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C-Si hybrid photonic structures by full infiltration of conjugated polymers into porous silicon rugate filters

Robbiano, V; Surdo, S; Minotto, A; Canazza, G; Lazzerini, GM; Mian, SM; Comoretto, D; ... Cacialli, F; + view all (2018) C-Si hybrid photonic structures by full infiltration of conjugated polymers into porous silicon rugate filters. Nanomaterials and Nanotechnology , 8 10.1177/1847980418788404. Green open access

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Abstract

Loading of one-dimensional (1-D) porous silicon photonic crystals (PS-PhCs), known as rugate filters, with luminescent materials is generally limited by the potential for (undesired) “pore clogging,” in relation to the size of the nanoparticles (e.g. quantum dots) or molecular species, and so far mainly restricted to small molecular weight materials or small nanocrystals, or in situ polymerized dyes. Here we report the infiltration 1-D PS-PhCs with a green-emitting commercial luminescent polymer (F8BT, poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)]), with a molecular weight of approximately 46 kDa across their whole depth (approximately 7.5 μm), thereby showing that pore clogging is not a concern for these structures. We also characterize the modification of the photoluminescence (PL) and decay rates, and investigate the detailed inner morphology of the filters with the help of (scanning) transmission electron microscopy. We observe both suppression (in the stop-band) and enhancement (at the high-energy band-edge) of the PL. We also find that the photonic stop-band is red-shifted after polymer infiltration, due to the increased effective refractive index of the polymer-infiltrated nanostructured system. The presence of just one unbroadened peak in the reflectance spectra after infiltration confirms that infiltration extends for the whole depth of the rugate filters.

Type: Article
Title: C-Si hybrid photonic structures by full infiltration of conjugated polymers into porous silicon rugate filters
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/1847980418788404
Publisher version: https://doi.org/10.1177%2F1847980418788404
Language: English
Additional information: This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
Keywords: Science & Technology, Technology, Physical Sciences, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied, Science & Technology - Other Topics, Materials Science, Physics, Electrochemical etching, polyfluorene derivative, photoluminescence modification, radiative decay rate, silicon photonics, hybrid photonics, light-emitting-diodes, interchain interactions, spontaneous emission, crystals, microcavities, polyrotaxanes, enhancement, fabrication, interlayer, device
URI: http://discovery.ucl.ac.uk/id/eprint/10054170
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