Optical properties of zirconium oxide thin films for semitransparent solar cell applications

Yoon, Hoi Jin; Bang, Ki Su; Lim, Jung Wook; Lee, Seung-Yun

doi:10.1007/s10854-016-5260-4

Cited by 13 publications

(9 citation statements)

References 28 publications

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“…Zirconium oxide (ZrO x ) has gained a large amount of attention in different applications such as thin film transistors (TFT) [1,2], sensors [3,4], display technology [1], and memory technology [5,6] due to its unique thermal stability, optical, and electronic properties. Additionally, in TFT applications, ZrO x has been employed as a plausible replacement for the silicon oxide dielectric layer, owing to its high permittivity (κ) (~25), and wide bandgap (5.1-7.8 eV) [7][8][9]. However, the production of ZrO x dielectrics by a wet chemical process is still slow because of high processing temperature (above 400 • C), arising from the need to decompose the organic moiety from the film's matrix, which in turn increases the thermal budget [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Post-UV/Ozone Treatment of Ultrasonic-Sprayed Zirconium Oxide Dielectric Films for a Low-Temperature Oxide Thin Film Transistor

et al. 2019

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Solution-processed metal oxides require a great deal of thermal budget in order to achieve the desired film properties. Here, we show that the deposition temperature of sprayed zirconium oxide (ZrOx) thin film can be lowered by exposing the film surface to an ultraviolet (UV) ozone treatment at room temperature. Atomic force microscopy reveals a smooth and uniform film with the root mean square roughness reduced from ~ 0.63 nm (UVO-O) to ~ 0.28 nm (UVO-120) in the UV–ozone treated ZrOx films. X-ray photoelectron spectroscopy analysis indicates the formation of a Zr–O network on the surface film, and oxygen vacancy is reduced in the ZrOx lattice by increasing the UV–ozone treatment time. The leakage current density in Al/ZrOx/p-Si structure was reduced by three orders of magnitude by increasing the UV-ozone exposure time, while the capacitance was in the range 290–266 nF/cm2, corresponding to a relative permittivity (k) in the range 5.8–6.6 at 1 kHz. An indium gallium zinc oxide (IGZO)-based thin film transistor, employing a UV-treated ZrOx gate dielectric deposited at 200 °C, exhibits negligible hysteresis, an Ion/Ioff ratio of 104, a saturation mobility of 8.4 cm2 V−1S−1, a subthreshold slope of 0.21 V.dec−1, and a Von of 0.02 V. These results demonstrate the potentiality of low-temperature sprayed amorphous ZrOx to be applied as a dielectric in flexible and low-power-consumption oxide electronics.

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Section: Introductionmentioning

confidence: 99%

Influence of Post-UV/Ozone Treatment of Ultrasonic-Sprayed Zirconium Oxide Dielectric Films for a Low-Temperature Oxide Thin Film Transistor

et al. 2019

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“…It is well known that TiO 2 with a particle size of 400 nm is utilized to prepare the light scattering layer of DSSCs . In the m-DSSCs, ZrO 2 with a particle size of 20–400 nm was utilized to prepare the insulating layer on the surface of the light-scattering TiO 2 layer. ,,, It has been reported that the ZrO 2 layer also has light scattering properties. , Hence, the ZrO 2 layer was used instead of the TiO 2 scattering layer to work simultaneously as a light-scattering and insulating material. The light-scattering effect of the ZrO 2 layers was measured using UV spectroscopy, and the results were compared with those of the TiO 2 layer.…”

Section: Resultsmentioning

confidence: 99%

“…36,38,54,57 It has been reported that the ZrO 2 layer also has light scattering properties. 62,63 Hence, the ZrO 2 layer was used instead of the TiO 2 scattering layer to work simultaneously as a light-scattering and insulating material. The light-scattering effect of the ZrO 2 layers was measured using UV spectroscopy, and the results were compared with those of the TiO 2 layer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Monolithic Quasi-Solid-State Dye Sensitized Solar Cells Prepared Entirely by Printing Processes

Venkatesan

Chiang

Teng

et al. 2023

ACS Sustainable Chem. Eng.

