Ultrafast photoinduced strain in super-tetragonal PbTiO3 ferroelectric films
Ultrafast photoinduced strain in super-tetragonal PbTiO3 ferroelectric films
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超四方 PbTiO3 铁电薄膜中的超快光致应变
DOI：
10.1007/s40843-020-1565-8
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Jianjun Tian
中科院分区：
文献类型：
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作者：
Linxing Zhang;Darui Sun;Maosheng Chai;Xianran Xing;Jun Chen;Bingbing Zhang;Jianjun Tian
在过去的十年中，压电效应和光伏效应的铁电耦合中的超快光致应变一直受到关注，使它们扩展了许多应用，包括超快光学存储器，传感器和具有应变工程的致动器。铁电体中超快光致应变的产生机制一般认为是光生载流子屏蔽退极化场，而应变的热分量通常被稀释为偏移量，没有系统地面对，导致不必要的混淆。本文利用高重复频率超快X射线衍射研究了复合铁电外延薄膜的正、负热膨胀效应，并结合压电、光伏效应进行了沿着研究。在超快应变过程中，正负热效应和压电/光伏效应的耦合得到了证实和调控。观察到不同轴比样品由于热效应不同而出现相反的晶格响应。最大超快光致应变达到0.24%，与传统铁电材料相当。感生应变中的热效应和铁电效应的相互作用，促进了光、热、电耦合的多样化应用。
The ultrafast photoinduced strain in ferroelectric coupling of piezoelectric and photovoltaic effects have been focused in the last decade, making them extend numerous applications including ultrafast optical memories, sensors and actuators with strain engineering. The mechanism of screening of the depolarization field by photoinduced carriers is generally accepted for ultrafast photoinduced strain in ferroelectric, while the thermal component of the strain is usually diluted as the offset and have not been systematically confronted, leading to unnecessary confusion. Herein, both the positive and negative thermal expansion effect in composite ferroelectric epitaxial films have been investigated by use of high repetition rate ultrafast X-ray diffraction, along with the piezoelectric and photovoltaic effects. The coupling of the positive/negative thermal effects and the piezoelectric/photovoltaic effects in ultrafast strain have been evidenced and regulated. The opposite lattice response due to different thermal effect of the different axial ratio samples have been observed. The maximum ultrafast photoinduced strain is up to 0.24%, comparable to that of conventional ferroelectric. The interaction of thermal and ferroelectric effect in the induced strain could promote the diversified application with the coupling of light, heat and electricity.