压电半导体光电池输出特性的机械调控研究  

Study on Mechanical Modulation of Output Characteristics in Piezoelectric Semiconductor Photovoltaic Cells

作　　者：杨浩桢 刘金喜 杨万里 胡元太 YANG Haozhen;LIU Jinxi;YANG Wanli;HU Yuantai(School of Aerospace Engineering,Huazhong University of Science and Technology,Wuhan 430074,P.R.China;Department of Engineering Mechanics,Shijiazhuang Tiedao University,Shijiazhuang 050043,P.R.China)

机构地区：[1]华中科技大学航空航天学院,武汉430074 [2]石家庄铁道大学工程力学系,石家庄050043

出　　处：《应用数学和力学》2024年第10期1279-1287,共9页Applied Mathematics and Mechanics

基　　金：国家自然科学基金(12232007,12102141,11972164,U21A20430);河北省智能材料力学协同创新中心开放课题(KF2024002)。

摘　　要：压电PN结光电池的性能与其内部的势垒构型和载流子分布密切相关,因此其输出性能可以通过压电性诱导的压电势改变载流子的输运特性来调控.然而,经典PN结模型因引入了耗尽层等假设而无法描述势垒区内多物理场与载流子的耦合作用,导致其预测结果严重失真.因此,针对光电池的核心基本单元PN结,建立了力-电-光与载流子全域耦合作用的多场耦合模型,研究了外加机械载荷对ZnO光电池输出特性的调控机理.结果表明:光照强度固定时,光电池的短路电流、开路电压和最大输出功率均随着压应力的增大而逐渐增加;相反,拉应力不利于光电池性能的提升.此外,研究还发现,加载区范围大于光照区或n/p区单侧同时受到光照和压应力作用时的调控效果更佳.The performances of piezoelectric PN junction photovoltaic cells are closely related to the internal potential barrier configurations and the distributions of carriers,and can be tuned through carrier transport characteristic changes by the piezopotentials under the piezo-effect.However,the classical PN junction model fails to describe the coupling effect between multiple physical fields and carriers in the potential barrier zone due to the depletion layer assumptions and others,and in turn gives severely distorted results.Herein a mechanics-electricity-photonics-carrier global multi-field coupling model was developed to investigate the tuning mechanism for mechanical loadings on the output characteristics of ZnO photovoltaic cells.The numerical results indicate that,the short-circuit current,the open-circuit voltage,and the maximum output power of the photovoltaic cell increase with the compressive stress under a fixed light intensity,while tensile stresses are not conducive to improving the performances of photovoltaic cells.In addition,a better tuning effect occurs with a loading region wider than the illuminated region,or with both these two external fields acting in the same side of the n/p-zone.

关 键 词：ZnO PN结 压电效应 光电池 数值模拟 

分 类 号：O29[理学—应用数学]