Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties

Guldin, Stefan; Kolle, Mathias; Stefik, Morgan; Wiesner, Ulrich; Steiner, Ullrich

doi:10.1117/12.893818

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…a 1D PC. 22,23 NP-based MDBRs have been successfully integrated to ESCs, with significant effect on light absorption and overall device efficiency. 10,36,37 As previously discussed, the refractive index lattice in the NP-based MDBRs is realized by the sequential deposition of TiO 2 and SiO 2 NP layers.…”

Section: Soft Matter Design Principles For Photovoltaicsmentioning

confidence: 99%

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Soft matter design principles for inorganic photonic nanoarchitectures in photovoltaics, colorimetric sensing, and self-cleaning antireflective coatings

Guldin

Steiner

2014

SPIE Proceedings

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The self-assembly of soft matter, such as block copolymers or colloids, allows fine tuning of structure formation on the 10 -500 nm length scale and therefore enables the design of materials with tunable optical response. We present strategies on how to exploit these formation principles to assemble inorganic nanoarchitectures with distinct optical properties and point out promising applications in photovoltaics, colorimetric sensing and selfcleaning antireflective coatings.

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Section: Soft Matter Design Principles For Photovoltaicsmentioning

confidence: 99%

mentioning

confidence: 99%

Soft matter design principles for inorganic photonic nanoarchitectures in photovoltaics, colorimetric sensing, and self-cleaning antireflective coatings

Guldin

Steiner

2014

SPIE Proceedings

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Tunable Mesoporous Bragg Reflectors Based on Block Copolymer Self-Assembly

Guldin

2013

Inorganic Nanoarchitectures by Organic Self-Assembly

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Distributed Bragg reflectors (DBRs) consist of periodically alternating layers of high and low refractive index materials, also known as one-dimensional photonic crystals. Interference of light reflected at the interfaces of the dielectric layers leads to strong reflection in a well defined wavelength range resulting in pronounced structural colouration. The spectral response can be finely tuned by varying the refractive index, the thickness, and the number of the alternating layers.1 Simple configurations are realized by sequential coating of thin solid films of alternating refractive index. Direct access to a 1D dielectric lattice via solution processing has been achieved by the self-assembly of block copolymers into a lamellar morphology. 2, 3A interesting recent area of research is the development of mesoporous DBRs (MDBRs) which access new fields of applications due to their porosity on the sub-optical length scale. MDBRs are promising as sensing materials. The adsorption and desorption of gas phase molecules in the pores leads to reversible changes in the refractive index and thereby in the photonic properties of the stack.4-7 Bonifacio et al. introduced the concept of a MDBR-based "photonic nose".8 Other applications include the use of MDBRs as environmentally responsive resonance cavities 10, 11 and their coupling to mesoporous surface layers.12 MDBRs also have great potential in optoelectronic devices. When infiltrated with light emitting polymers, MDBRs have exhibited distributed feedback lasing.13 Efficiency enhancements have been demonstrated by integrating a MDBR into a dye-sensitized solar cell.14 Recently, the coupling of plasmonic particles to MDBR-based resonant cavities has been shown. 15Typically, the refractive index contrast is realized by the alternating deposition of mesoporous layers of TiO 2 and SiO 2 . This concept was first introduced by Ozin and coworkers, who manufactured a TiO 2 /SiO 2 stack with ordered mesoporous morphologies, following a block copolymer directed sol-gel route.4 While the MDBRs exhibited an interconnected pore network, the stack fabrication was extremely time consuming with fabrication times of 4 days or more for each consecutive layer.4, 5 A less complex alternative is the sequential deposition of nanoparticle-based solutions to form mesoporous films. The group of Cohen introduced this concept for a homopolymer mediated nanoparticle approach following numerous dip-coating cycles.9 Miguez et al. subsequently presented

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Block copolymer self-assembly for nanophotonics

et al. 2015

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The ability to control and modulate the interaction of light with matter is crucial to achieve desired optical properties including reflection, transmission, and selective polarization. Photonic materials rely upon precise control over the composition and morphology to establish periodic interactions with light on the wavelength and sub-wavelength length scales. Supramolecular assembly provides a natural solution allowing the encoding of a desired 3D architecture into the chemical building blocks and assembly conditions. The compatibility with solution processing and low-overhead manufacturing is a significant advantage over more complex approaches such as lithography or colloidal assembly. Here we review recent advances on photonic architectures derived from block copolymers and highlight the influence and complexity of processing pathways. Notable examples that have emerged from this unique synthesis platform include Bragg reflectors, antireflective coatings, and chiral metamaterials. We further predict expanded photonic capabilities and limits of these approaches in light of future developments of the field.

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Mesoporous Bragg reflectors: block-copolymer self-assembly leads to building blocks with well defined continuous pores and high control over optical properties

Cited by 3 publications

References 21 publications

Soft matter design principles for inorganic photonic nanoarchitectures in photovoltaics, colorimetric sensing, and self-cleaning antireflective coatings

Soft matter design principles for inorganic photonic nanoarchitectures in photovoltaics, colorimetric sensing, and self-cleaning antireflective coatings

Tunable Mesoporous Bragg Reflectors Based on Block Copolymer Self-Assembly

Block copolymer self-assembly for nanophotonics

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