Direct mapping of temperature-difference-induced potential variation under non-thermal equilibrium
Direct mapping of temperature-difference-induced potential variation under non-thermal equilibrium
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DOI：
10.1063/5.0038363
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发表时间：
2021-03
影响因子：
4
通讯作者：
Yukihiro Komatsubara;T. Ishibe;Y. Miyato;S. Sakane;Y. Nakamura
中科院分区：
文献类型：
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作者：
Yukihiro Komatsubara;T. Ishibe;Y. Miyato;S. Sakane;Y. Nakamura
预计将开发测量系统，以获得与非热平衡现象相关的纳米空间分辨率的物理/化学信息。在这项研究中，我们开发了受控温度梯度开尔文力显微镜（T-KFM）来测量温度差（ΔT）引起的非热平衡下的真空能级变化。其中，最大的问题，即在狭窄空间（约100 μm）中应用大ΔT的困难，通过在T-KFM中引入“加热和冷却系统”来解决;样品一侧使用陶瓷加热器加热，另一侧使用液氮冷却。利用T-KFM方法，在具有纳米结构的多晶ZnO薄膜中观察到了数百纳米量级的Δ T诱导真空能级变化的空间分布。所获得的Δ T引起的真空度变化的图像可以反映诸如热阻和热电动势的热性质的分布。这种在T梯度下获得表面势的显著方法有助于我们理解非热平衡现象。
It is expected to develop the measurement system to obtain physical/chemical information with nanoscale space resolution related to the non-thermal equilibrium phenomena. In this study, we developed controlled temperature-gradient kelvin force microscopy (T-KFM) to measure the temperature difference (ΔT)-induced vacuum level variation under non-thermal equilibrium. Therein, the biggest issue, difficulty in applying the large ΔT in narrow space (∼100 μm), was solved by introducing “heating and cooling systems” in T-KFM; one sample side is heated using a ceramic heater and the other side is cooled using liquid nitrogen. Using T-KFM, the space distribution of ΔT-induced vacuum level variation was well observed on the scale of hundreds of nanometers in a polycrystalline ZnO film with nanostructures. The obtained image of the ΔT-induced vacuum level variation can reflect a distribution of the thermal properties such as the thermal resistance and thermoelectromotive force. This pronounced technique for obtaining surface potential under T-gradient helps us to comprehend the non-thermal equilibrium phenomena.