Hea. Elgamel et al., HYDROGEN IN POLYCRYSTALLINE SILICON SOLAR-CELL MATERIAL - ITS ROLE AND CHARACTERISTICS, Solar energy materials and solar cells, 53(3-4), 1998, pp. 277-284
The role and the characteristics of hydrogen in different polycrystall
ine silicon material are studied in this paper. The hydrogen diffusion
through the grains and the grain boundaries, and its diffusion coeffi
cient, are investigated, Moreover, the influence of the oxygen and the
carbon contents on the diffusion mechanism of hydrogen in silicon is
addressed. Also, it is found that the minority carrier diffusion lengt
h of polycrystalline silicon wafers considerably improves when anneale
d in hydrogen at high temperatures (>1000 degrees C). Consequently, a
significant amount of oxygen is out-diffused from the bulk of the wafe
rs, (C) 1998 Published Elsevier Science B.V. All rights reserved.