题 目：Bi2Fe4O9 纳米晶光电转换性能测量 学 院： 物理科学学院 专 业： 应用物理学 摘 要可再生能源的日渐减少和环境污染的日益严重作为人类在 21 世纪面临的最大困难，越来越多的关注，太阳能安全、清洁、取之不尽。于是，人们将目光纷纷投向了太阳能。而铋铁系化合物由于其特有的结构、性能及宽阔的应用前景得到各方面越来越多的关注，在可见光照射下，BiFeO3薄膜、纳米颗粒和单晶的光电性质都已被报道。本论文选择 Bi2Fe4O9 为讨论对象，分别以 NaOH和 NH4OH 作为沉淀剂，利用共沉淀法制备出了纯相 Bi2Fe4O9 纳米晶，对Bi2Fe4O9 纳米晶进行了 XRD 表征和 SEM 分析，并对其光电转换性能进行了讨论。关键词 Bi2Fe4O9 光电转换 共沉淀法AbstractAs humans’ biggest challenges in the 21st century, renewable energy and environmental pollution，which get more and more attention，is reducing seriously. All kinds of renewable energy is also becoming increasingly superiority, and so, people will look to the solar energy in succession. Bismuth ferrite is getting more and more attention owing to their peculiar structure, performance and broad application prospects. Photoconductivity/ photocurrent/photovoltaic effects have been observed in BiFeO3 thin films, nanocubes and plate-shaped crystals under visible-light irradiation, respectively. This paper chooses Bi2Fe4O9 as the research object, using a chemistry co-precipitation process（NH4OH and NaOH，as the precipitation agent）realized the pure phase Bi2Fe4O9 nanocrystalline preparation ， then tests the Bi2Fe4O9 nanocrystals photoelectric conversion performance ， shows the X-ray diffraction (XRD) pattern and a typical scanning electron microscopy (SEM) micrograph of the nanocrystals.of the Bi2Fe4O9 nanocrystals.Key words Bi2Fe4O9, photoelectric, co-precipitation process目 录摘 要...............................................................................................................................I前 言....
