technique for depositing very high quality thin films with an unsurpassed conformality. The main drawback of ALD however is the very low deposition rate (~ 1 nm/min). Recently, record deposition rates for alumina of up to 1 nm/s were reached using spatial ALD, while maintaining the typical assets regarding film quality as obtained by conventional, slow ALD [1]. This allows for ALD at high throughput numbers.One interesting application is passivation of crystalline silicon solar cells. Applying a thin alumina layer is reported to increase solar cell efficiency and enables the use of thinner wafers, thus reducing the main cost factor [2]. In this paper we report on the latest progress made by SoLayTec that delivered a working prototype of a system realizing full area single sided deposition of alumina on 156 x 156 mm2, mono- and multi crystalline silicon wafers for solar cell applications. The alumina layers showed excellent passivation. Based on this concept, a high-throughput ALD deposition tool is being developed targeting throughput numbers of up to 3000 wafers/hr. Finally, we report on the process of commercializing this technology.

Firing and Contact Resistivity of Ag2O-Aided Pb-Free Silver Paste for Crystalline Silicon Solar Cells

2016 ◽  
Vol 847 ◽  
pp. 123-130 ◽  
Author(s):  
Ruo Bing Jiao ◽  
Tao Wu ◽  
Bo Ping Zhang ◽  
Liang Liang Li
Keyword(s):  
Solar Cells ◽  
Crystalline Silicon ◽  
Electrical Contact ◽  
Decomposition Temperature ◽  
Contact Resistivity ◽  
Silicon Solar Cells ◽  
Silver Paste ◽  
Crystalline Silicon Solar Cells ◽  
Si Solar Cells ◽  
Ag Crystallites

The silver pastes containing Ag2O powder, Ag powder, α-terpineol, ethyl-cellulose and Pb-free glass were synthesized for crystalline silicon (c-Si) solar cells. It was found that α-terpineol assisted the decomposition of Ag2O powder and effectively lowered the decomposition temperature of Ag2O. Ag nanoparticles were produced during the decomposition of Ag2O, which helped to reduce the sintering temperature of the silver pastes. The Ag2O-aided silver pastes were fired on polycrystalline silicon solar cells at various temperatures, and large plate-shaped Ag crystallites appeared at the interfaces between the sintered pastes and the emitter, which ensured a good electrical contact. The contact resistivity of Ag2O-aided silver paste with an optimal ratio of Ag2O to Ag was lower than that of the paste with pure Ag powder. The lowest contact resistivity of Ag2O-aided Pb-free silver pastes sintered at 800°C was 0.029 Ω⋅cm2, which was close to that of commercial silver paste that contained Pb-based glass (0.026 Ω⋅cm2). The experimental data demonstrated that the addition of Ag2O reduced the contact resistance and promoted the sintering of Pb-free silver pastes, and Ag2O-aided Pb-free silver paste could be a promising candidate used for front-contact electrode of c-Si solar cells.

Characterization of Nanoporous Silicon Layer to Reduce the Optical Losses of Crystalline Silicon Solar Cells

2007 ◽  
Vol 7 (11) ◽  
pp. 3713-3716 ◽  
Author(s):  
Soohong Lee ◽  
Eunjoo Lee
Keyword(s):  
Surface Modification ◽  
Solar Cells ◽  
Solar Cell ◽  
Crystalline Silicon ◽  
Electrochemical Etching ◽  
Wavelength Region ◽  
Silicon Solar Cells ◽  
Porous Si ◽  
Optical Losses ◽  
Crystalline Silicon Solar Cells

Reduction of optical losses in crystalline silicon solar cells by surface modification is one of the most important issues of silicon photovoltaics. Porous Si layers on the front surface of textured Si substrates have been investigated with the aim of improving the optical losses of the solar cells, because an anti-reflection coating and a surface passivation can be obtained simultaneously in one process. We have demonstrated the feasibility of a very efficient porous Si AR layer, prepared by a simple, cost effective, electrochemical etching method. Silicon p-type CZ (100) oriented wafers were textured by anisotropic etching in sodium carbonate solution. Then, the porous Si layers were formed by electrochemical etching in HF solutions. After that, the properties of porous Si in terms of morphology, structure and reflectance are summarized. The structure of porous Si layers was investigated using SEM. The formation of a nanoporous Si layer on the textured silicon wafer result in a reflectance lower than 5% in the wavelength region from 500 to 900 nm. Such a surface modification allows improving the Si solar cell characteristics. An efficiency of 13.4% is achieved on a monocrystalline silicon solar cell using the electrochemical technique.

