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Proceedings Paper

AlGaN-based focal plane arrays for selective UV imaging at 310nm and 280nm and route toward deep UV imaging
Author(s): Jean-Luc Reverchon; Jean-Alexandre Robo; Jean-Patrick Truffer; Jean-Pascal Caumes; Idir Mourad; Julien Brault; Jean-Yves Duboz
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Paper Abstract

The fast development of nitrides has given the opportunity to investigate AlGaN as a material for ultraviolet detection. Such camera present an intrinsic spectral selectivity and an extremely low dark current at room temperature. It can compete with technologies based on photocathodes, MCP intensifiers, back thinned CCD or hybrid CMOS focal plane arrays (FPA) for low flux measurements. AlGaN based cameras allow UV imaging without filters or with simplified ones in harsh solar blind conditions. Few results on camera have been shown in the last years, but the ultimate performances of AlGaN photodiodes couldn't be achieved due to parasitic illumination of multiplexers, responsivity of p layers in p-i-n structures, or use of cooled readout circuit. Such issues have prevented up to now a large development of this technology. We present results on focal plane array of 320x256 pixels with a pitch of 30μm for which Schottky photodiodes are multiplexed with a readout circuit protected by black matrix at room temperature. Theses focal plane present a peak reponsivity around 280nm and 310nm with a rejection of visible light of four decades only limited by internal photoemission in contact. Then we will show the capability to outdoor measurements. The noise figure is due to readout noise of the multiplexer and we will investigate the ultimate capabilities of Schottky diodes or Metal- Semiconductor-Metal (MSM) technologies to detect extremely low signal. Furthermore, we will consider deep UV measurements on single pixels MSM from 32nm to 61nm in a front side illumination configuration. Finally, we will define technology process allowing backside illumination and deep UV imaging.

Paper Details

Date Published: 26 October 2007
PDF: 9 pages
Proc. SPIE 6744, Sensors, Systems, and Next-Generation Satellites XI, 674417 (26 October 2007); doi: 10.1117/12.754794
Show Author Affiliations
Jean-Luc Reverchon, Thales Research & Technology (France)
Jean-Alexandre Robo, Thales Research & Technology (France)
Jean-Patrick Truffer, Thales Research & Technology (France)
Jean-Pascal Caumes, Commissariat à l'Energie Atomique (France)
Idir Mourad, Synchrotron SOLEIL (France)
Julien Brault, Ctr. National de la Recherche Scientifique (France)
Jean-Yves Duboz, Ctr. National de la Recherche Scientifique (France)

Published in SPIE Proceedings Vol. 6744:
Sensors, Systems, and Next-Generation Satellites XI
Shahid Habib; Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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