scholarly journals Efficiency Improved byH2Forming Gas Treatment for Si-Based Solar Cell Applications

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Yuang-Tung Cheng ◽  
Jyh-Jier Ho ◽  
William Lee ◽  
Song-Yeu Tsai ◽  
Liang-Yi Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Fill Factor ◽  
Internal Quantum Efficiency ◽  
Major Effect ◽  
Gas Treatment ◽  
Solar Cell Performance ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Commercial Applications

The photovoltaic (PV) effects have been investigated and improved using efficient treatments both on single-crystalline (sc) and on multicrystalline (mc) silicon (Si) solar cells. The major effect of forming gas (FG) treatment on solar cell performance is the fill-factor values, which increase 3.75% and 8.28%, respectively, on sc-Si and mc-Si solar cells. As for the optimal 15%-H2ratio and 40-minute FG treatment, the conversion efficiency (η) values drastically increase to 14.89% and 14.31%, respectively, for sc- and mc-Si solar cells. Moreover, we can measure the internal quantum efficiency (IQE) values increase withH2-FG treatment under visible wavelength (400~900 nm) radiation. Thus based on the work in this research, we confirm thatH2passivation has become crucial both in PV as well as in microelectronics fields. Moreover, the developed mc-Si solar cell by properH2FG treatment is quite suitable for commercial applications.

scholarly journals Analytical Study of the Electrical Output Characteristics of c-Si Solar Cells by Cut and Shading Phenomena

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3397 ◽  
Author(s):  
Jong Lim ◽  
Woo Shin ◽  
Hyemi Hwang ◽  
Young-Chul Ju ◽  
Suk Ko ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Crystalline Silicon ◽  
Short Circuit ◽  
Incident Light ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Electrical Output

Cut solar cells have received considerable attention recently as they can reduce electrical output degradation when the c-Si solar cells (crystalline-silicon solar cells) are shaded. Cut c-Si solar cells have a lower short-circuit current than normal solar cells and the decrease in short-circuit currents is similar to the shading effect of c-Si solar cells. However, the results of this study’s experiment show that the shadow effect of a c-Si solar cell reduces the V o c (open circuit voltage) in the c-Si solar cell but the V o c does not change when the c-Si solar cell is cut because the amount of incident light does not change. In this paper, the limitations of the electrical power analysis of the cut solar cells were identified when only photo current was considered and the analysis of the electric output of the cut c-Si solar cells was interpreted with a method different from that used in previous analyses. Electrical output was measured when the shaded and cut rates of c-Si solar cells were increased from 0% to 25, 50 and 75%, and a new theoretical model was compared with the experimental results using MATLAB.

scholarly journals Water-soluble ZnSe/ZnS:Mn/ZnS quantum dots convert UV to visible light for improved Si solar cell efficiency

2021 ◽  
Author(s):  
Hisaaki Nishimura ◽  
Takaya Maekawa ◽  
Kazushi Enomoto ◽  
Naoteru Shigekawa ◽  
Tomomi Takagi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Visible Light ◽  
Solar Spectrum ◽  
Water Soluble ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Si Solar Cell ◽  
Si Solar Cells

The sensitivity of Si solar cells to the UV portion of the solar spectrum is low, and must be increased to further improve their efficiencies.

Recent Advances in A-Si Solar Cell Technology in Japan

1986 ◽  
Vol 70 ◽  
Author(s):  
Y. Kuwano
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Single Junction ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Recent Advances ◽  
Cell Structures ◽  
Cell Stability ◽  
Terminal Structure ◽  
Conversion Efficiencies

ABSTRACTRecent advances in a-Si solar cells in Japan are reviewed. Improvements in single-junction and multi-junction solar cells are described in three main points, namely, fabrication methods, materials, and cell structures. Recently, a conversion efficiency of 11.7% was obtained for a single-junction structure. For an a-Si/poly-Si stacked structure and an a-Si/(CdS/CdTe) 4 terminal structure, conversion efficiencies of more than 13% were achieved.Then recent advances in the prevention of the light induced degradation of a-Si solar cells is mentioned. Several methods which can improve the a-Si solar cell stability are described.Finally, the present status of the industrialization of a-Si solar cells and some of the latest applications are described together with their propects.

Efficient Thin-Film Polycrystalline-Silicon Solar Cells Based on Aluminium-Induced Crystallization

2007 ◽  
Vol 989 ◽  
Author(s):  
Ivan Gordon ◽  
Lode Carnel ◽  
Dries Van Gestel ◽  
Guy Beaucarne ◽  
Jef Poortmans
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Current Density ◽  
Polycrystalline Silicon ◽  
Cell Process ◽  
Cell Efficiency ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Induced Crystallization

