arXiv · 2408.11379
High quality epitaxial piezoelectric and ferroelectric wurtzite Al$_{1-x}$Sc$_x$N thin films
Abstract
Piezoelectric and ferroelectric wurtzite are promising to reshape modern microelectronics because they can be easily integrated with mainstream semiconductor technology. Sc doped AlN (Al$_{1-x}$Sc$_x$N) has attracted much attention for its enhanced piezoelectric and emerging ferroelectric properties, yet the commonly used sputtering results in polycrystalline Al$_{1-x}$Sc$_x$N films with high leakage current. Here we report the pulsed laser deposition of single crystalline epitaxial Al$_{1-x}$Sc$_x$N thin films on sapphire and 4H-SiC substrates. Pure wurtzite phase is maintained up to $x = 0.3$ with minimal oxygen contamination. Polarization is estimated to be 140 $\mu$C/cm$^2$ via atomic scale microscopy imaging and found to be switchable via a scanning probe. The piezoelectric coefficient is found to be 5 times of undoped one when $x = 0.3$, making it desirable for high frequency radiofrequency (RF) filters and three-dimensional nonvolatile memories.
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Yang Zeng, Yihan Lei, Yanghe Wang, Mingqiang Cheng, Luocheng Liao, Xuyang Wang, Jinxin Ge, Zhenghao Liu, Wenjie Ming, Chao Li, Shuhong Xie, Jiangyu Li, Changjian Li. 2024-08-21. High quality epitaxial piezoelectric and ferroelectric wurtzite Al$_{1-x}$Sc$_x$N thin films. https://arxiv.org/abs/2408.11379
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