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Updated: Jul 11, 2025
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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Bimolecularly passivated interface enables efficient and stable inverted perovskite solar cells
Cheng Liu1, Yi Yang1, Hao Chen1,2
1Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Science (New York, N.Y.)
|November 16, 2023
Summary
Inverted perovskite solar cells (PSCs) achieve higher stability. Novel passivation strategies reduce recombination losses, boosting power conversion efficiency (PCE) to 25.1% and enabling stable operation.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inverted (p-i-n) perovskite solar cells (PSCs) offer improved operational stability over traditional (n-i-p) structures.
- However, PSCs often suffer from lower power conversion efficiencies (PCEs) due to nonradiative recombination, particularly at the perovskite/C60 interface.
Purpose of the Study:
- To enhance the PCE and operational stability of inverted PSCs.
- To mitigate nonradiative recombination losses at the perovskite/C60 interface.
Main Methods:
- Passivation of surface defects using sulfur-modified methylthio molecules for strong coordination and hydrogen bonding.
- Repelling minority carriers from the interface using diammonium molecules for field-effect passivation.
- Utilizing functional molecules to reduce contact-induced interface recombination.
Main Results:
- Achieved a fivefold increase in carrier lifetime.
- Reduced photoluminescence quantum yield loss by one-third.
- Certified quasi-steady-state PCE of 25.1% for inverted PSCs.
- Demonstrated stable operation at 65°C for over 2000 hours in ambient air.
- Fabricated monolithic all-perovskite tandem solar cells with 28.1% PCE.
Conclusions:
- The developed passivation strategy effectively suppresses recombination losses at the perovskite/C60 interface.
- This approach significantly enhances both the efficiency and stability of inverted PSCs.
- The findings pave the way for highly efficient and stable perovskite solar technologies, including tandem devices.
