Wave-particle drag effect (WPDE) induced by the interaction between an elastic wave and the carriers in a piezoelectric semiconductor (PS) structure has already become a current hot issue in the field of acoustoelectric conversion. Most related studies are based on the linearized assumption that carrier concentrations are limited to present very small variations such that the nonlinear drift current term can be ignored at all. In this study, the nonlinear effect between an elastic wave and carriers in a PS rod is discussed in detail. The multi-field coupled nonlinear differential equations are numerically solved by finite element method. It is found that the electric transient disturbances are deviated from the standard harmonic distribution by comparing with the linear solutions. The carriers driven by the alternating electric field are more likely to accumulate at the crest when their drift movement motion is consistent with the propagation direction of the traveling wave. Oppositely, the troughs of the carriers tend to depletion due to the nonnegative property of the carriers. In addition, the nonlinear characteristics of the carriers and the dispersion properties of the coupled wave become stronger with the decreasing doping concentrations. These studies will provide guidance for theoretical analysis of wave propagating in PSs and design of acoustoelectric devices.

压电半导体（PS）结构中弹性波与载流子相互作用引起的波粒阻力效应（WPDE）已成为当前声电转换领域的热点问题。大多数相关研究都是基于线性化假设，即载流子浓度仅限于呈现非常小的变化，从而可以完全忽略非线性漂移电流项。在本研究中，详细讨论了 PS 棒中弹性波和载流子之间的非线性效应。采用有限元法对多场耦合非线性微分方程进行数值求解。通过与线性解的比较发现，电暂态扰动偏离了标准谐波分布。当交变电场驱动的载流子的漂移运动与行波的传播方向一致时，它们更有可能在波峰处积累。相反，由于载流子的非负特性，载流子的波谷趋于耗尽。此外，随着掺杂浓度的降低，载流子的非线性特性和耦合波的色散特性变得更强。这些研究将为波在PS中传播的理论分析和声电器件的设计提供指导。随着掺杂浓度的降低，载流子的非线性特性和耦合波的色散特性变得更强。这些研究将为波在PS中传播的理论分析和声电器件的设计提供指导。随着掺杂浓度的降低，载流子的非线性特性和耦合波的色散特性变得更强。这些研究将为波在PS中传播的理论分析和声电器件的设计提供指导。