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Oriented Crystal Growth during Perovskite Surface Reconstruction
Hyeon-Seo Choi1, Yu-Na Kim1, Seungyeon Hong2
1Department of Chemistry, Inha University, Incheon22212, Korea.
ACS Applied Materials & Interfaces
|November 1, 2022
Summary
The length of fluorinated alkyl chains in perovskite solar cells (PSCs) influences crystal growth dynamics and surface tension. This control enhances crystal orientation, reducing defects and improving solar cell performance.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Surface passivation is crucial for enhancing power conversion efficiency (PCE) in perovskite solar cells (PSCs).
- Recent advancements utilize mixed salts for passivation, showing tunable performance based on alkyl chain length.
- Understanding the alkyl chain's role in crystal growth is vital for interface control.
Purpose of the Study:
- To investigate how fluorine-substituted alkyl chain length affects crystal formation dynamics in PSCs.
- To elucidate the mechanism by which alkyl chains manipulate surface tensions and crystal growth.
- To correlate crystal orientation with charge recombination and device performance.
Main Methods:
- Synthesis of passivation agents with varying fluorinated alkyl chain lengths.
- Fabrication of perovskite solar cells using these agents.
- Characterization of perovskite film morphology, crystal orientation, and surface properties.
- Performance testing of fabricated solar cells, including open-circuit voltage and fill factor measurements.
Main Results:
- Alkyl chain length was found to govern crystal formation dynamics by altering surface tensions of different crystal facets.
- Surface recrystallization enhanced the favored (001) plane, with a specific chain length promoting highly oriented (001) over (111) growth.
- Improved crystal orientation led to reduced trap density and suppressed interfacial charge recombination.
Conclusions:
- The study demonstrates that fluorinated alkyl chain length is a key parameter for controlling perovskite crystal growth and passivation.
- Optimized crystal orientation via surface recrystallization significantly enhances PSC performance by minimizing charge recombination.
- This work provides fundamental insights for advanced interface engineering in high-efficiency perovskite solar cells.
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