Tunable UV- and Visible-Light Photoresponse Based on p-ZnO Nanostructures/n-ZnO/Glass Peppered with Au Nanoparticles

Hsu, Cheng-Liang; Lin, Yu Hong; Wang, Liang Kai; Hsueh, Ting-Jen; Chang, Shoou Jinn

doi:10.1021/acsami.7b03216

Cited by 58 publications

(43 citation statements)

References 28 publications

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“…From Figure S1 (Supporting Information), the photoluminescence spectra obtained at room temperature show the near band edge peak at 385 and 390 nm for pure ZnO and Ag‐doped ZnO, respectively, indicating that Ag doping in ZnO can slightly reduce the band gap of the nanofibers. Owing to the plasma resonance and light scattering at Ag nanoparticles, the emission of Ag‐doped ZnO is a little higher than that of pure ZnO, illustrating higher recombination rate.…”

Section: Resultsmentioning

confidence: 99%

Novel Transparent and Self‐Powered UV Photodetector Based on Crossed ZnO Nanofiber Array Homojunction

Zhang

Teng

et al. 2018

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A novel self-powered UV photodetector based on electrospun ZnO nanofiber arrays is introduced. Aligned pure ZnO nanofibers and Ag-doped p-type ZnO nanofibers are processed perpendicular to each other, and p-n junction arrays of ZnO nanofibers are fabricated as a result. Owing to the intrinsic intervals between nanofibers, the device is fully transparent on quartz substrate. Various characterization methods including TEM, XRD, and XPS are used to testify the existence form of Ag element in ZnO nanofibers, and a field effect transistor is constructed to judge their conductivity. It is discovered that the Ag doping process not only transforms ZnO to p-type conductivity, making it possible to build this self-powered photodetector, but also forms Ag nanoparticles in ZnO nanofibers and thus helps reduce the response time. Benefiting from the abovementioned dual effects, this UV detector is found to have an enhanced performance, with the on-off ratio up to 10 at zero bias and a rather short rise/decay time of 3.90 s/4.71 s.

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Section: Resultsmentioning

confidence: 99%

Novel Transparent and Self‐Powered UV Photodetector Based on Crossed ZnO Nanofiber Array Homojunction

Zhang

Teng

et al. 2018

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347

183

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“…[17] Among all of the material compositions, the GrF-ZnTs/UNCD nanohybrids reveal I NBE /I DLE ratio of 61.2, which higher than other best samples such as ZnTs, ZnTs/GrF, and ZnTs/UNCD are 34.3, 38.9, and 46.7, respectively. Figure 5a-d shows the PL spectra, which acquired strong and sharp emission peaks at a 385 nm excitation and inferior peak around 620 nm, which is corresponding to deep level emission (DLE) or O 2 -related detection.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 88%

Structural Engineering of Dispersed Graphene Flakes into ZnO Nanotubes on Discontinues Ultra‐Nanocrystalline Diamond Substrates for High‐Performance Photodetector with Excellent UV Light to Dark Current Ratios

Huang

Saravanan

2019

Adv Materials Inter

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In this work, ultraviolet (UV) photodetectors based on ultra‐nanocrystalline diamond (UNCD) and dispersed graphene flakes (GrF) with ZnO nanotubes (ZnTs) heterostructures are investigated. Unique hybrid nanostructure of dispersed GrF into ZnTs on discontinuous UNCD substrates using scalable techniques is presented. It is revealed from microstructural analysis that the addition of GrF into highly uniform ZnTs grown on UNCD substrates results outstanding UV photodetection properties. Thus, the GrF‐ZnTs/UNCD nanostructure reveals superior UV diode performance, with an ultrahigh UV switching ratio of 19 708 at 5 V, which is excellently better than those of ZnO nanostructures. It is perceived that the perfect distribution of GrF into ZnTs on UNCD substrates results in ultrafast electron–hole recombination. The distribution of GrF and UNCD interlayer enables the new energy levels on the conduction band, which reduces the barrier height to allow fast charge carrier transportation during the UV illumination. It is believed that the addition of GrFs and UNCD layer increase the UV adsorptivity and sufficient amount of conducting path within ZnTs. Therefore, the present GrF‐ZnTs/UNCD photodetector can be used as an efficient UV photodetection device with high performance and opening up new opportunities for future optoelectronic devices.

