Surface Elastic Effects on Electromechanical Responses of a Piezoelectric Semiconducting Nanobeam  

作　　者：Aowen Bao Xiaobao Li Yuxue Pu Chunxiao Zhan 

机构地区：[1]School of Civil Engineering,Hefei University of Technology,Hefei,230009,China

出　　处：《Acta Mechanica Solida Sinica》2024年第4期598-612,共15页固体力学学报（英文版）

基　　金：support of the National Natural Science Foundation of China[Grant number:11702076];the Natural Science Foundation of Anhui Province[Grant numbers:2208085MA17 and 2208085ME129].

摘　　要：Piezoelectric semiconductors(PSCs)find extensive applications in modern smart electronic devices because of their dual properties of being piezoelectric and semiconductive.With the increasing demand for miniaturization of these devices,the performance of their components needs to be carefully designed and optimized,especially when reduced to nanosize.It has been shown that surface elastic properties play a substantial role in the mechanical performance of nanoscale materials and structures.Building on this understanding,the surface elastic effects,encompassing surface residual stress,surface membrane stiffness,and surface bending stiffness,are comprehensively taken into account to explore the electromechanical responses of a PSC nanobeam.Additionally,the flexoelectric effect on their responses is also systematically studied.The results of this work reveal that surface elastic properties predominantly influence mechanical performance,while the flexoelectric effect plays a more dominant role in electric-related quantities at the nanoscale.Notably,the significance of surface bending rigidity,which was often underestimated in the earlier literature,is demonstrated.Furthermore,owing to the flexoelectric effect,the linear distribution of electric potential and charge carriers along the length transforms into a nonlinear pattern.The distributions of electric potential and charge carriers across the cross section are also evidently impacted.Moreover,the size-dependent responses are evaluated.Our findings may provide valuable insights for optimizing electronic devices based on nanoscale PSCs.

关 键 词：Surface elastic effect FLEXOELECTRICITY Size effect Piezoelectric semiconductor 

分 类 号：TN304[电子电信—物理电子学]