无机材料学报

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CVD金刚石膜应力的产生、抑制、应用及测量

李成明, 周闯, 刘鹏, 郑礼平, 赖泳机, 陈良贤, 刘金龙, 魏俊俊   

  1. 北京科技大学 新材料技术研究院,北京 100083
  • 收稿日期:2025-03-05 修回日期:2025-03-31
  • 作者简介:李成明(1962-), 教授. E-mail: chengmli@mater.ustb.edu.cn

Generation, Suppression, Application and Measurement of Stress in CVD Diamond Films

LI Chengming, ZHOU Chuang, LIU Peng, ZHENG Liping, LAI Yongji, CHEN Liangxian, LIU Jinlong, WEI Junjun   

  1. Institute for Advanced Materials and Technology, University of Science &Technology Beijing, Beijing 100083, China
  • Received:2025-03-05 Revised:2025-03-31
  • About author:LI Chengming (1962-), professor. E-mail: chengmli@mater.ustb.edu.cn

摘要: 金刚石具有优异的性能,在光学、电子器件热管理领域及宽禁带半导体领域有着广阔的应用前景,被誉为终代半导体。作为光学窗口需要大尺寸、厚度2 mm以上的CVD金刚石自支撑厚膜;在半导体散热中,则需要4英寸以上、100微米厚的金刚石自支撑膜与GaN等半导体材料进行键合。但由于技术限制,大面积CVD金刚石膜的合成及应用依旧存在较大困难。一方面,沉积过程中应力会导致金刚石膜发生破裂;另一方面,残余应力会导致金刚石膜发生翘曲,导致键合质量差。因此,对金刚石膜应力的控制成为目前金刚石膜规模化、大范围应用的一个关键问题。本文综述了CVD金刚石应力的分类、来源和以及影响应力的各种因素等,详细介绍了抑制金刚石膜应力的措施。同时,总结了通过人为施加应力来改善金刚石性能的研究,包括应力改变金刚石带隙、应力提高金刚石热导率等。最后,给出了评价金刚石应力大小的方法及理论计算公式,并分析了未来金刚石膜应力研究的趋势。

关键词: CVD金刚石, 膜应力, 应力抑制, 应力应用, 应力测量, 综述

Abstract: Diamond has excellent properties and broad application prospects in the fields of optics, electronic device thermal management, and wide bandgap semiconductors, and is known as the ultimate semiconductor. As an optical window, a large-sized CVD diamond free-standing thick film with a thickness of ≥2 mm is required. In semiconductor heat dissipation, a diamond free-standing film with a diameter over 4 inches and a thickness of 100 microns is required to bond with semiconductor materials such as gallium nitride (GaN). However, due to technological limitations, there are still significant difficulties in the synthesis and application of large-area CVD diamond films. On the one hand, stress during the deposition process can cause the diamond film to rupture. On the other hand, residual stress can cause the diamond film to warp, resulting in poor bonding quality. Therefore, controlling the stress of diamond films has become a key issue for the large-scale and widespread application of diamond films. This article summarizes the classification, sources, and influencing factors of CVD diamond stress, and provides a detailed introduction to measures to suppress stress in diamond films. At the same time, research on improving diamond properties by artificially applying stress was summarized, including changing the bandgap of diamond and increasing the thermal conductivity of diamond under stress. Finally, a method and theoretical calculation formula for evaluating the stress magnitude of diamond were provided, and the future trend of stress research on diamond films was analyzed.

Key words: CVD diamond, films stress, stress application, stress restraint, stress measurement, review

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