Functionalized Polymer-Capped SnO2 Nanoparticle Electron Transport Layer for Efficient Perovskite Solar Cells

Abstract

For the last decade, perovskite solar cells have been in rapid growth, highlighted as a representative next-generation solar cell. Although SnO2 is suitable as the electron-transporting material of perovskite solar cells, there also have been some obstacles in the formation of uniform and thin layers of SnO2 on the uneven FTO substrate. In this work, we investigated polymer-assisted fabrication methods to achieve conformal coating of SnO2 nanoparticles on rough FTO substrate, finally leading to improved performance of perovskite solar cells due to enhanced coverage and optimized electron-transporting property. As a result, we fabricated an efficient perovskite solar cells with a power conversion efficiency of 24% by employing polymer-capped SnO2 nanoparticles as electron-transporting layer.