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Enhancing Flexibility, Long-Term Stability, and Efficiency in Full Air Fabricated Perovskite Solar Cells via
Ruizhi Duan1, Leying Zha1, Lixin Song1
1College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 3, 2024
Summary
Fluorinated polyurethane (FPU) additive enhances perovskite solar cells (PSCs) by passivating defects, boosting power conversion efficiency to 21.18%. FPU also improves stability against moisture and bending, maintaining 82% efficiency after 2000 hours.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite films are prone to defects like uncoordinated ions and lattice distortions, hindering photovoltaic efficiency and stability.
- These defects arise from factors such as solvent volatilization anisotropy and thermal expansion coefficient mismatches.
- Defects significantly compromise both the power conversion efficiency and long-term durability of perovskite solar cells (PSCs).
Purpose of the Study:
- To synthesize fluorinated polyurethane (FPU) as a multifunctional additive for perovskite precursor.
- To investigate the passivation mechanisms of FPU on perovskite surface and grain boundary defects.
- To evaluate the impact of FPU on the photovoltaic performance and stability of PSCs.
Main Methods:
- Fluorinated polyurethane (FPU) was synthesized and incorporated into the perovskite precursor solution.
- The interaction between FPU and perovskite components (Pb2+, MA+, I-) was analyzed, including hydrogen bonding and coordination.
- Power conversion efficiency (PCE) and stability tests (moisture, bending) were conducted on FPU-modified PSCs.
Main Results:
- FPU additive effectively passivates surface and grain boundary defects by interacting with Pb2+ ions and forming hydrogen bonds.
- FPU treatment leads to increased grain size, reduced defect density, and enhanced charge transport in perovskite films.
- FPU-modified PSCs achieved PCEs of 21.18% (rigid) and 17.76% (flexible), with excellent stability (82% after 2000h, 92.4% after 300 bending cycles).
Conclusions:
- FPU serves as an effective multifunctional additive for improving perovskite solar cell performance and stability.
- The FPU additive mitigates nonradiative recombination and enhances charge transport through defect passivation and grain structure improvement.
- The developed FPU-based PSCs demonstrate promising potential for durable and efficient solar energy conversion, even on flexible substrates.
