Negi Sanjay Singh
Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.
ACS Omega. 2018 Feb 8;3(2):1645-1652. doi: 10.1021/acsomega.7b01812. eCollection 2018 Feb 28.
The performance of a dye-sensitized solar cell (DSSC) is strongly affected by optical, structural, and electronic features of a photoanode. In this article, meso-TiO was prepared by a solution combustion method and hydrogenation at high pressure. The properties of DSSCs with meso-TiO photoanodes were investigated by photocurrent-voltage, incident photon-to-current conversion efficiency, and electrochemical impedance spectroscopy (EIS) measurements. The meso-TiO materials exhibit new electronic states and aided to absorb in the visible region because of the narrow band gap. Facile charge transfer from the N719 dye to the TiO photoanode was assisted by low-lying mid-gap states. Electrically integrated nanoparticles, with a small-channel mesoporous framework, facilitates fast charge transport across the material. Furthermore, EIS has shown that chemical capacitance, recombination resistance, and electron lifetime were affected by hydrogenation, thus indicating an effect on the photoanode material charge dynamics of DSSCs. An η of 7.2% under AM 1.5G illumination is obtained and an improvement by 75.6% over Degussa P25 titania. This is attributed to improved light harvesting and charge collection by the meso-TiO photoanode obtained via simple combustion synthesis.
染料敏化太阳能电池（DSSC）的性能受到光阳极的光学、结构和电子特性的强烈影响。在本文中，通过溶液燃烧法和高压氢化制备了介观TiO。通过光电流-电压、入射光子到电流转换效率和电化学阻抗谱（EIS）测量研究了具有介观TiO光阳极的DSSC的性能。介观TiO材料由于带隙窄而呈现出新的电子态，并有助于在可见光区域吸收。低能隙中间态有助于N719染料向TiO光阳极的电荷转移。具有小通道介孔框架的电集成纳米颗粒促进了电荷在材料中的快速传输。此外，EIS表明化学电容、复合电阻和电子寿命受氢化影响，从而表明对DSSC的光阳极材料电荷动力学有影响。在AM 1.5G光照下获得了7.2%的η，比Degussa P25二氧化钛提高了75.6%。这归因于通过简单燃烧合成获得的介观TiO光阳极改善了光捕获和电荷收集。
