The Study of Pervoskite Solar Cells via Zinc Oxide Nanowires Scaffold

• Main Authors: SIAO-YU SYU, 許筱愉
• Other Authors: Liang-Yih Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/01287922189348175085

碩士 === 國立臺灣科技大學 === 化學工程系 === 104 === Organic-inorganic halide perovskite (OIH-P) has been attracted by many researchers in the world due to its high absorption coefficient (~1.54x104 cm-1), tunable energy bandgap and simple preparation process for solar devices. Until now, the power conversion efficiency (PCE) has achieved 22.1%. In general, titanium dioxide (TiO2) nanoparticles were used as scaffold in OIH-P solar cell for electron transport medium. Because electron diffusion coefficient inside TiO2 nanoparticles is low, we used zinc oxide nanowires as scaffold in this study due to its good electron transport properties. For preparing OIH-P light-harvesting layer, a two-step sequential process was employed in this work. From previous studies, there are several papers reported that OIH-P layer would easily destroy when it was coated on the surface of zinc oxide. Therefore, we added polyethylenimine (PEI) in the growth solution to prepare zinc oxide nanowires and to evaluate the stability of OIH-P layer. In addition, we also search the optimal conditions for preparation of OIH-P solar cells. The surface morphologies, optical properties and structures were analyzed by scanning electron microscopy (SEM), UV-visible spectroscopy and X-ray diffraction pattern, respectively. The best performances of OIH-P solar cell in this work by using zinc oxide nanowires as scaffold are short-circuit current density (Jsc) of 22.46 mA/cm2, open-circuit voltage (Voc) of 0.95 V, fill factor (FF) of 0.62 and PCE of 13.45%.