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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.08579 |
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| _version_ | 1866918411867521024 |
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| author | Stacchini, Valerio Rastgoo, Madineh Marčinskas, Mantas Frasca, Chiara Morita, Kazuki Frohloff, Lennart Treglia, Antonella Karalis, Orestis Getautis, Vytautas Petrozza, Annamaria Koch, Norbert Hempel, Hannes Malinauskas, Tadas Abate, Antonio Musiienko, Artem |
| author_facet | Stacchini, Valerio Rastgoo, Madineh Marčinskas, Mantas Frasca, Chiara Morita, Kazuki Frohloff, Lennart Treglia, Antonella Karalis, Orestis Getautis, Vytautas Petrozza, Annamaria Koch, Norbert Hempel, Hannes Malinauskas, Tadas Abate, Antonio Musiienko, Artem |
| contents | Self-assembled monolayers (SAMs) have revolutionized the fabrication of lead-based perovskite solar cells, but they remain underexplored in tin perovskite systems. PEDOT is the material of choice for hole-selective layers in tin perovskite solar cells (TPSCs), but presents challenges for both performance and stability. MeO-2PACz, the only SAM reported for Sn perovskites, enables device fabrication but consistently underperforms when compared to PEDOT. In this work, we identify that MeO-2PACz's limitations arise from excessively strong interactions with perovskite surface and poor lattice matching, leading to poor interface quality. To overcome these issues, we design, synthesize, and characterize a novel SAM-forming molecule called Th-2EPT. Th-2EPT optimizes coordination strength and improves lattice compatibility, contributing to the creation of a high-quality buried interface and dramatically suppressing non-radiative recombination. We used Density Functional Theory (DFT) to evaluate coordination strength and lattice compatibility, complemented by nanosecond-resolution optical characterization techniques to confirm significantly reduced interfacial recombination and enhanced carrier lifetimes in Th-2EPT-Perovskite films. With Th-2EPT, we demonstrated the first SAM-based tin perovskite solar cells to outperform PEDOT-based devices, delivering a record power conversion efficiency (PCE) of 8.2% with a DMSO-free solvent system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08579 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phenothiazine-Based Self-Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells Stacchini, Valerio Rastgoo, Madineh Marčinskas, Mantas Frasca, Chiara Morita, Kazuki Frohloff, Lennart Treglia, Antonella Karalis, Orestis Getautis, Vytautas Petrozza, Annamaria Koch, Norbert Hempel, Hannes Malinauskas, Tadas Abate, Antonio Musiienko, Artem Materials Science Self-assembled monolayers (SAMs) have revolutionized the fabrication of lead-based perovskite solar cells, but they remain underexplored in tin perovskite systems. PEDOT is the material of choice for hole-selective layers in tin perovskite solar cells (TPSCs), but presents challenges for both performance and stability. MeO-2PACz, the only SAM reported for Sn perovskites, enables device fabrication but consistently underperforms when compared to PEDOT. In this work, we identify that MeO-2PACz's limitations arise from excessively strong interactions with perovskite surface and poor lattice matching, leading to poor interface quality. To overcome these issues, we design, synthesize, and characterize a novel SAM-forming molecule called Th-2EPT. Th-2EPT optimizes coordination strength and improves lattice compatibility, contributing to the creation of a high-quality buried interface and dramatically suppressing non-radiative recombination. We used Density Functional Theory (DFT) to evaluate coordination strength and lattice compatibility, complemented by nanosecond-resolution optical characterization techniques to confirm significantly reduced interfacial recombination and enhanced carrier lifetimes in Th-2EPT-Perovskite films. With Th-2EPT, we demonstrated the first SAM-based tin perovskite solar cells to outperform PEDOT-based devices, delivering a record power conversion efficiency (PCE) of 8.2% with a DMSO-free solvent system. |
| title | Phenothiazine-Based Self-Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.08579 |