压电光电子学器件在信息、能源、生物、医疗以及国防等重大工程领域有广泛应用前景，是当前科学与技术研究的前沿和热点问题，对压电光电子学器件结构的关键力学问题开展研究至关重要。项目拟针对具有变形-极化-载流子耦合的压电光电子学器件结构，基于连续介质力学理论和半导体物理学基本方程，采用变形-极化-载流子的全耦合模型、考虑挠曲电性和大变形等因素，建立适用于压电电子学器件分析的高效结构理论模型。在此基础上，研究压电光电子学器件在机械荷载作用下的多场耦合力学行为，考察挠曲电性、大变形、应力/应变模式、极化方向、初始载流子浓度、掺杂情况、边界条件等复杂因素对压电光电子学器件性能的影响，揭示基于应力/应变的调控机理，为新型压电半导体光电子器件的设计和开发提供理论支撑。

Piezo-phototronic devices will have a wide application in the engineering fields of information, energy, biology, medical, and national defense and so on in the future. It is important to study multi-field coupling mechanical behaviors of piezo-phototronic devices. The project will adopt the fully coupled deformation-polarization-carrier model, taking flexoelectricity and large deformation into consideration, to establish multi-field coupling structural theory for piezo-phototronic devices. Based on the developed theoretical model, the project will investigate the multi-field coupling mechanical behaviors of piezo-phototronic devices under mechanical forces, and study the effect of flexoelectricity, large deformation, stress/strain modes, polarization, carrier concentration, doping, and boundary condition on device performance, and reveal the stress-based tuning mechanism of device performance. The project will lay a theoretical foundation for designing novel piezo-phototronic devices.