In Situ Visualization and Quantification of Electrical Self‐Heating in Conjugated Polymer Diodes Using Raman Spectroscopy

Maity, Sudeshna; Ramanan, Charusheela; Ariese, Freek; MacKenzie, Roderick C. I.; Hauff, Elizabeth von

doi:10.1002/aelm.202101208

Cited by 4 publications

(5 citation statements)

References 82 publications

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“…Raman spectroscopy is a well-established method for the investigation of functional polymers in general [37] and shape-memory polymers in particular, [38,39] and we previously used this technique in multiple studies to investigate the binding conditions in the switching moiety. [17,18,36,40] Therefore, all polymer samples were studied by Raman spectroscopy to confirm the successful cross-linking via the thiol-ene reaction.…”

Section: Raman Spectroscopic Investigationmentioning

confidence: 99%

Thiol‐ene Reaction as Reversible Covalent Bond for the Design of Shape‐Memory Polymers

Shohraty

Hniopek

Meurer

et al. 2023

Macro Materials & Eng

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Besides a stable phase, shape‐memory polymers require an additional switchable moiety. In addition to thermal transitions and supramolecular interactions, these units can also be based on covalent bonds. Herein, the use of the reversible thiol‐ene reaction as reversible cross‐linker for the design of shape‐memory polymers is demonstrated. A facile route to polymer networks with a thiol‐ene acceptor and a comonomer (butyl methacrylate or 2‐ethylhexyl methacrylate) cross‐linked by dithiols is introduced. The thermal and mechanical properties of the resulting polymers are characterized in detail. Hereby, the polymers feature excellent shape‐memory behavior with fixity and recovery rates above 90%. This study shows that the thiol‐ene cross‐linker can function as both, the stable and the switchable structural moiety rendering the usage of a covalent cross‐linker unnecessary. This partial reversibility can also be proven by temperature‐depending Raman spectroscopy.

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Section: Raman Spectroscopic Investigationmentioning

confidence: 99%

Thiol‐ene Reaction as Reversible Covalent Bond for the Design of Shape‐Memory Polymers

Shohraty

Hniopek

Meurer

et al. 2023

Macro Materials & Eng

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“…We then discretized these images using a regular triangular mesh, vertex removal was performed to reduce the number of triangles in the mesh, and the back of the object sealed with two more triangles to generate an enclosed object. The mesh describing the morphology was loaded into our 2D finite difference drift diffusion model (https://www.gpvdm.com) [22]. The structure was then projected onto a 2D finite difference grid by shooting light rays from each mesh point on the grid to the top of the simulation world.…”

Section: Exploiting Simulated Morphologiesmentioning

confidence: 99%

Preconditioning for a Phase-Field Model with Application to Morphology Evolution in Organic Semiconductors

Kai Bergermann,

Carsten Deibel,

Roland Herzog

et al. 2023

CICP

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The Cahn-Hilliard equations are a versatile model for describing the evolution of complex morphologies. In this paper we present a computational pipeline for the numerical solution of a ternary phase-field model for describing the nanomorphology of donor-acceptor semiconductor blends used in organic photovoltaic devices. The model consists of two coupled fourth-order partial differential equations that are discretized using a finite element approach. In order to solve the resulting large-scale linear systems efficiently, we propose a preconditioning strategy that is based on efficient approximations of the Schur-complement of a saddle point system. We show that this approach performs robustly with respect to variations in the discretization parameters. Finally, we outline that the computed morphologies can be used for the computation of charge generation, recombination, and transport in organic solar cells.

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“…The thermal response of the Raman peak shifts is related to the change in vibrational frequency of the Raman-active molecules, amplified by the typical anharmonicity of their potential energy surfaces . Until now, the temperature-dependent Raman shift has been observed in many materials, such as inorganic and organic semiconductors. ,− …”

Section: Introductionmentioning

confidence: 99%

“… 31 Until now, the temperature-dependent Raman shift has been observed in many materials, such as inorganic and organic semiconductors. 24 , 32 − 37 …”

Section: Introductionmentioning

confidence: 99%

Nanoscale Thermometry of Plasmonic Structures via Raman Shifts in Copper Phthalocyanine

Askes

Rosendo

et al. 2023

J. Phys. Chem. C

Self Cite

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Temperature measurements at the nanoscale are vital for the application of plasmonic structures in medical photothermal therapy and materials science but very challenging to realize in practice. In this work, we exploit a combination of surface-enhanced Raman spectroscopy together with the characteristic temperature dependence of the Raman peak maxima observed in β-phase copper phthalocyanine (β-CuPc) to measure the surface temperature of plasmonic gold nanoparticles under laser irradiation. We begin by measuring the temperature-dependent Raman shifts of the three most prominent modes of β-CuPc films coated on an array of Au nanodisks over a temperature range of 100−500 K. We then use these calibration curves to determine the temperature of an array of Au nanodisks irradiated with varying laser powers. The extracted temperatures agree quantitatively with the ones obtained via numerical modeling of electromagnetic and thermodynamic properties of the irradiated array. Thin films of β-CuPc display low extinction coefficients in the blue-green region of the visible spectrum as well as exceptional thermal stability, allowing a wide temperature range of operation of our Raman thermometer, with minimal optical distortion of the underlying structures. Thanks to the strong thermal response of the Raman shifts in β-CuPc, our work opens the opportunity to investigate photothermal effects at the nanoscale in real time.

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In Situ Visualization and Quantification of Electrical Self‐Heating in Conjugated Polymer Diodes Using Raman Spectroscopy

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/aelm.202101208.

Cited by 4 publications

References 82 publications

Thiol‐ene Reaction as Reversible Covalent Bond for the Design of Shape‐Memory Polymers

Thiol‐ene Reaction as Reversible Covalent Bond for the Design of Shape‐Memory Polymers

Preconditioning for a Phase-Field Model with Application to Morphology Evolution in Organic Semiconductors

Nanoscale Thermometry of Plasmonic Structures via Raman Shifts in Copper Phthalocyanine

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