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A Significant Decrease in Thermal Conductivity in Eu- and Cd-Doped ZnO Films
DOI:10.3390/nano16150928.png)
摘要
En 中文
我们证明,在r面蓝宝石(Al₂O₃)上通过等离子体辅助分子束外延生长的Cd/Eu共掺杂非极性a面取向ZnO薄膜中,掺杂剂不均匀性显著抑制了热导率。X射线衍射证实了a面取向的ZnO薄膜中不存在可检测的次生相。截面扫描电子显微镜显示薄膜连续且界面清晰,二次离子质谱深度剖析确定了Cd/Eu在薄膜厚度方向上的掺入以及衬底界面处Zn/O的陡峭下降。采用频域光热红外辐射计(PTR)在室温下测量了垂直于平面的热输运,并通过拟合复PTR振幅和相位与多层热扩散模型进行分析。提取的热导率(κ)范围为~3.7–6.3 W·m⁻¹·K⁻¹。最低κ值与Eu分布不均匀性增加相关,这与增强的声子散射和减少的有效垂直于平面的热输运一致。
Keyword:
thermal conductivity
ZnO
doping
期刊
N
IF:
4.3
论文数:
2.3W
被引数:
8.1W
机构
引用论文
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