Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands
Abstract The ligand exchange procedure of CsPbI3 perovskite quantum dots (PQDs) enables the fabrication of thick and conductive PQD solids that act as a photovoltaic absorber for solution‐processed thin‐film solar cells. However, the ligand‐exchanged CsPbI3 PQD solids suffer from deterioration in ph...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-08-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202301793 |
| _version_ | 1828718450353111040 |
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| author | Sanghun Han Gayoung Seo Taeyeong Yong Seongmin Choi Younghoon Kim Jongmin Choi |
| author_facet | Sanghun Han Gayoung Seo Taeyeong Yong Seongmin Choi Younghoon Kim Jongmin Choi |
| author_sort | Sanghun Han |
| collection | DOAJ |
| description | Abstract The ligand exchange procedure of CsPbI3 perovskite quantum dots (PQDs) enables the fabrication of thick and conductive PQD solids that act as a photovoltaic absorber for solution‐processed thin‐film solar cells. However, the ligand‐exchanged CsPbI3 PQD solids suffer from deterioration in photovoltaic performance and ambient stability due to the surface traps, such as uncoordinated Pb2+ sites on the PQD surface, which are generated after the conventional ligand exchange process using ionic short‐chain ligands dissolved in polar solvents. Herein, a facile surface stabilization is demonstrated that can simultaneously improve the photovoltaic performance and ambient stability of CsPbI3 PQD photovoltaic absorber using covalent short‐chain triphenylphosphine oxide (TPPO) ligands dissolved in a nonpolar solvent. It is found that the TPPO ligand can be covalently bound to uncoordinated Pb2+ sites and the nonpolar solvent octane can completely preserve the PQD surface components. Owing to their synergetic effects, the CsPbI3 PQD photovoltaic absorber stabilized using the TPPO ligand solution dissolved in octane exhibit higher optoelectrical properties and ambient stability than the control absorber. Consequently, CsPbI3 PQD solar cells composed of PQD photovoltaic absorbers fabricated via surface stabilization strategy provide an improved power conversion efficiency of 15.4% and an enhanced device stability. |
| first_indexed | 2024-03-12T14:43:51Z |
| format | Article |
| id | doaj.art-515d75cb8c744975b01d21d1b9f8e746 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-03-12T14:43:51Z |
| publishDate | 2023-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-515d75cb8c744975b01d21d1b9f8e7462023-08-16T02:23:01ZengWileyAdvanced Science2198-38442023-08-011023n/an/a10.1002/advs.202301793Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent LigandsSanghun Han0Gayoung Seo1Taeyeong Yong2Seongmin Choi3Younghoon Kim4Jongmin Choi5Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of KoreaDepartment of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of KoreaDepartment of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of KoreaDepartment of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of KoreaDepartment of Chemistry Kookmin University Seoul 02707 Republic of KoreaDepartment of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of KoreaAbstract The ligand exchange procedure of CsPbI3 perovskite quantum dots (PQDs) enables the fabrication of thick and conductive PQD solids that act as a photovoltaic absorber for solution‐processed thin‐film solar cells. However, the ligand‐exchanged CsPbI3 PQD solids suffer from deterioration in photovoltaic performance and ambient stability due to the surface traps, such as uncoordinated Pb2+ sites on the PQD surface, which are generated after the conventional ligand exchange process using ionic short‐chain ligands dissolved in polar solvents. Herein, a facile surface stabilization is demonstrated that can simultaneously improve the photovoltaic performance and ambient stability of CsPbI3 PQD photovoltaic absorber using covalent short‐chain triphenylphosphine oxide (TPPO) ligands dissolved in a nonpolar solvent. It is found that the TPPO ligand can be covalently bound to uncoordinated Pb2+ sites and the nonpolar solvent octane can completely preserve the PQD surface components. Owing to their synergetic effects, the CsPbI3 PQD photovoltaic absorber stabilized using the TPPO ligand solution dissolved in octane exhibit higher optoelectrical properties and ambient stability than the control absorber. Consequently, CsPbI3 PQD solar cells composed of PQD photovoltaic absorbers fabricated via surface stabilization strategy provide an improved power conversion efficiency of 15.4% and an enhanced device stability.https://doi.org/10.1002/advs.202301793covalent ligandsCsPbI3 perovskite quantum dotsnonpolar solventsphotovoltaic absorberssolar cells |
| spellingShingle | Sanghun Han Gayoung Seo Taeyeong Yong Seongmin Choi Younghoon Kim Jongmin Choi Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands Advanced Science covalent ligands CsPbI3 perovskite quantum dots nonpolar solvents photovoltaic absorbers solar cells |
| title | Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands |
| title_full | Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands |
| title_fullStr | Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands |
| title_full_unstemmed | Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands |
| title_short | Stabilized Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersible Covalent Ligands |
| title_sort | stabilized perovskite quantum dot solids via nonpolar solvent dispersible covalent ligands |
| topic | covalent ligands CsPbI3 perovskite quantum dots nonpolar solvents photovoltaic absorbers solar cells |
| url | https://doi.org/10.1002/advs.202301793 |
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