Multi-functional 3D N-doped TiO2 microspheres used as scattering layers for dye-sensitized solar cells
Multi-functional 3D N-doped TiO2 microspheres used as scattering layers for dye-sensitized solar cells作者机构:School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 China
出 版 物:《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿(英文版))
年 卷 期:2017年第11卷第3期
页 面:395-404页
核心收录:
学科分类:081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)]
基 金:supported by the Key Project of the National Natural Science Foundation of China for International Academic Exchanges by National Key Technologies R&D Program
主 题:DSSCs N doping scattering layer electron lifetime
摘 要:Three-dimensional TiO2 microspheres doped with N were synthesized by a simple single-step solvothermal method and the sample treated for 15 h (hereafter called TMF) was then used as scattering layers in the photoanodes of dye-sensitized solar cells (DSSCs). The TMF was characterized using scanning electron micro- scopy, high resolution transmission electron microscopy, Brunauer-Emmett-Teller measurements, X-ray diffraction, and X-ray photoelectron spectroscopy. The TMF had a high surface area of 93.2 m2. g-~ which was beneficial for more dye-loading. Five photoanode films with different internal structures were fabricated by printing different numbers of TMF scattering layers on fluorine-doped tin oxide glass. UV-vis diffuse reflection spectra, incident photon-to-current efficiencies, photocurrent-voltage curves and electrochemical impedance spectroscopy were used to investigate the optical and electrochemical proper- ties of these photoanodes in DSSCs. The presence of nitrogen in the TMF changed the TMF microstructure, which led to a higher open circuit voltage and a longer electron lifetime. In addition, the presence of the nitrogen significantly improved the light utilization and photocur- rent. The highest photoelectric conversion efficiency achieved was 8.08%, which is much higher than that derived from typical P25 nanoparticles (6.52%).