Synthesis of dispersed long single-crystalline TiO_2 paste and its application in DSSC as a scattering layer  

作　　者：Longwei Li Nai Wen Huarong Xia Jia Li Wentao Sun Lianmao Peng 

机构地区：[1]Key Laboratory for the Physics and Chemistry of Nanodevices of Ministry of Education [2]Peking University [3]Department of Electronics, Peking University [4]College of Electric and Information Engineering, Pingdingshan University [5]Academy for Advanced Interdisciplinary Studies, Peking University

出　　处：《Science China Chemistry》2015年第9期1501-1507,共7页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2011CB933002,2012CB932702);the National Natural Science Foundation of China(61306079,60871002)

摘　　要：Ti O2 nanowire(NW) is one of the potential scattering layer materials in dye-sensitized solar cells(DSSCs) owing to its fast electron conductivity and excellent light scattering property resulting from its one-dimensional(1D) morphology. However, Ti O2 NWs used as scattering layers in previous work were either aggregated or shortened into shuttles that cannot use their unique 1D properties. In this paper, we present the preparation of a well-dispersed long NW paste(exceeding 1 ?m) by a mild method and used as a scattering layer in DSSC. The paste achieved a photoconversion efficiency of 5.73% and an efficiency enhancement of 12% compared with commercial scattering layer(P200 paste). Compared with the DSSC without a scattering layer, an efficiency enhancement of 54.9% was achieved. Also, the largest efficiency of 6.89% was obtained after optimization of photoanode thickness. The photoanodes were investigated through dye desorbed experiments and transmission spectra, which suggested that P25 nanoparticles with the as-prepared NW scattering layer loaded more dye than those with P200 paste. These results indicate that well-dispersed long NW paste has a potential application in scattering layers.TiO2 nanowire（NW） is one of the potential scattering layer materials in dye-sensitized solar cells（DSSCs） owing to its fast electron conductivity and excellent light scattering property resulting from its one-dimensional（1D） morphology. However, Ti O2 NWs used as scattering layers in previous work were either aggregated or shortened into shuttles that cannot use their unique 1D properties. In this paper, we present the preparation of a well-dispersed long NW paste（exceeding 1μm） by a mild method and used as a scattering layer in DSSC. The paste achieved a photoconversion efficiency of 5.73% and an efficiency enhancement of 12% compared with commercial scattering layer（P200 paste）. Compared with the DSSC without a scattering layer, an efficiency enhancement of 54.9% was achieved. Also, the largest efficiency of 6.89% was obtained after optimization of photoanode thickness. The photoanodes were investigated through dye desorbed experiments and transmission spectra, which suggested that P25 nanoparticles with the as-prepared NW scattering layer loaded more dye than those with P200 paste. These results indicate that well-dispersed long NW paste has a potential application in scattering layers.

关 键 词：well-dispersed paste TiO2 nanowire DSSCS scattering layer 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ134.11[化学工程—无机化工]