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Influence of Different Atmospheres on the Life Time of Porous Silicon Light-Emitting Devices

Published online by Cambridge University Press:  11 February 2011

B.R. Jumayev ,
H.L. Tam ,
K.W. Cheah  and
N.E. Korsunska
B.R. Jumayev*
Affiliation:
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
H.L. Tam
Affiliation:
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
K.W. Cheah
Affiliation:
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
N.E. Korsunska
Affiliation:
Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03028 Kiev, Ukraine
*
: To whom all correspondence should be addressed to
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Abstract

In present report, we investigated the degradation processes in porous silicon light-emitting devices (LED) in different atmospheres (O2, N2, air and vacuum) by photoluminescence (PL), electroluminescence (EL), lifetime (LT) and I-V characteristic measurements as well as by Energy Dispersive X-ray Spectroscopy (EDS). The contacts were made by evaporation of Au and Au/Cu alloy. The LEDs emit in visible range at forward and reverse bias. As a rule, full width at half maximum of EL spectrum is wider than that of PL spectrum. The bias direction of applied voltage during degradation change EL, PL, I-V characteristics, and LT of the LEDs. At forward bias, LT degradation is less than that in reverse bias.

The degradation of LEDs during forward bias did not produce any change in the spectral shape of EL and PL. At reverse bias, degradation led to red shift in the peak of EL and PL. The results show that the lifetime of LEDs with Au contact is longer than Au-Cu. Operating in different atmospheres, the LT in vacuum is longest and is more than 100 hours in reverse bias at room temperature.

Possible mechanisms of degradation of LEDs are discussed. It is proposed that degradation is connected mainly with two processes: oxidation and metal diffusion. It is shown that the oxygen and metal in ionic state can diffuse quickly. Hence, in forward bias, the diffusion of metal would dominate, and in reverse bias, diffusion of oxygen dominates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , F8.14
Copyright
Copyright © Materials Research Society 2003

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References

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