Enhancing the Performance of Perovskite Solar Cells Using a Bilayer Electron Transport Layer Incorporating SWCNT

In this paper, a novel perovskite solar cell structure incorporating a single-walled carbon nanotube (SWCNT) layer as a secondary electron transport layer (ETL) between the primary ETL and the top electrode is proposed and simulated. The electrical and optical effects of this additional layer on the perovskite solar cell performance were investigated. Furthermore, the influence of nanotube chirality and the optimization of the SWCNT layer thickness were analyzed to enhance solar cell efficiency. Simulation results show that the incorporation of the SWCNT layer increases the conduction band slope in the perovskite layer, facilitating more efficient electron extraction and reducing recombination in this layer. Optically, the added layer reduces surface reflection and enhances light absorption within the perovskite layer thereby the short circuit current density (Jsc) is increased. As a result, the power conversion efficiency (PCE) of the proposed structure increased by 0.99% compared with the conventional perovskite solar cell, reaching 20.39%.