Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells
The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI2Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI2Br perovskite. However, most modifiers behave h...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-09-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847821000253 |
| _version_ | 1827833948823093248 |
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| author | Xingyu Pu Jian Han Shuangjie Wang Hui Zhou Qi Cao Jiabao Yang Ziwei He Xuanhua Li |
| author_facet | Xingyu Pu Jian Han Shuangjie Wang Hui Zhou Qi Cao Jiabao Yang Ziwei He Xuanhua Li |
| author_sort | Xingyu Pu |
| collection | DOAJ |
| description | The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI2Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI2Br perovskite. However, most modifiers behave high volatility and insulation, not enough to further develop the CsPbI2Br solar cells. Herein, an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI2Br film surface, yielding a compact film with enhanced crystallinity. The surface trap states of CsPbI2Br film are effectively passivated via the interaction between carbonyl group of [PEVIM]Cl and uncoordinated metal cations of CsPbI2Br perovskite, leading to charge recombination suppression and charge transport enhancement. Consequently, the power conversion efficiency (PCE) of [PEVIM]Cl modified CsPbI2Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V. Moreover, the non-encapsulated device presents excellent thermal stability, still maintaining 91% PCE when heated at 85 °C in nitrogen atmosphere for 360 h. Meanwhile, the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h. This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices. |
| first_indexed | 2024-03-12T05:41:50Z |
| format | Article |
| id | doaj.art-ad2ba95a855444ff8ccd0e1a85128ff2 |
| institution | Directory Open Access Journal |
| issn | 2352-8478 |
| language | English |
| last_indexed | 2024-03-12T05:41:50Z |
| publishDate | 2021-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj.art-ad2ba95a855444ff8ccd0e1a85128ff22023-09-03T06:01:34ZengElsevierJournal of Materiomics2352-84782021-09-017510391048Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cellsXingyu Pu0Jian Han1Shuangjie Wang2Hui Zhou3Qi Cao4Jiabao Yang5Ziwei He6Xuanhua Li7State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, ChinaState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, China; Northwestern Polytechnical University-Queen Marry, University of London (NPU-QMUL) Joint Research Institute of Advanced Materials and Structures (JRI-AMAS), Xián, 710072, China; Corresponding author. State key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xián, 710072, China.The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI2Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI2Br perovskite. However, most modifiers behave high volatility and insulation, not enough to further develop the CsPbI2Br solar cells. Herein, an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI2Br film surface, yielding a compact film with enhanced crystallinity. The surface trap states of CsPbI2Br film are effectively passivated via the interaction between carbonyl group of [PEVIM]Cl and uncoordinated metal cations of CsPbI2Br perovskite, leading to charge recombination suppression and charge transport enhancement. Consequently, the power conversion efficiency (PCE) of [PEVIM]Cl modified CsPbI2Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V. Moreover, the non-encapsulated device presents excellent thermal stability, still maintaining 91% PCE when heated at 85 °C in nitrogen atmosphere for 360 h. Meanwhile, the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h. This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.http://www.sciencedirect.com/science/article/pii/S2352847821000253Inorganic perovskitesCsPbI2BrIonic liquidSurface modificationHigh efficiency |
| spellingShingle | Xingyu Pu Jian Han Shuangjie Wang Hui Zhou Qi Cao Jiabao Yang Ziwei He Xuanhua Li Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells Journal of Materiomics Inorganic perovskites CsPbI2Br Ionic liquid Surface modification High efficiency |
| title | Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells |
| title_full | Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells |
| title_fullStr | Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells |
| title_full_unstemmed | Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells |
| title_short | Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells |
| title_sort | surface modification with ionic liquid for efficient cspbi2br perovskite solar cells |
| topic | Inorganic perovskites CsPbI2Br Ionic liquid Surface modification High efficiency |
| url | http://www.sciencedirect.com/science/article/pii/S2352847821000253 |
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