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Synergistic Surface Defect Passivation of Ionic Liquids for Efficient and Stable MAPbI3-Based Inverted Perovskite
Shaocong Duan1, Qing Sun1, Gang Liu1
1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
ACS Applied Materials & Interfaces
|September 25, 2023
Summary
This study introduces dithiocarbamate diethylamine (DADA) to passivate defects in perovskite solar cells. This surface treatment enhances power conversion efficiency and significantly improves device stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Organic-inorganic hybrid perovskite solar cells utilize polycrystalline thin films with inherent point and surface defects.
- Surface defects critically impact perovskite solar cell performance, necessitating defect reduction strategies.
Purpose of the Study:
- To prepare high-quality perovskite thin films using an ionic liquid for interface passivation.
- To investigate the passivation mechanism and its effect on defect reduction and device performance.
Main Methods:
- Utilized dithiocarbamate diethylamine (DADA), an ionic liquid, for perovskite thin film passivation.
- Analyzed the chelation of sulfur with lead ions and hydrogen bonding with iodine ions by DADA.
- Evaluated the impact of DADA treatment on film morphology, defect density, carrier lifetime, and work function.
Main Results:
- DADA passivation synergistically improved perovskite film morphology, reducing charged surface defects and extending carrier lifetime.
- The DADA treatment increased the perovskite film's work function, aiding carrier transport.
- Achieved a power conversion efficiency (PCE) increase from 19.13% to 21.36% with a fill factor of 83.17%.
Conclusions:
- DADA effectively passivates perovskite surface defects, enhancing device performance and stability.
- The hydrophobic nature of DADA and ion defect passivation significantly improved device longevity.
- The treated perovskite solar cells maintained over 80% of their initial PCE after 500 hours of storage in ambient air.
