Abstract
We propose and demonstrate a method to remove performance-limiting dislocations from multicrystalline silicon (mc-Si) solar cell material, appropriate for wafers or bricks. Dislocation density reductions of >95% are achieved in commercial mc-Si via high temperature annealing with an impurity diffusion barrier, with controlled ambient and time-temperature profiles. The dislocation density reduction follows temperature-dependent models developed by Kuhlmann [Proc. Phys. Soc., London, Sect. A 64, 140 (1951)] and Nes [Acta Metall. Mater. 43, 2189 (1995)]. It is believed that higher annealing temperatures (>1170 °C) allow dislocation movement unconstrained by crystallographic glide planes, leading to dislocation annihilation within minutes.
Original language | English (US) |
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Article number | 122108 |
Journal | Applied Physics Letters |
Volume | 93 |
Issue number | 12 |
DOIs | |
State | Published - 2008 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)