Why is the efficiency of solar cell materials made of Si material lower than that of GaAs?

Why is it similar to some of the sun's words, well, some of the battery materials still have to have a requirement, he into the whispering one.

The photosensitive band gap of Gaas photovoltaic cells is wider than that of silicon, making its spectral responsiveness and solar spectral matching ability better than that of silicon solar energy.

The sensitivity of silicon solar cells to temperature is much higher than that of Gaas, the surface temperature of silicon solar cells will drop by about 5% for every 10 ° increase in temperature from 25 °, and the proportion of voltage drop will increase with the increase of temperature, when the temperature exceeds 200 °, the silicon cell can no longer work, and the Gaas battery with germanium substrate can still work normally at 250 °, so GaAs cells are mostly used in aerospace and ground concentrating photovoltaics.

In space applications, the efficiency of the three-junction gallium arsenide cell has reached more than 32, and the laboratory has exceeded 47, and the conversion efficiency of the ground three-junction gallium arsenide 1000 times concentrating has reached or exceeded 45, and the laboratory conversion efficiency has exceeded 55

Hope, thank you.

Why is it inefficient for me to make solar cells from SI material? It's because of low energy.

Why don't you understand the efficiency of solar cell materials made by Ace Materials?

For why the efficiency of solar cell materials made of S materials bsassd master, he is not the same material.

Factors:

1. Solar light intensity:

A solar cell is a device that converts sunlight into electricity, and in general (pay attention to the conditions), the efficiency of the solar cell increases with the increase of light intensity. Furthermore, the efficiency of solar cells is related to the comprehensive climatic conditions of the place where they are installed.

2. Battery material:

Different materials have different absorption coefficients for light, different band gaps, different quantum efficiency, and different cell efficiency. Generally speaking, the coefficient coefficient of monocrystalline silicon and polycrystalline silicon to light is much smaller than that of amorphous silicon, so the thickness of amorphous silicon solar cells is only one percent of the thickness of monocrystalline silicon and polycrystalline silicon to absorb sunlight better.

The main role of cells is to generate electricity, and the mainstream in the power generation market are crystalline silicon solar cells and thin-film solar cells, both of which have their own advantages and disadvantages. Crystalline silicon solar cells, the equipment cost is relatively low, but the consumption and cell cost are very high, but the photoelectric conversion efficiency is also high, and it is more suitable for generating electricity in outdoor sunlight;

Thin-film solar cells, relative to the cost of equipment is higher, but the cost of consumption and battery is very low, but the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but the weak light effect is very good, and it can also generate electricity under ordinary lights, such as solar cells on the calculator.

The above content reference: Encyclopedia - Solar panels.

There are many defects in the battery, and a large part of the photogenerated carriers are recombined with the defects as the center. Then the light decay of the battery is more serious.

1. Limitations of the theory: (1) the theory of atomic structure; (2) Electron theory: (3) Photon theory.

2. Technical limitations: incorrect understanding of the photoelectric conversion mechanism, so the process is not suitable for light energy to electrical energy conversion, and the efficiency is low.

leeyinghua2

The solar photovoltaic is a collection of a series of different wavelengths of light, and only photons of a specific wavelength in a certain range can fit into a specific solar material (silicon, compound, etc.), that is, the conditions for excitation of electrons are satisfied, which is a part of the loss. Then, after the photons that meet the excitation conditions excite the electrons, they are greatly affected by the defects and impurities in the material during the collection process.

There are no good materials, no innovative technologies, no new theoretical support.

It may be that I haven't found a good conversion carrier.

You are wrong!

Zheng Yu Qi said that the same area of solar panels, the lower the power, the lower the efficiency! The higher the power, the higher the efficiency!

For example, a 2x1 meter solar panel, its power can be 250w-300w, the efficiency of 250w is definitely low, and the efficiency of 300w is high;

A 1-meter solar panel, its power rate can be 220w-250w, where the efficiency of 250w is the highest, even higher than the efficiency of the above 300w; But in fact, the 2-meter board can even achieve 320W, which is more efficient than 250W per meter.

