Prof. Thomas Heiser Profile

Prof. Thomas Heiser

at Univ de Strasbourg

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Publications (9)

Proceedings Article | 13 March 2024 Presentation

Versatile characterisation of photovoltaic and optically thin liquid crystal systems

Malgosia Kaczmarek, Giampaolo D'Alessandro, Nicolas Brouckaert, Denitsa Bankova, Oleksandr Buchnev, Thomas Heiser

Proceedings Volume PC12907, PC129070D (2024) https://doi.org/10.1117/12.3000917

KEYWORDS: Liquid crystals, Photovoltaics, Crystal optics, Spectral response, Windows, Wave plates, Viscosity, Transmittance, Thin films, Thin film solar cells

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Proceedings Article | 5 October 2023 Presentation

Self-powered dynamic glazing based on twisted-nematic liquid crystals and organic photovoltaic layers

Thomas Heiser, Sadiara Fall, Yuhan Zhong, Jing Wang, Thomas Ducatel, Martin Brinkmann, Nicolas Leclerc, Nicolas Brouckaert, Thomas Regrettier, Olzhas Ibraikulov, Malgosia Kaczmarek

Proceedings Volume PC12658, PC126580I (2023) https://doi.org/10.1117/12.2676830

KEYWORDS: Liquid crystals, Organic photovoltaics, Modulation, Transmittance, Photovoltaics, Spectral response, Windows, Transparency, Thin films, Thin film solar cells

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Proceedings Article | 30 May 2022 Presentation

Photovoltaic spatial light modulators for self-powered smart windows

Yuhan Zhong, Jing Wang, Sadiara Fall, Yaochen Lin, Nicolas Brouckaert, Chaima Mahmoudi, Wenziz Muzuzu, Nicolas Leclerc, Malgosia Kaczmarek, Martin Brinkmann, Thomas Heiser

Proceedings Volume PC12149, PC121490M (2022) https://doi.org/10.1117/12.2622197

KEYWORDS: Photovoltaics, Transmittance, Liquid crystals, Heterojunctions, Sun, Molecules, Solar cells, Optical properties, Modulators, Transparency

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Photovoltaic spatial light modulators form a new class of dynamic glazing that could be of interest to smart windows applications. The structure of the modulators includes a twisted nematic liquid crystal layer and an organic donor-acceptor bulk heterojunction. The latter is in contact with the liquid crystal and is used as a molecular alignment layer. In addition, under illumination, the bulk heterojunction generates an electric field that can be strong enough to orient the liquid crystal molecules homeotropically and change the device optical transmittance, without requiring an external power source. The transmittance of this hybrid device adjusts spontaneously to ambient light within less than a second, with a sensitivity that can be tuned by a passive resistor. While this unique combination of features is desirable for smart windows, the device maximum transmittance in the clear state is currently limiting the possible scope of application. In this contribution, we will firstly present the detailed structure, elaboration procedure and optical properties of a first generation of photovoltaic spatial light modulators that are based on commercially available polymer:fullerene blends and liquid crystals. The physical mechanism underlying the device operation will be demonstrated by crossed-polarizer intensity measurements as a function of incident light intensity and applied voltages. Furthermore, the time-dependent transmittance of a device that is exposed to a pulsed light source will be presented in order to assess its response time and reversibility. In the second part we will describe various routes that we are following to improve the device optical properties in terms of maximum transmittance and sensitivity to ambient light. In particular, a new high band-gap semiconducting molecule that has been designed to achieve a highly transparent bulk heterojunction layer and increase the photo-induced electric field will be presented and its utilization in photovoltaic spatial light modulators will be shown.

Proceedings Article | 24 May 2022 Presentation + Paper

Exciton lifetime in donor-acceptor-donor planar dumbbell-shaped triazatruxene-thienopyrroledione derivatives

Jiang Jing, Emilie Steveler, Nicolas Leclerc, Anthony D'Aléo, Benoît Heinrich, Wilfried Uhring, Thomas Heiser

Proceedings Volume 12149, 1214904 (2022) https://doi.org/10.1117/12.2615963

KEYWORDS: Excitons, Thin films, Crystals, Solid state physics, Molecules, Molecular self-assembly, Luminescence, Liquid crystals, Diffusion

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Proceedings Article | 1 August 2021 Presentation

Self-powered photovoltaic liquid crystal light modulators (SP-PSLM)

Sadiara Fall, Nicolas Brouckaert, Yaochen Lin, Nina Podoliak, Malgosia Kaczmarek, Giampaolo D'Alessandro, Mohammed Ibn Elhaj, Lachezar Komitov, Thomas Heiser

Proceedings Volume 11807, 118070A (2021) https://doi.org/10.1117/12.2594240

KEYWORDS: Liquid crystals, Photovoltaics, Modulators, Transmittance, Measurement devices, Tandem solar cells, Solar energy, Power supplies, Polarizers, Photonic crystals

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Proceedings Article | 20 August 2020 Presentation

Mapping quality and parameters of photovoltaic liquid crystal modulators

Malgosia Kaczmarek, Nina Podoliak, Oleksandr Buchnev, Giampaolo D'Alessandro, Nicolas Brouckaert, Thomas Heiser, Sadiara Fall

Proceedings Volume 11472, 114720G (2020) https://doi.org/10.1117/12.2567640

KEYWORDS: Liquid crystals, Modulators, Photovoltaics, Organic photovoltaics, LCDs, Absorption, Switches, Solar cells, Solar energy, MATLAB

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Proceedings Article | 1 April 2020 Presentation

Exciton dynamics in donor-acceptor-donor molecules: impact of molecular structure and self-assembly on the exciton lifetime

Jiang JING, Emilie Steveler, Nicolas Leclerc, Benoît Heinrich, Wilfried Uhring, Thomas Heiser

Proceedings Volume 11365, 113650F (2020) https://doi.org/10.1117/12.2554570

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Proceedings Article | 14 September 2018 Paper

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

Thomas Regrettier, Malgosia Kaczmarek, Giampaolo D'Alessandro, Thomas Heiser

Proceedings Volume 10735, 1073514 (2018) https://doi.org/10.1117/12.2320692

KEYWORDS: Liquid crystals, Optically addressed spatial light modulators, Photovoltaics, Birefringence, Heterojunctions, Diffraction, Thin films, Organic photovoltaics, Molecules, Modulators

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Proceedings Article | 1 October 2011 Paper

Surface plasmon effect on metallic nanoparticles integrated in organic solar cells

S. Vedraine, V. Gernigon, Ph. Torchio, F. Flory, T. Heiser, P. Leveque, L. Escoubas

Proceedings Volume 8172, 81720G (2011) https://doi.org/10.1117/12.896840

KEYWORDS: Silver, Solar cells, Absorption, Photovoltaics, Nanoparticles, Organic photovoltaics, Ions, Aluminum, Surface plasmons, Metals

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Showing 5 of 9 publications

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