Zhou Junyan, Jin Shifeng, Chai Congcong, Hao Munan, Zhong Xin, Ying Tianping, Guo Jiangang, Chen Xiaolong
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China.
Innovation (Camb). 2022 Jan 1;3(2):100204. doi: 10.1016/j.xinn.2021.100204. eCollection 2022 Mar 29.
Pyroelectrics are a class of polar compounds that output electrical signals upon changes in temperature. With the rapid development of flexible electronics, organic pyroelectrics are highly desired. However, most organics suffer from low pyroelectric coefficients or low working temperatures. To date, the realization of superior pyroelectric performance in all-organics has remained a challenge. Here, we report the discovery of amantadine formate, an all-organic pyroelectric with ultrahigh voltage figures of merit ( ), surpassing those of all other known organics and commercial triglycine sulfate, LiTaO as well around room temperature. The key to the high is attributed to large pyroelectric coefficients in a favorable temperature range resulting from a ferroelectric-paraelectric phase transition of second order at 327 K, small dielectric constant, and moderate heat capacity. In addition, amantadine formate is relatively lightweight, soft, transparent, low-cost, and non-toxic, adding value to its potential applications in flexible electronics. Our results demonstrate that a new type of pyroelectrics can exist in organic compounds.
热释电材料是一类极性化合物，其在温度变化时会输出电信号。随着柔性电子学的迅速发展，人们对有机热释电材料有很高的需求。然而，大多数有机物的热释电系数较低或工作温度较低。迄今为止，在全有机材料中实现优异的热释电性能仍然是一项挑战。在此，我们报告发现了甲酸金刚烷胺，一种具有超高电压优值（ ）的全有机热释电材料，在室温附近超过了所有其他已知有机物以及商用硫酸三甘肽、钽酸锂。高优值的关键归因于在327 K发生的二级铁电 - 顺电相变在有利温度范围内产生的大热释电系数、小介电常数和适度的热容量。此外，甲酸金刚烷胺相对轻质、柔软、透明、低成本且无毒，这为其在柔性电子学中的潜在应用增添了价值。我们的结果表明，有机化合物中可以存在一种新型的热释电材料。