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“…To understand the carbon and nitrogen doping from CNT and SFP into ZnO, the possible schematics and band models of CNT with ZnO (without the addition of SFP) and SFP with ZnO (without the addition of CNT) is discussed in the supporting information (Figure S9), respectively. The general photodetection mechanism can be ascribed to the present bio‐nanosheets based photodetectors, however the properties of the SFP influenced the performance of the 0.3 g ZFP CNT photodetector under different types of light. In a dark atmosphere, the oxygen molecules extract electrons from the conduction band leading to the formation of oxygen species (O − ) on the surface of the 0.3 g ZFP CNT materials, which certainly increases the width of the depletion region and reduces the conductivity (Figure c).…”

Section: Discussionmentioning

confidence: 99%

“…ZnO:Cu/n-ZnO NRs [25] 6.1 0.2 10 --ZnO NRs/CdS [26] 2800 -2-p-ZnO/n-ZnO-Au NRs [27] 1168 61 0--ZnO NRs/Graphene [28] 2.8 -10 10 18…”

Section: -15mentioning

confidence: 99%

Bio‐industrial Waste Silk Fibroin Protein and Carbon Nanotube‐Induced Carbonized Growth of One‐Dimensional ZnO‐based Bio‐nanosheets and their Enhanced Optoelectronic Properties

Saravanan

Huang

Kathiravan

2018

Chemistry A European J

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High performance UV/Visible photodetectors are successfully fabricated from ZnO/fibroin protein-carbon nanotube (ZFP ) composites using a simple hydrothermal method. The as-fabricated ZnO nanorods (ZnO NRs) and ZFP nanostructures were measured under different light illuminations. The measurements showed the UV-light photoresponse of the as-fabricated ZFP nanostructures (55,555) to be approximately 26454 % higher than that of the as-prepared ZnO NRs (210). This photodetector can sense photons with energies considerably smaller (2.75 eV) than the band gap of ZnO (3.22 eV). It was observed that the finest distribution of fibroin and CNT into 1D ZnO resulted in rapid electron transportation and hole recombination via carbon/nitrogen dopants from the ZFP . Carbon dopants create new energy levels on the conduction band of the ZFP , which reduces the barrier height to allow for charge carrier transportation under light illumination. Moreover, the nitrogen dopants increase the adsorptivity and amount of oxygen vacancies in the ZFP so that it exhibits fast response/recovery times both in the dark and under light illumination. The selectivity of UV light among the other types of illumination can be ascribed to the deep-level energy traps (E ) of the ZFP . These significant features of ZFP lead to the excellent optical properties and creation of new pathways for the production of low-cost semiconductors and bio-waste protein based UV/Visible photodetectors.

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Tunable UV- and Visible-Light Photoresponse Based on p-ZnO Nanostructures/n-ZnO/Glass Peppered with Au Nanoparticles

Cited by 58 publications

References 28 publications

Novel Transparent and Self‐Powered UV Photodetector Based on Crossed ZnO Nanofiber Array Homojunction

Novel Transparent and Self‐Powered UV Photodetector Based on Crossed ZnO Nanofiber Array Homojunction

Structural Engineering of Dispersed Graphene Flakes into ZnO Nanotubes on Discontinues Ultra‐Nanocrystalline Diamond Substrates for High‐Performance Photodetector with Excellent UV Light to Dark Current Ratios

Bio‐industrial Waste Silk Fibroin Protein and Carbon Nanotube‐Induced Carbonized Growth of One‐Dimensional ZnO‐based Bio‐nanosheets and their Enhanced Optoelectronic Properties

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