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Improved Air Stability for High-Performance FACsPbI3 Perovskite Solar Cells via Bonding Engineering
Bo Yu1, Zhiwei Xu1, Hualin Liu1
1School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, China.
ACS Applied Materials & Interfaces
|January 3, 2024
Summary
This study introduces a sulfidation strategy using 1-pentanethiol (PT) to enhance perovskite solar cells (PSCs). The PT modification improves defect passivation, boosting PCE and significantly increasing operational stability against moisture and heat.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) offer high power conversion efficiency (PCE) but suffer from poor stability and defects.
- Perovskite crystals are vulnerable to moisture and environmental stress due to weak binding and ion-electron properties.
Purpose of the Study:
- To develop a sulfidation strategy to inhibit defects and enhance the stability of PSCs.
- To improve the performance and long-term durability of perovskite solar cells for commercial applications.
Main Methods:
- Introduction of 1-pentanethiol (PT) into the perovskite film for overall sulfidation.
- Passivation of uncoordinated Pb ions and iodine vacancy defects via strong Pb-S bonds.
- Fabrication and characterization of PT-modified inverted PSC devices.
Main Results:
- PT modification effectively passivates defects, reducing nonradiative recombination and optimizing energy levels.
- PT-modified PSCs achieved a champion PCE of 22.46%, outperforming the control device (20.21%).
- Enhanced stability was observed, with devices retaining 91.5% PCE after 1600 h in air and over 85% after 800 h at 85 °C.
Conclusions:
- The sulfidation strategy using PT offers a promising approach to simultaneously improve PCE and stability in PSCs.
- This method addresses key limitations of PSCs, paving the way for their commercial viability.
- Strong Pb-S bonds formed by PT effectively stabilize perovskite structure and enhance device performance.
