Li Bingyue, Xie Zude, Liu Hanzhong, Tang Liming, Chen Keqiu
School of Physics and Electronics, Hunan University, Changsha 410082, China.
Materials (Basel). 2023 Apr 14;16(8):3107. doi: 10.3390/ma16083107.
Due to their high electromechanical coupling and energy density properties, ultrathin piezoelectric films have recently been intensively studied as key materials for the construction of miniaturized energy transducers, and in this paper we summarize the research progress. At the nanoscale, even a few atomic layers, ultrathin piezoelectric films have prominent shape anisotropic polarization, that is, in-plane polarization and out-of-plane polarization. In this review, we first introduce the in-plane and out-of-plane polarization mechanism, and then summarize the main ultrathin piezoelectric films studied at present. Secondly, we take perovskite, transition metal dichalcogenides, and Janus layers as examples to elaborate the existing scientific and engineering problems in the research of polarization, and their possible solutions. Finally, the application prospect of ultrathin piezoelectric films in miniaturized energy converters is summarized.
由于其高机电耦合和能量密度特性，超薄压电薄膜最近作为构建小型化能量换能器的关键材料受到了深入研究，在本文中我们总结了研究进展。在纳米尺度，即使是几个原子层，超薄压电薄膜也具有显著的形状各向异性极化，即面内极化和面外极化。在本综述中，我们首先介绍面内和面外极化机制，然后总结目前研究的主要超薄压电薄膜。其次，我们以钙钛矿、过渡金属二硫属化物和Janus层为例，阐述极化研究中存在的科学和工程问题及其可能的解决方案。最后，总结了超薄压电薄膜在小型化能量转换器中的应用前景。