AbstractEfficient thin-film polycrystalline-silicon (pc-Si) solar cells on inexpensive substrates could lower the price of photovoltaic electricity substantially. At the MRS conference in 2006, we presented a pc-Si solar cell with an efficiency of 5.9% that had an absorber layer made by aluminum-induced crystallization (AIC) of amorphous silicon followed by high-temperature epitaxial thickening. The efficiency of this cell was mainly limited by the current density. To obtain higher efficiencies, we therefore need to implement an effective light trapping scheme in our pc-Si solar cell process. In this work, we describe how we recently enhanced the current density and efficiency of our cells. We achieved a cell efficiency of 8.0% for pc-Si cells in substrate configuration. Our cell process is based on pc-Si layers made by AIC and thermal CVD on smoothened alumina substrates. The cells are in substrate configuration with deposited a-Si heterojunction emitters and interdigitated top contacts. The front surface of the cells is plasma textured which leads to an increase in current density. The current density is further enhanced by minimizing the back surface field thickness of the cells to reduce the light loss in this layer. Our present pc-Si solar cell efficiency together with the fast progression that we have made over the last few years indicate the large potential of pc-Si solar cells based on the AIC seed layer approach.

scholarly journals The Viability of Organic Dyes in Luminescent Down-Shifting Layers for the Enhancement of Si Solar Cell Efficiency

2020 ◽  
Vol 995 ◽  
pp. 71-76
Author(s):  
Aaron Glenn ◽  
Conor Mc Loughlin ◽  
Hind Ahmed ◽  
Hoda Akbari ◽  
Subhash Chandra ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Organic Dyes ◽  
Polyvinyl Butyral ◽  
High Energy ◽  
Silicon Solar Cells ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Si Solar Cell ◽  
Si Solar Cells

The main energy losses in solar cells are related to spectral losses where high energy photons are not used efficiently, and energy is lost via thermalization which reduces the solar cell’s overall efficiency. A way to tackle this is to introduce a luminescent down-shifting layer (LDS) to convert these high energy photons into a lower energy bracket helping the solar cell to absorb them and thus generating a greater power output. In this paper, lumogen dye Violet 570 has been used as LDS coated films of 10μm and 60μm placed on top of Si solar cells. The dye was incorporated into polymer films of Polyvinyl Butyral (PVB) and Polymethyl Methacrylate (PMMA) after which they were tested for their absorption, transmission and emission properties. Once optimised layers had been determined, they were deposited directly onto silicon solar cells and the external quantum efficiency (EQE) of the Si solar cells were measured with and without the LDS layers. The resulting graphs have shown an increase of up to 2.9% in the overall EQE efficiency after the lumogen films had been applied.

Antireflection Layer Coatings on the Si Solar Cell Using SiO2 and Si3N4

2004 ◽  
Vol 449-452 ◽  
pp. 1013-1016 ◽  
Author(s):  
Gee Keun Chang
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Refractive Indices ◽  
Optimum Conditions ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Effective Absorption ◽  
First Time ◽  
Absorption Power ◽  
Ar Coating

With new models of AM1 solar spectra and Si refractive indices in the wavelength range of 0.4 0.97 , effective absorption powers of Si solar cells coated with the single and double AR layers were theoretically calculated for the first time. The SiO2, Si3N4 and SiO2/Si3N4 easily obtainable in the standard Si process were used as the AR layers of Si solar cell. Optimum thicknesses showing the maximum absorption power for AR layers of SiO2, Si3N4 and SiO2/Si3N4 were as follows: d(SiO2)=10001, d(Si3N4)=7001 and d(SiO2/Si3N4) =500 1 /3001 . Effective absorption powers in the solar cells of SiO2-Si, Si3N4-Si and SiO2/Si3N4-Si were 520W/m2, 565W/m2 and 607W/m2 at AM1 in the optimum conditions of AR coating, respectively

High-Speed Deep-Level Luminescence Imaging in Multicrystalline Si Solar Cells

2012 ◽  
Vol 725 ◽  
pp. 149-152 ◽  
Author(s):  
Futoshi Okayama ◽  
Michio Tajima ◽  
Hiroyuki Toyota ◽  
Atsushi Ogura
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Exposure Time ◽  
High Speed ◽  
Deep Level ◽  
Selective Detection ◽  
High Speed Imaging ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Band Pass

We demonstrated high-speed imaging of photoluminescence (PL) and electroluminescence (EL) for not only band-to-band but also multiple deep-level emissions in a multicrystalline Si solar cell. We used a cooled InGaAs camera with a photosensitive range of 900 - 1700 nm equipped with band-pass filters for the selective detection of various deep-level emissions. The exposure time for imaging was only 1 - 10 seconds. Comparisons of the present PL images with the microscopic PL mappings confirmed for us that essentially the same luminescence patterns were obtained.

A facile method to evaluate the influence of trap densities on perovskite solar cell performance

2019 ◽  
Vol 7 (19) ◽  
pp. 5646-5651 ◽  
Author(s):  
Bingbing Chen ◽  
Hongwei Hu ◽  
Teddy Salim ◽  
Yeng Ming Lam
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Fill Factor ◽  
Perovskite Solar Cell ◽  
Cell Performance ◽  
Trap Density ◽  
Solar Cell Performance ◽  
Light Intensities ◽  
Current Voltage

This work discusses how the behaviour of the fill factor (FF) of devices calculated from current–voltage (I–V) measurements at different light intensities can be used as a basis to assess the trap density of methylammonium lead triiodide (MAPbI3) solar cells.

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