Investigation of converted p+ poly-Si gate formed by B18Hx+ cluster ion implantation

被引:0
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作者
Hwang, Sun-Hwan [1 ]
Kim, D. S. [1 ]
Joo, Y. H. [1 ]
Oh, J. G. [1 ]
Lee, J. K. [1 ]
Jung, T. W. [1 ]
Cho, H. J. [1 ]
Sohn, Y. S. [1 ]
Sheen, D. S. [1 ]
Pyi, S. H.
Kim, Steve
Huh, T. H.
Krull, W. A. [2 ]
Cho, H. T. [2 ]
机构
[1] Hynix Semicond Inc, San 136-1 Amiri, Ichon 467701, Kyoungki, South Korea
[2] SemEquip Inc, N Billerica 01862, MA USA
来源
关键词
B18HX+; cluster boron; P+ poly;
D O I
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中图分类号
O59 [应用物理学];
学科分类号
摘要
Conventional B+ or BF2+ implantation has a limitation in terms of throughput and energy contamination. Boron cluster implantation is one alternative to solve this problem. We have investigated the characteristics of B(18)H(X)(+)cluster ion implantation using p(+) poly-Si gated MOS capacitors. The B18HX+ cluster was implanted to n(+) poly-Si in order to convert to p(+) poly-Si with energy of 2.5keV and dose of 1.6E 16 similar to 2.0E 16 ions/cm(2). The improvement in the inversion capacitance (more then 3%) was observed in the case of cluster ion implantation. This result indicates less poly-silicon depletion effect. It was verified by TDS and SIMS that the hydrogen level of the by p(+) poly-Si gate implanted by the cluster ions, and then annealed, was similar to that of a sample implanted by conventional B+ ions. Thus, boron cluster implantation was proven to be more beneficial than the conventional B+ implantation for the capacitor performance.
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页码:163 / +
页数:2
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