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JOURNAL OF SYNTHETIC CRYSTALS ›› 2023, Vol. 52 ›› Issue (5): 857-877.

Special Issue: 半导体薄膜与外延技术

• Advanced Epitaxy and Related Techniques • Previous Articles     Next Articles

Research Status of Iridium-Based Composite Substrates for Heteroepitaxy of Single Crystal Diamond

QU Pengfei1,2, JIN Peng1,2, ZHOU Guangdi1,2, WANG Zhen1,2, XU Dunzhou1,2, WU Ju1, ZHENG Hongjun1, WANG Zhanguo1,2   

  1. 1. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2023-03-20 Online:2023-05-15 Published:2023-06-05

Abstract: The excellent physical properties of diamond make it one of the most promising semiconductor materials for the next generation. At present, heteroepitaxy based on microwave plasma chemical vapor deposition may be the best method for preparing large-scale single crystal diamond in the future. In the past three decades, some progress has been made in the heteroepitaxial growth of single crystal diamond on iridium-based composite substrates, especially in recent years, the growth of large-scale single crystal diamond of more than 2 inch has been realized. This paper summarizes the various substrates used for diamond heteroepitaxy, briefly introduces bias-enhanced nucleation on heterogeneous substrates, and details the most successful iridium/oxide, iridium/oxide layer/silicon composite substrates. In the end, the problems existing in diamond heterogeneous substrates and heteroepitaxy are summarized, and some possible solutions are given.

Key words: diamond, iridium-based composite substrate, semiconductor, heteroepitaxy, bias-enhanced nucleation, microwave plasma chemical vapor deposition

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