High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates
As a developing technology for flexible electronic device fabrication, ultra-violet (UV) photodetectors (PDs) based on a ZnO nanostructure are an effective approach for large-area integration of sensors on nonconventional substrates, such as plastic or paper. However, photoconductive ZnO nanorods gr...
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doaj-d363179947fa4239b85b05ec5a8f74ab2020-11-25T01:54:18ZengMDPI AGNanomaterials2079-49912019-07-0198106710.3390/nano9081067nano9081067High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET SubstratesHafiz Muhammad Salman Ajmal0Fasihullah Khan1Noor Ul Huda2Sunjung Lee3Kiyun Nam4Hae Young Kim5Tae-Hyong Eom6Sam Dong Kim7Division of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, KoreaAs a developing technology for flexible electronic device fabrication, ultra-violet (UV) photodetectors (PDs) based on a ZnO nanostructure are an effective approach for large-area integration of sensors on nonconventional substrates, such as plastic or paper. However, photoconductive ZnO nanorods grown on flexible substrates have slow responses or recovery as well as low spectral responsivity <b><i>R</i></b> because of the native defects and inferior crystallinity of hydrothermally grown ZnO nanorods at low temperatures. In this study, ZnO nanorod crystallites are doped with Cu or Ni/Cu when grown on polyethylene terephthalate (PET) substrates in an attempt to improve the performance of flexible PDs. The doping with Ni/Cu or Cu not only improves the crystalline quality but also significantly suppresses the density of deep-level emission defects in as-grown ZnO nanorods, as demonstrated by X-ray diffraction and photoluminescence. Furthermore, the X-ray photoelectron spectroscopy analysis shows that doping with the transition metals significantly increases the oxygen bonding with metal ions with enhanced O/Zn stoichiometry in as-grown nanorods. The fabricated flexible PD devices based on an interdigitated electrode structure demonstrates a very high <b><i>R</i></b> of ~123 A/W, a high on-off current ratio of ~130, and a significant improvement in transient response speed exhibiting rise and fall time of ~8 and ~3 s, respectively, by using the ZnO nanorods codoped by Ni/Cu.https://www.mdpi.com/2079-4991/9/8/1067Flexible UV detectorNi/Cu codopingZnO nanorodsPET substratespectral responsivity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hafiz Muhammad Salman Ajmal Fasihullah Khan Noor Ul Huda Sunjung Lee Kiyun Nam Hae Young Kim Tae-Hyong Eom Sam Dong Kim |
spellingShingle |
Hafiz Muhammad Salman Ajmal Fasihullah Khan Noor Ul Huda Sunjung Lee Kiyun Nam Hae Young Kim Tae-Hyong Eom Sam Dong Kim High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates Nanomaterials Flexible UV detector Ni/Cu codoping ZnO nanorods PET substrate spectral responsivity |
author_facet |
Hafiz Muhammad Salman Ajmal Fasihullah Khan Noor Ul Huda Sunjung Lee Kiyun Nam Hae Young Kim Tae-Hyong Eom Sam Dong Kim |
author_sort |
Hafiz Muhammad Salman Ajmal |
title |
High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates |
title_short |
High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates |
title_full |
High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates |
title_fullStr |
High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates |
title_full_unstemmed |
High-Performance Flexible Ultraviolet Photodetectors with Ni/Cu-Codoped ZnO Nanorods Grown on PET Substrates |
title_sort |
high-performance flexible ultraviolet photodetectors with ni/cu-codoped zno nanorods grown on pet substrates |
publisher |
MDPI AG |
series |
Nanomaterials |
issn |
2079-4991 |
publishDate |
2019-07-01 |
description |
As a developing technology for flexible electronic device fabrication, ultra-violet (UV) photodetectors (PDs) based on a ZnO nanostructure are an effective approach for large-area integration of sensors on nonconventional substrates, such as plastic or paper. However, photoconductive ZnO nanorods grown on flexible substrates have slow responses or recovery as well as low spectral responsivity <b><i>R</i></b> because of the native defects and inferior crystallinity of hydrothermally grown ZnO nanorods at low temperatures. In this study, ZnO nanorod crystallites are doped with Cu or Ni/Cu when grown on polyethylene terephthalate (PET) substrates in an attempt to improve the performance of flexible PDs. The doping with Ni/Cu or Cu not only improves the crystalline quality but also significantly suppresses the density of deep-level emission defects in as-grown ZnO nanorods, as demonstrated by X-ray diffraction and photoluminescence. Furthermore, the X-ray photoelectron spectroscopy analysis shows that doping with the transition metals significantly increases the oxygen bonding with metal ions with enhanced O/Zn stoichiometry in as-grown nanorods. The fabricated flexible PD devices based on an interdigitated electrode structure demonstrates a very high <b><i>R</i></b> of ~123 A/W, a high on-off current ratio of ~130, and a significant improvement in transient response speed exhibiting rise and fall time of ~8 and ~3 s, respectively, by using the ZnO nanorods codoped by Ni/Cu. |
topic |
Flexible UV detector Ni/Cu codoping ZnO nanorods PET substrate spectral responsivity |
url |
https://www.mdpi.com/2079-4991/9/8/1067 |
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