Abstract
Abstract The interface between the electron transport layer (ETL) and the perovskite layer is essential for fabricating efficient and stable perovskite solar cells (PSCs). In this study, we introduced a bilayer ETL of W-doped ZnO and single crystalline anatase TiO2 nanoparticles (average diameter = 6-10 nm) to mitigate the degradation between W-doped ZnO ETL and MA-containing perovskite layer. After 12 hours of annealing at 85°C, the perovskite grown on the bilayer exhibited strong perovskite peaks, indicating a significant slowdown in decomposition. Moreover, the bilayer device demonstrated superior thermal stability, retaining over 60% of their initial PCE after 24 hours of annealing, while the W-doped ZnO single-layer device lost all efficiency. PSCs with the W-doped ZnO/Anatase TiO2 bilayer achieved power conversion efficiency (PCE) of 16.63%, compared to 11.88% for the W-doped ZnO single layer. This bilayer application offers a promising pathway for improving both efficiency and stability for perovskite-based optoelectronic devices.
Published Version
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