Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature
SnO<sub>2</sub> has attracted much attention due to its low-temperature synthesis (ca. 140 °C), high electron mobility, and low-cost manufacturing. However, lattice mismatch and oxygen vacancies at the SnO<sub>2</sub>/CsPbI<sub>3−x</sub>Br<sub>x</sub>...
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MDPI AG
2023-08-01
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| author | Tao Xue Ting Li Dandan Chen Xiao Wang Kunping Guo Qiang Wang Fanghui Zhang |
| author_facet | Tao Xue Ting Li Dandan Chen Xiao Wang Kunping Guo Qiang Wang Fanghui Zhang |
| author_sort | Tao Xue |
| collection | DOAJ |
| description | SnO<sub>2</sub> has attracted much attention due to its low-temperature synthesis (ca. 140 °C), high electron mobility, and low-cost manufacturing. However, lattice mismatch and oxygen vacancies at the SnO<sub>2</sub>/CsPbI<sub>3−x</sub>Br<sub>x</sub> interface generally lead to undesirable nonradiative recombination in optoelectronic devices. The traditional TiO<sub>2</sub> used as the electron transport layer (ETL) for all-inorganic perovskite solar cells (PSCs) requires high-temperature sintering and crystallization, which are not suitable for the promising flexible PSCs and tandem solar cells, raising concerns about surface defects and device uniformity. To address these challenges, we present a bilayer ETL consisting of a SnO<sub>2</sub> layer using electron beam evaporation and a TiO<sub>2</sub> layer through the hydrothermal method, resulting in an enhanced performance of the perovskite solar cell. The bilayer device exhibits an improved power conversion efficiency of 11.48% compared to the single-layer device (8.09%). The average fill factor of the bilayer electron transport layer is approximately 15% higher compared to the single-layer electron transport layer. Through a systematic investigation of the use of ETL for CsPb<sub>3−x</sub>Br<sub>x</sub> PSCs on optical and electronic properties, we demonstrate that the SnO<sub>2</sub>/TiO<sub>2</sub> is an efficient bilayer ETL for PSCs as it significantly enhances the charge extraction capability, suppresses carrier recombination at the ETL/perovskite interface, facilitates efficient photogenerated carrier separation and transport, and provides high current density and reduced hysteresis. |
| first_indexed | 2024-03-10T23:43:29Z |
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| last_indexed | 2024-03-10T23:43:29Z |
| publishDate | 2023-08-01 |
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| spelling | doaj.art-3df1ca37fe2e4b4db667dafe81e2cb8c2023-11-19T02:13:21ZengMDPI AGMicromachines2072-666X2023-08-01148154910.3390/mi14081549Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low TemperatureTao Xue0Ting Li1Dandan Chen2Xiao Wang3Kunping Guo4Qiang Wang5Fanghui Zhang6School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSchool of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, ChinaSnO<sub>2</sub> has attracted much attention due to its low-temperature synthesis (ca. 140 °C), high electron mobility, and low-cost manufacturing. However, lattice mismatch and oxygen vacancies at the SnO<sub>2</sub>/CsPbI<sub>3−x</sub>Br<sub>x</sub> interface generally lead to undesirable nonradiative recombination in optoelectronic devices. The traditional TiO<sub>2</sub> used as the electron transport layer (ETL) for all-inorganic perovskite solar cells (PSCs) requires high-temperature sintering and crystallization, which are not suitable for the promising flexible PSCs and tandem solar cells, raising concerns about surface defects and device uniformity. To address these challenges, we present a bilayer ETL consisting of a SnO<sub>2</sub> layer using electron beam evaporation and a TiO<sub>2</sub> layer through the hydrothermal method, resulting in an enhanced performance of the perovskite solar cell. The bilayer device exhibits an improved power conversion efficiency of 11.48% compared to the single-layer device (8.09%). The average fill factor of the bilayer electron transport layer is approximately 15% higher compared to the single-layer electron transport layer. Through a systematic investigation of the use of ETL for CsPb<sub>3−x</sub>Br<sub>x</sub> PSCs on optical and electronic properties, we demonstrate that the SnO<sub>2</sub>/TiO<sub>2</sub> is an efficient bilayer ETL for PSCs as it significantly enhances the charge extraction capability, suppresses carrier recombination at the ETL/perovskite interface, facilitates efficient photogenerated carrier separation and transport, and provides high current density and reduced hysteresis.https://www.mdpi.com/2072-666X/14/8/1549perovskite solar cellsbilayer electron transfer layerelectron beam evaporation |
| spellingShingle | Tao Xue Ting Li Dandan Chen Xiao Wang Kunping Guo Qiang Wang Fanghui Zhang Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature Micromachines perovskite solar cells bilayer electron transfer layer electron beam evaporation |
| title | Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature |
| title_full | Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature |
| title_fullStr | Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature |
| title_full_unstemmed | Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature |
| title_short | Preparation of TiO<sub>2</sub>/SnO<sub>2</sub> Electron Transport Layer for Performance Enhancement of All-Inorganic Perovskite Solar Cells Using Electron Beam Evaporation at Low Temperature |
| title_sort | preparation of tio sub 2 sub sno sub 2 sub electron transport layer for performance enhancement of all inorganic perovskite solar cells using electron beam evaporation at low temperature |
| topic | perovskite solar cells bilayer electron transfer layer electron beam evaporation |
| url | https://www.mdpi.com/2072-666X/14/8/1549 |
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