Robust ultrathin oxynitride with high nitrogen diffusion barrier near its surface formed by NH3 nitridation of chemical oxide and reoxidation with O2

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作者
Lai, Chiung Hui [1 ,2 ]
Lin, Bo Chun [3 ]
Chang, Kow Ming [1 ]
Hsieh, Kuang Yeu [4 ]
Lai, Yi Lung [5 ]
机构
[1] Department of Electronics Engineering, Institute of Electronics, National Chiao-Tung University, Hsin-Chu, Taiwan
[2] Department of Electrical Engineering, Chung Chou Institute of Technology, Yuanlin Changhwa 510, Taiwan
[3] Department of Electronic Engineering, Northern Taiwan Institute of Science and Technology, Taipei 112, Taiwan
[4] Nano-technology R and D Division, Emerging Central Laboratory, Macronix International Co., Ltd., Hsinchu, 300, Taiwan
[5] Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
关键词
We have proposed an approach for growing robust ultrathin oxynitride using conventional thermal processes with the capability of preventing boron penetration. In this method; we obtain oxynitride with high nitrogen concentration (13 at. %) on the top and low interface state density (D it = 2 × 1010 cm-2 eV-1). The films demonstrate excellent properties in terms of low Dit; low leakage current; high endurance in stressing and superior boron diffusion blocking behavior. This method does not involve any additional capital equipment [such as decoupled plasma nitridation (DPN) or remote plasma nitridation (RPN)] or gas (NO or N2O). In addition; it obtains high-quality oxynitride film with low thermal budget. Most importantly; this process is simple and fully compatible with current process technology. It would be important and interesting for process engineers engaged in the field of gate dielectrics. It is suitable for the next generation of ULSI technology. © 2006 The Japan Society of Applied Physics;
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页码:4898 / 4902
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