Anti-reflection and self-cleaning meso-porous TiO2 coatings as solar systems protective layer: Investigation of effect of porosity and roughness

Rad, Alireza Sharifi; Afshar, Abdollah; Azadeh, Mohsen

doi:10.1016/j.optmat.2020.110027

Cited by 27 publications

(11 citation statements)

References 37 publications

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“…Nevertheless, coating a perovskite layer with a higher MoO x concentration is expected to lower the absorption of the sample due to the possibility of light scattering in the MoO x layer, where optical reflection losses occur. It has been reported that the reflective index of the MoO x film was in the range of 2.00–2.25 at a solar radiation wavelength of 750 nm depending on the preparation conditions. , However, reflective indices of 2.5 for MAPbI 3 and 2.1 for MAPbBr 3 were reported. , It is worth mentioning that the minimal reflection loss is obtained when the optical index of the coating layer is equal to the square root of the surrounding medium’s reflective index multiplied by the index of reflection of the substrate being used. , The optical band gap of amorphous MoO x was found to lie in a range of 3.0–3.5 eV and greatly depended on the preparation conditions. , Cauduro et al reported a band gap of 3.06 eV for substoichiometric MoO 2.57 films. On the other hand, the optical band gap is 3.29 eV when a stoichiometric MoO 3 layer is deposited…”

Section: Results and Discussionmentioning

confidence: 99%

“…32,33 It is worth mentioning that the minimal reflection loss is obtained when the optical index of the coating layer is equal to the square root of the surrounding medium's reflective index multiplied by the index of reflection of the substrate being used. 34,35 The optical band gap of amorphous MoO x was found to lie in a range of 3.0−3.5 eV and greatly depended on the preparation conditions. 36,37 Cauduro et al reported a band gap of 3.06 eV for substoichiometric MoO 2.57 films.…”

Section: Resultsmentioning

confidence: 99%

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Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Rosungnern

Kumnorkaew

Kayunkid

et al. 2021

ACS Appl. Energy Mater.

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Organic–inorganic perovskite solar cells (PSCs), which have good environmental durability, are of great interest for practical applications. In this work, we show that a solution-processed MoO x layer acts as a buffer layer against high moisture stress to suppress defects in the perovskite and as a hole transport layer. The inversion of the photoinduced charge migration behaviors, that is, the electron preferentially moving toward the surface when MoO x is directly deposited onto the perovskite, is found to cause a significant loss in device functionality. The deposition of MoO x onto spiro-OMeTAD results in a lower photocurrent density–voltage (J–V) hysteresis behavior, a greatly enhanced electrical conductivity, and a significantly stabilized power conversion efficiency (PCE) when compared with those of devices without the MoO x layer. More importantly, the PCEs of the MoO x -based devices are retained at over 85% of their initial value, while only 75% is retained for a reference cell. This work highlights the facial fabrication approach of the solution-based MoO x layer and provides experimental evidence of the photogenerated charge migration behaviors on the perovskite/MoO x interface. This information would be beneficial for the further design and development of PSC technology.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Rosungnern

Kumnorkaew

Kayunkid

et al. 2021

ACS Appl. Energy Mater.

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“…However, several other physicochemical strategies have been adopted for enhanced performance of TiO 2 ARCs. These include the inclusion of a porogen (pore-forming agent) and chemical acid-etching with 5% HF that increase the porosity and surface roughness, respectively, and reduce reflectivity (Rad et al, 2020).…”

Section: Physicochemical Strategies For Improved Tio 2 Antireflection and Self-cleaning Propertiesmentioning

confidence: 99%

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

et al. 2021

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Titanium(IV) oxide (TiO2, titania) is well-known for its excellent photocatalytic properties, wide bandgap, chemical resistance, and photostability. Nanostructured TiO2 is extensively utilized in various electronic and energy-related applications such as resistive switching memory devices, flat panel displays, photodiodes, solar water-splitting, photocatalysis, and solar cells. This article presents recent advances in the design and nanostructuring of TiO2-containing antireflective self-cleaning coatings for solar cells. In particular, the energy harvesting efficiency of a solar cell is greatly diminished by the surface reflections and deposition of environmental contaminants over time. Nanostructured TiO2 coatings not only minimize reflection through the graded transition of the refractive index but simultaneously improve the device’s ability to self-clean and photocatalytically degrade the pollutants. Thus, novel approaches to achieve higher solar cell efficiency and stability with pristine TiO2 and TiO2-containing nanocomposite coatings are highlighted herein. The results are compared and discussed to emphasize the key research and development shortfalls and a commercialization perspective is considered to guide future research.

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“…The most effective method to eliminate surface reflection is the application of an antireflective coating 3–5 . Numerous studies have shown that the surface modification of the polymer films by organic coating is relatively simple, and the antireflective effect cannot meet the ideal requirements 6 . Organic–inorganic hybrid materials show better performance compare with that.…”

Section: Introductionmentioning

confidence: 99%

Preparation and research of optical coating of star‐shaped titanium‐oxo cluster‐hybrid material

Cheng

et al. 2022

J of Applied Polymer Sci

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In this article, the titanium‐oxo cluster containing bromine had been prepared by solvothermal synthesis, which was used to initiate the atom transfer radical polymerization of butyl methacrylate in order to obtain organic–inorganic hybrid materials. The structures and compositions of titanium‐oxo cluster and its hybrid materials were characterized by X‐ray photoelectron spectroscopy (XPS), 1H nuclear magnetic and infrared spectra tests. The hybrid materials with different molecular weights were dissolved in tetrahydrofuran and coated on the surface of polyethylene terephthalate (PET) film, which was used to study the surface properties. Compared with 89.7% light transmittance of the pure PET film, the light transmittance of the modified films was up to 93.3%. Meanwhile, the water contact angles of the modified films also significantly increased. It would be conducive to the self‐cleaning of the film surface. The coatings prepared by the static respiration diagram method had better hydrophobic effect and show the performance of light scattering. All of that could be proved through the scanning electron microscope (SEM) images. The elastic modulus and hardness of hybrid materials also change with the increase of molecular weight. In addition, the Tg of the hybrid materials increased, which means they have better thermal stability than that of Polybutylmethacrylate (PBMA).

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Anti-reflection and self-cleaning meso-porous TiO2 coatings as solar systems protective layer: Investigation of effect of porosity and roughness

Cited by 27 publications

References 37 publications

Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

Preparation and research of optical coating of star‐shaped titanium‐oxo cluster‐hybrid material

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Anti-reflection and self-cleaning meso-porous TiO2 coatings as solar systems protective layer: Investigation of effect of porosity and roughness

Cited by 27 publications

References 37 publications

Impact of a Spun-Cast MoOx Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Impact of a Spun-Cast MoOx Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

Preparation and research of optical coating of star‐shaped titanium‐oxo cluster‐hybrid material

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Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

Impact of a Spun-Cast MoO_x Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells