Giant enhancement of top emission from ZnO thin film by nanopatterned Pt

Liu, K. W.; Tang, Yuanyuan; Sum, Tze Chien; Huan, C. H. A.; Shen, Zexiang; Wang, Li; Jiang, Fengyi; Sun, Xiaowei; Sun, Handong

doi:10.1063/1.3116617

Cited by 107 publications

(40 citation statements)

References 15 publications

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“…12 In many studies of ZnO/metal structures near-UV emission was enhanced while visible emission was suppressed, because the SPP resonance was close to the bandgap energy of ZnO. [6][7][8] In periodic grating structures, various SPP modes can be excited depending on the periodicity and the properties of the constituent materials. 9 Influences of such multiple SPP-mode excitation on the optical properties of ZnO have not been explicitly investigated.…”

Section: Introductionmentioning

confidence: 98%

“…[9][10][11] It has been reported that SPPs at the ZnO/metal interface can enhance the spontaneous electron-hole recombination rate and subsequent photoluminescence (PL) intensity. [5][6][7][8] ZnO thin films usually show broad visible-range PL, originated from defect states, as well as the near band-edge UV emission. 12 In many studies of ZnO/metal structures near-UV emission was enhanced while visible emission was suppressed, because the SPP resonance was close to the bandgap energy of ZnO.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] SPPs also provide the possibility of guiding light in subwavelength metallic structures. [1][2][3][4][5][6][7][8] Thus, the SPPs have attracted considerable research attention due to scientific interest and applications in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

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Surface-plasmon-enhanced visible light emission of ZnO/Ag grating structures

et al. 2011

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We investigated the optical properties of ZnO/Ag grating structures, with the periods of 1000 and 1400 nm, fabricated by sputtering and nanoimprint lithography. The grating structures exhibited multiple peak features in visible-range photoluminescence (PL) spectra. Whereas a ZnO/Ag planar thin film showed two broad PL peaks in UV and visible region. Moreover, the PL intensity of the periodic structures was ~100 times larger than that of the planar counterpart. Several reflectance dips in the visible range were seen only in the grating structures, which could be caused by photoninduced surface plasmon polariton (SPP) excitation via the grating coupling. The PL peaks well matched with the reflectance dips. This represented that the PL enhancement should be originated from the SPP excitation. The finitedifference time-domain simulations also supported the plasmonic effects in the periodic structures.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Surface-plasmon-enhanced visible light emission of ZnO/Ag grating structures

et al. 2011

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“…Such SP-mediated emission has recently been demonstrated in ZnO nanostructures coated by various metals (Ag, Au, Ti, Al and Pt) and dramatic enhancement of the NBE emission was observed [8][9][10][11][12]. It should also be possible to realize the SP-exciton coupling in TM capped ZnO NWs as TMs support SP modes at their surfaces.…”

Section: Introduction Imentioning

confidence: 99%

Evidence for coupling between exciton emissions and surface plasmon in Ni-coated ZnO nanowires

Ren¹,

Filippov²,

Chen³

et al. 2012

Nanotechnology

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We show that coating ZnO nanowires (NWs) with a transition metal, such as Ni, can increase efficiency of light emission at room temperature. Based on detailed structural and optical studies, this enhancement is attributed to energy transfer between near-band-edge emission in ZnO and surface plasmons in the Ni film which leads to an increased rate of the spontaneous emission. It is also shown that the Ni coating leads to an enhanced non-radiative recombination via surface states, which becomes increasingly important at low measurement temperatures and in annealed ZnO/Ni NWs.

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“…73 Surface defects of ZnO play a major role in determining s R and s NR . In our previous section we have shown the passivation of surface defect with KMnO 4 addition in the precursor solution, therefore we have observed a feeble DLE suggesting higher radiative recombination rate.…”

mentioning

confidence: 99%

Insights into non-noble metal based nanophotonics: exploration of Cr-coated ZnO nanorods for optoelectronic applications

2018

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Herein, the room temperature photoluminescence and Raman spectra of hydrothermally grown ZnO nanorods coated with Cr are investigated for optoelectronic applications. A thorough examination of the photoluminescence spectra of Cr coated ZnO nanorods showed the suppression of deep level emissions by more than twenty five times with Cr coating compared to that of pristine ZnO nanorods. Moreover, the underlying mechanism was proposed and can be attributed to the formation of Schottky contacts between Cr and ZnO resulting in defect passivation, weak exciton-plasmon coupling, enhanced electric field effect and formation of hot carriers due to interband transitions. Interestingly, with the increase in sputtering time, the ratio of the intensities corresponding to the band gap emission and deep level emission was observed to increase from 6.2 to 42.7, suggesting its application for UV only emission.Further, a planar photodetector was fabricated (Ag-ZnO-Ag planar configuration) and it was observed that the dark current value got reduced by more than ten times with Cr coating, thereby opening up its potential for transistor applications. Finally, Cr coated ZnO nanorods were employed for green light sensing. Our results demonstrated that ZnO nanorods decorated with Cr shed light on developing stable and high-efficiency non-noble metal based nanoplasmonic devices such as photodetectors, phototransistors and solar cells.

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Giant enhancement of top emission from ZnO thin film by nanopatterned Pt

Cited by 107 publications

References 15 publications

Surface-plasmon-enhanced visible light emission of ZnO/Ag grating structures

Surface-plasmon-enhanced visible light emission of ZnO/Ag grating structures

Evidence for coupling between exciton emissions and surface plasmon in Ni-coated ZnO nanowires

Insights into non-noble metal based nanophotonics: exploration of Cr-coated ZnO nanorods for optoelectronic applications

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