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A complete printing process was developed to fabricate the quasi-solid-state dye-sensitized solar cells with monolithic structures (m-QS-DSSCs). First, a structure of m-DSSCs was constructed by sequentially printing TiO 2 layers (main and scattering), a ZrO 2 insulating layer, and a carbon counter electrode (CE) onto an FTO substrate (FTO/TiO 2 /ZrO 2 /carbon CE). Then, a quasi-solid-state printable electrolyte (QS-PE), prepared using polyethylene oxide/ polymethyl methacrylate, was printed directly on top of the porous carbon counter electrode (CE), enabling the m-QS-DSSCs to be prepared entirely by printing processes. In this study, the porous structures and characteristics of the ZrO 2 and carbon layers were optimized by controlling the film thicknesses and heat treatment conditions; furthermore, the Pt layer was coated to improve the catalytic activity of carbon CEs. The results revealed that an appropriate porous structure of carbon and ZrO 2 films could be obtained by heating the films from 200 to 500 °C. Through these porous layers, the QS-PE can penetrate well into the photoelectrodes, increasing the charge transport in the cells and at the electrode/electrolyte interfaces; therefore, the m-QS-DSSCs can achieve an efficiency of 6.79% under 1 sun illumination. Furthermore, the structures can also be utilized to fabricate liquid cells for application in a dim light environment. The m-QS-DSSCs remained stable during a longterm stability test at room temperature.

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“…In Figure 6 is clearly shown the regions having different wavelength peaks for the PVP + ZnNiFe nano composites and for different ratios of the nanoparticle reinforcement. [18][19][20][21][22][23][24][25] Figure 6 UV-Visible spectroscopy graph for the pure polymer PVP.…”

Section: Fourier Transform Infrared [Ftir] Resultsmentioning

confidence: 99%

Characterization and evaluation of thin films of a polymer reinforced with nanoparticles using the spin coating technique

Melavanki¹,

Siddaraju²,

Shyam³

et al. 2022

MSEIJ

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Thin films of the polymer, polyvinylpyloridate, reinforced with zinc-nickel ferrite nanoparticles (Zn0.5Ni0.5Fe2O4) and prepared using the technique of spin coating is the central theme of presentation and discussion in this research paper. The zinc-nickel ferrite nanoparticles were used to reinforce a thin film of the chosen polymer and for varying concentrations. The prepared thin films were transparent and consequently studied for the purpose of selection and use in applications specific to the domain of photonics. Optical characterization of samples of the as-synthesized thin films was done using different spectroscopy techniques. Optical density of the as-prepared thin films was obtained using a ultra-violet (UV) spectrophotometer. The reinforcing effect was observed from the emission spectra that was obtained using the fluorescence spectrophotometer. Also, Fourier transform infrared spectroscopy (FTIR) of the reinforced thin films of the chosen polymer was obtained and compared with the unreinforced pure polymer and did reveal an observable change in both the peak value and intensity of the peak. X-ray diffraction (XRD) analysis revealed a noticeable difference in both intensity and crystallization of the thin films of the reinforced polymer. Scanning electron microscopy observations revealed a morphological change of the thin films. Roughness of the sample surface was studied with the help of images obtained from an atomic force microscope (AFM). The present research study technique of spin coating was done properly and successfully. With a gradual increase in the number of reinforcing nanoparticles in the polymer matrix we did observe an increase in Optical Density using UV-Visible spectroscopy. An increase in the Optical Density is beneficial for attaining an improvement in anti-reflection response. This study helped establish the effect of nanoparticle reinforcements on optical properties while concurrently establishing the need for selection and use of thin films for applications in the field of photonics.

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Optical properties of zirconium oxide thin films for semitransparent solar cell applications

Cited by 13 publications

References 28 publications

Influence of Post-UV/Ozone Treatment of Ultrasonic-Sprayed Zirconium Oxide Dielectric Films for a Low-Temperature Oxide Thin Film Transistor

Influence of Post-UV/Ozone Treatment of Ultrasonic-Sprayed Zirconium Oxide Dielectric Films for a Low-Temperature Oxide Thin Film Transistor

Monolithic Quasi-Solid-State Dye Sensitized Solar Cells Prepared Entirely by Printing Processes

Characterization and evaluation of thin films of a polymer reinforced with nanoparticles using the spin coating technique

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