Measurement and Correlation of the Striations in a Liquid Film During Sudden Separation

Cohen, Mitchell; Ettles, C. M. McC.

doi:10.1080/05698198708981734

Cited by 9 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…perovskites. [110] By contrast, Son et al found that adding a small excess of MAI into the precursor solution induces the accumulation of an excess of MAI GBs for reducing nonradiative recombination for higher device performance (Figure 9a). [111] Yang et al showed in an earlier study that ≈20% excess MAI in an otherwise stoichiometric MAPbI 3 precursor solution enabled a higher-temperature annealing of perovskite without thermal decomposition, leading to much enlarged, uniform grain growth over a large substrate area for the first demonstration of >15%-efficient 1 cm 2 PSCs.…”

Section: Ammonium Saltsmentioning

confidence: 97%

“…[109] There have been long, extended efforts in using additives of excessive ammonium salts derivatives in the perovskite precursor solution to assist perovskite growth with enhanced crystalline properties and surface morphology. Typical ammonium salt derivative-based additives, as shown in Table 6, include organic halides (e.g., MAI, [110,111] methylammonium chloride (MACl), [9,13,[112][113][114][115][116][117][118] methylammonium bromide (MABr), [119] and ammonium chloride (NH 4 Cl) [120][121][122][123] ), organic pseudohalides (e.g., methylammonium thiocyanate, [124] guanidine thiocyanate (GuaSCN), [125] ammonium thiocyanate (NH 4 SCN) [126] ), organic nonhalides (e.g., methylammonium acetate [127] and ammonium acetate [128] ).…”

Section: Ammonium Saltsmentioning

confidence: 99%

See 1 more Smart Citation

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Wang

Zhu

2019

Advanced Energy Materials

528

451

View full text Add to dashboard Cite

Perovskite solar cells (PSCs) have reached a certified 25.2% efficiency in 2019 due to their high absorption coefficient, high carrier mobility, long diffusion length, and tunable direct bandgap. However, due to the nature of solution processing and rapid crystal growth of perovskite thin films, a variety of defects can form as a result of the precursor compositions and processing conditions. The use of additives can affect perovskite crystallization and film formation, defect passivation in the bulk and/or at the surface, as well as influence the interface tuning of structure and energetics. Here, recent progress in additive engineering during perovskite film formation is discussed according to the following common categories: Lewis acid (e.g., metal cations, fullerene derivatives), Lewis base based on the donor type (e.g., O‐donor, S‐donor, and N‐donor), ammonium salts, low‐dimensional perovskites, and ionic liquid. Various additive‐assisted strategies for interface optimization are then summarized; additives include modifiers to improve electron‐ and hole‐transport layers as well as those to modify perovskite surface properties. Finally, an outlook is provided on research trends with respect to additive engineering in PSC development.

show abstract

Section: Ammonium Saltsmentioning

confidence: 97%

Section: Ammonium Saltsmentioning

confidence: 99%

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Wang

Zhu

2019

Advanced Energy Materials

528

451

View full text Add to dashboard Cite

show abstract

“…[5,9] In its most common implementation, hybrid halide perovs kites are formed via a socalled onestep solutioncoating pro cess, whereby all solute components are dissolved in an organic solvent, such as N,Ndimethylformamide (DMF), spincast on a substrate, and subsequently thermally annealed. [4,10] A wide range of deposition techniques ranging from spin coating, [3] dip coating, [11] blade coating, [12] spray coating, [13] printing, [14] to vacuum deposition [15] have been attempted for deposition of perovskite thin films. To date, the onestep spincoating process remains the most facile and widely used method for fabricating polycrystalline hybrid perovskite films.Despite its apparent simplicity, perovskite film formation from solution remains largely a mystery, with strong evidence in the literature pointing to the salts and solvent interacting in far more complex ways than in conversional solutionpro cessing of organic semiconductors, to name one example.…”

mentioning

confidence: 99%

Hybrid Perovskite Thin‐Film Photovoltaics: In Situ Diagnostics and Importance of the Precursor Solvate Phases

et al. 2016

View full text Add to dashboard Cite

Solution-processed hybrid perovskite semiconductors attract a great deal of attention, but little is known about their formation process. The one-step spin-coating process of perovskites is investigated in situ, revealing that thin-film formation is mediated by solid-state precursor solvates and their nature. The stability of these intermediate phases directly impacts the quality and reproducibility of thermally converted perovskite films and their photovoltaic performance.

show abstract

“…Figure 5a and b demonstrates the effect of inertia on cavity growth and decay for a single excursion ratio (Fig. 5b) is useful in relation to determining the likelihood of cavitation damage (7). The effect of increasing the excursion ratio in relation to h is shown in Fig.…”

Section: $ Cavitated Inertia Solution (Cgb Analysis) $ Cavitated Vismentioning

confidence: 98%

The Effect of Fluid Inertia and Cavitation on the Performance of Oscillatory Squeeze-Film Bearings

Hashemi

Roylance

1990

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The underlying objective of this investigation is to provide a simple model and solution for predicting the behaviour of cavitation and its effects. The analytical cavitation model developed is based on experimental observations and is conjined to an incompressible, Newtonian lubricant subjected to a squeezing sinusoidal motion between two parallel, flat circular plates under laminar flow conditions. The combined effects ofjluid inertia and cavitation are considered for conditions of viscous and inertia solutions, Re, = 0 and Re, 2 I respectively. Both dynamic and steady state behaviour of the growth and collapse of a centrally located single bubble are analysed in which the efects ofpuid inertia are examined. The results of analysis are presented in terms of excursion ratio e, Sommerfeld number S, squeeze velocity number N and the normalized bubble parameter a,. The results conjirm the formation of a net force due tofluid inertia and cavitation under different flow conditions. NOTATIONamplitude of vibration (m) coefficients of differential equation cavity radius (m) cavity front velocity (m/s) excursion ratio = a/ho dimensionless velocity = k/h, o frequency, cavitation frequency and normalized frequency (Hz) dynamic and reference load (N) film force, normalized steady force dimensionless acceleration = h/ho w2 instantaneous film gap velocity and acceleration [h = h, -a sin (ot)] mean film gap (m) dimensionless film gap = h/h, dimensionless term = N E / H dimensionless term = N E 2 / H 2 squeeze velocity number = pR2w2/P, local, reference pressure (N/m2) cavity pressure = B , H$B2 H 2 (N/m2) dimensionless term = N G / H PIP, P -Pa P -1 radius of plate (m) modified Reynolds number = p hi w/p Sommerfeld number = p w R 2 / P , hz time (s) radial and axial velocity components (m/s) cavity volume = xB2h (m3) rate of change of cavity volume (m3/s) axial coordinate dimensionless cavity radius coefficients dimensionless radius or width = r/R dynamic viscosity (N s/m2) kinematic viscosity (rn2/s) density (kg/m3) dimensionless time = o t angular velocity = w = 27Ff(rad/s)

show abstract

Measurement and Correlation of the Striations in a Liquid Film During Sudden Separation

Cited by 9 publications

References 13 publications

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Hybrid Perovskite Thin‐Film Photovoltaics: In Situ Diagnostics and Importance of the Precursor Solvate Phases

The Effect of Fluid Inertia and Cavitation on the Performance of Oscillatory Squeeze-Film Bearings

Contact Info

Product

Resources

About