Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals
In this work, colloidal perovskite nanocrystals (PNCs) are used to sensitize the photoconductivity of nanocrystalline ZnO films in the visible range. Nanocrystalline ZnO with a crystallite size of 12–16 nm was synthesized by precipitation of a zinc basic carbonate from an aqueous solution, followed...
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MDPI AG
2022-12-01
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| Series: | Nanomaterials |
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| author | Artem Chizhov Marina Rumyantseva Nikolay Khmelevsky Andrey Grunin |
| author_facet | Artem Chizhov Marina Rumyantseva Nikolay Khmelevsky Andrey Grunin |
| author_sort | Artem Chizhov |
| collection | DOAJ |
| description | In this work, colloidal perovskite nanocrystals (PNCs) are used to sensitize the photoconductivity of nanocrystalline ZnO films in the visible range. Nanocrystalline ZnO with a crystallite size of 12–16 nm was synthesized by precipitation of a zinc basic carbonate from an aqueous solution, followed by annealing at 300 °C. Perovskite oleic acid- and oleylamine-capped CsPbBr<sub>3</sub>, CsPb(Cl/Br)<sub>3</sub> and CsPb(Br/I)<sub>3</sub> PNCs with a size of 6–13 nm were synthesized by a hot injection method at 170 °C in 1-octadecene. Photoconductive nanocomposites were prepared by applying a hexane sol of PNCs to a thick (100 μm) polycrystalline conductive ZnO layer. The spectral dependence of the photoconductivity, the dependence of the photoconductivity on irradiation, and the relaxation of the photoconductivity of the obtained nanocomposites have been studied. Sensitization of ZnO by CsPbBr<sub>3</sub> and CsPb(Cl/Br)<sub>3</sub> PNCs leads to enhanced photoconductivity in the visible range, the maximum of which is observed at 460 and 500 nm, respectively; close to the absorption maximum of PNCs. Nanocomposites ZnO/CsPb(Br/I)<sub>3</sub> turned out to be practically not photosensitive when irradiated with light in the visible range. The data obtained are discussed in terms of the position of the energy levels of ZnO and PNCs and the probable PNCs photodegradation. The structure, morphology, composition, and optical properties of the synthesized nanocrystals have also been studied by XRD, TEM, and XPS. The results can be applied to the creation of artificial neuromorphic systems in the visible optical range. |
| first_indexed | 2024-03-09T17:38:10Z |
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| language | English |
| last_indexed | 2024-03-09T17:38:10Z |
| publishDate | 2022-12-01 |
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| series | Nanomaterials |
| spelling | doaj.art-e5cfde80353a44ddb9fcaf3978c6414f2023-11-24T11:48:58ZengMDPI AGNanomaterials2079-49912022-12-011223431610.3390/nano12234316Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide NanocrystalsArtem Chizhov0Marina Rumyantseva1Nikolay Khmelevsky2Andrey Grunin3Chemistry Department, Moscow State University, 119991 Moscow, RussiaChemistry Department, Moscow State University, 119991 Moscow, RussiaMaterial Properties Research Laboratory (LISM), Moscow State Technological University Stankin,127055 Moscow, RussiaFaculty of Physics, Lomonosov Moscow State University, 119991 Moscow, RussiaIn this work, colloidal perovskite nanocrystals (PNCs) are used to sensitize the photoconductivity of nanocrystalline ZnO films in the visible range. Nanocrystalline ZnO with a crystallite size of 12–16 nm was synthesized by precipitation of a zinc basic carbonate from an aqueous solution, followed by annealing at 300 °C. Perovskite oleic acid- and oleylamine-capped CsPbBr<sub>3</sub>, CsPb(Cl/Br)<sub>3</sub> and CsPb(Br/I)<sub>3</sub> PNCs with a size of 6–13 nm were synthesized by a hot injection method at 170 °C in 1-octadecene. Photoconductive nanocomposites were prepared by applying a hexane sol of PNCs to a thick (100 μm) polycrystalline conductive ZnO layer. The spectral dependence of the photoconductivity, the dependence of the photoconductivity on irradiation, and the relaxation of the photoconductivity of the obtained nanocomposites have been studied. Sensitization of ZnO by CsPbBr<sub>3</sub> and CsPb(Cl/Br)<sub>3</sub> PNCs leads to enhanced photoconductivity in the visible range, the maximum of which is observed at 460 and 500 nm, respectively; close to the absorption maximum of PNCs. Nanocomposites ZnO/CsPb(Br/I)<sub>3</sub> turned out to be practically not photosensitive when irradiated with light in the visible range. The data obtained are discussed in terms of the position of the energy levels of ZnO and PNCs and the probable PNCs photodegradation. The structure, morphology, composition, and optical properties of the synthesized nanocrystals have also been studied by XRD, TEM, and XPS. The results can be applied to the creation of artificial neuromorphic systems in the visible optical range.https://www.mdpi.com/2079-4991/12/23/4316ZnOperovskite nanocrystalsnanocompositessensitizationphotoconductivity |
| spellingShingle | Artem Chizhov Marina Rumyantseva Nikolay Khmelevsky Andrey Grunin Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals Nanomaterials ZnO perovskite nanocrystals nanocomposites sensitization photoconductivity |
| title | Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals |
| title_full | Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals |
| title_fullStr | Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals |
| title_full_unstemmed | Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals |
| title_short | Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals |
| title_sort | sensitization of zno photoconductivity in the visible range by colloidal cesium lead halide nanocrystals |
| topic | ZnO perovskite nanocrystals nanocomposites sensitization photoconductivity |
| url | https://www.mdpi.com/2079-4991/12/23/4316 |
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