利用多标度性增强混合相氧化钒薄膜的热稳定性
Harnessing Multifractality to Enhance Thermal Stability in Mixed-Phase Vanadium Oxide Thin Films
AI总结：
本研究通过多标度性分析发现，氧化钒薄膜的热稳定性与表面形态复杂性和热滞后相结合，揭示了多标度性强度作为预测电子稳定性的关键指标。
摘要：
氧化钒薄膜表现出由温度驱动的电子相变，这对于传感和微电子应用具有吸引力，但其性能常常受到热滞后的影响。本研究证明，电子稳定性不仅由粗糙度或结晶度决定，而是由表面形态复杂性和热滞后独特的组合所决定，通过使用直流/射频磁控溅射在不同工作压力下沉积的薄膜揭示。具体而言，15 mTorr生长的薄膜表现出最高形态垂直复杂性和最低热滞的明显收敛，显示出几乎可逆的传输，激活能范围从0.26到0.28 eV，电阻温度系数在-0.0337到-0.035 K⁻¹之间。虽然传统粗糙度指标和单标度参数无法捕捉这种行为，多标度去趋势波动分析揭示了多标度性强度的显著峰值，这与热滞呈反比相关。这突显了多标度性强度作为电子稳定性的预测描述符，识别了在热循环中增强应力适应的多标度结构特征。这些结果定义了最佳的沉积窗口，并提供了一条通过形态指导开发热稳定的混合相氧化钒薄膜的路径。
英文摘要：
Vanadium oxide thin films exhibit temperature-driven electronic transitions desirable for sensing and microelectronic applications, yet their performance is often limited by thermal hysteresis. This study demonstrates that electronic stability is governed not simply by roughness or crystallinity but by a unique combination of surface morphological complexity and thermal hysteresis, revealed across films deposited with varying working pressure using Direct Current/Radio Frequency magnetron sputtering. Specifically, the film grown at 15 mTorr shows a distinct convergence of highest morphological vertical complexity and lowest thermal hysteresis, exhibiting nearly reversible transport with activation energies ranging from 0.26 to 0.28 eV and negative temperature coefficients of resistance between -0.0337 and -0.035 K-1. While conventional roughness metrics and mono-fractal parameters do not capture this behavior, multifractal detrended fluctuation analysis uncovers a pronounced peak in multifractality strength, which correlates inversely with thermal hysteresis. This highlights multifractality strength as a predictive descriptor of electronic stability, identifying a multiscale structural signature that enhances stress accommodation during thermal cycling. These results define an optimal deposition window and provide a morphology-guided pathway for developing thermally robust mixed-phase vanadium oxide films.
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