Efficiency improvement of flexible dye-sensitized solar cells by introducing mesoporous TiO_2 microsphere  

作　　者：FAN LeQing CHEN Yuan WU JiHuai LI ZhaoLei XIAO YaoMing HUANG MiaoLiang YU HaiJun 

机构地区：[1]Engineering Research Center of Environment-Friendly Functional Materials,Ministry of Education [2]Key Laboratory of Functional Materials for Fujian Higher Education [3]Institute of Materials Physical Chemistry, Huaqiao University

出　　处：《Science China Chemistry》2013年第10期1470-1477,共8页中国科学（化学英文版）

基　　金：supported financially by the National High Technology Research and Development Program of China(2009AA03Z217);the National Natural Science Foundation of China(90922028);the Key Project of Chinese Ministry of Education(211204);the Fund of Fujian Provincial Key Laboratory of Nanomaterials(NM10-5)

摘　　要：Mesoporous TiO2microsphere(MTM)was synthesized via a simple solution route and then mixed with commercial TiO2(P25)to form highly homogeneous and stable TiO2colloid by simple hydrothermal treatment.The TiO2colloid was coated onto the plastic conductive substrate to prepare mesoporous TiO2film for flexible dye-sensitized solar cells(DSSCs)by low-temperature heat treatment.The influence of MTM content on the physicochemical properties of the flexible TiO2film was characterized by scanning electron microscope,transmission electron microscopy,X-ray diffraction,energy-dispersive X-ray spectrometer,N2adsorption-desorption isotherms,UV–vis absorption and diffuse reflectance spectra.It is revealed that with increasing the MTM content,the dye-loading capability of TiO2film and light-harvesting efficiency of flexible DSSCs are improved due to MTM having high surface area and acting as a light scattering center,respectively,resulting in the enhancement of photocurrent of flexible DSSCs.However,more and larger cracks having negative effect on the performances of flexible DSSCs are formed simultaneously.Under the optimal condition with MTM content of 20%,a flexible DSSC with overall light-to-electric energy conversion efficiency of 2.74%is achieved under a simulated solar light irradiation of 100 mW cm 2(AM 1.5),with 26%improvement in comparison with DSSCs based on P25 alone.Mesoporous TiO2 microsphere （MTM） was synthesized via a simple solution route and then mixed with commercial TiO2 （P25） to form highly homogeneous and stable TiO2 colloid by simple hydrothermal treatment. The TiO2 colloid was coated onto the plastic conductive substrate to prepare mesoporous TiO2 film for flexible dye-sensitized solar cells （DSSCs） by low-temperature heat treatment. The influence of MTM content on the physicochemical properties of the flexible TiO2 film was characterized by scanning electron microscope, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometer, N2 adsorption-desorption isotherms, UV-vis absorption and diffuse reflectance spectra. It is revealed that with increasing the MTM content, the dye-loading capability of TiO2 film and light-harvesting efficiency of flexible DSSCs are improved due to MTM having high surface area and acting as a light scattering center, respectively, resulting in the en- hancement of photocurrent of flexible DSSCs. However, more and larger cracks having negative effect on the performances of flexible DSSCs are formed simultaneously. Under the optimal condition with MTM content of 20%, a flexible DSSC with overall light-to-electric energy conversion efficiency of 2.74% is achieved under a simulated solar light irradiation of 100 mW cm-2 （AM 1.5）, with 26% improvement in comparison with DSSCs based on P25 alone.

关 键 词：mesoporous TiO2 microsphere dye-sensitized solar cell flexible mesoporous TiO2 film hydrothermal treatment 

分 类 号：TM914.4[电气工程—电力电子与电力传动]