Co-Self-Assembled Monolayers Modified NiOx for Stable Inverted Perovskite Solar Cells
Qi Cao1,2, Tianyue Wang1, Xingyu Pu2
1Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, 999077, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|January 10, 2024
Summary
This study introduces a novel Co-SAM strategy to enhance perovskite solar cells (PSCs). By doping [4-(3,6-dimethyl-9H-carbazol-9yl)butyl]phosphonic acid with phosphorylcholine chloride, defect passivation is improved, boosting PSC efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Buried interfaces in NiOx hinder inverted perovskite solar cell (PSC) performance.
- Existing self-assembled molecules (SAMs) like [4-(3,6-dimethyl-9H-carbazol-9yl)butyl]phosphonic acid (Me-4PACz) have limitations in defect passivation.
Purpose of the Study:
- To develop a Co-SAM strategy to improve the buried interface of NiOx in PSCs.
- To enhance defect passivation, device efficiency, and operational stability of PSCs.
Main Methods:
- Doping Me-4PACz with phosphorylcholine chloride (PC) to create a Co-SAM.
- Utilizing the phosphate group, chloride ions, and quaternary ammonium ions in PC for defect passivation at the NiOx surface and within the perovskite film.
- Investigating the impact of Co-SAM on perovskite crystal growth, carrier transport, and film stress.
Main Results:
- Co-SAM improved monolayer coverage and reduced leakage current.
- Effective passivation of NiOx surface defects and defects within the perovskite film.
- Enhanced perovskite crystal growth, suppressed nonradiative recombination, and accelerated carrier transmission.
- Achieved a power conversion efficiency of 25.09% and maintained 93% of initial efficiency after 1000 hours of operation.
Conclusions:
- The Co-SAM strategy effectively addresses buried interface issues in PSCs.
- Co-SAM significantly enhances both the power conversion efficiency and long-term operational stability of PSCs.
- This approach offers a promising route for developing high-performance and durable perovskite solar cells.
