Conductive Domain-Wall Temperature Sensors of LiNbO3 Ferroelectric Single-Crystal Thin Films
Conductive Domain-Wall Temperature Sensors of LiNbO3 Ferroelectric Single-Crystal Thin Films
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DOI：
10.1109/led.2021.3118384
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发表时间：
2021-12-01
影响因子：
4.9
通讯作者：
Chou, Xiujian
中科院分区：
文献类型：
--
作者：
Geng, Wenping;He, Jinlong;Chou, Xiujian
在纳米电子技术时代，畴壁电流因其高的开关比和纳米结构尺寸而在存储器件、逻辑器件和传感器中起着关键作用。本文利用压电响应力显微镜（PFM）和导电原子力显微镜（c-AFM）研究了LiNbO_3单晶薄膜的DWC。我们主要关注DWC的电压和温度依赖性，其随着电压和温度的增加而增加。在此基础上，研制了宽温区封装DWC温度传感器。畴壁的存在使得在15 V电压下电流开关比高达103。我们的研究表明，DWC在140 ~ 500 K范围内具有负温度系数（NTC）。电流从3 pA增加到57 μ A，这归因于开关畴的导电性。提出了一种宽温区、高兼容性和高灵敏度的新型温度传感器。此外，它为铁电畴工程器件的恶劣环境应用提供了支持。
Domain wall current (DWC) plays a key role in storage devices, logic devices and sensors due to its high on-off ratio and nano structure size in the era of nanoelectronics technology. In this work, the DWC of single crystal LiNbO3 thin film was studied by piezoresponse force microscope(PFM) and conducting atomic forcemicroscope (c-AFM). We mainly focus on voltage and temperature dependence of DWC which increases with the voltage and temperatures. Based on this research, the packaged DWC temperature sensor is fabricated and applied in wide temperature range. The existence of domain walls makes the current on-off ratio as high as 103 at the voltage of 15 V. Our study shows that DWC has a negative temperature coefficient (NTC) from 140 K to 500 K. The current increases from 3 pA to 57 mu A, which is attributed to the conductivity of switched domain. This work proposes a new type temperature sensor with wide temperature range and high compatibility and sensitivity. In addition, it provides support for harsh environment applications of ferroelectric domain engineering devices.