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1、_______________________________________________________________________________www.paper.edu.cn逐层丝网印刷制备TiO2纳米晶电极及其在染料敏化太阳能电池中的应用11,21*1宋文哲,李康,孙岳明,章舒(1.东南大学化学化工系,江苏,南京,210096;2.淮阴师范学院化学系,江苏,淮安,223001)摘要用溶胶-凝胶法制备了TiO2微粒粒径在9.7nm左右的TiO2溶胶,通过丝网印刷逐层沉积到ITO表面,TiO2膜厚度与层数呈线性增加,易于控制。SEM照片显示高温烧结后所得的TiO2纳
2、米晶电极表面粒子直径在70nm左右,分布均匀,孔隙较大。以TiO2电极为工作电极,酞菁为敏化染料,KI0.5M/I20.05M碳酸丙烯酯溶液为电解质溶液,镀银的ITO为对电极的染料敏化太阳能电池的最高单色光光电转化效率为12.7%。逐层丝网印刷法适合制作大面积TiO2纳米晶电极,具有工业化价值。关键词太阳能电池;纳米晶;TiO2;丝网印刷;酞菁;敏化PreparationofNanocrystallineTiO2ElectrodebyLayer-bye-layerScreenPrintinganditsApplicationinDye-sensitizedSolarCell11,
3、21*1SongWenzhe,LiKang,SunYueming,ZhangShu(1.DepartmentofChemistryandChemicalEngineering,SoutheastUniversity,Nanjing,Jiangsu,210096,PRC;2.DepartmentofChemistry,NormalInstituteofHuaiyin,Huai-an,Jiangsu,223001,PRC)AbstractTheTiO2colloidalsolutionwaspreparedbythesol-gelmethod,inwhichthediameterso
4、fmostTiO2nanoparticulateswereabout9.7nm.Bylayer-by-layerscreenprinting,TiO2multilayeredfilmswereobtained.Thelayer-by-layerassemblyoftheTiO2filmsproceededlinearlyasshownbysequentialUV-visabsorption.ThemorphologyofTiO2nanocrystyllineelectrodesinteredwascharacterizedusingscanningelectronicmicros
5、copyandthesizesofparticulatesonthesurfaceapproximatelywere70nm.ThemorphologyofrepresentativefieldonTiO2electrodesurfacemagnifieddifferenttimesshowedtheuniformityofthetotal.Sothelayer-by-layerscreenprintingcanbeappliedinpreparationofTiO2filmswithlargedimension.TheTiO2electrodewasusedasworkinge
6、lectrodeforphthalocyanine-sensitizedsolarcell.Themaximumincidentphoton-to-electronconversionefficiencyof12.7%wasachievedatwavelengthof700nm.Keywordssolarcell;nanocrystallin;TiO2;screenprinting;phthalocyanine;sensitization自从Grätzel报道了高效率(10%)的染料敏化太阳能电池(DSSC)以来,DSSC就被[1-3]认为是最有可能取代传统硅太阳能电池的新型太阳
7、能电池,受到了广泛关注。作为DSSC[4,5]的关键组成之一,纳米晶半导体(一般为TiO2)电极的制备方法有多种,除旋涂,浅刻[6,7][8][9][10][11,12]带,喷雾热解,溅射,和气相沉积等方法以外,戴松元等也曾利用丝网印刷制[13]得了性能较好TiO2纳米晶膜。He等人在TiO2溶胶中加入带不同电荷的高分子电解质,利用静电作用逐层沉积,从分子级别上来控制TiO2纳米晶膜的厚度和孔度。在此,我们通过逐层沉积来改进丝网印刷术,得到一种简易的薄膜厚度可控的TiO2多孔电极