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Vacancy Generation by Laser Preirradiation for Junction Leakage Suppression

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8 Author(s)
Xueming Tan, D. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Kuang Kian Ong ; Pey, K.-L. ; Wang, Xincai
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Vacancy generation by laser preirradiation on silicon substrate before implantation for advanced junction engineering was demonstrated. Amorphized p+/n junction diodes subjected to preimplant laser irradiation show a twofold reduction on the off-state leakage current and a two-time improvement on the on-state current compared to control devices without any preirradiation. The defect-removal mechanism is achieved by the recombination of excess vacancies trapped at the maximum laser melt depth as a result of the molten silicon recrystallization with the implantation-generated interstitials. The effectiveness of laser-generated vacancies in annihilating residual defects is evident in the suppression of junction leakage current.

Published in:

Electron Device Letters, IEEE  (Volume:30 ,  Issue: 12 )

Date of Publication:

Dec. 2009

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