Small Molecule Anchored to Mesoporous ITO for High-Contrast Black Electrochromics

Nguyen, William; Barile, Christopher J.; McGehee, Michael D.

doi:10.1021/acs.jpcc.6b08820

Cited by 27 publications

(24 citation statements)

References 33 publications

(62 reference statements)

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“…Free carrier concentration in semiconductor materials can be modulated through the application of an external voltage leading to accumulation or depletion of charge carriers near their surfaces and interfaces. This approach has been employed to modulate the optical properties of semiconductor NCs to achieve electrochromism either based on electronic charging in a capacitor device or on electrochemical charging in a battery-type cell (see refs , , , , , , , , , and − ). Electrochemical control of the Fermi level offers a robust approach to disrupt the equilibrium carrier concentration in a film of semiconductor NCs, thus achieving on-demand tuning of their optical properties.…”

Section: Dynamic Lspr Modulationmentioning

confidence: 99%

Localized Surface Plasmon Resonance in Semiconductor Nanocrystals

et al. 2018

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Localized surface plasmon resonance (LSPR) in semiconductor nanocrystals (NCs) that results in resonant absorption, scattering, and near field enhancement around the NC can be tuned across a wide optical spectral range from visible to far-infrared by synthetically varying doping level, and post synthetically via chemical oxidation and reduction, photochemical control, and electrochemical control. In this review, we will discuss the fundamental electromagnetic dynamics governing light matter interaction in plasmonic semiconductor NCs and the realization of various distinctive physical properties made possible by the advancement of colloidal synthesis routes to such NCs. Here, we will illustrate how free carrier dielectric properties are induced in various semiconductor materials including metal oxides, metal chalcogenides, metal nitrides, silicon, and other materials. We will highlight the applicability and limitations of the Drude model as applied to semiconductors considering the complex band structures and crystal structures that predominate and quantum effects that emerge at nonclassical sizes. We will also emphasize the impact of dopant hybridization with bands of the host lattice as well as the interplay of shape and crystal structure in determining the LSPR characteristics of semiconductor NCs. To illustrate the discussion regarding both physical and synthetic aspects of LSPR-active NCs, we will focus on metal oxides with substantial consideration also of copper chalcogenide NCs, with select examples drawn from the literature on other doped semiconductor materials. Furthermore, we will discuss the promise that LSPR in doped semiconductor NCs holds for a wide range of applications such as infrared spectroscopy, energy-saving technologies like smart windows and waste heat management, biomedical applications including therapy and imaging, and optical applications like two photon upconversion, enhanced luminesence, and infrared metasurfaces.

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Section: Dynamic Lspr Modulationmentioning

confidence: 99%

Localized Surface Plasmon Resonance in Semiconductor Nanocrystals

et al. 2018

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“…Many research efforts have focused on the production of electrochromic materials (ECMs), such as transition metal oxides [7], polymers [8,9], and small organic molecules [10]. Tungsten oxide (WO 3 ) is a widely studied inorganic ECM because its superior optical memory and cyclic as well as environmental stability can meet commercial requirements [11,12].…”

Section: Introductionmentioning

confidence: 99%

Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

et al. 2021

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Electrochromic (EC) materials that change color with voltage have been widely studied for use in dynamic windows. However, colorless-to-colorful switching with high contrast ratio is generically unattainable, especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible region. In this work, we developed Nb1.33C MXene-based dynamic windows with colorless-to-black switching of up to 75% reversible change in transmittance from 300 to 1,500 nm. By exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance (EQCM), it is found that electrochromic behavior is greatly influenced by the extent of reversible Li+ insertion/deinsertion between the two-dimensional Nb1.33C MXene nanosheets. In addition, a colorless-to-black EC device based on Nb1.33C with an overall integrated contrast ratio over 80% was successfully constructed by a solution-processable spin coating method. This work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows, which is important for further expanding the application of MXenes to optoelectronic and photonic applications.

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“…However, the unsatisfactory cycling stability of ECP is one of the main reasons restricting their practical application. Structural damage and irreversible redox reactions are primary causes for the performance degradation of ECP. − Different methods have been applied to improve the stability of ECP, such as physical or chemical bonding between the electrochromic film and conductive substrate, cross-linking of the electrochromic chain, and compounding ECP with organic/inorganic nanomaterials. − …”

Section: Introductionmentioning

confidence: 99%

Multiarm Aniline Oligomers: Molecular Architecture, Self-Assembly, and Electrochromic Performance

Wang

Fan

et al. 2020

J. Phys. Chem. C

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Solution-processable aniline oligomers with a benzene ring as the core and para, meta, and triple substituted amino/carboxylcapped tetraaniline (NH 2 -(Ani) 4 -COOH) as arms, named as Bi(p)-(Ani) 4 -COOH, Bi(m)-(Ani) 4 -COOH, and Tri-(Ani) 4 -COOH, were synthesized and characterized. It was found that aniline oligomers with increased arms presented a more regular porous breathing structure revealed by atomic force microscopy. An electrochemical quartz crystal microbalance was used to study their long-term stability by recording the mass change of electrochromic films during redox and analyze the mechanism of ion conduction in the electrochromic process. The results suggested that the porous breathing structure was conducive to H + conduction, which contributed to their improved performance in switching time, coloration efficiency, and cycling stability. Tri-(Ani) 4 -COOH had the shortest switching time (t b = 1.45 s, t c = 1.82 s), highest coloration efficiency (190.7 cm 2 /C), and best cycling stability. Especially on the conductive glass, in 0.5 mol/L sulfuric acid electrolyte, it reached the charge retention of 96.8% after 3000 cycles, implying that the multiarm star-shaped aniline oligomer will be a promising material in electrochromic area with good processability, short switching time, and high cycling stability.

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Small Molecule Anchored to Mesoporous ITO for High-Contrast Black Electrochromics

Cited by 27 publications

References 33 publications

Localized Surface Plasmon Resonance in Semiconductor Nanocrystals

Localized Surface Plasmon Resonance in Semiconductor Nanocrystals

Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

Multiarm Aniline Oligomers: Molecular Architecture, Self-Assembly, and Electrochromic Performance

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