Amorphous silicon dice specification 2

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Pv modules at present, the mainstream products are still in silicon as the main raw materials, only in terms of silicon raw material consumption, production 1 mw of crystalline silicon solar cell, need 10 to 12 tons of high purity silicon, but if use the same silicon materials used to produce thin film amorphous silicon solar cell can produce more than 200 mw.

From the perspective of energy consumption, amorphous silicon solar battery only 1-1.5 years of energy recovery period, more embodies its contribution to energy saving in the manufacturing process.

Component occupies a high proportion of costs in a photovoltaic system, the component prices directly affect the system cost, and thus affect the cost of photovoltaic power generation. Calculated at the current price of components, the same money, buy amorphous silicon products, you can get more close to 30% of the power components.

2, more power

For the same power of solar cell array, amorphous silicon solar cell is about 10% more than monocrystalline silicon, polycrystalline silicon battery power. This has been the Uni - Solar System LLC, Energy Photovoltaic Corp., Japan's Kaneka Corp., the Netherlands Energy research institute, and other organizations and experts confirmed that the Photovoltaic industry.

In sunny, that is to say, under the high temperature, amorphous silicon solar cell components can show more excellent power performance.


3, better low light response

Due to the characteristics of amorphous silicon atoms are arranged disorderly, the electron transition no longer comply with the restriction of traditional \"selection rule\", as a result, its light absorption characteristics and there are big differences monocrystalline silicon material. Amorphous silicon and monocrystalline silicon material absorption curve as shown

, amorphous silicon absorption curve has obvious three sections (A, B, C). Area A corresponding electronic transition between localized states, such as the gap state near Fermi level and to the tail state transition, the absorption coefficient is small, about 1-10 cm - 1, for this is absorbing; B area absorption coefficient with the increase of the photon energy index rose, it corresponds to the electrons from the valence band edge extension state to the conduction band localized state transition, as well as the localized electrons from the valence band tail states guide for edge extension state transition, the region's energy range is usually only about half of the electron volts, but absorption coefficient across two or three orders of magnitude, usually up to 104 cm - 1; Area C corresponds to the electrons from the valence band to the conduction band internal internal transition, the absorption coefficient is bigger, often in more than 104 cm - 1. After two absorption area is crystalline silicon eigen absorption area.

Can be seen in the figure, the intersection of two curves about 1.8 ev. It is important to note that in the visible light range (1.7 to 3.0 ev), the absorption coefficient of amorphous silicon material is almost an order of magnitude larger than the single crystal silicon. That is to say, in the morning the first part of the sun is not too strong, the second half, and it's cloudy in the afternoon under the condition of low light intensity, long wave is greater, the amorphous silicon material still has a large absorption coefficient. Again considering the amorphous silicon band gap is larger, the reverse saturation current I0 is smaller. And as mentioned the amorphous silicon battery the characteristics I - V characteristic curve of the amorphous silicon solar cell both in theory and in practical use in low light intensity has good adaptation.

• I - V characteristics of amorphous silicon cells after more than a Vm with the voltage drop slowly


In order to be convenient, we draw the I - V characteristics of two kinds of batteries on the same picture. Crystalline silicon and amorphous silicon battery I - V characteristics of general shape as shown

 we see from the picture, two kinds of cells in the curve changes after exceed the maximum output power point gap is bigger. Output current of crystalline silicon cells after exceed the maximum output power point will soon fall to zero, curve steep; Rather than crystalline silicon cells output current after a long distance to fall to zero, the curve is relatively flat. Two kinds of battery Vm equivalent to about 83% of its open circuit voltage and 83% respectively.

 when light intensity gradually become hour, short circuit current and open circuit voltage of solar battery will be stronger. Short circuit current decreases faster, of course, open circuit voltage decrease more slowly.

 do in battery solar cell array under the condition of load, when the sun battery array of effective output voltage less than the terminal voltage of battery, battery cannot be recharged. When the light intensity gradually become hour, crystal silicon battery charging does not meet the conditions, and amorphous silicon due to the larger voltage difference, do not charge until the light is very dark, effectively increase the use of sunlight time. So, amorphous silicon cells to produce more electricity than the crystalline silicon.

