Role of vacancy defects in Al doped ZnO thin films for optoelectronic devices

Rotella, H.; Mazel, Yann; Brochen, Stéphane; Valla, A.; Pautrat, Alain; Licitra, C.; Rochat, N.; Sabbione, C.; Rodriguez, Guillaume; Nolot, Emmanuel

doi:10.1088/1361-6463/aa920b

Cited by 57 publications

(23 citation statements)

References 35 publications

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“…Hence, it is reasonable to assume that these components correspond to the first (FX-1LO) and the second (FX-2LO) exciton phonon replicas, which usually dominate the UV emission band from Regarding the third component at ∼3.1 eV, the energy differences with respect the FX-2LO component (105 and 116 eV for 1% and 4% of Al 3+ nominal content, respectively) are significantly larger than the ZnO phonon energy, indicating that it is not an additional phonon replica. Indeed, we notice that a component at ∼3.1 eV has been observed before in Al-doped ZnO and attributed to near-edge states associated with Al substitution of Zn[66]. Shallow donor states due to due to Al 3s electrons from substitutional Al in ZnO are predicted by density functional theory based calculations[67].…”

mentioning

confidence: 59%

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Marin

Soliz

Gutierrez

et al. 2019

Journal of Alloys and Compounds

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Powders of ZnO and ZnO:M (M = Al 3+ and Sr 2+) with 1 and 4% of M nominal content were synthetized by a hydrothermal method in a diethanolamine (DEA) medium. The samples were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), micro-Raman and photoluminescence (PL). The powder particles were spherical with average radius decreasing from 1 µm down to 70 nm with increasing Al 3+ nominal content but nearly independent on the Sr 2+ nominal content. The XRD and micro-Raman results indicate that both Al 3+ and Sr 2+ mostly incorporated substitutionally into the ZnO lattice, giving rise to compressive and tensile strain, respectively, as a result of ionic radii differences. The PL spectra for ZnO:Al exhibit a dopant-induced contribution at ∼3.1 eV, which is not observed for ZnO:Sr, due to radiative transitions involving trapping of photocarriers at theoretically expected substitutional Al 3+ donor states or at Zn interstitial defects.

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confidence: 59%

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Marin

Soliz

Gutierrez

et al. 2019

Journal of Alloys and Compounds

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“…Greer et al [15] have employed gelatin as the structure-directing agent to fabricate twinned ZnO NCs. The removal of embedded gelatin in NCs requires calcination at 600 °C, which may in turn impact the physical properties on account of the known role of oxygen vacancies and defects on electron transport behavior of ZnO [26–27]. But in our case no such high temperature processing is required at any stage.…”

Section: Resultsmentioning

confidence: 97%

Site-specific growth of oriented ZnO nanocrystal arrays

Bai

Pandya

Chaudhary

et al. 2019

Beilstein J. Nanotechnol.

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We report on the growth of ZnO nanocrystals having a hexagonal, prismatic shape, sized 700 nm × 600 nm, on bare indium tin oxide (ITO) substrates. The growth is induced by a low ion flux and involves a low-temperature electrodeposition technique. Further, vertically aligned periodic nanocrystal (NC) growth is engineered at predefined positions on polymer-coated ITO substrates patterned with ordered pores. The vertical alignment of ZnO NCs along the c-axis is achieved via ion-by-ion nucleation-controlled growth for patterned pores of size ≈600 nm; however, many-coupled branched NCs with hexagonal shape are formed when a patterned pore size of ≈200 nm is used. X-ray diffraction data is in agreement with the observed morphology. A mechanism is proposed to interpret the observed site-specific oriented/branched growth that is correlated to the pore size. As ordered NC arrays have the potential to generate new collective properties different from single NCs, our first demonstration of a cost effective and facile fabrication process opens up new possibilities for devices with versatile functionalities.

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“…[24] various Al Zn -O i complexes make a strong input to the yellow band at 550 nm. At the same time, the NBE bands of the Al-1 sample show a slight blue shift for doped samples moving the NBE to 370 nm (3.35 eV) [25].…”

Section: Optical Characteristicsmentioning

confidence: 84%

Electrochemical Coprecipitation of Zinc and Aluminum in Aqueous Electrolytes for ZnO and AZO Coverage Deposition

Мартынова

Svishchev

Лепнев

et al. 2019

International Journal of Photoenergy

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The aim of this study is to examine the technological challenge of the electrochemical formation of zinc oxide and Al-doped ZnO films (ZnO:Al, AZO) as transparent conductive oxide coatings with complex architectures for solar cell photoanode materials. A cathodic electrodeposition of AZO was performed using aqueous nitrate electrolytes at 25°C. A significant positive deviation in aluminum percentage in the films was demonstrated by the LAES, EDX, and XPS methods, which originates from aluminum hydroxide sedimentation. The photoluminescent characteristics of the ZnO films reveal low band intensities related to intrinsic defects, while the samples with 1 at.% of aluminum show a strong and wide PL band at 600±80 nm and increase in conductivity.

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Role of vacancy defects in Al doped ZnO thin films for optoelectronic devices

Cited by 57 publications

References 35 publications

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Site-specific growth of oriented ZnO nanocrystal arrays

Electrochemical Coprecipitation of Zinc and Aluminum in Aqueous Electrolytes for ZnO and AZO Coverage Deposition

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