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Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance
The persistent nature of the increased conductivity upon removal of incident illumination, described by the term persistent photoconductivity (PPC), in ZnO films is sensitive to their defect states. PPC can be viewed as a process of charge storage with relevant defects. To evaluate charge storage qu...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080277/ https://www.ncbi.nlm.nih.gov/pubmed/35540519 http://dx.doi.org/10.1039/c8ra02318b |
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author | Lu, Linzhi Jiang, Xiaotong Peng, Huiqiong Zeng, Dawen Xie, Changsheng |
author_facet | Lu, Linzhi Jiang, Xiaotong Peng, Huiqiong Zeng, Dawen Xie, Changsheng |
author_sort | Lu, Linzhi |
collection | PubMed |
description | The persistent nature of the increased conductivity upon removal of incident illumination, described by the term persistent photoconductivity (PPC), in ZnO films is sensitive to their defect states. PPC can be viewed as a process of charge storage with relevant defects. To evaluate charge storage quantitatively, in this work, some thought-provoking characteristic quantities were derived from a photocurrent–time curve acquired by testing the photoelectric properties of ZnO under on and off UV illumination. Q(uo) was defined as the obtained charge number per unit voltage during the light-on phase, while Q(us) was defined as the storage charge number during the light-off phase. η was acquired by dividing Q(us) by Q(uo) to measure the storage efficiency after the removal of UV light. On the basis of previous work, it was assumed that the PPC of ZnO originated from the unique property of V(0)(O). Meanwhile, this report reveals that the intrinsic defects V(O)(2+), V(O)(+), V(0)(Zn) will enhance Q(uo) and Q(us) but decrease η in the pure ZnO nanorod array film. The extrinsic defect Cu(0)(Zn) introduced by coating the ZnO nanorod array film in an ethanol solution of copper acetate suppresses Q(uo) and Q(us) but promotes the increase of η. Since the whole methodology originated from a series of physical definitions, it can be easily extended to other materials with similar PPC effects. |
format | Online Article Text |
id | pubmed-9080277 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90802772022-05-09 Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance Lu, Linzhi Jiang, Xiaotong Peng, Huiqiong Zeng, Dawen Xie, Changsheng RSC Adv Chemistry The persistent nature of the increased conductivity upon removal of incident illumination, described by the term persistent photoconductivity (PPC), in ZnO films is sensitive to their defect states. PPC can be viewed as a process of charge storage with relevant defects. To evaluate charge storage quantitatively, in this work, some thought-provoking characteristic quantities were derived from a photocurrent–time curve acquired by testing the photoelectric properties of ZnO under on and off UV illumination. Q(uo) was defined as the obtained charge number per unit voltage during the light-on phase, while Q(us) was defined as the storage charge number during the light-off phase. η was acquired by dividing Q(us) by Q(uo) to measure the storage efficiency after the removal of UV light. On the basis of previous work, it was assumed that the PPC of ZnO originated from the unique property of V(0)(O). Meanwhile, this report reveals that the intrinsic defects V(O)(2+), V(O)(+), V(0)(Zn) will enhance Q(uo) and Q(us) but decrease η in the pure ZnO nanorod array film. The extrinsic defect Cu(0)(Zn) introduced by coating the ZnO nanorod array film in an ethanol solution of copper acetate suppresses Q(uo) and Q(us) but promotes the increase of η. Since the whole methodology originated from a series of physical definitions, it can be easily extended to other materials with similar PPC effects. The Royal Society of Chemistry 2018-05-04 /pmc/articles/PMC9080277/ /pubmed/35540519 http://dx.doi.org/10.1039/c8ra02318b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Lu, Linzhi Jiang, Xiaotong Peng, Huiqiong Zeng, Dawen Xie, Changsheng Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title | Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title_full | Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title_fullStr | Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title_full_unstemmed | Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title_short | Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance |
title_sort | quantitative characterization of the long-term charge storage of a zno-based nanorod array film through persistent photoconductance |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080277/ https://www.ncbi.nlm.nih.gov/pubmed/35540519 http://dx.doi.org/10.1039/c8ra02318b |
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