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Photodiodes and Photodetectors

The photodiode device geometry is similar to that of an LED. The photoconductive polymer layer is sandwiched between two electrodes, one of them transparent to permit light to achieve the polymer. The term diode is used due to the rectification characteristics of devices made with materials of different work functions. These devices present rectification in the dark as well as under illumination, owing to the role of the interface in the charge injection process. [Pg.179]

The use of materials with different work functions as electrodes in a sandwich structure introduces a built-in electric field in the polymeric layer that can be used in photoconductive tems to produce photovoltaic devices [221]. In these devices, the incident light generates free charge carriers that are transported under the influence of the built-in electric field and may produce an electric current in an external circuit. Earlier PPV-based devices constructed on an ITO/PPV/X structure (X Al, Mg, Ca PPV film [Pg.179]


See other pages where Photodiodes and Photodetectors is mentioned: [Pg.163]    [Pg.179]   


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