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Published on: March 19, 2017
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Tailored Crystallization Dynamics for Efficient and Stable DMSO-Free Tin Perovskite Solar Cells
Shengnan Zuo1, Alexander Tarasov2, Lennart Frohloff3
1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Department Active Materials and Interfaces for Stable Perovskite Solar Cells (SE-AMIP), Kekuléstraße 5, 12489, Berlin, Germany.
Summary
This study introduces a DMSO-free method for tin perovskite solar cells using piperazine dihydriodide (PDAI) and 4-tert-butylpyridine (tBP). This approach controls crystallization, yielding high-efficiency, stable lead-free solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Tin perovskite solar cells offer a sustainable, lead-free alternative in thin-film photovoltaics.
- Dimethyl sulfoxide (DMSO) use in processing is limited by its detrimental effects on tin oxidation.
- Developing DMSO-free processing is crucial but challenging due to rapid crystallization.
Purpose of the Study:
- To regulate crystallization in DMSO-free tin perovskite solar cells.
- To improve film quality and device performance using novel additives.
- To advance understanding of crystallization dynamics in non-DMSO solvent systems.
Main Methods:
- Utilized piperazine dihydriodide (PDAI) and 4-tert-butylpyridine (tBP) to tune perovskite ink colloidal chemistry.
- Managed the sol-gel to solid-film transition for controlled crystallization.
- Employed in situ photoluminescence (PL) to monitor crystallization rates during spin-coating.
Main Results:
- Achieved controlled crystallization rates in DMSO-free tin perovskite films.
- Demonstrated high film crystallinity and improved microstructure.
- Obtained a champion power conversion efficiency of 7.8% with excellent long-term stability (>3000 hours).
Conclusions:
- Co-addition of tBP and PDAI effectively manages crystallization in DMSO-free tin perovskite processing.
- This method leads to high-performance and stable lead-free perovskite solar cells.
- The findings provide a pathway for scalable and sustainable tin perovskite photovoltaics.
