作　　者： ; ; ; ; ; ;

机构地区： 重庆科技学院冶金与材料工程学院

出　　处： 《中国陶瓷》 2016年第4期1-5,11,共6页

摘　　要： 通过脉冲激光沉积技术在(001)方向的La_(0.7)Sr_(0.3)Mn O_3/Sr Ti O_3上制备了厚度为500 nm的Bi_(0.9)La_(0.1)FeO_3铁电薄膜,研究了薄膜中的光伏效应。结果表明,铁电薄膜中短路光电流的方向不依赖于整流方向,但始终与极化方向相反,其大小随极化强度的增加变大,并且在净极化强度为零时短路光电流恰好为零。然而,当畴壁浓度或氧空位分布的影响足以补偿由极化所产生的效果时,短路光电流不依赖于极化方向。通过改变畴壁浓度或者氧空位分布,不改变极化方向时可以使得短路光电流的方向发生转变;通过改变氧空位的分布,极化方向改变时,光电流的方向也可以不变。我们的结果为通过改变极化方向、氧空位分布、界面势垒的高度以及电畴密度等因素来调控铁电薄膜中光伏效应具有一定的价值。 Ferroelectrics, which should have higher conversion efficiency theoretically due to its abnormal photovoltaic effect（the photovoltage is as large as 103 ~ 105 V/cm）, has become a new focus of attention in potential application prospect of solar photovoltaic field. However, the photo-electric conversion efficiency is needed to be enhanced further because of its relatively wide band gap and lower conductance. Therefore, it is of great importance to make clear the mechanism of photovoltaic effect so as to increase the conversion efficiency. Yet, there is no final conclusion about the origin of photovoltaic effect and it is still in controversial. Based on above consideration, this paper reviews the research progress in photovoltaic effect of ferroelectric thin films, the mechanisms of ferroelectric photovoltaic effect are elaborated in details and some programs urgent needed solved as also proposed.

关 键 词： 铁电薄膜 光伏效应 转换效率 机制 进展

领　　域： [电气工程] [一般工业技术]