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Image and color sensitive detector based on double p-i-n/p-i-n a-SiC:H photodiode

Published online by Cambridge University Press:  01 February 2011

M. Vieira ,
M. Fernandes ,
P. Louro ,
A. Fantoni ,
Y. Vygranenko ,
G. Lavareda  and
C.N. Carvalho
M. Vieira
Affiliation:
Electronics Telecommunication and Computer Dept. ISEL, R.Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, mv@isel.ipl.pt
M. Fernandes
Affiliation:
Electronics Telecommunication and Computer Dept. ISEL, R.Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, mv@isel.ipl.pt
P. Louro
Affiliation:
Electronics Telecommunication and Computer Dept. ISEL, R.Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, mv@isel.ipl.pt
A. Fantoni
Affiliation:
Electronics Telecommunication and Computer Dept. ISEL, R.Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, mv@isel.ipl.pt
Y. Vygranenko
Affiliation:
Electronics Telecommunication and Computer Dept. ISEL, R.Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, mv@isel.ipl.pt
G. Lavareda
Affiliation:
CFM-UTL-Av. Rovisco Pais, Lisbon, Lisbon, Portugal, pccanc@alfa.ist.utl.pt.
C.N. Carvalho
Affiliation:
CFM-UTL-Av. Rovisco Pais, Lisbon, Lisbon, Portugal, pccanc@alfa.ist.utl.pt.
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Abstract

A two terminal image and color sensitive detector based on two stacked sensing/switching p-i-n a-SiC:H diodes is presented. The imaging is performed in a write-read simultaneous process: the write exposure, which converts the optical image into a localized packet of charges and the readout which performs the charge to current conversion by detecting the photocurrent generated by a light beam scanner. By sampling the absorption region at appropriated voltages it is possible to extract separately the RGB integrated information with a good rejection ratio. Readout of 1000 lines per second is achieved allowing continuous and fast color recognition and image detection. A trade-off between the sensing and the switching diodes thicknesses is established in order to enhance the green recognition. When it is used a thin a-SiC:H, optimized for red transmittance and blue collection, and a switching absorber thick enough to absorb most of the incoming green light,the detector behaves itself as a filter giving information about the wavelength and the position of the optical image.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 862: Symposium A – Amorphous and Nanocrystalline Silicon Science and Technology–2005 , 2005 , A13.4
Copyright
Copyright © Materials Research Society 2005

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