The influence of nitrogen doping on the thermal conductivity of diamond heat sink

AbstractAbstractDuring the epitaxial growth process of diamond heat sinks, nitrogen impurities are usually unintentionally introduced, which impact on the thermal conductivity. Therefore, the effect of nitrogen doping on the thermal conductivity of diamond heat sink is studied in this paper. The change of thermal conductivity conforms to the K = CT−1+A(B1/T)T5/2, which is attributed to the synergistic effects of phonons and carriers. With the increase of the nitrogen concentration, the downward trend of thermal conductivity gradually flattened and began to show a weak upward trend. This phenomenon is attributed to the anharmonic effect of lattice vibration rather than an increase in the number of conduction electrons.Keywords: Anharmonic effect of lattice vibrationdiamondnitrogen dopingthermal conductivity Additional informationFundingThis work was supported by the National Natural Science Foundation of China [No. U21A2073], Fund Program for the Research Project Supported by Shanxi Scholarship Council of China [Grant No. 2020-129], Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province [Grant No. 20200024], National Training Program of Innovation and Entrepreneurship for Undergraduates [Grant No. 20210468], Graduate education innovation plan projects in Shanxi [Grant No. 2021Y676], and Supported by Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [Grant No. 2021L298].