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时间:2020-04-21
《氮掺杂二氧化钛纳米棒阵列的制备和光电转化性能表征-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第8卷第9期中国科技论文Vo1.8No.92013年9月CHINASCIENCEPAPERSep.2013氮掺杂二氧化钛纳米棒阵列的制备和光电转化性能表征孙琼,孙先淼,李阳,董立峰(青岛科技大学材料科学与工程学院,山东青岛266O42)摘要:以氨水为氮源,在掺杂氟的Sn()2导电玻璃(SnOz:F,FTO)基底上通过水热法生长出氮掺杂单晶金红石相TiO2纳米棒阵列。XPS检测证明,底物中只有很少量的氮元素能进入到TiOz中,并以(卜Ti—N形态存在。随着氮掺杂浓度的升高,Ti02纳米棒长度增加,(002)晶面相对
2、于未掺杂TiO2生长迅速。样品的吸收光谱未发生明显变化,说明半导体的禁带宽度(或能隙大小)没有受到氮掺杂的影响。在光电转化中,体系在模拟太阳光辐射下的光电流响应和外量子效率都有大幅改善,最高值分别达到0.15ma/em2和3.1,均为空白TiOz的3.8倍。然而,氮浓度的继续增加会导致Ti()2纳米棒团聚,促使光致电荷在传输过程中发生复合现象;过量的氨水还会与底物直接发生水解反应,不利于基底上纳米棒的生长。所以,适量浓度的氮掺杂TiOz纳米棒阵列是一种具有发展前景的太阳能电池材料。关键词:氮掺杂;Ti()2纳米棒
3、阵列;形貌表征;光电流响应中图分类号:0484.4文献标志码:A文章编号:2095—2783(2013)09—0883—05Preparationandph0t0electricalconversionperformanceofnitrogendopedtitaniumdioxidenanorodarraysSunQiong,SunXianmiao,LiYang,DongLifeng(CollegeofMaterialsScienceandEngineering,QingdaoUniversityofScienc
4、eandTechnology,Qingdao,Shandong266042,China)Abstract:Nitrogendopedsingle-crystalrutileTiO2nanorodarrayshavebeenpreparedOiltransparentconductivefluorine-dopedtinoxide(FTO)substratesthroughafacilehydrothermalprocess,usingaqueousammoniaasnitrogensource.Thecharac
5、teriza—tionbvXPSindicatedthatonlyasmallamountofnitrogeninreactantswasaddedintoTi02andformedo—Ti~Nstructure.Thenanorodlengthanddiffractionintensityofthe(002)latticeplaneincreasedsharplywiththedopingconcentration.TheabsorptionspectrumofN-dopedsamplesdidnotchang
6、eevidentlyincomparisontoundopedsamples,indicatingthatthedopinginthisstudyhadlittleeffectonbandgapenergy.However,photocurrentresponseandexternalquantumefficiencyimprovedobviouslyundertheirradiationofasolarsimulator,andthehighestvaluesreached0.15mA/em2and3.1,re
7、spectively,bothofwhichwerea—bout3.8timesofthoseofundopedTi02.Ontheotherhand,theintroductionoftOOmuchnitrogenwouldinducetheaggregationofTi02nanorods,whichleadstOtherecombinationofphotogeneratedcharges.Excessiveammoniareacteddirectlywiththere—actantsthroughtheh
8、ydrolysis,whichthusinhibitedthegrowthofthenanorodsonFrOsubstrates.Therefore,theTi02nanoroddopedwithmoderatenitrogenhaspotentialapplicationsinsolarcells.Keywords:nitrogendoping;TiO2nanorod
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