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La/Ni掺杂对BiFeO3薄膜磁性及光学特性的影响研究
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Abstract:
本论文研究A、B位元素掺杂对铁酸铋(BiFeO3，简称BFO)物理性能的影响。具体开展BiFeO3，Bi0.9La0.1FeO3 (BLFO)，Bi0.9 Ni0.1O3 (BFNO)薄膜的制备及其物理特性的研究。实验结果表明：通过脉冲激光沉积方法可以制备纯相结构的BFO体系薄膜；Ni和La元素的掺杂均能有效提高BFO体系的铁磁性能，同时能改变BFO体系的禁带宽度，从而改变其光学特性，La、Ni掺杂使得BFO体系的开路电压增大，提高BFO体系的的光伏效应，表明掺杂有利于BFO体系对可见光的吸收，从而有可能提高器件的光电转化效率。
In this paper, the effect of A-and B-site element doping on the physical properties of BiFeO3 (shortened as BFO) was studied. The preparation and physical properties of Bi0.9FeO3 (BFO), Bi0.9La0.1FeO3 (BLFO), Bi0.9 Ni0.1O3 (BFNO) thin films were studied in detail. The results show that, the BFO films with pure phase structure can be prepared by pulsed laser deposition (PLD) method. Doping with Ni and La elements can effectively improve the ferromagnetism of BFO systems and change the forbidden bandwidth of BFO systems, and therefore change the optical properties of the systems. Doping of La and Ni results in the increase of the open circuit voltage, so as to enhance the photovoltaic effect of BFO systems. This result indicates that element doping is beneficial to the absorption of visible light for the BFO systems, which can potentially improve the photoelectric conversion efficiency of the device.
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