Influence of Al doping on the crystal structure, optical properties, and photodetecting performance of ZnO film

Azizah, Ni'matul; Muhammady, Shibghatullah; Purbayanto, Muhammad Abiyyu Kenichi; Nurfani, Eka; Winata, Toto; Sustini, Euis; Widita, Rena; Darma, Yudi

doi:10.1016/j.pnsc.2020.01.006

Cited by 60 publications

(15 citation statements)

References 50 publications

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“…Under illumination, the higher current was measured relative to the dark for both films due to the additional carriers generated under illumination. The observed trend at the dark and under illumination like to those reported for the ZnO film deposited using DC-unbalanced magnetron sputtering (DC-UBMS) with silver as the metal contact measured under UV light irradiation [28]. Furthermore, the enhancement of the photocurrent with the presence of dye is higher than that without dye because dye absorbs visible light while ZnO only absorbs only UV light under irradiance of solar simulator, so the visible light-excited carriers in dye are then transferred to the conduction band of ZnO.…”

Section: Resultssupporting

confidence: 81%

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Diguna¹,

Fitriani²,

Liasari

et al. 2020

Crystals

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In this study, we report the synthesis of ZnO nanoparticles from Zn dross via hydrometallurgical method by using acetic acid as a leaching agent. D205 dye molecules were then adsorbed onto Zn dross originated ZnO nanoparticle film. The optical absorption confirms the photosensitization of the synthesized ZnO nanoparticles with dye. The photoluminescence spectra reveal the excitonic- and defect-related emission of ZnO nanoparticles. Compared to ZnO nanoparticles only, the longer emission lifetime of ZnO nanoparticles with adsorbed dye indicates the transfer of photoexcited electrons from dye to the ZnO nanoparticles. Furthermore, photodetection characterization of ZnO film show the enhanced current density with the presence of dye under simulated solar illumination, while that measured at dark is similar in both films with and without dye. This result confirms the potentiality of Zn dross to be recycled into valuable ZnO nanoparticles particularly for the applications in the visible light region, especially for sensing.

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Section: Resultssupporting

confidence: 81%

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Diguna¹,

Fitriani²,

Liasari

et al. 2020

Crystals

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“…On the other hand, the other blue emission at ∼2.77 eV (447.75 nm) was assigned to the ionized zinc interstitial (Zn i − ). 132,133,137 Furthermore, the blue emission at ∼2.89 eV (428.1 nm) and the violet emission at ∼3.01 eV (411.7 nm), which were respectively attributed to the electronic transition signature from Zn i to V Zn states 138,139 and an interstitial zinc vacancy (Zn i ), 132,140,141 were observed for the ZnO nanoparticles calcined at 400 and 600 °C. The blue-green band component of the emission at around 2.55− 2.57 eV (∼485−482 nm), which is generally associated with different surface-related defects such as oxygen vacancies or zinc interstitials, 142,143 was also considered, and it was found only to be present for samples calcined at 400, 600, and 700 °C.…”

Section: Resultsmentioning

confidence: 95%

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

et al. 2021

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Defect influences on the photoactivity of ZnO nanoparticles prepared by a powdered coconut water (ACP) assisted synthesis have been studied. The crystalline phase and morphology of ZnO nanoparticles were effectively controlled by adjusting the calcination temperature (400−700 °C). An induced transition of hybrid Zn 5 (CO 3 ) 2 (OH) 6 /ZnO nanoparticles to single-phase ZnO nanoparticles was obtained at 480 °C. The morphological analysis revealed a formation of ZnO nanoparticles with semispherical (∼6.5 nm)-and rod-like (∼96 nm) shapes when the calcination temperatures were 400 and 700 °C, respectively. Photoluminescence characterizations revealed several defects types in the samples with V Zn and V O + being in the selfassembly of semispherical-and rod-like ZnO nanoparticles. The photocatalytic activity of the ZnO nanoparticles was examined by assessing the degradation of methylene blue in an aqueous solution under low-intensity visible-light irradiation (∼3 W m −2 ). The results point toward the self-assembly of semispherical-and rod-like ZnO nanoparticles that had significantly better photocatalytic activity (∼31%) in comparison to that of spherical-agglomerated-or near-spherical-like species within 120 min of irradiation. The possible photocatalytic mechanism is discussed in detail, and the morphology-driven intrinsic [V Zn +V O + ] defects are proposed to be among the active sites of the ZnO nanoparticles enhancing the photocatalytic activity.

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“…The electron concentration of the ZnO:Al thin film was higher than that of the pristine ZnO thin film. Moreover, the electron concentrations of the extrinsically doped thin films were higher than that of the undoped ZnO thin film due to the presence of shallow, effective-masslike donors and the increase in the oxygen vacancy concentration [27,28]. The decrease in electrical resistivity was attributed to the increase in the electron concentration.…”

Section: Resultsmentioning

confidence: 98%

“…Since extrinsic dopants of Al and B have higher valences and smaller ionic radii than those of the host cation of Zn, extrinsic dopants substitute into host cation sites would create a free electron [29]. In addition, each Al 3+ and B 3+ ion is bound with O 2− ions and provides one excess electron, leading to an increase of electron concentration and pushing the Fermi energy level (E F ) shift toward the conduction band (CB) [28]. Measured results showed that the electron concentration rose from 6.51 × 10 14 cm −3 to 1.55 × 10 15 cm −3 in the ZnO:Al thin film doped with 1% B.…”

Section: Resultsmentioning

confidence: 99%

Melioration of Electrical and Optical Properties of Al and B Co-Doped ZnO Transparent Semiconductor Thin Films

Tsay

2021

Coatings

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Undoped, Al-doped and Al-B co-doped ZnO transparent semiconductor thin films were deposited on glass substrates by sol-gel method and spin coating technique. This study investigated the influence of Al (2 at.%) doping and Al (2 at.%)-B (1 or 2 at.%) co-doping on the microstructural, surface morphological, electrical and optical properties of the ZnO-based thin films. XRD analysis indicated that all as-prepared ZnO-based thin films were polycrystalline with a single-phase hexagonal wurtzite structure. The substitution of extrinsic dopants (Al or Al-B) into ZnO thin films can significantly degrade the crystallinity, refine the microstructures, improve surface flatness, enhance the optical transparency in the visible spectrum and lead to a shift in the absorption edge toward the short-wavelength direction. Experimental results showed that the Al-doped and Al-B co-doped ZnO thin films exhibited high average transmittance (>91.3%) and low average reflectance (<10%) in the visible region compared with the ZnO thin film. The optical parameters, including the optical bandgap, Urbach energy, extinction coefficient and refractive index, changed with the extrinsic doping level. Measured results of electrical properties revealed that the singly doped and co-doped samples exhibited higher electron concentrations and lower resistivities than those of the undoped sample and suggested that 2 at.% Al and 1 at.% B were the optimum dopant concentrations for achieving the best electrical properties in this study.

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Influence of Al doping on the crystal structure, optical properties, and photodetecting performance of ZnO film

Cited by 60 publications

References 50 publications

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

Melioration of Electrical and Optical Properties of Al and B Co-Doped ZnO Transparent Semiconductor Thin Films

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Influence of Al doping on the crystal structure, optical properties, and photodetecting performance of ZnO film

Cited by 60 publications

References 50 publications

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Optical and Photodetection Properties of ZnO Nanoparticles Recovered from Zn Dross

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [VZn+VO+] Defects in Self-Assembled ZnO Nanoparticles

Melioration of Electrical and Optical Properties of Al and B Co-Doped ZnO Transparent Semiconductor Thin Films

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Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles