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Revista mexicana de física

Print version ISSN 0035-001X

Rev. mex. fis. vol.52  suppl.2 México Feb. 2006

 

Optical sensitivity of Al/SRO/Si MOS diodes

 

Z. Yuª, M. Acevesª and J. Carrillob

 

ª Departamento Electrónica, INAOE, Apartado Postal 51, Puebla, Pue., 72000, México, e–mail: zyu@inaoep.mx

b Centro de Investigaciones en Dispositivos Semiconductores, Benemérita Universidad Autónoma de Puebla, Puebla, México.

 

Recibido el 27 de octubre de 2004
Aceptado el 19 de mayo de 2005

 

Abstract

In this work, the I–V characteristics of an Al/SRO/Si MOS–like diode under illumination were studied. A strongly illumination–dependent photocurrent was observed although the structure was opaque on both sides. The possible mechanisms that create the photocurrent were studied. We believe that the photo–carriers generated in a region surrounding the surface depletion layer dominate the photocurrent. The carriers generated by light in this region can diffuse into the depletion layer, and contribute to the photocurrent.

Keywords: Silicon–rich oxide; MOS–like structure; photosensitive; optical sensor.

 

Resumen

En este trabajo, estudiamos las características I–V de una estructura Al/SRO/Si tipo MOS bajo iluminación. Se observó una gran fotocorriente aunque la estructura tiene Al que opaca por ambas superficies. Los posibles mecanismos que producen la fotocorriente fueron estudiados. Creemos que los foto–portadores generados en una región que rodea a la región de agotamiento dominan la fotocorriente. Los portadores generados en esta región difunden hacia la región de agotamiento y contribuyen a la gran fotocorriente.

Descriptores: Óxido de silicio rico en silicio; estructuras tipo MOS; foto–sensibilidad; sensores ópticos.

 

PACS: 73.63.Kv; 73.40.Qv; 73.23.Hk; 72.20.Jv

 

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Acknowledgements

We thank the China National Natural Science Foundation (contract number 50172061) and CONACYT, México, for financial support. We are grateful fot the technical help from P. Alarcón, M. Landa, C. Zuñiga, I. Juarez, N. Carlos and A. Itzmoyotl.

 

Resumen

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