The operating ambient temperature of a solar cell can vary over a wide range. The short-circuit current of a battery is not strongly dependent on temperature. As the temperature rises, the short-circuit current increases slightly, but the open-circuit voltage and fill factor decrease, so the total effect of the temperature increase on the battery is to reduce the efficiency and reduce the output power.

The output power of a monocrystalline silicon solar cell decreases for every degree of temperature increase, but the Gaas cell is only half as sensitive to temperature changes as a silicon cell. Therefore, in order to get a large power output, solar cells are more suitable for working at lower temperatures.

Monocrystalline silicon silicon has two allotropic forms: crystalline and amorphous. Crystalline silicon is divided into monocrystalline silicon and polycrystalline silicon, which all have diamond lattice, hard and brittle crystals, metallic luster, and can conduct electricity, but the conductivity is not as good as that of metal, and increases with the increase of temperature, and has semiconductor properties.

Monocrystalline silicon is an indispensable basic material in modern science and technology such as electronic computers and automatic control systems in daily life. Televisions, computers, refrigerators, watches, automobiles, are inseparable from monocrystalline silicon materials everywhere, and monocrystalline silicon, as one of the popular materials for scientific and technological applications, has penetrated into all corners of people's lives.

PolysiliconPolysilicon is a form of elemental silicon. When molten elemental silicon solidifies under supercooling conditions, the silicon atoms are arranged into many crystal nuclei in the form of a diamond lattice, and if these crystal nuclei grow into grains with different crystal plane orientations, these grains combine to crystallize into polysilicon. Polysilicon can be used as a raw material for drawing monocrystalline silicon, and the difference between polysilicon and monocrystalline silicon is mainly manifested in physical properties.

For example, in terms of anisotropy in mechanical, optical and thermal properties, it is far less obvious than monocrystalline silicon; In terms of electrical properties, the conductivity of polycrystalline silicon crystals is also much less significant than that of monocrystalline silicon, or even almost no conductivity. In terms of chemical activity, the difference between the two is minimal. Polycrystalline silicon and monocrystalline silicon can be distinguished by appearance, but the real identification must be determined by analysis to determine the crystal plane orientation, conductivity type, and resistivity.

Uses: It is a raw material for the manufacture of semiconductor silicon devices, which is used to make high-power rectifiers, high-power transistors, diodes, switching devices, etc.

1) Monocrystalline silicon solar cells.

At present, the photoelectric conversion efficiency of monocrystalline silicon solar cells is about 17%, and the highest reaches 24, which is the highest photoelectric conversion efficiency among all kinds of solar cells at present, but the production cost is very large, so that it can not be widely and widely used in large quantities. Since monocrystalline silicon is typically encapsulated with tempered glass and waterproof resin, it is robust and durable, with a service life of up to 25 years.

2) Polycrystalline silicon solar cells.

The manufacturing process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, but the photoelectric conversion efficiency of polycrystalline silicon solar cells is much lower, and its photoelectric conversion efficiency is about 15. In terms of production cost, it is cheaper than monocrystalline silicon solar cells, and the materials are easy to manufacture, save electricity consumption, and the total production cost is low, so it has been developed a lot. In addition, polycrystalline silicon solar cells also have a shorter lifespan than monocrystalline silicon solar cells.

In terms of performance, monocrystalline silicon solar cells are slightly better.

3) Amorphous silicon solar cells (thin-film solar cells).

Amorphous silicon solar cell is a new type of thin-film solar cell that appeared in 1976, it is completely different from the manufacturing method of monocrystalline silicon and polycrystalline silicon solar cell, the process is greatly simplified, the silicon material consumption is very small, the power consumption is lower, and its main advantage is that it can generate electricity in low light conditions. However, the main problem of amorphous silicon solar cells is that the photoelectric conversion efficiency is low, which is about 10 at the international advanced level, and it is not stable enough, and its conversion efficiency decays with the extension of time.

There are several main reasons for this:

1.A technical issue, of course.

2.Solar energy includes both light energy and heat energy, and now solar cells either absorb light energy or heat energy, and few light energy and heat energy absorb together.

3.Even if light and heat are absorbed at the same time, a large part of the light will be reflected4The energy absorbed by the solar cell will also be lost during the conversion process, which is the reason for the low solar conversion efficiency.