4, more excellent high temperature performance

High in the outdoor environment temperature, amorphous silicon solar cell performance change, depends on the temperature, spectrum, as well as other related factors. But what is certain is: amorphous silicon than monocrystalline silicon or polycrystalline silicon are less likely to be affected by temperature.

Amorphous silicon solar cells than monocrystalline silicon, polycrystalline silicon cells have relatively small temperature coefficient of amorphous silicon solar cell output power best Pm temperature coefficient is about 0.19%, and monocrystalline silicon, polycrystalline silicon cells best output power Pm temperature coefficient is about 0.5%, when the battery work at higher temperatures, the two batteries will be a drop in the Pm, but the decline is different. They can be calculated using the following formula.


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Q:How to avoid or reduce the fragmentation of thin silicon wafers without wax polishing?
You can use the U.S. ZeroMicron wax free polishing template to solve the problem of non wax polishing fragments
Q:The production of silicon units do front-line production workers harmful to the body
There are still some damage, some of the silicon wafer plant dust, strong acid, alkali, more depends on the configuration of the factory environment and labor insurance supplies
Q:One hundred watts of solar panels to how many pieces of silicon wafers, 156 of single crystals and polycrystalline
This is not with the number of pieces, crystal silicon solar cell has a feature that is a 0.48-0.6V, called 0.5V, how much you want to V, you can use serial or parallel connection to achieve
Q:Seeking for the video: manual insert silicon wafer single crystal insert method
To solve the finger print is very simple, as long as the requirements of employees can not in the whole process of operation of the silicon bare hand contact can be, no debris is not possible, but to see the machine or man-made debris or before the procedure is cracked as, if it is man-made debris, to do a a standard specification, as long as the control that would reduce the rate of fragmentation. Or artificial debris to staff assessment, but also meet the results. I used to track debris for a long time, when all of the pieces are controlled by the descendants of the debris is very low. The main road is the most hidden crack. If the semi automatic equipment under normal circumstances will not produce debris, such as automatic equipment, such as degumming equipment will produce debris, mainly the spray pressure is too large, but the pressure is also very little fragmentation of the right. I think the main thing is to see if you have asked the staff how to do it, followed by the implementation of your employees are required. You can look at these lines on the line!
Q:How much is the thickness of the silicon wafer
And two knives. We do DIP package, 4 inch wafer to thin to 0.300mm; 6 inch wafer to be reduced to about 0.320mm, error 0.020mm.
Q:Why do you want to make the wafer bigger?
Because each layer is insulated by silicon dioxide, it is equivalent to a capacitor structure. The larger the span, the greater the capacity of the wiring. The higher the frequency, the more serious side effects such as the integral effect of the long distance transmission. Basically thought GHz must use the following line width.18 technology. Chip size also affects power consumption. With the same mask and the same operating frequency, the smaller the line width, the smaller the voltage. The power consumption is proportional to the square of the voltage. Want to pursue low power you have to honestly narrow the line width. The semiconductor industry in the world are going to kill red eye, if we do not have shortcut yiwofeng to dive in.
Q:What is the difference between the purpose of wafer cleaning and the cleaning of silicon material, what is the difference between the acid used
You say that the silicon wafer cleaning is not the same as that of the silicon material, and the silicon material is washed with hydrofluoric acid
Q:Why do you use a concentrated sulfuric acid and hydrogen peroxide to wash silicon?
But it is best not to use, the use of water under normal conditions and these two kinds of things can be caustic clean silicon, 100% recycled mortar is not the problem, but this requires tens of thousands of cost and appropriate design, I am clean
Q:How to extract silicon from silicon wafers
Annealing: double position hot oxidation furnace after nitrogen purging, infrared heating to 300~500 DEG C, silicon wafer surface and oxygen react, so that the surface of silicon dioxide protection layer.
Q:How many watts can a piece of silicon produce
The content of silicon in the earth's crust is 25.8%, which provides an inexhaustible source for the production of monocrystalline silicon. Because silicon is one of the most abundant elements in the earth, the solar battery that destined to enter the mass market (mass market) products, reserves of advantage is to become one of the reasons the main photovoltaic silicon materials.

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