Room Temperature Processed Double Electron Transport Layers for Efficient Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Zinc Oxide (ZnO) is a promising electron transport layer (ETL) for perovskite solar cells (PSCs) due to its high electron mobility.
• However, ZnO's acid instability degrades methylammonium lead triiodide (MAPbI3) perovskite, reducing power conversion efficiency (PCE).

Purpose of the Study:

• To develop a stable and efficient electron transport layer for perovskite solar cells.
• To investigate the use of Nb2O5/ZnO as a double electron transport layer (DETL) to overcome ZnO's limitations.

Main Methods:

• Nb2O5/ZnO films were deposited at room temperature using RF magnetron sputtering.
• The films were integrated as DETLs in methylammonium lead triiodide (MAPbI3) perovskite solar cells.
• Systematic investigation of ZnO deposition time was performed to optimize performance.

Main Results:

• The Nb2O5/ZnO DETL exhibited excellent energy band matching with MAPbI3 and ZnO.
• The Nb2O5 insertion improved the stability of the perovskite film.
• A ZnO deposition time of five minutes yielded the highest PCE of 13.8%.

Conclusions:

• The Nb2O5/ZnO DETL is a viable solution for enhancing PSC performance and stability.
• Optimized deposition parameters are crucial for achieving high PCE in perovskite solar cells.
• The study highlights the potential of Nb2O5/ZnO DETLs for efficient perovskite solar cell applications.