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Time Dependence of Spatial Defect Profiles in a-Si:H Solar Cells with Light-Soaking

Published online by Cambridge University Press:  15 February 2011

D. Caputo ,
M. Maggi ,
G. Masini ,
F. Palma ,
K. Vasanth  and
S. Wagner
D. Caputo
Affiliation:
University of Rome “La Sapienza”, Department of Electronic Engineering, 00184 Rome, Italy
M. Maggi
Affiliation:
University of Rome “La Sapienza”, Department of Electronic Engineering, 00184 Rome, Italy
G. Masini
Affiliation:
University of Rome “La Sapienza”, Department of Electronic Engineering, 00184 Rome, Italy
F. Palma
Affiliation:
University of Rome “La Sapienza”, Department of Electronic Engineering, 00184 Rome, Italy
K. Vasanth
Affiliation:
Princeton University, Department of Electrical Engineering, Princeton, New Jersey, 08544, U.S.A.
S. Wagner
Affiliation:
Princeton University, Department of Electrical Engineering, Princeton, New Jersey, 08544, U.S.A.
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Abstract

We report on modeling the evolution of the spatial defect profile in the i-layer of a-Si:H solar cells combined with tests of the model against the efficiency decay of amorphous silicon (a-Si:H) p-i-n solar cells under various light-soaking conditions. We use a finite-element device simulator. The defect density during light-soaking is calculated as a function of time and of position. The defect density evolves due to the combined effects of light-induced generation, assumed proportional to the product of free carrier densities, and of light-induced annealing, assumed proportional to the sum of carrier densities. We find that in thick cells defects close to the p-i interface affect cell efficiency less than bulk defects, and that in thin cells the defect density increases significantly in the central portion of the i-layer. However, in thin cells the high electric field masks the effect of the defect density increase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 377: Symposium A – Amorphous Silicon Technology 1995 , 1995 , 669
Copyright
Copyright © Materials Research Society 1995

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References

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