Solar Energy: The Physics and Engineering of Photovoltaic Conversion, Technologies and Systems by Arno Smets at al. See all formats and editions Hide other formats and editions. Pablo P. Boix. 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. Many different solar cell technologies are being developed, for various applications (rooftops, solar power plants, satellites, backpacks or clothing, etc.). In the last two decades the contribution of solar energy to the world’s total energy supply has grown significantly. Holes are created when electrons move from its position. But, a single photovoltaic cell does not produce enough amount of electricity. The free electrons in the depletion region can quickly come to the n-type side of the junction. A detailed but accessible introduction to solar science and technology. Since most of the energy in sunlight and artificial light is in the visible range of electromagnetic radiation, a solar cell absorber should be efficient in absorbing radiation at those wavelengths. similar to batteries; however battery uses SOLAR CELLS Chapter 4. Please select which sections you would like to print: Corrections? Author of. Conversion of light energy in electrical energy is based on a phenomenon called photovoltaic effect. The solar cell technology is the fastest growing power generating technology in the world. Learn about efforts to increase the efficiency of solar cells. First, a brief review of the fundamental properties of semiconductors is given that includes an overview of semiconductor band structure and carrier generation, recombination, and transport. The material requirements would be enormous but feasible, as silicon is the second most abundant element in Earth’s crust. 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. • Sunlight which is made of photons are particles which contain energy. A solar energy plant produces megawatts of electricity. Protons are positively charged and electrons are negatively charged. The principle of operation of a PV cell. These cells are made of semiconductor materials, the most widely used being silicon. Facebook Twitter LinkedIn Pinterest. A photovoltaic cell is also called a solar cell. They convert sunlight into direct current (DC) electricity. In fact, Si solar cells have a similar selectivity mechanism where the band bending produced by the p-n junction is limited to a very narrow interfacial layer, significantly thin in comparison with the whole absorber thickness. These constraints will be defined by the working environment in which solar cells are produced. Solar cell works on the principle of photovoltaic effect. Solar cell design involves specifying the parameters of a solar cell structure in order to maximize efficiency, given a certain set of constraints. Due to this absorbed energy, the phenomena of photovoltaic occurs and electrons are liberated and produce the external DC current. Solar Cell Characteristics in Practice. the generation of a potential difference at the junction of two different materials in response to electromag- … The three energy-conversion layers below the antireflection layer are the top junction layer, the absorber layer, which constitutes the core of the device, and the back junction layer. UIT Cambridge, 2016. 1). The back electrical contact layer has no such diametrically opposed restrictions. In microelectronics the goal is, of course, to construct electronic components of ever smaller dimensions in order to increase their density and operating speed within semiconductor chips, or integrated circuits. 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