Double-layered TiO_(2) cavity/nanoparticle photoelectrodes for efficient dye-sensitized solar cells  

作　　者：Zhen Li Libo Yu 

机构地区：[1]College of Chemistry and Chemical Engineering,Hexi University,Zhangye 734000,China [2]Key Laboratory of Hexi Corridor Resources Utilization of Gansu,Hexi University,Zhangye 734000,China

出　　处：《Frontiers of Materials Science》2023年第1期153-161,共9页材料学前沿（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.51862007);the Western Youth Scholars Program of Chinese Academy of Sciences,and the Young Doctor Fund Project of Gansu Provincial Department of Education(Grant No.2022QB-156).

摘　　要：TiO_(2) nanoparticles(NPs)in the size of-25 nm,namely P25,are very common material as the electron collecting layer in dye-sensitized solar cells(DSsCs).However,the light-scattering improvement of TiO2 NP photoelectrodes is stll a challenge.Here,we built TiO2 cavities on the top of the TiO2 NP layer by using carbonaceous microspheres as the template,forming the TiO_(2) cavity/nanoparticle(C/NP)photoelectrode for the application in DSSCs.The cavity amount in the TiO_(2) C/NP photoelectrode was controlled by adjusting the weight ratio of carbonaceous microspheres.SEM results confirm the successful formation of the double-layered TiO_(2) C/NP electrode.J-V tests show that the optimized TiO_(2) C/NP electrode prepared with 25 wt.%carbonaceous microspheres contributes to remarkable improvement of the short-circuit current density(Jsc)and the power conversion efficiency(PcE).The best photovoltaic performance solar cell with the PCE of 9.08%is achieved with the optimized TiO_(2) C/NP photoelectrode,which is over 98% higher than that of the TiO_(2) NP photoelectrode.Further investigations of UV-vis DRS,IPCE,OCVD,and EIS demonstrate that the competition between light scattering effect and charges recombination in this TiO_(2) C/NP photoelectrode is responsiblefor the PCE enhancement.

关 键 词：titanium dioxide dye sensitized solar cell CAVITY light scattering 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB3[一般工业技术—材料科学与工程]