Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance
The scaffold layer plays an important role in transporting electrons and preventing carrier recombination in mesoporous perovskite solar cells (PSCs), so the engineering of the interface between the scaffold layer and the light absorption layer has attracted widespread concern. In this work, vertica...
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/20/3653 |
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| author | Jiandong Yang Jun Wang Wenshu Yang Ying Zhu Shuang Feng Pengyu Su Wuyou Fu |
| author_facet | Jiandong Yang Jun Wang Wenshu Yang Ying Zhu Shuang Feng Pengyu Su Wuyou Fu |
| author_sort | Jiandong Yang |
| collection | DOAJ |
| description | The scaffold layer plays an important role in transporting electrons and preventing carrier recombination in mesoporous perovskite solar cells (PSCs), so the engineering of the interface between the scaffold layer and the light absorption layer has attracted widespread concern. In this work, vertically grown TiO<sub>2</sub> nanorods (NRs) as scaffold layers are fabricated and further treated with TiCl<sub>4</sub> aqueous solution. It can be found that a thin brookite TiO<sub>2</sub> nanoparticle (NP) layer is formed by the chemical bath deposition (CBD) method on the surface of every rutile NR with a low annealing temperature (150 °C), which is beneficial for the infiltration and growth of perovskite. The PSC based on the TiO<sub>2</sub> NR/brookite NP structure shows the best power conversion of 15.2%, which is 56.37% higher than that of the PSC based on bare NRs (9.72%). This complex structure presents an improved pore filling fraction and better carrier transport capability with less trap-assisted carrier recombination. In addition, low-annealing-temperature-formed brookite NPs possess a more suitable edge potential for electrons to transport from the perovskite layer to the electron collection layer when compared with high-annealing-temperature-formed anatase NPs. The brookite phase TiO<sub>2</sub> fabricated at a low temperature presents great potential for flexible PSCs. |
| first_indexed | 2024-03-09T19:40:24Z |
| format | Article |
| id | doaj.art-4af4e4291b274b5ebca67b8320529b91 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T19:40:24Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj.art-4af4e4291b274b5ebca67b8320529b912023-11-24T01:41:06ZengMDPI AGNanomaterials2079-49912022-10-011220365310.3390/nano12203653Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved PerformanceJiandong Yang0Jun Wang1Wenshu Yang2Ying Zhu3Shuang Feng4Pengyu Su5Wuyou Fu6State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaSchool of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaCollege of Mathmatics and Physics, Inner Mongolia Minzu University, Tongliao 028000, ChinaSchool of Electronic Information Engineering, Yangtze Normal University, Chongqing 408100, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaThe scaffold layer plays an important role in transporting electrons and preventing carrier recombination in mesoporous perovskite solar cells (PSCs), so the engineering of the interface between the scaffold layer and the light absorption layer has attracted widespread concern. In this work, vertically grown TiO<sub>2</sub> nanorods (NRs) as scaffold layers are fabricated and further treated with TiCl<sub>4</sub> aqueous solution. It can be found that a thin brookite TiO<sub>2</sub> nanoparticle (NP) layer is formed by the chemical bath deposition (CBD) method on the surface of every rutile NR with a low annealing temperature (150 °C), which is beneficial for the infiltration and growth of perovskite. The PSC based on the TiO<sub>2</sub> NR/brookite NP structure shows the best power conversion of 15.2%, which is 56.37% higher than that of the PSC based on bare NRs (9.72%). This complex structure presents an improved pore filling fraction and better carrier transport capability with less trap-assisted carrier recombination. In addition, low-annealing-temperature-formed brookite NPs possess a more suitable edge potential for electrons to transport from the perovskite layer to the electron collection layer when compared with high-annealing-temperature-formed anatase NPs. The brookite phase TiO<sub>2</sub> fabricated at a low temperature presents great potential for flexible PSCs.https://www.mdpi.com/2079-4991/12/20/3653brookitenanorodspore fillingperovskite solar cellinterfacial modificationenergy band |
| spellingShingle | Jiandong Yang Jun Wang Wenshu Yang Ying Zhu Shuang Feng Pengyu Su Wuyou Fu Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance Nanomaterials brookite nanorods pore filling perovskite solar cell interfacial modification energy band |
| title | Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance |
| title_full | Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance |
| title_fullStr | Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance |
| title_full_unstemmed | Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance |
| title_short | Low-Temperature Processed Brookite Interfacial Modification for Perovskite Solar Cells with Improved Performance |
| title_sort | low temperature processed brookite interfacial modification for perovskite solar cells with improved performance |
| topic | brookite nanorods pore filling perovskite solar cell interfacial modification energy band |
| url | https://www.mdpi.com/2079-4991/12/20/3653 |
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