Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer
CuAlO<sub>2</sub> was synthesized by a hydrothermal method, in which the Cu–O dimers were incorporated by simply altering the ratio of the reactants and the temperature. The incorporation process increases the grain size in CuAlO<sub>2</sub>, and modulates the work function a...
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MDPI AG
2023-04-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/9/1472 |
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| author | Yuchen Long Ziling Zhang Xiutao Yang Yang Liu Guangcan Luo Jingquan Zhang Wei Li |
| author_facet | Yuchen Long Ziling Zhang Xiutao Yang Yang Liu Guangcan Luo Jingquan Zhang Wei Li |
| author_sort | Yuchen Long |
| collection | DOAJ |
| description | CuAlO<sub>2</sub> was synthesized by a hydrothermal method, in which the Cu–O dimers were incorporated by simply altering the ratio of the reactants and the temperature. The incorporation process increases the grain size in CuAlO<sub>2</sub>, and modulates the work function and binding energies for CuAlO<sub>2</sub> due to the partial substitution of Cu<sup>+</sup> 3d<sup>10</sup> with Cu<sup>2+</sup> 3d<sup>9</sup> orbitals in the valence band maximum by alloying non-isovalent Cu–O with a CuAlO<sub>2</sub> host. Based on the ZnO nanorod arrays (NRs) ultraviolet photodetector, CuAlO<sub>2</sub>/Cu–O fabricated by the low-cost drop-coating method was used as the p-type hole transport layer. The incorporation of the Cu–O clusters into CuAlO<sub>2</sub> lattice to enhance the conductivity of CuAlO<sub>2</sub> is an effective way for improving ZnO NRs/CuAlO<sub>2</sub> device performance. The photodetectors exhibit significant diode behavior, with a rectification ratio approaching 30 at ±1 V, and a dark saturation current density 0.81 mA cm<sup>−2</sup>. The responsivity of the ZnO-NRs-based UV photodetector increases from 13.2 to 91.3 mA/W at 0 V bias, with an increase in the detectivity from 2.35 × 10<sup>10</sup> to 1.71 × 10<sup>11</sup> Jones. Furthermore, the ZnO NRs/[CuAlO<sub>2</sub>/Cu–O] photodetector exhibits a maximum responsivity of 5002 mA/W at 1.5 V bias under 375 nm UV illumination. |
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| language | English |
| last_indexed | 2024-03-11T04:11:38Z |
| publishDate | 2023-04-01 |
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| series | Nanomaterials |
| spelling | doaj.art-e16e67800cff47cda11ffe253124d6242023-11-17T23:26:32ZengMDPI AGNanomaterials2079-49912023-04-01139147210.3390/nano13091472Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type LayerYuchen Long0Ziling Zhang1Xiutao Yang2Yang Liu3Guangcan Luo4Jingquan Zhang5Wei Li6College of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaSchool of Materials Science and Engineering, Guizhou Minzu University, Guiyang 550025, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaCollege of Materials Science and Engineering, Sichuan University, Chengdu 610064, ChinaCuAlO<sub>2</sub> was synthesized by a hydrothermal method, in which the Cu–O dimers were incorporated by simply altering the ratio of the reactants and the temperature. The incorporation process increases the grain size in CuAlO<sub>2</sub>, and modulates the work function and binding energies for CuAlO<sub>2</sub> due to the partial substitution of Cu<sup>+</sup> 3d<sup>10</sup> with Cu<sup>2+</sup> 3d<sup>9</sup> orbitals in the valence band maximum by alloying non-isovalent Cu–O with a CuAlO<sub>2</sub> host. Based on the ZnO nanorod arrays (NRs) ultraviolet photodetector, CuAlO<sub>2</sub>/Cu–O fabricated by the low-cost drop-coating method was used as the p-type hole transport layer. The incorporation of the Cu–O clusters into CuAlO<sub>2</sub> lattice to enhance the conductivity of CuAlO<sub>2</sub> is an effective way for improving ZnO NRs/CuAlO<sub>2</sub> device performance. The photodetectors exhibit significant diode behavior, with a rectification ratio approaching 30 at ±1 V, and a dark saturation current density 0.81 mA cm<sup>−2</sup>. The responsivity of the ZnO-NRs-based UV photodetector increases from 13.2 to 91.3 mA/W at 0 V bias, with an increase in the detectivity from 2.35 × 10<sup>10</sup> to 1.71 × 10<sup>11</sup> Jones. Furthermore, the ZnO NRs/[CuAlO<sub>2</sub>/Cu–O] photodetector exhibits a maximum responsivity of 5002 mA/W at 1.5 V bias under 375 nm UV illumination.https://www.mdpi.com/2079-4991/13/9/1472ZnO nanorod arraysUV photodetectorspectral response |
| spellingShingle | Yuchen Long Ziling Zhang Xiutao Yang Yang Liu Guangcan Luo Jingquan Zhang Wei Li Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer Nanomaterials ZnO nanorod arrays UV photodetector spectral response |
| title | Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer |
| title_full | Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer |
| title_fullStr | Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer |
| title_full_unstemmed | Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer |
| title_short | Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO<sub>2</sub> P-Type Layer |
| title_sort | enhanced spectral response of zno nanorod array based ultraviolet photodetectors by alloying non isovalent cu o with cualo sub 2 sub p type layer |
| topic | ZnO nanorod arrays UV photodetector spectral response |
| url | https://www.mdpi.com/2079-4991/13/9/1472 |
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