Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells
To promote the performance of perovskite solar cells (PSCs), its theoretical power conversion efficiency (PCE) and high stability, elaborative defect passivation, and interfacial engineering at the molecular level are required to regulate the optoelectric properties and charge transporting process a...
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MDPI AG
2022-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/13/2748 |
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| author | He Xi Zhicheng Song Yonggang Guo Weijia Zhu Lisong Ding Weidong Zhu Dazheng Chen Chunfu Zhang |
| author_facet | He Xi Zhicheng Song Yonggang Guo Weijia Zhu Lisong Ding Weidong Zhu Dazheng Chen Chunfu Zhang |
| author_sort | He Xi |
| collection | DOAJ |
| description | To promote the performance of perovskite solar cells (PSCs), its theoretical power conversion efficiency (PCE) and high stability, elaborative defect passivation, and interfacial engineering at the molecular level are required to regulate the optoelectric properties and charge transporting process at the perovskite/hole transport layer (HTL) interfaces. Herein, we introduce for the first time a multifunctional dipole polymer poly(2-ethyl-2-oxazoline) (PEOz) between the perovskite and Spiro-OMeTAD HTL in planar n-i-p PSCs, which advances the PSCs toward both high efficiency and excellent stability by stimulating three beneficial effects. First, the ether–oxygen unshared electron pairs in PEOz chemically react with unsaturated Pb<sup>2+</sup> on the perovskite surfaces by forming a strong Pb–O bond, which effectively reduces the uncoordinated defects on the perovskite surfaces and enhances the absorption ability of the resulting PSCs. Second, the dipole induced by PEOz at the perovskite/HTL interface can decrease the HOMO and LUMO level of Spiro-OMeTAD and optimize the band alignment between these layers, thereby suppressing the interfacial recombination and accelerating the hole transport/extraction ability in the cell. Third, the hygroscopic PEOz thin film can protect perovskite film from water erosion by absorbing the water molecules before perovskite does. Finally, the PEOz-modified PSC exhibits an optimized PCE of 21.86%, with a high short-circuit current density (Jsc) of 24.88 mA/cm<sup>2</sup>, a fill factor (FF) of 0.79, and an open-circuit voltage (Voc) of 1.11 V. The unencapsulated devices also deliver excellent operation stability over 300 h in an ambient atmosphere with a humidity of 30~40% and more than 10 h under thermal stress. |
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| language | English |
| last_indexed | 2024-03-09T10:26:03Z |
| publishDate | 2022-07-01 |
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| series | Polymers |
| spelling | doaj.art-98b6596c44da45aeb2b6093cfb6d8e662023-12-01T21:39:58ZengMDPI AGPolymers2073-43602022-07-011413274810.3390/polym14132748Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar CellsHe Xi0Zhicheng Song1Yonggang Guo2Weijia Zhu3Lisong Ding4Weidong Zhu5Dazheng Chen6Chunfu Zhang7School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, ChinaState Key Discipline Laboratory of Wide Band Gap Semiconductor, School of Microelectronics, Xidian University, Xi’an 710071, ChinaQinghai Huanghe Hydropower Development Co., Ltd., Xi’an Solar Power Branch, Xi’an 710000, ChinaSchool of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, ChinaSchool of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, ChinaState Key Discipline Laboratory of Wide Band Gap Semiconductor, School of Microelectronics, Xidian University, Xi’an 710071, ChinaState Key Discipline Laboratory of Wide Band Gap Semiconductor, School of Microelectronics, Xidian University, Xi’an 710071, ChinaState Key Discipline Laboratory of Wide Band Gap Semiconductor, School of Microelectronics, Xidian University, Xi’an 710071, ChinaTo promote the performance of perovskite solar cells (PSCs), its theoretical power conversion efficiency (PCE) and high stability, elaborative defect passivation, and interfacial engineering at the molecular level are required to regulate the optoelectric properties and charge transporting process at the perovskite/hole transport layer (HTL) interfaces. Herein, we introduce for the first time a multifunctional dipole polymer poly(2-ethyl-2-oxazoline) (PEOz) between the perovskite and Spiro-OMeTAD HTL in planar n-i-p PSCs, which advances the PSCs toward both high efficiency and excellent stability by stimulating three beneficial effects. First, the ether–oxygen unshared electron pairs in PEOz chemically react with unsaturated Pb<sup>2+</sup> on the perovskite surfaces by forming a strong Pb–O bond, which effectively reduces the uncoordinated defects on the perovskite surfaces and enhances the absorption ability of the resulting PSCs. Second, the dipole induced by PEOz at the perovskite/HTL interface can decrease the HOMO and LUMO level of Spiro-OMeTAD and optimize the band alignment between these layers, thereby suppressing the interfacial recombination and accelerating the hole transport/extraction ability in the cell. Third, the hygroscopic PEOz thin film can protect perovskite film from water erosion by absorbing the water molecules before perovskite does. Finally, the PEOz-modified PSC exhibits an optimized PCE of 21.86%, with a high short-circuit current density (Jsc) of 24.88 mA/cm<sup>2</sup>, a fill factor (FF) of 0.79, and an open-circuit voltage (Voc) of 1.11 V. The unencapsulated devices also deliver excellent operation stability over 300 h in an ambient atmosphere with a humidity of 30~40% and more than 10 h under thermal stress.https://www.mdpi.com/2073-4360/14/13/2748perovskite solar celldipole polymerPEOzhygroscopicinterfacial engineering |
| spellingShingle | He Xi Zhicheng Song Yonggang Guo Weijia Zhu Lisong Ding Weidong Zhu Dazheng Chen Chunfu Zhang Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells Polymers perovskite solar cell dipole polymer PEOz hygroscopic interfacial engineering |
| title | Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells |
| title_full | Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells |
| title_fullStr | Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells |
| title_full_unstemmed | Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells |
| title_short | Interfacial Dipole poly(2-ethyl-2-oxazoline) Modification Triggers Simultaneous Band Alignment and Passivation for Air-Stable Perovskite Solar Cells |
| title_sort | interfacial dipole poly 2 ethyl 2 oxazoline modification triggers simultaneous band alignment and passivation for air stable perovskite solar cells |
| topic | perovskite solar cell dipole polymer PEOz hygroscopic interfacial engineering |
| url | https://www.mdpi.com/2073-4360/14/13/2748 |
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