We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. As soon as the solar cell is exposed to sunlight, the solar energy which is present in the form of light photons is absorbed by semi conductor materials. It is used to power calculators and wrist watches. A solar energy plant produces megawatts of electricity. Similarly, the holes in the depletion can quickly come to the p-type side of the junction. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Silicon. Just below the p-type layer there is a p-n junction. When light energy strikes the solar cell, electrons are knocked loose from the atoms in the semiconductor material. The material requirements would be enormous but feasible, as silicon is the second most abundant element in Earth’s crust. If we connect a small load across the junction, there will be a tiny current flowing through it. When light interacts with a silicon cell, it causes electrons to be set into motion, which initiates a flow of electric current. Conclusion: Though solar cell has some disadvantage associated it, but the disadvantages are expected to overcome as the technology advances, since the technology is advancing, the cost of solar plates, as well as the installation cost, will decrease down so that everybody can effort to install the system. A commonly used solar cell structure. Typically voltage-current characteristics are shown in the figure at two different solar radiation levels, for each of which Voc = open-circuit voltage, Isc = short-circuit current. ­Photovoltaic cells are made of special materials called semiconductors such as silicon, which is currently used most commonly. The raw material must be available in abundance and the cost of the material must be low. In the UK, there is a strong focus on green energy and especially solar cells, which can contribute to lowering CO2 emissions in everyday life, while minimising your electricity bill. During cloudy day, the energy cannot be produced and also at night we will not get. The sun’s photons strike the cell on the microthin p-side and penetrate to the junction to generate the electron-hole pairs. The materials used to construct the various layers of solar cells are essentially the same as those used to produce the diodes and transistors of solid-state electronics and microelectronics (see also electronics: Optoelectronics). Silicon (atomic #14 on the periodic table) is a nonmetal with conductive properties that allow it to absorb and convert sunlight into electricity. PelesTears October 29, 2010 @ Cougars- The silicon based solar cells that are so common today have only been around since the early fifties. Silicon offers some significant advantages, including: Long Lifespan; Abundance and availability; Affordability; Superior efficiency; It has the most widespread use in the industry and the type you’ll most likely see in a broad range of applications. Currently, over 90% of the current solar cell market is based on silicon. Solar cells are a form of photoelectric cell, defined as a device whose electrical characteristics – such as current, voltage, or resistance – vary when exposed to light. The DC current is converted into 240-volt AC current using an inverter for different applications. While total photovoltaic energy production is minuscule, it is likely to increase as fossil fuel resources shrink. The light energy, in the form of photons, supplies sufficient energy to the junction to create a number of electron-hole pairs. This sequence of converting the energy in light into the energy of excited electrons and then into stored chemical energy is strikingly similar to the process of photosynthesis. The free electrons in the depletion region can quickly come to the n-type side of the junction. Once, the newly created free electrons come to the n-type side, cannot further cross the junction because of barrier potential of the junction. These factors have led solar proponents to envision a future “solar economy” in which practically all of humanity’s energy requirements are satisfied by cheap, clean, renewable sunlight. That's a basic introduction to solar cells—and if that's all you wanted, you can stop here.The rest of this article goes into more detail about different types of solar cells, howpeople are putting solar power to practical use, and why solar energy is taking such a long time tocatch on. In effect, the electric field gives a collective motion to the electrons that flow past the electrical contact layers into an external circuit where they can do useful work. Light enters the device through an optical coating, or antireflection layer, that minimizes the loss of light by reflection; it effectively traps the light falling on the solar cell by promoting its transmission to the energy-conversion layers below. June 07, 2019. Negatively-charged electrons are knocked off from their atoms and start flowing in the same direction to produce electric current. How Does a Photovoltaic Cell Work? Once the solar energy falls on a solar panel, then it absorbs. When these photons collide with valence electrons’. Energy from the sun is the most abundant, and absolutely freely available energy on planet earth. Protons are positively charged and electrons are negatively charged. Cell is pure silicon, hybrid silicon solar cells and how do they work provide a current electrode... 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