Giant voltage amplification from electrostatically induced incipient ferroelectric states.
Giant voltage amplification from electrostatically induced incipient ferroelectric states.
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DOI：
10.1038/s41563-022-01332-z
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发表时间：
2022-11
期刊：
影响因子：
41.2
通讯作者：
中科院分区：
文献类型：
--
作者：
在适当的电边界条件下，铁电材料呈现稳定的负电容响应。当铁电体处于异质结构中时，这种行为会在其他元素中产生电压放大，这些元素经历的电势差比施加的电势差更大，这为低功率电子产品带来了希望。到目前为止，研究的重点是验证这一效应，而对如何优化它知之甚少。在这里，我们描述了铁电/介质超晶格的静电理论，方便的模型系统，并说明了铁电层的负介电常数与介质层中的电压放大之间的关系。然后，我们对PbTiO_3/SrTiO_3超晶格进行了模拟，以揭示对放大影响最大的因素。特别是，我们发现当PbTiO_3接近所谓的“初始铁电态”时，可以获得巨大的效应(最高可增加10倍)。负电容(NC)是一种很有前途的低功耗电子技术。在这里，提出了一个理论，阐明了nc和电压放大之间的联系，并预测了不一定使nc最大化的初始铁电态可以导致10倍的电压放大。
Ferroelectrics subject to suitable electric boundary conditions present a steady negative capacitance response. When the ferroelectric is in a heterostructure, this behaviour yields a voltage amplification in the other elements, which experience a potential difference larger than the one applied, holding promise for low-power electronics. So far research has focused on verifying this effect and little is known about how to optimize it. Here, we describe an electrostatic theory of ferroelectric/dielectric superlattices, convenient model systems, and show the relationship between the negative permittivity of the ferroelectric layers and the voltage amplification in the dielectric ones. Then, we run simulations of PbTiO3/SrTiO3 superlattices to reveal the factors most strongly affecting the amplification. In particular, we find that giant effects (up to tenfold increases) can be obtained when PbTiO3 is brought close to the so-called ‘incipient ferroelectric’ state. Negative capacitance (NC) is a promising route towards low-power electronics. Here, a theory clarifying the connection between NC and voltage amplification is presented, and it is predicted that incipient ferroelectric states that do not necessarily maximize NC can result in a tenfold voltage amplification.
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