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Proceedings Paper

Organic photodetectors: a possible technology for on-fiber receivers
Author(s): Marco Sampietro; Giorgio Ferrari; Dario Natali; Massimiliano Arca; Carla Denotti; Francesco Devillanova
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Paper Abstract

A new class of photodetectors, whose active material is an organic semiconductor, has been developed. Thanks to the ease of deposition on any dielectric surface, the device may be built directly on the cleaved surface of an optical fiber, therefore realizing an on-fiber-detector (OFD). The photodetector is based on an organic semiconductor belonging to a new general class of neutral dithiolenes deposited onto a quartz substrate with microlithographically defined gold electrodes so to realize a metal-semiconductor-metal surface structure. First experimental results on a photodiode made of (monoreduced imidazolidine-2,4,5-trithione) having peak responsivity at 1014nm, have shown a time response down to 100microseconds, at present limited by the leakage current noise due to the poorly rectifying contacts. Differently from the vast majority of organic semiconductor materials, dithiolenes have shown extremely high chemical and thermal stability. The photoresponse of the dithiolenes in the liquid phase is shown to be wavelength selective with an absorption peak about 150nm wide that can be chemically tailored so to shift from almost 1000nm to 1700nm. Experimental measurements to prove that the absorption property is maintained in the solid state also at wavelengths around 1500nm, thus covering with a photodetector the spectrum of possible telecom applications, are under way.

Paper Details

Date Published: 15 April 2003
PDF: 8 pages
Proc. SPIE 4943, Fiber-based Component Fabrication, Testing, and Connectorization, (15 April 2003); doi: 10.1117/12.468549
Show Author Affiliations
Marco Sampietro, Politecnico di Milano (Italy)
Giorgio Ferrari, Politecnico di Milano (Italy)
Dario Natali, Politecnico di Milano (Italy)
Massimiliano Arca, Univ. degli Studi di Cagliari (Italy)
Carla Denotti, Univ. degli Studi di Cagliari (Italy)
Francesco Devillanova, Univ. degli Studi di Cagliari (Italy)

Published in SPIE Proceedings Vol. 4943:
Fiber-based Component Fabrication, Testing, and Connectorization
Valerio Pruneri; Robert P. Dahlgren; Gregory M. Sanger, Editor(s)

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