Towards low-temperature processing of efficient $γ$-CsPbI$_3$ perovskite solar cells
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913320807694336 |
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| author | Zhang, Zongbao Ji, Ran Hofstetter, Yvonne J. Deconinck, Marielle Brunner, Julius Li, Yanxiu An, Qingzhi Vaynzof, Yana |
| author_facet | Zhang, Zongbao Ji, Ran Hofstetter, Yvonne J. Deconinck, Marielle Brunner, Julius Li, Yanxiu An, Qingzhi Vaynzof, Yana |
| contents | Inorganic cesium lead iodide (CsPbI$_3$) perovskite solar cells (PSCs) have attracted enormous attention due to their excellent thermal stability and optical bandgap (~1.73 eV), well-suited for tandem device applications. However, achieving high-performing photovoltaic devices processed at low temperatures is still challenging. Here we reported a new method to fabricate high-efficiency and stable $γ$-CsPbI$_3$ PSCs at lower temperatures than was previously possible by introducing the long-chain organic cation salt ethane-1,2-diammonium iodide (EDAI2) and regulating the content of lead acetate (Pb(OAc)2) in the perovskite precursor solution. We find that EDAI2 acts as an intermediate that can promote the formation of $γ$-CsPbI$_3$, while excess Pb(OAc)2 can further stabilize the $γ$-phase of CsPbI$_3$ perovskite. Consequently, improved crystallinity and morphology and reduced carrier recombination are observed in the CsPbI$_3$ films fabricated by the new method. By optimizing the hole transport layer of CsPbI$_3$ inverted architecture solar cells, we demonstrate up to 16.6% efficiencies, surpassing previous reports examining $γ$-CsPbI$_3$ in inverted PSCs. Notably, the encapsulated solar cells maintain 97% of their initial efficiency at room temperature and dim light for 25 days, demonstrating the synergistic effect of EDAI2 and Pb(OAc)2 on stabilizing $γ$-CsPbI$_3$ PSCs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_11636 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Towards low-temperature processing of efficient $γ$-CsPbI$_3$ perovskite solar cells Zhang, Zongbao Ji, Ran Hofstetter, Yvonne J. Deconinck, Marielle Brunner, Julius Li, Yanxiu An, Qingzhi Vaynzof, Yana Materials Science Inorganic cesium lead iodide (CsPbI$_3$) perovskite solar cells (PSCs) have attracted enormous attention due to their excellent thermal stability and optical bandgap (~1.73 eV), well-suited for tandem device applications. However, achieving high-performing photovoltaic devices processed at low temperatures is still challenging. Here we reported a new method to fabricate high-efficiency and stable $γ$-CsPbI$_3$ PSCs at lower temperatures than was previously possible by introducing the long-chain organic cation salt ethane-1,2-diammonium iodide (EDAI2) and regulating the content of lead acetate (Pb(OAc)2) in the perovskite precursor solution. We find that EDAI2 acts as an intermediate that can promote the formation of $γ$-CsPbI$_3$, while excess Pb(OAc)2 can further stabilize the $γ$-phase of CsPbI$_3$ perovskite. Consequently, improved crystallinity and morphology and reduced carrier recombination are observed in the CsPbI$_3$ films fabricated by the new method. By optimizing the hole transport layer of CsPbI$_3$ inverted architecture solar cells, we demonstrate up to 16.6% efficiencies, surpassing previous reports examining $γ$-CsPbI$_3$ in inverted PSCs. Notably, the encapsulated solar cells maintain 97% of their initial efficiency at room temperature and dim light for 25 days, demonstrating the synergistic effect of EDAI2 and Pb(OAc)2 on stabilizing $γ$-CsPbI$_3$ PSCs. |
| title | Towards low-temperature processing of efficient $γ$-CsPbI$_3$ perovskite solar cells |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.11636 |