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Polycrystalline Silicon Solar Cells:
A solar cell, is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Solar cells are the building blocks of photovoltaic modules, otherwise known as solar panels.
Polycrystalline Silicon Solar Cells Advantage:
• High efficiency and stable performance in photovoltaic conversion.
• Advanced diffusion technique ensuring the homogeneity of energy conversion efficiency of the cell.
• Advanced PECVD film forming, providing a dark blue silicon nitride anti-reflection film of homogenous color and attractive appearance.
• High quality metal paste for back surface and electrode, ensuring good conductivity, high pulling strength and ease of soldering.
• High precision patterning using screen printing, ensuring accurate busbar location for ease with automatic soldering a laser cutting.
Mechanical data and design
Format - 156 mm × 156 mm ± 0.5 mm
Thickness- - 200 μm ± 20 μm
Front (-) - 1.4 mm bus bars (silver),blue anti-reflection coating (silicon nitride)
Back (+) - 2 mm wide soldering pads (silver) back surface field (aluminium)
Temperature Coefficient of Cells
Voc. Temp .coef.%/K -0.364%/K
Isc . Temp .coef.%/K +0.077%/K
Pm. Temp. coef.%/K -0.368%/K
Efficiency (%) Pmpp (W) Umpp (V) Impp (A) Voc (V) Isc (A)
18.00% 4.380 0.538 8.141 0.634 8.740
17.90% 4.356 0.538 8.097 0.634 8.725
17.80% 4.331 0.537 8.065 0.633 8.710
17.70% 4.307 0.536 8.035 0.632 8.695
17.60% 4.283 0.535 8.006 0.631 8.680
17.50% 4.258 0.534 7.974 0.630 8.665
17.40% 4.234 0.533 7.944 0.629 8.650
17.30% 4.210 0.532 7.914 0.628 8.635
17.20% 4.185 0.531 7.88 -- 0.627 -- 8.620
17.10% 4.161 0.530 7.851 0.626 8.605
17.00% 4.137 0.529 7.820 0.625 8.590
Intensity [W/m2] Isc× [mA] Voc× [mV] Pmpp
1000 1.00 1.000 1.00
900 0.90 1.000 0.90
800 0.80 0.99 0.80
500 0.50 0.96 0.49
300 0.30 0.93 0.29
200 0.20 0.92 0.19
Usage of Polycrystalline Solar Cells
Solar cells are often electrically connected and encapsulated as a module. Photovoltaic modules often have a sheet of glass on the front (sun up) side, allowing light to pass while protecting the semiconductor wafers from abrasion and impact due to wind-driven debris, rain, hail, etc. Solar cells are also usually connected in series in modules, creating an additive voltage. Connecting cells in parallel will yield a higher current; our solar cells have passed IEC Certification. With high and stable quality, our cells can greatly improve the performance of Solar Modules.
Applications of Polycrystalline Solar Cells
Assemblies of photovoltaic cells are used to make solar modules which generate electrical power from sunlight, as distinguished from a "solar module" or "solar panel". A solar array generates solar power using solar energy.
Packaging & Delivery of Polycrystalline Solar Cells
Carton Box Package and Deliver by air. It should be noticed that it should be avoid of water, sunshine and moist.
Solar Panel Images：
We have organized several common questions for our clients，may help you sincerely：
①What price for each watt?
It depends on the efficiency of the solar cell, quantity, delivery date and payment terms.
②How long can we receive the product after purchase?
In the purchase of product within three working days, We will arrange the factory delivery as soon as possible. The pecific time of receiving is related to the state and position of customers.Commonly 7 to 10 working days can be served.
③Can you provide the peripheral products of the solar panels, such as the battery, controller, and inverter? If so, can you tell me how do they match each other?
Yes, we can, we have two companies for solar region, one is CNBM International, the other is CNBM engineering Co.
We can provide you not only the solar module but also the off grid solar system, we can also provide you service with on grid plant.
④What is your warranty of solar cell?
Our product can promise lower than 0.3% open box crack, we support claim after opening the box if it has crackm color difference or sth, the buyer should give pictures immediately, we can not accept the claim after the solar cell has assembled to solar panel.
• Timeliness of delivery
• ⑤How do you pack your products?
We have rich experience on how to pack the solar cell to make sure the safety on shipment, we could use wooden box or pallet as buyer's preference.
⑥ Can you do OEM for us?
Yes, we can.
Brief introduction of High Current Solar Cell
The output voltage of the high current solar cell must be calibrated high-voltage battery voltage. When the battery is fully charged, the controller disconnects the charging circuit. When the battery voltage is lower than the set voltage value, the charging circuit will re-open. Solar cells are to use light, when the charging is straight.
Slotted solar cells reduce the positive coverage, while expanding the contact electrodes, greatly improving the current collection, and thus obtain higher conversion efficiency.
Slotted solar cells due to process at the current level of processing technology and processing techniques should be relatively simple terms, it is the most suitable for large-scale industrial production, BP Spain UNSW use of technology has produced nearly a hundred since 1992 MW BCSC batteries, the main problem is to solve the industrialization process route design, and strict quality control of the production process.
Among the many aspects to consider in order slotting process and metallization process is most important, not only to the quality of the battery and cell conversion efficiency, but also a very strong impact on industrial productivity. Slotting process a variety of styles, laser, mechanical grooving, chemical corrosion, physical groove, etc., which have a mature technology; we can meet the design requirements. In particular it should be noted that the groove is formed BC battery key, groove, physical dimensions and surface state will very strongly affect battery performance parameters, in addition to metalization BC battery is a very important part, should arouse a high degree of seriously.
BCSC for monocrystalline silicon single-crystal silicon, should use high quality Cz silicon, should try to reduce the oxygen, and carbon content of heavy metal impurities, special emphasis is to select few defects, in order to ensure a higher wafer carrier lifetime.
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