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Measurement of Photo Capacitance in Amorphous Silicon Photodiodes

Abstract : This paper discusses the photodiode capacitance dependence on imposed light and applied voltage using different devices. The first device is a double amorphous silicon pin-pin photodiode; the second one a crystalline pin diode and the last one a single pin amorphous silicon diode. Double amorphous silicon diodes can be used as (de)multiplexer devices for optical communications. For short range applications, using plastic optical fibres, the WDM (wavelength-division multiplexing) technique can be used in the visible light range to encode multiple signals. Experimental results consist on measurements of the photodiode capacitance under different conditions of imposed light and applied voltage. The relation between the capacitive effects of the double diode and the quality of the semiconductor internal junction will be analysed. The dynamics of charge accumulations will be measured when the photodiode is illuminated by a pulsed monochromatic light.
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Dora Gonçalves, L. Fernandes, Paula Louro, Manuela Vieira, Alessandro Fantoni. Measurement of Photo Capacitance in Amorphous Silicon Photodiodes. 4th Doctoral Conference on Computing, Electrical and Industrial Systems (DoCEIS), Apr 2013, Costa de Caparica, Portugal. pp.547-554, ⟨10.1007/978-3-642-37291-9_59⟩. ⟨hal-01348801⟩

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