铁电体的光伏效应  

Photovoltaic effect in ferroelectrics

作　　者：蔡田怡[1] 雎胜[1] Cai Tian-Yit;Ju Sheng(School of Physical Science and Technology,Soochow University,Suzhou 215006,China)

机构地区：[1]苏州大学物理科学与技术学院,苏州215006

出　　处：《物理学报》2018年第15期228-240,共13页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11374220;11104193);国家重点基础研究发展计划(批准号:2014CB920900);江苏省青蓝工程;苏州大学东吴学者计划资助的课题~~

摘　　要：介绍了铁电光伏效应的发展历史和现状,通过与传统半导体p-n结光伏器件比较,旨在阐述铁电光伏器件非比寻常的优点和重要的应用前景.铁电光伏效应分为体光伏效应和反常光伏效应,多种物理机制已被发现,无疑为铁电光伏效应的提高指明了方向.还对钙钛矿氧化物、卤化物和双钙钛矿结构氧化物等铁电体中的光伏效应进行了阐述,讨论了通过引入新的自由度实现多功能性光伏器件的可能性.Ferroelectric oxides are attractive materials for constructing efficient solar cells. The mechanism includes the anomalous photovoltaic effect（APE） and the bulk photovoltaic effect（BPE）. The BPE refers to the generation of a steady photocurrent and above-bandgap photovoltage in a single-phase homogeneous material lacking inversion symmetry. The mechanism of BPE is different from the typical p-n junction-based photovoltaic mechanism in heterogeneous materials.We survey the history, development and recent progress in understanding the mechanisms of BPE, with a focus on the shift current mechanism, an intrinsic BPE that is universal to all materials lacking inversion symmetry. We also review the important factors to the APE, i.e., the domain boundary, the Schottcky junction, and the depolarization field.The recent successful applications of inorganic and hybrid perovskite structured materials in solar cells emphasize that ferroelectrics can be used in conventional photovoltaic architectures. We review the development in this field, with a particular emphasis on the perovskite materials and the theoretical explanations. In addition to discussing the implication of a ferroelectric absorber layer and the solid state theory of polarization, the design principles and prospect for highefficiency ferroelectric photovoltaics are also mentioned. Considering the coupling between the degrees of freedom, some special ferroelectrics are expected to have prominent multi-functionality. With the introduction of the additional degree of freedom, some ferroelectrics, i.e., Sc FexCr1-xO3（1/6 x 5/6）, can be a promising candidate for highly efficient solar cells and spin photovoltaic devices.

关 键 词：铁电体 光伏效应 多铁性材料 太阳能电池 

分 类 号：TM22[一般工业技术—材料科学与工程] TM914.4[电气工程—电工理论与新技术]