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Pre-Embedded Potassium Acetate-Modified SnO2 Electron Transfer Layer for Efficient and Durable Perovskite Solar Cells
Lina Qin1, Mengfei Zhu1, Min Zhang1
1State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, Suzhou Key Laboratory of Green Intelligent Manufacturing of New Energy Materials and Devices, Tianchang New Materials and Energy Technology Research Center, Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
This study introduces potassium acetate (KAc) in tin oxide (SnO2) electron transport layers for perovskite solar cells (PSCs). This defect passivation strategy enhances device efficiency and long-term stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells (PSCs) show high potential but face efficiency and stability challenges.
- Lattice defects and interfacial recombination limit power conversion efficiency (PCE) and device lifespan.
- Electron transport layers (ETLs) play a crucial role in PSC performance.
Purpose of the Study:
- To improve the efficiency and stability of perovskite solar cells.
- To passivate defects at the perovskite/ETL interface.
- To develop a scalable method for enhancing PSC performance.
Main Methods:
- Incorporation of multifunctional potassium acetate (KAc) into SnO2 ETL.
- Utilizing thermal diffusion of K+ and CH3COO- ions during annealing for defect passivation.
- Characterization of KAc-SnO2 ETL for uniformity, defect density, and conductivity.
Main Results:
- KAc-SnO2 ETL exhibited enhanced uniformity, reduced defect density, and improved conductivity.
- Optimized PSC achieved a PCE of 21.76%, a 14% relative increase from the control device (19.16%).
- The device retained 88.9% of its initial PCE after 1000 hours of operation.
Conclusions:
- Multifunctional KAc incorporation effectively passivates defects in SnO2 ETLs for PSCs.
- The enhanced ETL promotes better interfacial charge transfer, boosting device efficiency and stability.
- This approach offers a promising route for the scalable manufacturing of high-performance perovskite solar cells.
