标题:
Au纳米颗粒/BFO/ZnO复合结构的光电化学性质的提高The Enhancement of Au Nanoparticles/ BFO/ZnO Composite Structure at Photoelectrochemical Properties
作者:
古寿林, 吴星波, 刘凯
关键字:
Au纳米颗粒, BFO薄膜, ZnO过渡层, 光电化学性能Au Nanoparticles, Thin BFO Films, ZnO Buffer Layer, Photoelectrochemical Properties
期刊名称:
《Applied Physics》, Vol.6 No.11, 2016-11-18
摘要:
本文通过磁控溅射技术在ITO导电玻璃上制备了多晶的铁酸铋(BFO)薄膜，并负载了适量的Au纳米颗粒来提高样品的光电流。Au纳米颗粒的表面等离子共振效应以及金属/半导体界面处形成的肖特基势垒均有利于提高电子-空穴对的分离。10 nm ZnO过渡层的引入使得BFO薄膜表面的平整度，致密性，结晶度得到了很好的改善，从而减小了BFO薄膜的漏电流，提高了BFO薄膜的剩余极化。BFO薄膜经过极化后产生的退极化场也促进了电子-空穴对的分离，减少了光生载流子的复合，从而可以获得更好的光电化学性能。
Polycrystalline BiFeO3 (BFO) film was synthesized on the ITO conductive glass by magnetron sputtering technique, and the appropriate amount of gold nanoparticle (Au Nps) was successfully loaded to improve the photocurrent of the sample. The surface plasma resonance (LSPR) effect of gold nanoparticles, and the formation of the Schottky barrier of metal/semiconductor interface are beneficial to accelerate the separation of electronic-hole. The BFO/10 nm ZnO films show denser and smoother surface and higher degree crystallization, which is beneficial to reduce the leakage current density and achieve larger double-remant-polarization value. The generation of depolarization field by polaring BFO film also promotes the separation of the electronic-hole, and prevents the rapid recombination of photogenic charge carrier, which can obtain better photoelectrochemical properties.