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- W114850524 abstract "This chapter discusses various methods of generating the internal electric field required for separation of hole-electron pairs, and then derives the equations necessary to predict the magnitude of the electrical power generated and the efficiency with which the solar cells convert solar energy to electrical energy. If a local electric field is present within the semiconductor, it can be used to separate the constituent parts (holes and electrons) of the hole-electron pairs. Once separated, the collected charge carriers (holes and electrons) produce a space charge that results in a voltage across the semiconductor. This voltage is known as the “photovoltage.” The product of the photovoltage and the photocurrent represents a net flow of energy (when integrated over time) from the solar cell (semiconductor) to the external load. This energy originated in the sun and was converted from photon-energy to electrical energy when the photons were absorbed within the solar cell and the resultant hole-electron pairs were separated by the internal electric field. Electric fields can be generated within a semiconductor by: (1) Altering the composition or impurity concentration of the semiconductor (a heterotransition); 2) by varying the type of impurity doping within a semiconductor (a pn junction); or (3) by varying both (a heterojunction). Other possible techniques which can be employed in the generation of local electric fields are: (1) the introduction of mechanical strains; (2) the introduction of impurity atoms which produce strains; (3) the Dember effect that is a result of the differential diffusivities of the mobile charge carriers; (4) the photomagnetoelectric effect; and (5) the anomalous photovoltaic effect, a phenomenon that frequently produces voltages much greater than the energy gap." @default.
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- W114850524 date "1995-01-01" @default.
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- W114850524 title "BASIC THEORETICAL PERFORMANCE" @default.
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- W114850524 doi "https://doi.org/10.1016/b978-044489818-0/50005-3" @default.
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