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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2009. V. 12, N 1. P. 077-082.
Estimation of photodiode frequency characteristics determined by motion of charge carriers in the space charge region. The case of even generation of carriers
SPF "Tenzor" Ltd, 226, Chervonoarmiiska str., 58013 Chernivtsi, Ukraine E-mail: chtenz@chv.ukrpack.net
Abstract. Performed in this work is estimation of photodiode frequency characteristics determined by motion of charge carriers in the space charge region for the case of even generation of charge carriers. It has been shown that the current in the external circuit depends on two functions, specific type of which, in its turn, depends on distribution of the electric field and density of generated current, and is fully determined by a set of parameters inherent to photodetector material and incident radiation. The sensitivity for frequencies higher than the boundary one is inversely proportional to the frequency. Simplicity, general form and exactness of the obtained expressions do them suitable for the use when constructing new photodiodes.
Keywords: photodiode, charge carrier, space charge region.
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