Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating

Lu, Hai; Huang, Meng; Shen, Kesheng; Zhang, Jun; Xia, Shiqiang; Dong, Chao; Xiong, Zong-Gang; Zhu, Ting; Wu, Dapeng; Zhang, Bo; Zhang, Xianzhou

doi:10.1186/s11671-018-2763-3

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…The high refractive index of TiO 2 provides this composite dielectric with a diffuse reflecting property, as reported in a number of previous publications. 27,28 The cumulated luminance of the bifacial devices reaches 61 cd/m 2 at 100 V, 500 Hz. The relatively high diffuse reflectance of the dielectric and EL film severely limits the specular transparency of the bifacial devices, which appear to be rather hazy translucent (Figure S3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Bifacial Color-Tunable Electroluminescent Devices

Gahlmann

Tschorn²,

Maschwitz

et al. 2021

ACS Appl. Mater. Interfaces

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Alternate current electroluminescent (ACEL) devices provide a range of interesting properties, such as facile large-area processability, mechanical flexibility, and outstanding resilience, when compared with other large-area light-emitting technologies. To widen the scope of possible applications for ACEL devices, color tunability and white light emission are desirable. Here, we introduce a novel three-terminal device architecture based on two monolithically stacked ACEL devices (e.g., orange and blue) that allows for color tunability via independent operation of the subdevices. The tandem devices comprise semitransparent bottom and top electrodes based on networks of silver nanowires, which endow the tandem ACEL device with bifacial Janus-type emission. We provide a detailed analysis of the sources of optical losses in single and tandem ACEL devices. Our novel device concept enables novel facets of applications for ACEL in signage and lighting.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Bifacial Color-Tunable Electroluminescent Devices

Gahlmann

Tschorn²,

Maschwitz

et al. 2021

ACS Appl. Mater. Interfaces

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“…This behavior could be due to the specular reflectance, which could be higher in this case because of the poor crystallization of zinc oxide. However, based on the XRD data, light absorption due to the presence of different vanadium compounds and/or to the presence of the organic precursor cannot be neglected either [ 53 , 54 ]. Increasing the thermal treatment temperature led to obtaining the characteristic spectra of ZnO.…”

Section: Resultsmentioning

confidence: 99%

Effect of Thermal Treatment on the Structure and Morphology of Vanadium Doped ZnO Nanostructures Obtained by Microwave Assisted Sol–Gel Method

Vladut

Mocioiu

Preda

et al. 2022

Gels

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In this paper, we conducted a fundamental study concerning the effect of thermal treatment on the structure and morphology of 2 mol% vanadium doped ZnO nanopowders obtained by microwave assisted sol–gel method (MW). The samples were analyzed by DTA, FTIR, XRD, SEM, and UV–Vis spectroscopy. The DTA results showed that above 500 °C, there was no mass loss in the TG curves, and ZnO crystallization occurred. The XRD patterns of the thermally treated powders at 500 °C and 650 °C showed the crystallization of ZnO (zincite) belonging to the wurtzite-type structure. It was found that in the 650 °C thermally treated powder, aside from ZnO, traces of Zn3(VO4)2 existed. FTIR spectra of the annealed samples confirmed the formation of the ZnO crystalline phase and V–O bands. The micrographs revealed that the temperature influenced the morphology. The increase in the annealing temperature led to the grain growth. The SEM images of the MW powder thermally treated at 650 °C showed two types of grains: hexagonal grains and cylindrical nanorods. UV–Vis spectra showed that the absorption band also increased with the increasing temperature of thermal treatment. The MW sample annealed at 650 °C had the highest absorption in ultraviolet domain.

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“…The particle size of ~300 nm measured by TEM and DLS is reported to produce Mie scattering of light in the visible range [22,[39][40][41]. Moreover, the spheroidal morphology and geometrical irregularities on the particle surface amplify backward scattering [42][43][44]. The large specific surface area as calculated by the BET method exceeds 1100 m 2 /g, while the pore size distribution calculated by the DFT method indicates a uniform average of pores.…”

Section: Discussionmentioning

confidence: 96%

Enhancing Light Harvesting in Dye-Sensitized Solar Cells through Mesoporous Silica Nanoparticle-Mediated Diffuse Scattering Back Reflectors

Fina,

Kaur,

Chang

et al. 2023

Electronic Materials

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Dye-sensitized solar cells (DSSCs) hold unique promise in solar photovoltaics owing to their low-cost fabrication and high efficiency in ambient conditions. However, to improve their commercial viability, effective, and low-cost methods must be employed to enhance their light harvesting capabilities, and hence photovoltaic (PV) performance. Improving the absorption of incoming light is a critical strategy for maximizing solar cell efficiency while overcoming material limitations. Mesoporous silica nanoparticles (MSNs) were employed herein as a reflective layer on the back of transparent counter electrodes. Chemically synthesized MSNs were applied to DSSCs via bar coating as a facile fabrication step compatible with roll-to-roll manufacturing. The MSNs diffusely scatter the unused incident light transmitted through the DSSCs back into the photoactive layers, increasing the absorption of light by N719 dye molecules. This resulted in a 20% increase in power conversion efficiency (PCE), from 5.57% in a standard cell to 6.68% with the addition of MSNs. The improved performance is attributed to an increase in photon absorption which led to the generation of a higher number of charge carriers, thus increasing the current density in DSSCs. These results were corroborated with electrochemical impedance spectroscopy (EIS), which showed improved charge transport kinetics. The use of MSNs as reflectors proved to be an effective practical method for enhancing the performance of thin film solar cells. Due to silica’s abundance and biocompatibility, MSNs are an attractive material for meeting the low-cost and non-toxic requirements for commercially viable integrated PVs.

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Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating

Cited by 16 publications

References 28 publications

Bifacial Color-Tunable Electroluminescent Devices

Bifacial Color-Tunable Electroluminescent Devices

Effect of Thermal Treatment on the Structure and Morphology of Vanadium Doped ZnO Nanostructures Obtained by Microwave Assisted Sol–Gel Method

Enhancing Light Harvesting in Dye-Sensitized Solar Cells through Mesoporous Silica Nanoparticle-Mediated Diffuse Scattering Back Reflectors

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