Electrical probing of surface and bulk traps in proton-irradiated gate-assisted lateral PNP transistors

The effects of 46 MeV proton irradiation-induced trap generation and its impact on the electrical characteristics of gate assisted lateral PNP transistors (GLPNP) are investigated for the first time. At proton fluence as high as 10/sup 12/ p/cm/sup 2/ the devices show a negligible current gain degra...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1998-12, Vol.45 (6), p.2361-2365
Main Authors: Niu, G., Banerjee, G., Cressler, J.D., Roldan, J.M., Clark, S.D., Ahlgren, D.C.
Format: Article
Language:English
Subjects:
BiCMOS integrated circuits
Degradation
Germanium silicon alloys
Heterojunction bipolar transistors
Microelectronics
MOSFETs
Protons
Silicon germanium
Threshold voltage
USA Councils
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Summary:The effects of 46 MeV proton irradiation-induced trap generation and its impact on the electrical characteristics of gate assisted lateral PNP transistors (GLPNP) are investigated for the first time. At proton fluence as high as 10/sup 12/ p/cm/sup 2/ the devices show a negligible current gain degradation, and at 10/sup 13/ p/cm/sup 2/ the devices are still functional. The excellent radiation hardness is attributed to the much thinner gate oxide than in conventional lateral PNPs and its gate assisted operation. By changing the gate bias, and modulating the surface status from accumulation to inversion, the surface traps can be electrically probed from the I-V characteristics. A base current peak is observed after radiation, and is understood using 2D device simulation to be a result of the increase in oxide charge and surface trap density, in conjunction with the different SRH recombination rate limiting mechanism in presence of high density traps. The inverse mode operation is shown to be a useful tool for probing the bulk traps.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.736455