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Tuning Self-Assembly of Hole-Selective Monolayers for Reproducible Perovskite/Silicon Tandem Solar Cells
Oussama Er-Raji1,2, Stefan Lange3, Carl Eric Hartwig3
1Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110, Freiburg, Germany.
Small Methods
|February 25, 2025
Summary
Optimizing annealing temperature for self-assembled monolayers (SAMs) in perovskite solar cells creates a dense monolayer, boosting power conversion efficiency by 1.3% absolute in tandem devices.
Area of Science:
- Materials Science
- Renewable Energy
- Surface Chemistry
Background:
- Self-assembled monolayers (SAMs) are crucial for high-efficiency perovskite solar cells, acting as hole-selective contacts.
- Challenges exist in achieving monolayer thickness and high packing density of SAMs on metal oxide substrates.
Purpose of the Study:
- Investigate the impact of annealing temperature on SAM formation for perovskite solar cells.
- Optimize SAM deposition for improved interfacial properties and device performance.
Main Methods:
- In situ angle-resolved X-ray photoelectron spectroscopy (XPS) was used to analyze SAM formation.
- Advanced data analysis routines were employed to study SAM structure and density.
- Perovskite/silicon tandem solar cells were fabricated and characterized.
Main Results:
- Increasing annealing temperature from 100°C to 150°C reduced SAM thickness from ≈5 nm to a monolayer.
- Higher temperatures promoted denser SAM adsorption on metal oxide surfaces.
- Improved interfacial passivation led to a 1.3% absolute PCE increase in tandem solar cells.
Conclusions:
- Annealing temperature is a critical, unexplored parameter for SAM formation.
- Optimized SAM formation enhances passivation and device efficiency.
- This strategy offers a pathway to further advance perovskite solar cell technology.
