Preparation and photoelectric properties of Ho^(3+)-doped titanium dioxide nanowire downconversion photoanode  

TiO_2:Ho^(3+)纳米线下转换光阳极的制备及其光电性能(英文)

作　　者：李月英[1,2,3] 郝洪顺[1,2,3] 王丽君[1,2,3] 郭伟华[1,2,3] 苏青[1,2,3] 秦磊[3] 高文元[1,2,3] 刘贵山[1,2,3] 胡志强[1,2,3] 

机构地区：[1]大连工业大学无机非金属材料工程系,大连116034 [2]大连工业大学新材料与材料改性省高校重点实验室,大连116034 [3]大连工业大学国家海洋食品工程技术研究中心,大连116034

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第12期3974-3979,共6页中国有色金属学报（英文版）

基　　金：Project(2012FU125X03)supported by Open Research Fund Project of National Engineering Research Center of Seafood;China;Project(2011–191)supported by the Key Science and Technology Platform of Liaoning Provincial Education Department;China;Project(2010–354)supported by the Science and Technology Platform of Dalian;China

摘　　要：Ho^3＋-doped titanium dioxide（TiO2：Ho^3＋） downconversion（DC） nanowires were synthesized through a simple hydrothermal method followed by a subsequent calcination process after being immersed in Ho（NO3）3 aqueous solution. Moreover, TiO2：Ho^3＋ nanowires（HTNWs） were used as the photoanode in dye-sensitized solar cells（DSSCs） to investigate their photoelectric properties. Scanning electron microscopy（SEM） and X-ray diffraction（XRD） were used to characterize the morphology and structure of the material, respectively. The photofluorescence and ultraviolet-visible absorption spectra of HTNWs reveal a DC from the near and middle ultraviolet light to visible light which matches the strong absorbed region of the N719 dye. Compared with the pure TNW photoanode, HTNWs DC photoanodes show greater photovoltaic efficiency. The photovoltaic conversion efficiency（η） of the DSSCs with HTNWs photoanode doped with 4% Ho2O3（mass fraction） is two times that with pure TNW photoanode. This enhancement could be attributed to HTNWs which could extend the spectral response range of DSSCs to the near and middle ultraviolet region and increase the short-circuit current density（Jsc） of DSSCs, thus leading to the enhancement of photovoltaic conversion efficiency.采用水热法制备Ti O2纳米线前驱体,将其浸入Ho(NO3)3水溶液并取出煅烧,得到Ti O2:Ho3+下转换纳米线,用其制备染料敏化太阳能电池的光阳极,探讨其光电性能。用扫描电镜和X射线衍射分别表征Ti O2:Ho3+纳米线的形貌和结构。荧光光谱和紫外-可见吸收光谱显示Ti O2:Ho3+下转换纳米线可以将近紫外光和中紫外光转化为可以被N719染料吸收的可见光。与纯Ti O2纳米线作为光阳极的电池相比,以Ti O2:Ho3+下转换纳米线作为光阳极的电池有较好的光电转换效率,且当Ho3+掺杂量为4%时(质量分数),电池效率提高了一倍。Ti O2:Ho3+下转换纳米线拓宽光谱响应范围至近紫外光和中紫外光区,提高了电池的短路电流密度,从而电池效率提高。

关 键 词：Ho3＋-doped titanium dioxide nanowire downconversion fluorescence dye-sensitized solar cells photovoltaic performance 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]