The existing battery panel needs higher energy to convert light energy into electrical energy, that is to say, the threshold is high, many photons with lower energy can not participate in the conversion, and the factor of the material itself, the utilization rate of light by plants can reach more than 90%, and the future battery panel may be able to do it.

It's not a problem with conversion equipment, it should be an energy storage device, which is volatile.

Because the sun is so far away from us, the distribution of solar energy on the earth is too small, and besides, it doesn't necessarily shine vertically on the earth, but this is not the case, the sun is really not very large, unless there is a very large solar panel.

Patented technology for solar cells.

1. Semiconductor components, especially solar cells and their manufacturing processes 2. Photocells including porous semiconductor layers, their production methods and solar cells 3.

4. Thin-film polycrystalline solar cells and their formation methods.

5. Thin-film solar cells.

6. Color solar cell unit.

7. Method for processing thin crystalline silicon wafers and crystalline silicon solar cells 8. Process of crude etching silicon solar cells.

9. Surface structure of monocrystalline silicon solar cell and manufacturing method thereof 10. Installation structure of single-column overhead solar cell.

The working principle of solar cells is to use photoelectric materials to absorb light energy and then undergo a photoelectric conversion. The most basic is the conversion of solar energy into electrical and chemical energy through photosensitive materials. Holes are formed after the semiconductor material absorbs photons electron pairs, and after the electrons are injected into the semiconductor material as an acceptor, the holes and electrons are separated.

In this system, the electron donor is of the p-type and the electron acceptor is of the n-type, so that the holes and electrons are transported to the two electrodes, respectively, to form a photocurrent.

According to the different materials used, solar cells can be divided into: 1. Silicon solar cells; 2. Batteries made of inorganic salts such as gallium arsenide III-V compounds, cadmium sulfide, copper indium selenium and other compounds; 3. Large solar energy battery prepared by functional polymer materials; 4. Nano crystalline solar cells, etc.

No matter what kind of material is used to make the battery, the general requirements for solar cell materials are: 1. The band gap of semiconductor materials should not be too wide; It is necessary to have a high photoelectric conversion efficiency: 3. The material itself does not cause pollution to the environment; 4. The material is convenient for industrial production and the material performance is stable.

There are many factors that affect the conversion efficiency, and the key point is whether it is easy to generate hole electron pairs.

Analysis of the development path of the global new energy vehicle industry.

The most important components of new energy electric vehicles are power batteries, motors and energy conversion control systems, and power batteries should achieve high performance such as fast charging and safety, which is the part with the highest technical threshold and the most concentrated profits. Li Shengmao, a researcher in the new energy vehicle industry at CIC Consulting, pointed out that new energy vehicles have high requirements for batteries, which must have high specific energy, high specific power, fast charging and deep discharge performance, and require as low cost and long service life as possible.

According to the "2009-2012 China Battery Industry Investment Analysis and Prospects" report released by CIC Consultants, new energy vehicles will develop towards the industrialization path of "nickel-metal hydride-lithium battery-fuel cell". The immaturity of lithium iron phosphate batteries and the new standards for new energy vehicle access issued by the Ministry of Industry and Information Technology also make nickel-metal hydride battery manufacturers see the hope of the short and medium term. However, within 3-5 years, after the lithium battery technology matures, the nickel-metal hydride battery market will be gradually eroded by lithium batteries.

In addition, the rapid development of fuel cell (FC) technology in recent years has made the dream of hydrogen energy a reality in the 21st century. It is expected that in the next 5-10 years, FCV will officially enter the market, and the "hydrogen economy" marked by the construction of hydrogen refueling stations and hydrogen pipelines has begun to emerge.

The study found that Japan's lithium battery manufacturers have a large dominant position, and have begun to formulate unified lithium battery specifications, safety standards, and charging methods. In order to prevent itself from becoming dependent on imported oil into dependence on foreign lithium batteries, the United States is also supporting electric vehicles and lithium battery manufacturers, and the U.S. Department of Energy also approved a $25 billion loan last year. In contrast, although European auto companies are very aggressive in green, energy-saving and environmental protection, or even more radical, they have more obvious advantages in improving traditional engines (such as making them "miniaturized", using gasoline and diesel direct injection technology, etc.), or hydrogen-powered vehicles.

Check out the Gerun clean energy network.