Islam Md Sherajul, Zamil Md Yasir, Mojumder Md Rayid Hasan, Stampfl Catherine, Park Jeongwon
Department of Electrical and Electronic Engineering, Khulna University of Engineering and Technology, Khulna, 9203, Bangladesh.
Department of Materials Science and Engineering, Khulna University of Engineering and Technology, Khulna, 9203, Bangladesh.
Sci Rep. 2021 Sep 21;11(1):18669. doi: 10.1038/s41598-021-98130-5.
The high electronegativity between the atoms of two-dimensional (2D) group-III nitrides makes them attractive to demonstrating a strong out-of-plane piezo-electricity effect. Energy harvesting devices can be predicted by cultivating such salient piezoelectric features. This work explores the tribo-piezoelectric properties of 2D-indium nitride (InN) as a promising candidate in nanogenerator applications by means of first-principles calculations. In-plane interlayer sliding between two InN monolayers leads to a noticeable rise of vertical piezoelectricity. The vertical resistance between the InN bilayer renders tribological energy by the sliding effect. During the vertical sliding, a shear strength of 6.6-9.7 GPa is observed between the monolayers. The structure can be used as a tribo-piezoelectric transducer to extract force and stress from the generated out-of-plane tribo-piezoelectric energy. The A-A stacking of the bilayer InN elucidates the highest out-of-plane piezoelectricity. Any decrease in the interlayer distance between the monolayers improves the out-of-plane polarization and thus, increases the inductive voltage generation. Vertical compression of bilayer InN produces an inductive voltage in the range of 0.146-0.196 V. Utilizing such a phenomenon, an InN-based bilayer compression-sliding nanogenerator is proposed, which can tune the generated tribo-piezoelectric energy by compressing the interlayer distance between the InN monolayers. The considered model can render a maximum output power density of ~ 73 mWcm upon vertical sliding.
二维III族氮化物原子之间的高电负性使其在展示强面外压电效应方面具有吸引力。通过培育这种显著的压电特性，可以预测能量收集装置。这项工作通过第一性原理计算探索了二维氮化铟（InN）作为纳米发电机应用中有前景的候选材料的摩擦电-压电特性。两个InN单层之间的面内层间滑动导致垂直压电性显著增强。InN双层之间的垂直电阻通过滑动效应产生摩擦学能量。在垂直滑动过程中，单层之间观察到6.6 - 9.7 GPa的剪切强度。该结构可作为摩擦电-压电换能器，从产生的面外摩擦电-压电能量中提取力和应力。双层InN的A - A堆叠表现出最高的面外压电性。单层之间层间距离的任何减小都会改善面外极化，从而增加感应电压的产生。双层InN的垂直压缩产生0.146 - 0.196 V范围内的感应电压。利用这种现象，提出了一种基于InN的双层压缩-滑动纳米发电机，它可以通过压缩InN单层之间的层间距离来调节产生的摩擦电-压电能量。所考虑的模型在垂直滑动时可产生约73 mW/cm²的最大输出功率密度。
