Preparation And Performance Research Of ZnO Three-Dimensional Conductive Substrate

The success utilization of solar energy requires key technology breakthrough in the structure and material of photoelectric conversion device. Generally, the cost, electron transport and collecting efficiency, electron lifetime, transmittance, power conversion efficiency are restricted by the material and structre design of Dye-sensitized solar cells(DSCs). In this thesis, we have combined the newest development with photoanode material of DSCs. Preparation method and structre design of photoanode devices are researched in detail. The main content is as follows:1. Firstly we prepared low-density and large diamiter ZnO microrod arrays successfully. SEM images show ZnO microrod are grown perpendicular to substrate with a length of 10 um and a diameter of 1 um. The as-synthesized ZnO microrod arrays will lay a foundation for our follow reseachs.2. Low density ZnS microtube arrays with a large diameter of up to 1 um have been successfully prepared by using ZnO microrod arrays as a sacrificial template. The as-prepared micorostructrure show higher transmittance with a high structure stability and void filling capacity, which will have unique applications in the hybrid film photoelectrode of DSCs.3. We report in this paper a prototype of three-dimensional transparent current collector(3D-TCC) with enhanced charge collection. The 3D-TCC serves here not only as transport paths but also as trapping sites to prevent electrons recombining with the electrolyte. 3D-TCC exhibits better conductive properties and competitive transmission compared with conventional FTO glass. Furthermore, the 3D-TCC can suppress the damage caused by the screen printing. Power conversion efficiency of DSCs employing 3D-TCC as a current collector is higher by 17% than conventional DSCs using 2D FTO glass.4. We report in this paper a cheap and easy method for the preparation of ZnO nanowire/TiO2 nanoparticle hybrid films in DSCs, which is achieved by post-embedding ZnO nanowires in mesoporous TiO2 film. The hybrid films maintain both the direct conduction pathway for fast electron transfer provided by ZnO nanowires and the large surface area for sufficient dye molecules absorption offered from mesoporous TiO2 nanoparticles. The ZnO nanowire/TiO2 nanoparticle hybrid film based DSCs exhibit a remarkably enhanced power conversion efficiency of 7.46%, higher by 22% than standard TiO2 nanoparticle based DSCs.