Evidence for low density of nonradiative defects in ZnO nanowires grown by metal organic vapor-phase epitaxy

Robin, I. C.; Gauron, B.; Ferret, P.; Tavarès, C.; Feuillet, G.; Dang, Le Si; Gayral, B.; Gérard, J. M.

doi:10.1063/1.2794790

Cited by 45 publications

(36 citation statements)

References 13 publications

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“…As shown in Fig. 8, decay time constant of ZNRs and ZNTs first decreases with temperature until 100-150 K and then slightly increases when the temperature further increases up to 300 K. This behavior is similar to the results obtained by Robin et al, 56 which can be explained by a thermal quenching of the nonradiative recombination due to a limited number of nonradiative defects. As increasing the temperature below 150 K, the donor bound excitons are thermalized into free carriers or FXs gradually, which enlarge the carrier quantity trapped by the nonradiative centers.…”

Section: Resultssupporting

confidence: 79%

Indirect optical transition due to surface band bending in ZnO nanotubes

Yang

Zhao

Israr

et al. 2010

Journal of Applied Physics

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ZnO nanotubes ͑ZNTs͒ have been successfully evolved from ZnO nanorods ͑ZNRs͒ by a simple chemical etching process. Two peaks located at 382 and 384 nm in the UV emission region has been observed in the room temperature photoluminescence ͑PL͒ spectrum of ZNTs since the surface band bending in ZNTs induces the coexistence of indirect and direct transitions in their emission process. In addition, a strong enhancement of total luminescence intensity at room temperature in ZNTs has also be observed in comparison with that of ZNRs. Both temperature-dependent PL and time-resolved PL results not only further testify the coexistence of indirect and direct transitions due to the surface band bending but also reveal that less nonradiative contribution to the emission process in ZNTs finally causes their stronger luminescence intensity.

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Section: Resultssupporting

confidence: 79%

Indirect optical transition due to surface band bending in ZnO nanotubes

Yang

Zhao

Israr

et al. 2010

Journal of Applied Physics

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“…[22][23][24] However, the investigations by low temperature time resolved PL spectroscopy of ZnO nanorods are limited. 25,26 One of the significant differences between nanorods and an epilayer is the larger surface area of the former. This large surface area can be an advantage for some applications, for example, sensor devices.…”

Section: Introductionmentioning

confidence: 99%

Surface recombination in ZnO nanorods grown by chemical bath deposition

Zhao¹,

Yang²,

Willander³

et al. 2008

Journal of Applied Physics

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Vertically well-aligned ZnO nanorods on Si substrates were prepared by a two-step chemical bath deposition ͑CBD͒ method. The optical properties of the grown ZnO nanorods were investigated by time resolved photoluminescence spectroscopy. It was found that the effective decay time of the near bandgap recombination in the CBD grown ZnO nanorods strongly depends on the diameter of the ZnO nanorods. Typically, the decay curves obtained from these ZnO nanorods show a combination of two exponential decays. The experimental results show that the fast exponential decay is related to the surface recombination and the slow decay is related to the "bulk" decay. The measured decay time of the effective surface recombination decreases with decreasing diameter, while the bulk decay time remains unchanged. The results also show that an annealing treatment around 500°C significantly reduces the surface recombination rate. A simple carrier and exciton diffusion equation is also used to determine the surface recombination velocity, which results in a value between 1.5 and 4.5 nm/ps.

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“…Due to large lateral surfaces, which facilitate efficient strain relaxation, ZnO NWs and other nanostructures can be grown with a low defect density [1] on a vast variety of substrates. The high material quality combined with a wide and direct band gap, large exciton binding energy, and ability to control their nucleation sites, makes NWs attractive for applications in optoelectronic devices such as ultraviolet lasers [2], light emitting diodes [3] as well as for white lighting.…”

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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Evidence for low density of nonradiative defects in ZnO nanowires grown by metal organic vapor-phase epitaxy

Abstract: 3 pagesInternational audienc

Cited by 45 publications

References 13 publications

Indirect optical transition due to surface band bending in ZnO nanotubes

Indirect optical transition due to surface band bending in ZnO nanotubes

Surface recombination in ZnO nanorods grown by chemical bath deposition

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

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