Direct Integration of Polycrystalline Diamond With 3C‐SiC for Enhanced Thermal Management in GaN HEMTs: Impact of Grain Structure and Interface Engineering - Moriyama, Chiharu; Cheng, Zhe; Huang, Zifeng; Ohno, Yutaka; Inoue, Koji; Nagai, Yasuyoshi; Shigekawa, Naoteru; Liang, Jianbo (Advanced Materials Technologies, 2025)