Then they can no longer go back to their original low energy position and remain at a higher energy. The process of moving a light- generated carrier from p-type region to n-type region is called collection. These collections of carriers electrons can be either extracted from the device to give a current, or it can remain in the device and gives rise to a voltage. The electrons that leave the solar cell as current give up their energy to whatever is connected to the solar cell, and then re-enter the solar cell.
Once back in the solar cell, the process begins again:. The mechanism of electricity production- Different stages Conduction band High density. The above diagram shows the formation of p-n junction in a solar cell.
The valence band is a low-density band and conduction band is high-density band. Stage-1 When light falls on the semiconductor surface, the electron from valence band promoted to conduction band. Therefore, the hole vacancy position left by the electron in the valence band is generates. Hence, there is a formation of electron-hole pair on the sides of p-n junction. Stage-2 In the stage 2, the electron and holes are diffuse across the p-n junction and there is a formation of electron-hole pair.
Stage-3 In the stage 3, As electron continuous to diffuse, the negative charge build on emitter side and positive charge build on the base side. Advantage, disadvantage and application of Solar cell Advantage 1.
It is clean and non-polluting 2. It is a renewable energy 3. Solar cells do not produce noise and they are totally silent. They require very little maintenance They are long lasting sources of energy which can be used almost anywhere They have long life time There are no fuel costs or fuel supply problems. Soar power can be obtained in night time 2. Soar cells or solar panels are very expensive 3.
Energy has not be stored in batteries 4. Air pollution and whether can affect the production of electricity. Domestic power supply for appliances include refrigeration, washing machine, television and lighting 1. Ocean navigation aids: Number of lighthouses and most buoys are powered by solar cells 1.
Telecommunication systems: radio transceivers on mountain tops, or telephone boxes in the country can often be solar powered 1. Electric power generation in space: To providing electrical power to satellites in an orbit around the Earth Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks. Bestsellers Editors' Picks All Ebooks. Explore Audiobooks. Bestsellers Editors' Picks All audiobooks.
Explore Magazines. The formamidinium lead trihalides and methylammonium lead trihalides have been made by availing a variety of solvent methods and vapor deposition methods; they have the strength of scaling up with relative feasibility. In one step solution processing, a methylammonium halide and lead halide can be dissolved in a solvent and can be spin coated onto a substrate.
Due to the steps like convective self-assembly and subsequent evaporation at the time of spinning results in dense layers. It results in the dense layers of well-crystallized perovskite material because of the powerful ionic interactions within the material. The simple coating of spin does not result in homogeneous layers but need the addition of other layers like DMSO, GBL, and toluene drips. Other method availing room solvent-solvent extraction generates high-quality crystalline films with the accurate control over thickness down to 20nm.
In the other solution processed method, a mixture of methylammonium halide and lead iodide dissolved in DMF is preheated. In the methods of vapor assisted, exfoliated or spin coated lead halide is annealed in the presence of methylammonium iodide vapor and this method maintains the temperature of around degrees centigrade.
N-type P-type Single Solar cell 5. The two layers are sandwiched and hence there is formation of p-n junction. Types of Solar Cell Based on the types of crystal used, soar cells can be classified as, 1.
Monocrystalline silicon cells 2. Polycrystalline silicon cells 3. Amorphous silicon cells 1. The Monocrystalline silicon cell is produced from pure silicon single crystal. Since the Monocrystalline silicon is pure and defect free, the efficiency of cell will be higher. In polycrystalline solar cell, liquid silicon is used as raw material and polycrystalline silicon was obtained followed by solidification process.
The materials contain various crystalline sizes. Hence, the efficiency of this type of cell is less than Monocrystalline cell. Amorphous silicon was obtained by depositing silicon film on the substrate like glass plate. Second Generation — Thin Film Cells Total views 42, On Slideshare 0. From embeds 0. Number of embeds Downloads 1, Prabir Kumar Pati.
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