| 초록 |
Perovskite solar cells (PSCs) have become one of the most interesting topics recently for alternative energy source due to their excellent efficiency. In this study, we assembled PSCs using a hollow structure as a scaffold layer and Al doped TiO2 (Al-TiO2) as a compact layer. The hollow structure in scaffold layer enabled effective loading of perovskite (CH3NH3PbI3Cl3-x) on the working electrode of the PSC. Particularly, SiO2/TiO2 hollow nanoparticles (STHNPs) as insulators improved the open circuit voltage, because photogenerated electrons cannot readily transfer into the conduction band of STHNPs. Furthermore, the Al-TiO2 compact layer with low temperature procedure (≤150 °C) promoted electron extraction and reduced the recombination, leading to enhanced power conversion efficiency (PCE). An optimum PCE of 14.7% was achieved for PSCs based on STHNP scaffold layer with Al doping in the compact layer. |
