López-Suárez Miquel, Pruneda Miguel, Abadal Gabriel, Rurali Riccardo
Departament d'Enginyeria Electrònica; Universitat Autònoma de Barcelona; E-08193 Bellaterra, Barcelona, Spain.
Nanotechnology. 2014 May 2;25(17):175401. doi: 10.1088/0957-4484/25/17/175401. Epub 2014 Apr 10.
We study the dynamics of h-BN monolayers by first performing ab-initio calculations of the deformation potential energy and then solving numerically a Langevine-type equation to explore their use in nonlinear vibration energy harvesting devices. An applied compressive strain is used to drive the system into a nonlinear bistable regime, where quasi-harmonic vibrations are combined with low-frequency swings between the minima of a double-well potential. Due to its intrinsic piezoelectric response, the nonlinear mechanical harvester naturally provides an electrical power that is readily available or can be stored by simply contacting the monolayer at its ends. Engineering the induced nonlinearity, a 20 nm2 device is predicted to harvest an electrical power of up to 0.18 pW for a noisy vibration of 5 pN.
我们通过首先对变形势能进行从头算计算，然后数值求解兰格文型方程来研究h-BN单层的动力学，以探索它们在非线性振动能量收集装置中的应用。施加的压缩应变用于将系统驱动到非线性双稳状态，在该状态下，准谐波振动与双阱势极小值之间的低频摆动相结合。由于其固有的压电响应，非线性机械收集器自然会提供一种电能，该电能很容易获取，或者通过简单地在单层两端接触就可以存储。通过设计诱导非线性，预计一个20 nm²的器件在5 pN的噪声振动下可收集高达0.18 pW的电能。
