Enhancement of Electron Transport Properties for Highly Efficient Inverted Organic Solar Cells
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초록
내용
Zinc oxide (ZnO) derived by the sol-gel method is widely studied as electron transport layers (ETLs) for inverted organic solar cells (OSCs) owing to its high transparency, proper energy level, and good stability. However, solution-processed ZnO has poor crystallinity and many defects inside, which leads to low electron mobility and limits the power conversion efficiency (PCE). In this work, we applied aluminum-doped ZnO (AZO) and a suitable annealing process to passivate defect sites and optimize the surface morphology. By using AZO as ETL in inverted OSCs with the PM6:DTY6 system, the maximum PCE is up to 16.8%, which is a result of the high current density compared with the ZnO. These properties also improved ETL thickness tolerance. In conclusion, AZO could be a promising ETL for efficient OSCs, which paves the avenue for the following commercialization process.