Prof. Natalie Stingelin Profile

Prof. Natalie Stingelin

Full Professor at Georgia Institute of Technology

SPIE Involvement:

Proceedings Article | 5 October 2023 Presentation

Insights on exciton photophysics in organic and organic/inorganic hybrid materials with strong light-matter coupling

Victoria Quiros-Cordero, Yulong Zheng, Esteban Rojas-Gatjens, Martin Gomez-Dominguez, Juan-Pablo Correa-Baena, Natalie Stingelin, Carlos Silva-Acuña

Proceedings Volume PC12650, PC126500D (2023) https://doi.org/10.1117/12.2676989

KEYWORDS: Excitons, Polaritons, Photoluminescence, Signal processing, Optical microcavities, Time resolved spectroscopy, Spectroscopy, Scattering, Physics, Perovskite

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Proceedings Article | 1 October 2023 Presentation

Deciphering the difference between flexible chain and hairy-rod polymer semiconductors

Natalie Stingelin

Proceedings Volume PC12660, PC126600P (2023) https://doi.org/10.1117/12.2680886

KEYWORDS: Polymers, Semiconductors, Materials processing, Thermography, Thermodynamics, Solubility, Solar cells, Sensors, Polymer optics, Organic photovoltaics

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Proceedings Article | 1 October 2023 Presentation

Polymer-based chirped broadband reflectors for thermal management

Joseph Mushyakov, Victoria Quiros Cordero, Alex Balzer, Carlos Silva, Natalie Stingelin

Proceedings Volume PC12660, PC126600H (2023) https://doi.org/10.1117/12.2679035

KEYWORDS: Reflectors, Refractive index, Polymers, Windows, Visible radiation, Transparency, Titanium, Reflection, Oxides, Organic materials

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Proceedings Article | 1 October 2023 Presentation

Leveraging thermotropic order to control photophysical response in PBTTT

Mark Weber, Anush Singhal, Teerapat Lapsirivatkul, Carlos Silva, Natalie Stingelin

Proceedings Volume PC12660, PC126600B (2023) https://doi.org/10.1117/12.2683032

KEYWORDS: Polymers, Liquids, Liquid crystals, Crystals, Semiconductors, Anisotropy, X-rays, Vacuum, Solid state physics, Solid state electronics

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Proceedings Article | 29 September 2023 Presentation

Flexible electronics: challenges and opportunities

Natalie Stingelin

Proceedings Volume PC12662, PC1266205 (2023) https://doi.org/10.1117/12.2682193

KEYWORDS: Flexible circuits, Materials science, Transistors, Dielectrics, Solar cells, Semiconductors, Polymers, Organic semiconductors, Organic photovoltaics, Organic light emitting diodes

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Proceedings Article | 3 October 2022 Presentation

A universal conundrum of determination of Frenkel exciton binding energy

Somayeh Kashani, Jeromy Rech, Tuo Liu, Kyle Baustert, Wei You, Kenneth Graham, Carlos Silva, Natalie Stingelin, Gitti Frey, Harald Ade

Proceedings Volume PC12209, PC1220903 (2022) https://doi.org/10.1117/12.2633814

KEYWORDS: Excitons, Photoemission spectroscopy, Ultraviolet radiation, Solid state electronics, Solar energy, Solar cells, Quasiparticles, Polymers, Photovoltaics, Organic semiconductors

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The absorption of a photon by Organic Semiconductors (OSCs) results in the formation of a bound electron-hole pair quasiparticle or Frenkel Exciton. The energy required to separate an exciton into noninteracting electron and hole, Exciton Binding Energy (Eb), is a critical parameter for the purpose of improving the efficiency of optoelectronic devices such as solar cells and light emitting diodes. In the last two decade there have been many efforts to measure the Eb of OSCs using different techniques. However, there are discrepancies in the literature and the reported values are scattered over a large range between a few meV to 1.5eV, even for a specific material. Eb of Frenkel excitons can be estimated as the difference between the transport (Eg) and the optical gap (Eopt), a traditional definition borrowed from the language of Wannier Exciton in inorganic SCs. Here, we explore the Eb of different variants of PBnDT-FTAZ polymer. We focus on the two most common methods used to measure Eg: combination of Ultraviolet Photoelectron Spectroscopy and Inversed Photoelectron Spectroscopy (UPS-IPES) and Solid-State Cyclic Voltammetry (CV). We show that Eb measured by the abovementioned methods are not consistent or correlated with each other. The Eg measured by UPS-IPES technique is comparable with (or even smaller than) Eopt leading to small Eb. On the other hand, CV usually measures larger Eg compared to the Eopt resulting in larger values of Eb that are scattered between 200meV-1eV depending on the molecular structure of the materials. This discrepancy is the result of lack of both an exclusive theoretical and a functional definition of Eb that includes the relaxation effects, an important characteristic of Frenkel excitons. Moreover, due to the nature of each measurement method, they might measure different parameters than the actual properties of the bulk in a photovoltaic device. Our results elucidate the current conundrum on determination of Eb in OSCs and emphasize the importance of establishing standard theoretical and practical guidelines on how to properly estimate Eb.

Proceedings Article | 5 August 2021 Presentation

Lessons learnt with donor:acceptor photovoltaic blends: can they be applied to doped polymer systems?

Natalie Stingelin

Proceedings Volume 11799, 1179916 (2021) https://doi.org/10.1117/12.2596112

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Proceedings Article | 20 August 2015 Paper

Using the Stark effect to understand charge generation in organic solar cells

Jelissa De Jonghe-Risse, Martina Causa', Ester Buchaca-Domingo, Martin Heeney, Jacques-E. Moser, Natalie Stingelin, Natalie Banerji

Proceedings Volume 9549, 95490J (2015) https://doi.org/10.1117/12.2190212

KEYWORDS: Polymers, Solar cells, Absorption, Electrodes, Fullerenes, Organic photovoltaics, Ultrafast phenomena, Molecules, Electronic design automation, Femtosecond phenomena

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Proceedings Article | 11 September 2013 Paper

Long-lived photoexcitations in intercalated, partially and predominantly non-intercalated polymer:fullerene blends

Fei Dou, Ester Buchaca-Domingo, Maciej Sakowicz, Xinping Zhang, Natalie Stingelin, Carlos Silva

Proceedings Volume 8811, 88111J (2013) https://doi.org/10.1117/12.2026147

KEYWORDS: Polarons, Polymers, Modulation, Absorption spectroscopy, Absorption, Crystals, Spectroscopy, Polymer thin films, Fullerenes, Excitons

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Proceedings Article | 27 September 2012 Paper

Optical signatures of the interplay between intermolecular and intramolecular coupling in plastic semiconductors

Francis Paquin, Maciej Sakowicz, Natalie Stingelin, Carlos Silva

Proceedings Volume 8459, 845904 (2012) https://doi.org/10.1117/12.939633

KEYWORDS: Absorption, Luminescence, Polymers, Electronics, Semiconductors, Excitons, Molecular spectroscopy, Molecules, Control systems, Spectroscopy

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SPIE Journal Paper | 1 January 2011 Open Access

Solution processed hybrid photovoltaics: preparation of a standard ZnO template

Jonathan Downing, Mary Ryan, Natalie Stingelin-Stutzmann, Martyn McLachlan

JPE, Vol. 1, Issue 1, 011117, (January 2011) https://doi.org/10.1117/12.10.1117/1.3569104

KEYWORDS: Zinc oxide, Photovoltaics, Scanning electron microscopy, Polymers, Crystals, Standards development, X-ray diffraction, Excitons, Zinc, Nanorods

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