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LBIC ANALYSIS FOR GRAIN-BOUNDARY CHARACTERIZATION IN INHOMOGENEOUS MATERIALS

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HAL Id: jpa-00229652

https://hal.archives-ouvertes.fr/jpa-00229652

Submitted on 1 Jan 1989

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LBIC ANALYSIS FOR GRAIN-BOUNDARY CHARACTERIZATION IN INHOMOGENEOUS

MATERIALS

H. El Ghitani

To cite this version:

H. El Ghitani. LBIC ANALYSIS FOR GRAIN-BOUNDARY CHARACTERIZATION IN INHO- MOGENEOUS MATERIALS. Journal de Physique Colloques, 1989, 50 (C6), pp.C6-161-C6-161.

�10.1051/jphyscol:1989621�. �jpa-00229652�

(2)

REVUE DE PHYSIQUE APPLIQUEE

Colloque C6, Suppl6ment au n06, Tome 24, Juin 1989

LBIC ANALYSIS FOR GRAIN-BOUNDARY CHARACTERIZATION IN INHOMOGENEOUS MATERIALS

H. EL GHITANI

Laboratoire de PhotoBlectricitB des Semi-Conducteurs, Facult6 des Sciences et Techniques de Marseille Saint-JBr6me. Universitk d'Aix-Marseille III, F-13397 Marseille Cedex 13, France

The interfacial recombination velocity S of Grain-Boundaries (G.B.'s) may be evaluated by means of LBIC scan line at wavelength

a >/

940 nm using a finite diameter light spot. ZOOK /I/ has proposed a method to determine S , based on the photocurrent attenuation within a G.B., assuming that the minority carrier diffusion length L in the grains is constant. This assumption is not experimentally verified and causes large errors in the S evaluation.

A model has been developped, using the Green's function method, to compute the LBIC profile at different wavelengths taking in account the local variation of L determined experimentally. This model is valid for different spot diameters and for different thicknesses of samples.

Experimentally, arrays of small diodes ( 2 mm2) realized in G.B.

containing regions of the material were used to draw the LBIC scan lines and to measure effective diffusion length of minority carrier by the S.P.V. method at different distances from a given G.B. Details of the experimental technics have been given previously / 2 / .

Figure 1 shows the experimental values ( 0 ) of the normalized photocurrent within a G. B. , and curve 2 is the profile computed with the present model, while curve 1 is that computed by means of ZOOK1s method.

A fairly well agreement is obtained between the experimental points and the model, particularly in the vicinity of G.B.

Directly from the attenuation of photocurrent at G.B.'s the S values can be obtained.

References

/I/ J.D. ZOOK, Appl. Phys. Lett. 37 (21, July (1980).

/2/ G. MATHIAN, H. AMZIL, M. ZEHAF, J.P. CREST, S. MARTINUZZI and J. OUALID, Solid State Electronics 26, 131 , 1983.

3

Fig.1. Photoelectric profile near a G.B.

(1 ) Zookls model (2) Present model .Experimental results.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1989621

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