Extreme tunability in aluminum doped Zinc Oxide plasmonic materials for near-infrared applications

Pradhan, A. K.; Mundle, R.; Santiago, Kevin; Skuza, J. R.; Xiao, Bo; Song, Kyo D.; Bahoura, M.; Cheaito, Ramez; Hopkins, Patrick E.

doi:10.1038/srep06415

Cited by 107 publications

(78 citation statements)

References 31 publications

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“…Details of the AZO deposition process were reported elsewhere. 20 In the present case, the ratio of the Zn:Al in the ALD cycle was maintained at 30:1, and the corresponding measured atomic concentration of Al was ∼ 3% (See Fig. 1 of Ref.…”

Section: Methodsmentioning

confidence: 68%

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Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications

et al. 2017

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The large mismatch of the coefficients of thermal expansion (CTE) between the metal contact and CdZnTe exerts thermal stress at the metal/CZT interface, which causes mechanical degradation of the contact in addition to the poor adhesion of the metallic thin film to CZT. To form a reliable and stable interface, the contact material should have better adhesion and a close match of the coefficients of thermal expansion with CZT/CdTe. Here, we report on our investigations of a novel non-metallic contact layer for use in radiation detector applications. The proposed ZnO:Al contact layer offers better adhesion due to the oxide interface, higher hardness and better matching of the CTE with CZT. It has high prospects for a reliable and stable device structure that can serve as a replacement to the common metallic electrodes used today. We evaluated AZO contacts to CZT and extracted the electronic characteristics, such as resistivity and mobility-lifetime product of electrons, and compared the results of the same characterization measurements for CZT with gold contacts. The present observations showed that the characteristics of CZT detectors with AZO contacts are nearly identical to the same detectors with gold contacts.

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Section: Methodsmentioning

confidence: 68%

“…1 of Ref. 20). During this deposition, the temperature was maintained at 85-90 0 C. The thickness and the resistivity of the AZO film were 2500 Å and ∼4 x10 -2 ohm-cm, respectively.…”

Section: Methodsmentioning

confidence: 99%

Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications

et al. 2017

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“…The carrier concentration of AZO has been shown to be electrically tunable or thermally tunable via voltage biasing [39,40]. This change in carrier concentration is seen as a change in plasma frequency for AZO that effects the value of its permittivity Figure 4.…”

Section: Tunable Tla In Azomentioning

confidence: 99%

“…The optical properties of plasmonic and optical devices in semiconductors and transparent metal oxides can be tuned by altering their carrier concentration through voltages or heat [20,[32][33][34][35][36][37][38][39][40][41]. Very recently, indium tin oxide (ITO) and Ga-doped ZnO have been used to realize tunable TLA [33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, indium tin oxide (ITO) and Ga-doped ZnO have been used to realize tunable TLA [33][34][35][36][37][38][39][40][41]. From the material side, ITO and Ga or Al-doped ZnO (AZO)-based transparent metal oxide exhibits tunable optical properties that can be thermally, electrically, or optically switched [33][34][35][36][37][38][39][40][41], and is compatible with standard complementary metal-oxide-semiconductor (CMOS) fabrication and integration procedures [40,42]. Furthermore, TLA can also be achieved near the epsilon-near-zero regime in ITO [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Coupling of Surface Plasmon Polariton in Al-Doped ZnO with Fabry-Pérot Resonance for Total Light Absorption

et al. 2017

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Al-doped ZnO (AZO) can be used as an electrically tunable plasmonic material in the near infrared range. This paper presents finite-difference time-domain (FDTD) simulations on total light absorption (TLA) resulting from the coupling of a surface plasmon polariton (SPP) with Fabry-Pérot (F-P) resonance in a three-layer structure consisting of an AZO square lattice hole array, a spacer, and a layer of silver. Firstly, we identified that the surface plasmon polariton (SPP) that will couple to the F-P resonance because of an SPP standing wave in the (1,0) direction of the square lattice. Two types of coupling between SPP and F-P resonance are observed in the simulations. In order to achieve TLA, an increase in the refractive index of the spacer material leads to a decrease in the thickness of the spacer. Additionally, it is shown that the replacement of silver by other, more cost-effective metals has no significance influence on the TLA condition. It is observed in the simulations that post-fabrication tunability of the TLA wavelength is possible via the electrical tunability of the AZO. Finally, electric field intensity distributions at specific wavelengths are computed to further prove the coupling of SPP with F-P resonance. This work will contribute to the design principle for future device fabrication for TLA applications.

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Electro‐optics

2019

Crystal Optics

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Extreme tunability in aluminum doped Zinc Oxide plasmonic materials for near-infrared applications

Cited by 107 publications

References 31 publications

Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications

Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications

Coupling of Surface Plasmon Polariton in Al-Doped ZnO with Fabry-Pérot Resonance for Total Light Absorption

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