Mesoporous Silica Nanolayers Infiltrated with Hole-Transporting Molecules for Hybrid Organic Light-Emitting Devices

Park, Jin-Woo; Kim, Youngkyoo; Kim, Il; Ha, Chang‐Sik

doi:10.1021/nn7003124

Cited by 17 publications

(18 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been used to characterize the depth profile of other organic materials in an inorganic matrix. [22,23] The XPS depth profiles of spiro-OMeTAD-infiltrated mesoporous TiO 2 films are shown in Figure 2. The 5-mm-thick mesoporous films have three different particle sizes and were prepared by doctor-blading.…”

Section: Resultsmentioning

confidence: 99%

Pore‐Filling of Spiro‐OMeTAD in Solid‐State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance

Ding

Tétreault

Brillet

et al. 2009

Adv Funct Materials

259

281

View full text Add to dashboard Cite

In this paper, the pore filling of spiro‐OMeTAD (2,2′,7,7′‐tetrakis‐(N,N‐di‐p‐methoxyphenylamine)9,9′‐spirobifluorene) in mesoporous TiO2 films is quantified for the first time using XPS depth profiling and UV–Vis absorption spectroscopy. It is shown that spiro‐OMeTAD can penetrate the entire depth of the film, and its concentration is constant throughout the film. We determine that in a 2.5‐µm‐thick film, the volume of the pores is 60–65% filled. The pores become less filled when thicker films are used. Such filling fraction is much higher than the solution concentration because the excess solution on top of the film can act as a reservoir during the spin coating process. Lastly, we demonstrate that by using a lower spin coating speed and higher spiro‐OMeTAD solution concentration, we can increase the filling fraction and consequently the efficiency of the device.

show abstract

Section: Resultsmentioning

confidence: 99%

Pore‐Filling of Spiro‐OMeTAD in Solid‐State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance

Ding

Tétreault

Brillet

et al. 2009

Adv Funct Materials

259

281

View full text Add to dashboard Cite

show abstract

“…Functionalization of mesoporous silica and subsequent reactions to the ligand and then to the metal salt, metal organic or organometallic compounds, or functionalization of the ligand and grafting on mesoporous silica and then reacting with metal containing species, are the most popular methods for covalently bonding light-emitting materials to mesoporous silica [27][28][29]33,34]. Although Q 3 Al has been introduced successfully to the pore of mesoporous materials by using aminopropyltriethoxysilane as a spacer and a high intensity blueshifted photoluminescence has been observed [32,33], the synthetic strategy suffers from multiple steps and low yield reactions in addition to a long spacer, which keeps light-emitting materials far away from the mesoporous surface.…”

Section: Introductionmentioning

confidence: 99%

Grafting aluminum(III) 8-hydroxyquinoline derivatives on MCM-41 mesoporous silica for tuning of the light emitting color

Fazaeli

Amini

Mohajerani

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…[10,11] Among these, mesoporous thin films have attracted significant attention owing to their unique structures and functions. [12][13][14][15] Previously, ordered mesoporous silica films have been synthesized by selfassembly of silica precursors with surfactant templates at air-water [16] or water-oil interfaces, [17] or by using the evaporation-induced self-assembly (EISA) approach. [18] As the surfactant micelles tend to orient parallel to substrates to reduce the surface energy at interfaces, the mesochannels obtained are always oriented parallel to the film surfaces.…”

mentioning

confidence: 99%

Highly Ordered Mesoporous Silica Films with Perpendicular Mesochannels by a Simple Stöber‐Solution Growth Approach

et al. 2012

View full text Add to dashboard Cite

Surfactant-templated synthesis [1,2] has been a focus of materials science, because it provides a unique means to prepare a variety of ordered mesostructured materials with high surface areas and large, uniform pores. These materials have shown great promise for applications in physics, chemistry, and biology. [3][4][5][6][7][8][9] Different morphologies of mesoporous materials, such as spheres, films, monoliths, rods, and fibers, can all be controllably synthesized. [10,11] Among these, mesoporous thin films have attracted significant attention owing to their unique structures and functions. [12][13][14][15] Previously, ordered mesoporous silica films have been synthesized by selfassembly of silica precursors with surfactant templates at air-water [16] or water-oil interfaces, [17] or by using the evaporation-induced self-assembly (EISA) approach.[18] As the surfactant micelles tend to orient parallel to substrates to reduce the surface energy at interfaces, the mesochannels obtained are always oriented parallel to the film surfaces. [3,[19][20][21] Continuous mesoporous films with perpendicularly aligned channels have recently been prepared by guiding the self-assembly of block copolymers or gemini surfactants with organosilica. [22][23][24][25] However, the thermal and mechanical stability of the films are low, as the pore walls consist of polymers and organosilica. Substrate-templating growth strategies for controlling mesopore orientation based on pp or hydrophilic-hydrophobic interactions have been reported. [26][27][28][29][30] However, these methods require special substrates, such as pyrolytic graphite, anodic alumina with conical holes, or block polymer modified glass, and the alignment of the mesophases at their interface is generally of mixed orientation. Furthermore, perpendicular mesochannels have also been prepared by magnetic-field or electrochemically assisted methods. [31,32] However, these methods often require special equipment and complex processes, and the obtained films have poor regularity and low levels of mesochannel alignment. To date, the synthesis of films with mesopore channels perpendicular to a substrate is still a major challenge.The Stçber approach is a facile and effective method for the synthesis of uniform mesoporous silica nanospheres by a self-assembly process using silica precursors with surfactant templates in an aqueous ethanol solution.[33] The ordered mesochannels in these mesoporous silica nanospheres are often oriented radially to the particle surfaces, [34][35][36] which is an ideal pore arrangement for applications such as catalysis and selective adsorption. Herein, we demonstrate a simple Stçber-solution growth method for the synthesis of mesoporous silica thin films with continuous 2D-ordered mesochannels perpendicular to the substrate. This is accomplished by immersing the substrate into a Stçber solution containing cetyltrimethylammonium bromide (CTAB), tetraethoxysilane (TEOS), ethanol, and ammonia. Moreover, a new type of sandwichlike mesoporous silica film, w...

show abstract

Mesoporous Silica Nanolayers Infiltrated with Hole-Transporting Molecules for Hybrid Organic Light-Emitting Devices

Cited by 17 publications

References 31 publications

Pore‐Filling of Spiro‐OMeTAD in Solid‐State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance

Pore‐Filling of Spiro‐OMeTAD in Solid‐State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance

Grafting aluminum(III) 8-hydroxyquinoline derivatives on MCM-41 mesoporous silica for tuning of the light emitting color

Highly Ordered Mesoporous Silica Films with Perpendicular Mesochannels by a Simple Stöber‐Solution Growth Approach

Contact Info

Product

Resources

About