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Integrated organic donor-acceptor bulk heterojunctions for self-activated liquid crystal light modulators

Integrated organic donor-acceptor bulk heterojunctions for self-activated liquid crystal light modulators
Integrated organic donor-acceptor bulk heterojunctions for self-activated liquid crystal light modulators

Optically addressed spatial light modulators (OASLM) are promising for holographic applications and optical limiters. Self-activated OASLMs can operate as autonomous energy devices, opening the route to stand-alone laser protection devices and smart windows. They are mainly based on liquid crystal (LC) devices, integrated with inorganic photovoltaic substrates such as LiNbO3:Fe or dye-sensitized TiO2. While robust, they also suffer from several restrictions such as high costs, low performances and/or small device area. In this work, we propose a new type of an autonomous modulator. Blends of electron-donating (D) conjugated polymers and electron-accepting (A) fullerene molecules were used as a photovoltaic thin films and integrated into liquid crystal device. Such D/A bulk heterojunctions are the major building block of solution-processed organic solar cells and are known to convert incident light into electrical energy. In our case, the organic layer generates a photovoltaic field that is used to control the LC alignment under illumination. We carried out cross-polarized intensity measurements on this photovoltaic-LC device to demonstrate the expected occurrence of a light-dependent birefringence change, without an applied voltage. In this way, by combining solution-processed organic photovoltaic thin films with optical responsive liquid crystals, our work paves the way to low cost and large area self-sustained optical devices.

Liquid crystals, optically addressed spatial light modulator, P3HT, PCBM, photovoltaics
1-7
SPIE
Regrettier, Thomas
3527887d-fc03-439a-96f8-d37dda07e9cd
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Heiser, Thomas
c7ab9914-611b-4ded-bd4b-a3524b33f794
Regrettier, Thomas
3527887d-fc03-439a-96f8-d37dda07e9cd
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Heiser, Thomas
c7ab9914-611b-4ded-bd4b-a3524b33f794

Regrettier, Thomas, Kaczmarek, Malgosia, D'Alessandro, Giampaolo and Heiser, Thomas (2018) Integrated organic donor-acceptor bulk heterojunctions for self-activated liquid crystal light modulators. In Liquid Crystals XXII. vol. 10735, SPIE. pp. 1-7 . (doi:10.1117/12.2320692).

Record type: Conference or Workshop Item (Paper)

Abstract

Optically addressed spatial light modulators (OASLM) are promising for holographic applications and optical limiters. Self-activated OASLMs can operate as autonomous energy devices, opening the route to stand-alone laser protection devices and smart windows. They are mainly based on liquid crystal (LC) devices, integrated with inorganic photovoltaic substrates such as LiNbO3:Fe or dye-sensitized TiO2. While robust, they also suffer from several restrictions such as high costs, low performances and/or small device area. In this work, we propose a new type of an autonomous modulator. Blends of electron-donating (D) conjugated polymers and electron-accepting (A) fullerene molecules were used as a photovoltaic thin films and integrated into liquid crystal device. Such D/A bulk heterojunctions are the major building block of solution-processed organic solar cells and are known to convert incident light into electrical energy. In our case, the organic layer generates a photovoltaic field that is used to control the LC alignment under illumination. We carried out cross-polarized intensity measurements on this photovoltaic-LC device to demonstrate the expected occurrence of a light-dependent birefringence change, without an applied voltage. In this way, by combining solution-processed organic photovoltaic thin films with optical responsive liquid crystals, our work paves the way to low cost and large area self-sustained optical devices.

Full text not available from this repository.

More information

Published date: 14 September 2018
Venue - Dates: Liquid Crystals XXII 2018, San Diego, United States, 2018-08-19 - 2018-08-20
Keywords: Liquid crystals, optically addressed spatial light modulator, P3HT, PCBM, photovoltaics

Identifiers

Local EPrints ID: 426064
URI: https://eprints.soton.ac.uk/id/eprint/426064
PURE UUID: 3825b463-48aa-4917-b57c-17f80fd06963
ORCID for Giampaolo D'Alessandro: ORCID iD orcid.org/0000-0001-9166-9356

Catalogue record

Date deposited: 12 Nov 2018 17:30
Last modified: 20 Jul 2019 01:19

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