Preparation of ZnO Nanocrystallite Aggregates for Photoanodes of Dye-Sensitized Solar Cells

• Main Authors: Yen-Wei Lu, 陸彥瑋
• Other Authors: Wan-Chin Yu
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/6qzbhz

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 104 === In this study, a green aqueous solution method was developed to synthesize a family of ZnO nanocrystallite aggregates, whose morphology was determined by the amount of L-histidine introduced into the reaction mixture. The resulting ZnO nanocrystallite aggregates were used to construct single-layered photoanodes for dye-sensitized solar cells (DSSCs) to investigate the effects of aggregate morphology on the photovoltaic performance of DSSCs. The best performing cells were those constructed from spherical nanocrystallite aggregates approximately 400 nm in diameter, obtained by adding 6.45 mM of histidine into the reaction mixture. The highest power conversion efficiency achieved was 4.52%, a 32% improvement over the efficiency attained by devices constructed from commercial ZnO nanoparticles. To enhance the cell efficiency even further, double-layered photoanodes were fabricated using the 400 nm spherical aggregates as a scattering layer and the commercial ZnO nanoparticles as the underlayer. DSSCs based the double-layered photoanodes achieved a power conversion efficiency of 4.93%.