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Updated: May 15, 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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Coordination Nanosheets Stabilizing Efficient Tin-Based Perovskite Solar Cells
Dhruba B Khadka1, Yan-Chen Kuo2, Yi Zhen Li2
1Photovoltaic Materials Group, Center for GREEN Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
ACS Applied Materials & Interfaces
|April 24, 2025
Summary
Terpyridine-zinc(II) coordination nanosheets enhance tin-based perovskite solar cells by improving crystal quality and reducing defects. This leads to higher power conversion efficiency and better stability for tin perovskite solar cells (Sn-PSCs).
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Tin-based perovskites offer a less toxic alternative to lead-based perovskites for solar cells.
- Key challenges for tin perovskite solar cells (Sn-PSCs) include efficiency limitations and instability due to Sn2+ oxidation.
- Defect chemistry and poor crystallization hinder the performance of Sn-PSCs.
Purpose of the Study:
- To enhance the optoelectronic performance and stability of tin-based perovskite solar cells (Sn-PSCs).
- To address the issue of Sn2+ oxidation and improve perovskite film quality.
- To investigate the role of terpyridine-zinc(II) coordination nanosheets (ZnTPY CONASHs) in Sn-PSC fabrication.
Main Methods:
- Synthesis of terpyridine-zinc(II) coordination nanosheets (ZnTPY CONASHs) via liquid-liquid interfacial polymerization.
- Incorporation of fragmented ZnTPY CONASHs into tin-based perovskite precursor solutions.
- Formation of ZnTPY:SnI2 heterogeneous nuclei to direct perovskite crystallization.
- Characterization of the modified perovskite films and device performance evaluation.
Main Results:
- ZnTPY CONASHs effectively chelate with SnI2, promoting heterogeneous nucleation and enhancing tin-based perovskite crystallization.
- The incorporation of ZnTPY CONASHs mitigates Sn2+ oxidation-related defects and reduces charge recombination.
- Modified Sn-PSCs exhibit improved photoluminescence lifetime, indicating superior crystal quality.
- The optimized Sn-PSC achieves a power conversion efficiency (PCE) of 11.59%, a significant increase from the control device's 9.14%.
- Enhanced operational stability was observed for the encapsulated ZnTPY-modified Sn-PSCs.
Conclusions:
- Terpyridine-zinc(II) coordination nanosheets are effective in regulating precursor coordination for high-quality tin-based perovskite films.
- The use of ZnTPY CONASHs provides a viable pathway to overcome the limitations of Sn-PSCs.
- This approach offers potential for developing more efficient and stable perovskite solar cell technologies.
