青岛大学本科生毕业论文（设计）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PAGEIII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、性能及广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为研究对象，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研究。关键词Bi2Fe4O9光电转换共沉淀法AbstractAshumans’biggestchallengesinthe21stcentury,renewableenergyandenvironmentalpollution，whichgetmoreandmoreattention，isreducingseriously.Allkindsofrenewableenergyisalsobecomingincreasinglysuperiority,andso,peoplewilllooktothesolarenergyinsuccession.Bismuthferriteisgettingmoreandmoreattentionowingtotheirpeculiarstructure,performanceandbroadapplicationprospects.Photoconductivity/photocurrent/photovoltaiceffectshavebeenobservedinBiFeO3thinfilms,nanocubesandplate-shapedcrystalsundervisible-lightirradiation,respectively.ThispaperchoosesBi2Fe4O9astheresearchobject,usingachemistryco-precipitationprocess（NH4OHandNaOH，astheprecipitationagent）realizedthepurephaseBi2Fe4O9nanocrystallinepreparation，thenteststheBi2Fe4O9nanocrystalsphotoelectricconversionperformance，showstheX-raydiffraction(XRD)patternandatypicalscanningelectronmicroscopy(SEM)micrographofthenanocrystals.oftheBi2Fe4O9nanocrystals.KeywordsBi2Fe4O9,photoelectric,co-precipitationprocess目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc327212239"摘要PAGEREF_Toc327212239\hIHYPERLINK\l"_Toc327212241"前言PAGEREF_Toc327212241\h1HYPERLINK\l"_Toc327212242"第1章绪论PAGEREF_Toc327212242\h2HYPERLINK\l"_Toc327212243"1.1光电效应PAGEREF_Toc327212243\h2HYPERLINK\l"_Toc327212244"1.1.1光电效应概述PAGEREF_Toc327212244\h2HYPERLINK\l"_Toc327212245"1.1.2光伏发电的原理PAGEREF_Toc327212245\h2HYPERLINK\l"_Toc327212246"1.2光电材料的研究现状及趋势PAGEREF_Toc327212246\h3HYPERLINK\l"_Toc327212247"1.2.1硅太阳能电池PAGEREF_Toc327212247\h3HYPERLINK\l"_Toc327212248"1.2.2多晶体薄膜电池PAGEREF_Toc327212248\h4HYPERLINK\l"_Toc327212249"1.2.3纳米晶电池PAGEREF_Toc3272