Application of Metal Oxides in Highly Efficient, Hysteresis-Free, and Air-Stable Perovskite Solar Cells

• Main Authors: Cheng-Hung Hou, 侯政宏
• Other Authors: 蔡豐羽
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/ha6fxa

博士 === 國立臺灣大學 === 材料科學與工程學研究所 === 106 === The rapidly grown demand on energy supply, driven by the advancing technology and increasing degree of industrialization, has encouraged researchers to search for a sustainable and clean energy source. Perovskite solar cell, among all the highly efficient solar cell technologies, holds particular promise due to its compatibility with the low-cost, solution-based fabrication procedures. In this study, we found that the optimal sintering temperatures of sol-gel TiO2 and NiO film, functioning as electron- and hole-transporting layer in the perovskite solar cell, could be decreased to 280 ˚C and 180 ˚C, respectively, via metal-induced-crystallization (MIC) triggered by Au nanoparticle. We verified the MIC mechanism through element depth profile and simultaneous thermogravimetric (TGA) /differential scanning calorimeter (DSC) analysis. During the MIC process, the metal not only decreases the crystallization temperature, but also promotes the organic ligand removal and condensation reaction of the sol-gel precursor, enabling the fabrication of highly pure and crystallized metal oxide film via low-temperature process. We also demonstrated that efficient electron-transporting layers could be deposited by spin-coating hydrothermal synthesized SnOx nanoparticle suspensions without any sintering treatment. After testing SnOx nanoparticle with a series doping concentrations of vanadium (V) and antimony (Sb), we found that the optimal device performance was achieved when utilizing 5 % V-doped SnOx nanoparticle. More importantly, we developed a multistep hydrothermal synthesis procedure in which nonpolar 1-butanol was used to suspend the SnOx nanoparticle, greatly enhancing the compatibility of nanoparticle suspension with the perovskite layer. By utilizing MIC and multistep hydrothermal synthesis procedure, we demonstrated highly efficient perovskite solar cell with all-metal-oxide carrier-transporting layer with excellent thermal stability.