A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing
Abstract Hole‐transport layers (HTL) in perovskite solar cells (PSCs) with an n‐i‐p structure are commonly doped by bis(trifluoromethane)sulfonimide (TFSI) salts to enhance hole conduction. While lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dopant is a widely used and effective dopant, it has...
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Wiley
2025-02-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202412959 |
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| author | Seong‐Jin Jeong Sung Hwan Park Siwon Yun Meng Qiang Li Dasol Kim Yongchan Kim Yun Hee Chang Jaewon Lee Jongchul Lim Tae‐Youl Yang |
| author_facet | Seong‐Jin Jeong Sung Hwan Park Siwon Yun Meng Qiang Li Dasol Kim Yongchan Kim Yun Hee Chang Jaewon Lee Jongchul Lim Tae‐Youl Yang |
| author_sort | Seong‐Jin Jeong |
| collection | DOAJ |
| description | Abstract Hole‐transport layers (HTL) in perovskite solar cells (PSCs) with an n‐i‐p structure are commonly doped by bis(trifluoromethane)sulfonimide (TFSI) salts to enhance hole conduction. While lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dopant is a widely used and effective dopant, it has significant limitations, including the need for additional solvents and additives, environmental sensitivity, unintended oxidation, and dopant migration, which can lead to lower stability of PSCs. A novel ionic liquid, 1‐(2‐methoxyethyl)‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (MMPyTFSI), is explored as an alternative dopant for 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐OMeTAD). MMPy ions act as a surface passivator, reducing defects on the perovskite surface, while TFSI ions facilitate p‐type doping. MMPyTFSI functions as an efficient dopant, maintaining excellent performance even when tetrahydrofuran (THF) is utilized as a solvent in place of chlorobenzene (CB), while significantly reducing the environmental impact of the process. The optimized PSC achieves a power conversion efficiency (PCE) of 23.10% and demonstrates enhanced long‐term stability in all aging tests for over 1000 h in a humid atmosphere, at high temperature, and under simulated sunlight illumination. These results demonstrate that MMPyTFSI is an effective and environmentally friendly dopant for producing stable and efficient PSCs. |
| format | Article |
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| issn | 2198-3844 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj-art-90543dd0f6cc40b8a4bd1cd73001a1742025-08-20T01:51:48ZengWileyAdvanced Science2198-38442025-02-01128n/an/a10.1002/advs.202412959A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent ProcessingSeong‐Jin Jeong0Sung Hwan Park1Siwon Yun2Meng Qiang Li3Dasol Kim4Yongchan Kim5Yun Hee Chang6Jaewon Lee7Jongchul Lim8Tae‐Youl Yang9Department of Materials Science and Engineering Chungnam National University 99 Daehak‐ro Yuseong‐gu Daejeon 34134 Republic of KoreaDivision of Advanced Materials Korea Research Institute of Chemical Technology (KRICT) 141 Gajeong‐ro, Yuseong‐gu Daejeon 34114 Republic of KoreaGraduate School of Energy Science and Technology (GEST) Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 Republic of KoreaDepartment of Chemical Engineering and Applied Chemistry Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 South KoreaDepartment of Chemical Engineering and Applied Chemistry Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 South KoreaDepartment of Chemical Engineering and Applied Chemistry Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 South KoreaDepartment of Materials Science and Engineering Chungnam National University 99 Daehak‐ro Yuseong‐gu Daejeon 34134 Republic of KoreaDepartment of Chemical Engineering and Applied Chemistry Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 South KoreaGraduate School of Energy Science and Technology (GEST) Chungnam National University 99 Daehak‐ro, Yuseong‐gu Daejeon 34134 Republic of KoreaDepartment of Materials Science and Engineering Chungnam National University 99 Daehak‐ro Yuseong‐gu Daejeon 34134 Republic of KoreaAbstract Hole‐transport layers (HTL) in perovskite solar cells (PSCs) with an n‐i‐p structure are commonly doped by bis(trifluoromethane)sulfonimide (TFSI) salts to enhance hole conduction. While lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dopant is a widely used and effective dopant, it has significant limitations, including the need for additional solvents and additives, environmental sensitivity, unintended oxidation, and dopant migration, which can lead to lower stability of PSCs. A novel ionic liquid, 1‐(2‐methoxyethyl)‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (MMPyTFSI), is explored as an alternative dopant for 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐OMeTAD). MMPy ions act as a surface passivator, reducing defects on the perovskite surface, while TFSI ions facilitate p‐type doping. MMPyTFSI functions as an efficient dopant, maintaining excellent performance even when tetrahydrofuran (THF) is utilized as a solvent in place of chlorobenzene (CB), while significantly reducing the environmental impact of the process. The optimized PSC achieves a power conversion efficiency (PCE) of 23.10% and demonstrates enhanced long‐term stability in all aging tests for over 1000 h in a humid atmosphere, at high temperature, and under simulated sunlight illumination. These results demonstrate that MMPyTFSI is an effective and environmentally friendly dopant for producing stable and efficient PSCs.https://doi.org/10.1002/advs.202412959dopanthole transport layerionic liquidperovskite solar cellssurface passivation |
| spellingShingle | Seong‐Jin Jeong Sung Hwan Park Siwon Yun Meng Qiang Li Dasol Kim Yongchan Kim Yun Hee Chang Jaewon Lee Jongchul Lim Tae‐Youl Yang A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing Advanced Science dopant hole transport layer ionic liquid perovskite solar cells surface passivation |
| title | A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing |
| title_full | A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing |
| title_fullStr | A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing |
| title_full_unstemmed | A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing |
| title_short | A Versatile Ionic Liquid Additive for Perovskite Solar Cells: Surface Modification, Hole Transport Layer Doping, and Green Solvent Processing |
| title_sort | versatile ionic liquid additive for perovskite solar cells surface modification hole transport layer doping and green solvent processing |
| topic | dopant hole transport layer ionic liquid perovskite solar cells surface passivation |
| url | https://doi.org/10.1002/advs.202412959 |
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