Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres
We investigated the photoconductivity of single ZnO nanowire device as a function of the surrounding atmosphere, considering the comparison between reduced pressure, inert gas environments, and air. We show that after UV excitation the photocurrent persists for hours, in particular in vacuum, nitrog...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2014/184120 |
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| author | Davide Cammi Carsten Ronning |
| author_facet | Davide Cammi Carsten Ronning |
| author_sort | Davide Cammi |
| collection | DOAJ |
| description | We investigated the photoconductivity of single ZnO nanowire device as a function of the surrounding atmosphere, considering the comparison between reduced pressure, inert gas environments, and air. We show that after UV excitation the photocurrent persists for hours, in particular in vacuum, nitrogen, and argon. In the presence of oxygen, the photodecay rate is initially fast but then becomes considerably slower, resulting in a long persisting photo-conductivity tail. Our proposed model explains the persistence of the photoconductivity (PPC) in terms of band bending at the surface of the nanowires, which is related to the trapping of electrons from the conduction band. |
| format | Article |
| id | doaj-art-abb928c3cdee4c768876ee02415e7ec7 |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-abb928c3cdee4c768876ee02415e7ec72025-02-03T01:23:51ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242014-01-01201410.1155/2014/184120184120Persistent Photoconductivity in ZnO Nanowires in Different AtmospheresDavide Cammi0Carsten Ronning1Institute of Solid State Physics, Friedrich Schiller University of Jena, Max-Wien-Platz 1, 07743 Jena, GermanyInstitute of Solid State Physics, Friedrich Schiller University of Jena, Max-Wien-Platz 1, 07743 Jena, GermanyWe investigated the photoconductivity of single ZnO nanowire device as a function of the surrounding atmosphere, considering the comparison between reduced pressure, inert gas environments, and air. We show that after UV excitation the photocurrent persists for hours, in particular in vacuum, nitrogen, and argon. In the presence of oxygen, the photodecay rate is initially fast but then becomes considerably slower, resulting in a long persisting photo-conductivity tail. Our proposed model explains the persistence of the photoconductivity (PPC) in terms of band bending at the surface of the nanowires, which is related to the trapping of electrons from the conduction band.http://dx.doi.org/10.1155/2014/184120 |
| spellingShingle | Davide Cammi Carsten Ronning Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres Advances in Condensed Matter Physics |
| title | Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres |
| title_full | Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres |
| title_fullStr | Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres |
| title_full_unstemmed | Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres |
| title_short | Persistent Photoconductivity in ZnO Nanowires in Different Atmospheres |
| title_sort | persistent photoconductivity in zno nanowires in different atmospheres |
| url | http://dx.doi.org/10.1155/2014/184120 |
| work_keys_str_mv | AT davidecammi persistentphotoconductivityinznonanowiresindifferentatmospheres AT carstenronning persistentphotoconductivityinznonanowiresindifferentatmospheres |