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Open Access Nano Express

Atomic layer deposition of high-density Pt nanodots on Al2O3 film using (MeCp)Pt(Me)3 and O2 precursors for nonvolatile memory applications

Shi-Jin Ding*, Hong-Bing Chen, Xing-Mei Cui, Sun Chen, Qing-Qing Sun, Peng Zhou, Hong-Liang Lu, David Wei Zhang and Chen Shen

Author Affiliations

State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, 200433, China

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Nanoscale Research Letters 2013, 8:80  doi:10.1186/1556-276X-8-80

Published: 15 February 2013

Abstract

Pt nanodots have been grown on Al2O3 film via atomic layer deposition (ALD) using (MeCp)Pt(Me)3 and O2 precursors. Influence of the substrate temperature, pulse time of (MeCp)Pt(Me)3, and deposition cycles on ALD Pt has been studied comprehensively by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Therefore, Pt nanodots with a high density of approximately 2 × 1012 cm-2 have been achieved under optimized conditions: 300°C substrate temperature, 1 s pulse time of (MeCp)Pt(Me)3, and 70 deposition cycles. Further, metal-oxide-semiconductor capacitors with Pt nanodots embedded in ALD Al2O3 dielectric have been fabricated and characterized electrically, indicating noticeable electron trapping capacity, efficient programmable and erasable characteristics, and good charge retention.

Keywords:
Atomic layer deposition; Pt nanodots; Nonvolatile memory