Blueshift of absorption edge and photoluminescence in Al doped ZnO thin films

Liu, Wenlong; Zhang, Yun Feng

doi:10.1080/10584587.2018.1454222

Cited by 22 publications

(7 citation statements)

References 38 publications

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“…Moreover, all films shows a strong absorption in the ultraviolet region of 300-400 nm, which is attributed to the intrinsic absorption originated from the direct transition of electrons [26]. It can also be noted that the absorption edge of the films shifts to the short-wavelength direction after doped, which is in agreement with that reported in the literature [27,28]. This might be attributed to the reduction of surface roughness [29], which is accordant with the result of SEM observation.…”

Section: Optical Propertysupporting

confidence: 90%

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

et al. 2021

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In this research, Al-doped and (Al, Fe) codoped ZnO films were prepared on glass substrate by the sol–gel method. The surface morphology, structure, and optical property were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Ultraviolet-Visible-Near-infrared (UV-Vis-NIR) spectroscopy. The film surface morphologies all exhibited granular characteristics. With the Fe doping concentration increasing, the codoped films had smaller grain size and tended to be smoother. XRD analysis revealed that all films had a hexagonal wurtzite structure. The codoping can contribute to more Al and Fe ions entering the ZnO crystal structure, but result in the crystalline degree of the films decreasing. XPS results showed that the Al and Fe irons in the films exist in the form of trivalent. Moreover, the doped films had higher transmission, especially for codoped (Fe:Al = 3) film, but their absorption edge shifted to the short-wavelength direction.

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Section: Optical Propertysupporting

confidence: 90%

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

et al. 2021

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“…Generally, the blueshift in thin film materials may be associated with the Burstein−Moss effect. 53 The dependence of absorption coefficient and extinction coefficient on annealing temperature is plotted in Figures 7a,b, respectively, which show the dependence of absorption and extinction coefficients on wavelength λ of incident light. The observed variations in the extinction coefficient for the higher energies may be due to the band-to-band transition of charge carriers.…”

Section: Resultsmentioning

confidence: 99%

“…The study revealed that the absorption edge is shifted at higher values of incident light energies (i.e., a blueshift is observed). Generally, the blueshift in thin film materials may be associated with the Burstein–Moss effect . The dependence of absorption coefficient and extinction coefficient on annealing temperature is plotted in Figures a,b, respectively, which show the dependence of absorption and extinction coefficients on wavelength λ of incident light.…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis and Characterization of High-Efficiency Halide Perovskite Nanomaterials for Light-Absorbing Applications

Faridi

Imran

Tariq

et al. 2022

Ind. Eng. Chem. Res.

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Inorganic perovskite materials are possible candidates for conversion of solar energy to electrical energy due to their high absorption coefficient. Perovskite solar cells (PSCs) introduced a new type of device structure that has attention due to better efficiencies and interest in PSCs that has been increasing in recent years. Halide perovskite materials such as CsPbIBr2 show remarkable optical and structural performance with their better physical properties. Perovskite solar cells are a possible candidate to replace conventional silicon solar panels. In the present study, CsPbIBr2 perovskite materials’ thin films were prepared for light-absorbing application. Five thin films were deposited on the glass substrates by subsequent spin-coating of CsI and PbBr2 solutions, subsequently annealed at different temperature values (as-deposited, 100, 150, 200 and 250 °C) to get CsPbIBr2 thin films with a better crystal structure. Structural characterizations were made by using X-ray diffraction. CsPbIBr2 thin films were found to be polycrystalline in nature. With increasing annealing temperature, the crystallinity was improved, and the crystalline size was increased. Optical properties were studied by using transmission data, and by increasing annealing temperature, a small variation in optical band gap energy was observed in the range of 1.70–1.83 eV. The conductivity of CsPbIBr2 thin films was determined by a hot probe technique and was found to have little fluctuating response toward p-type conductivity, which may be due to intrinsic defects or presence of CsI phase, but a stable intrinsic nature was observed. The obtained physical properties of CsPbIBr2 thin films suggest them as a suitable candidate as a light-harvesting layer. These thin films could be an especially good partner with Si or other lower band gap energy materials in tandem solar cells (TSC). CsPbIBr2 material will harvest light having energy of ∼1.7 eV or higher, while a lower energy part of the solar spectrum will be absorbed in the partner part of the TSC.

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“…The FD20 that has the lowest agglomeration has the lowest band gap value. Furthermore, another study reported that the band gap is also affected by the Burstein-Moss effect, where the Fermi level moves to the conduction band to increase the band gap [56]. The performance of Fe 3 O 4 /MWCNT/ZnO nanocomposites with diethylamine as an antibacterial agent was evaluated considering the diameter of the inhibition zones.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of Fe₃O₄/MWCNT/ZnO nanocomposites covered by a soft template as a new antibacterial agent

Subadra¹,

Taufiq²,

Sunaryono³

et al. 2022

Adv. Nat. Sci: Nanosci. Nanotechnol.

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This study successfully developed a new antibacterial agent based on Fe3O4/MWCNT/ZnO nanocomposites prepared using diethylamine as a soft template. The prepared samples were characterised using x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive x-ray spectroscopy, vibrating sample magnetometry, ultraviolet-visible spectroscopy, and antibacterial tests by the diffusion method. The results of the data analysis showed that Fe3O4/MWCNT/ZnO nanocomposites were composed of Fe3O4, MWCNT, ZnO with inverse cubic spinel, hexagonal, and hexagonal wurtzite structures, respectively. The nanocomposite particles tended to agglomerate and their size decreased with increasing volume of added diethylamine in the range of ∼23–26 nm. The nanocomposites remain stable even after being stored for more than 3 years. The nanocomposites had superparamagnetic properties with saturation magnetisation values of 24 to 31 emu g−1 and band gap values of 2.96 to 2.99 eV. The diameters of the bacterial inhibition zone of the nanocomposites were 12.57–20.38 mm, 14.25–17.25 mm, and 14.63–16.38 mm against E. coli, S. aureus, and B. subtilis, respectively. Therefore, the combination of Fe3O4, MWCNT, ZnO, and diethylamine with natural base materials such as iron sand has good potential to develop new antibacterial agents.

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Blueshift of absorption edge and photoluminescence in Al doped ZnO thin films

Cited by 22 publications

References 38 publications

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

Synthesis and Characterization of High-Efficiency Halide Perovskite Nanomaterials for Light-Absorbing Applications

Synthesis and characterisation of Fe₃O₄/MWCNT/ZnO nanocomposites covered by a soft template as a new antibacterial agent

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Blueshift of absorption edge and photoluminescence in Al doped ZnO thin films

Cited by 22 publications

References 38 publications

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

Preparation and Characterization of (Al, Fe) Codoped ZnO Films Prepared by Sol–Gel

Synthesis and Characterization of High-Efficiency Halide Perovskite Nanomaterials for Light-Absorbing Applications

Synthesis and characterisation of Fe3O4/MWCNT/ZnO nanocomposites covered by a soft template as a new antibacterial agent

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Synthesis and characterisation of Fe₃O₄/MWCNT/ZnO nanocomposites covered by a soft template as a new antibacterial agent