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Hydrogenated Amorphous Silicon Speed Sensor Based on the Flying Spot Technique

Published online by Cambridge University Press:  15 February 2011

M. Vieira ,
A. Fantoni ,
A. Maçarico ,
F. Soares ,
G. Evans  and
R. Martins
M. Vieira
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
A. Fantoni
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
A. Maçarico
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
F. Soares
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
G. Evans
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
R. Martins
Affiliation:
FCT-UNL/UNINOVA, Quinta da Torre, 2825 Monte da Caparica, PORTUGAL
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Abstract

In the past we have developed a transient technique, called the Flying Spot Technique (FST). FST allows, not only to infer the ambipolar diffusion length but also the effective lifetime of the photogenerated carriers once the light spot velocity and geometry of the structure were known.

In this paper, we propose to apply this technique backwards in order to detect the path and velocity of an object that is moving in the direction of a light source. The light reflected back from the object is analyzed through a p.i.n structure being the transient transverse photovoltage dependent on the movement of the object (position and velocity). Assuming that the transport properties of the material and the geometry of the device are known and using a triangulation method we show that it is possible to map the movement of the object. Details concerning material characterization, simulation and device geometry are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 377: Symposium A – Amorphous Silicon Technology 1995 , 1995 , 839
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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