Influence of ITO layer application on electrical parameters of silicon solar cells with screen printed front electrode

2016 ◽  
Vol 33 (3) ◽  
pp. 172-175 ◽  
Author(s):  
Kazimierz Drabczyk ◽  
Jaroslaw Domaradzki ◽  
Grazyna Kulesza-Matlak ◽  
Marek Lipinski ◽  
Danuta Kaczmarek
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Crystalline Silicon ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Electrical Performance ◽  
Silicon Solar Cells ◽  
Content Type ◽  
Crystalline Silicon Solar Cells ◽  
Screen Printed

Purpose The purpose of this paper was investigation and comparison of electrical and optical properties of crystalline silicon solar cells with ITO or TiO2 coating. The ITO, similar to TiO2, is very well transparent in the visible part of optical radiation; however, its low resistivity (lower that 10-3 Ohm/cm) makes it possible to use simultaneously as a transparent electrode for collection of photo-generated electrical charge carriers. This might also invoke increasing the distance between screen-printed metal fingers at the front of the solar cell that would increase of the cell’s active area. Performed optical investigation showed that applied ITO thin film fulfill standard requirements according to antireflection properties when it was deposited on the surface of silicon solar cell. Design/methodology/approach Two sets of samples were prepared for comparison. In the first one, the ITO thin film was deposited directly on the crystalline silicon substrate with highly doped emitter region. In the second case, the TCO film was deposited on the same type of silicon substrate but with additional ultrathin SiO2 passivation. The fingers lines of 80 μm width were then screen-printed on the ITO layer with two different spaces between fingers for each set. The influence of application of the ITO electrode and the type of metal electrodes patterns on the electrical performance of the prepared solar cells was investigated through optical and electrical measurements. Findings The electrical parameters such as short-circuit current (Jsc), open circuit voltage (Voc), fill factor (FF) and conversion efficiency were determined on a basis of I-V characteristics. Short-circuit current density (Jsc) was equal to 32 mA/cm2 for a solar cell with a typical antireflection layer and 31.5 mA/cm2 for the cell with ITO layer, respectively. Additionally, electroluminescence of prepared cells was measured and analysed. Originality/value The influence of the properties of ITO electrode on the electrical performance of crystalline silicon solar cells was investigated through complex optical, electrical and electroluminescence measurements.

Review and Development of Crystalline Silicon Solar Cell with Intelligent Materials

2011 ◽  
Vol 321 ◽  
pp. 196-199
Author(s):  
Ying Lian Wang ◽  
Jun Yao Ye
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Crystalline Silicon ◽  
Clean Energy ◽  
Production Costs ◽  
Silicon Solar Cells ◽  
Human Society ◽  
Intelligent Materials ◽  
Crystalline Silicon Solar Cells ◽  
The Future

The application of solar cell has offered human society renewable clean energy. As intelligent materials, crystalline silicon solar cells occupy absolutely dominant position in photovoltaic market, and this position will not change for a long time in the future. Thereby increasing the efficiency of crystalline silicon solar cells, reducing production costs and making crystalline silicon solar cells competitive with conventional energy sources become the subject of today's PV market. The working theory of solar cell was introduced. The developing progress and the future development of mono-crystalline silicon (c-Si), poly-crystalline silicon (p-Si) and amorphous silicon (a-Si) solar cell have also been introduced.

Wet etching processes for recycling crystalline silicon solar cells from end-of-life photovoltaic modules

RSC Advances ◽  
2014 ◽  
Vol 4 (66) ◽  
pp. 34823-34829 ◽  
Author(s):  
Jongsung Park ◽  
Nochang Park
Keyword(s):  
Solar Cells ◽  
End Of Life ◽  
Crystalline Silicon ◽  
Wet Etching ◽  
Silicon Solar Cells ◽  
Crystalline Silicon Solar Cells ◽  
Photovoltaic Modules ◽  
Si Solar Cells

Chemical wafer recovering processes fabricate virgin-like c-Si wafers from degraded c-Si solar cells.

Novel Ag-doped glass frits for high-efficiency crystalline silicon solar cells

2017 ◽  
Vol 53 (46) ◽  
pp. 6239-6242 ◽  
Author(s):  
Sheng Yuan ◽  
Yongji Chen ◽  
Zongwei Mei ◽  
Ming-Jian Zhang ◽  
Zhou Gao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Contact Resistance ◽  
High Efficiency ◽  
Crystalline Silicon ◽  
Silicon Solar Cells ◽  
Crystalline Silicon Solar Cells ◽  
Si Solar Cells ◽  
Doped Glass

Novel Ag-doped glass frits remarkably improved the interface between bulk Ag and n-Si, which greatly reduced the contact resistance of c-Si solar cells.

Wafer-scale nanoconical frustum array crystalline silicon solar cells: promising candidates for ultrathin device applications

Nanoscale ◽  
2014 ◽  
Vol 6 (16) ◽  
pp. 9568-9573 ◽  
Author(s):  
Yunae Cho ◽  
Minji Gwon ◽  
Hyeong-Ho Park ◽  
Joondong Kim ◽  
Dong-Wook Kim
Keyword(s):  
Solar Cells ◽  
Crystalline Silicon ◽  
Silicon Solar Cells ◽  
Wafer Scale ◽  
Crystalline Silicon Solar Cells ◽  
Si Solar Cells ◽  
Surface Optical ◽  
Device Applications

A high photocurrent of 36.96 mA cm−2was achieved for wafer-scaled crystalline Si solar cells with hexagonal nanoconical frustum arrays at the surface. Optical simulations showed that the expected photocurrent of 10 μm thick nanostructured cells could slightly exceed the Lambertian limit.

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