Ana M. Valencia

Unveiling the Role of Solvents in DBTTF:HATCN Ternary Cocrystals

Ana M. Valencia, Lisa Schraut-May, Marie Siegert, Sebastian Hammer et autres

High Resolution Image Download MS PowerPoint Slide Donor–acceptor (D:A) cocrystals offer a promising platform for next-generation optoelectronic applications, but the impact of residual solvent molecules on their properties remains an open question. We investigate six novel D:A cocrystals of dibenzotetrathiafulvalene (DBTTF) and …

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Optical properties of Fermi polarons in a GaInP/MoSe 2 monolayer heterostructure

Hangyong Shan, Max Waldherr, Diksha Diksha, Ghada Missaoui et autres

Abstract Engineering optical properties, such as luminescence purity and charge transfer, is crucial for harnessing the application potential of atomically thin transition metal dichalcogenides (TMDCs). While electrostatic gating is widely applied to gain charge control in TMDC monolayers, charge transfer can also …

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Beyond the Edge: Charge‐Transfer Excitons in Organic Donor‐Acceptor Cocrystals

Sebastian Anhäuser, Ana M. Valencia, Sergei I. Ivlev, Marc Zeplichal et autres

ABSTRACT Charge‐transfer excitons (CTXs) at organic donor/acceptor interfaces are crucial intermediates for charge separation in photovoltaic devices. While blends used in real‐world devices hamper detailed characterization of CTXs, atomistic models of cocrystals offer powerful alternatives for gaining microscopic insights. In this work, …

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Photoluminescence Quenching in WSe$_2$ via p-Doping Induced by Functionalized Rylene Dyes

Ana M. Valencia, Theresa Kuechle, Maximiliam Tomoscheit, Sarah Jasmin Finkelmeyer et autres

Hybrid heterostructures combining transition metal dichalcogenides (TMDs) with light-harvesting dyes are promising materials for next-generation optoelectronics. Yet, controlling and understanding interfacial charge transfer mechanisms in these complex systems remains a major challenge. Here, we investigate the microscopic origin of photoluminescence (PL) quenching …

Theoretical data: Photoluminescence Quenching in WSe2 via p-Doping Induced by Functionalized Rylene Dyes

Ana M. Valencia, Caterina Cocchi

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Theoretical data: Photoluminescence Quenching in WSe2 via p-Doping Induced by Functionalized Rylene Dyes

Ana M. Valencia, Caterina Cocchi

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Unveiling the Role of Solvents in DBTTF:HATCN Ternary Cocrystals

Ana M. Valencia, Lisa Schraut-May, Marie Siegert, Sebastian Hammer et autres

Donor-acceptor (D:A) cocrystals offer a promising platform for next-generation optoelectronic applications, but the impact of residual solvent molecules on their properties remains an open question. We investigate six novel D:A cocrystals of dibenzotetrathiafulvalene (DBTTF) and 1,4,5,8,9,11-hexaazatriphenylenehexacarbo-nitrile (HATCN), prepared via solvent evaporation, yielding …

DFT Analysis of PtTi‐Double‐Doped Gold Clusters Growth: Structural, Electronic, and Magnetic Properties

Soumaia Djaadi, Ana M. Valencia, Mustapha Lasmi, Sofiane Mahtout et autres

Abstract In this study, the stability, physical properties, and potential applications of gold clusters (Au n ) are explored. Using Density Functional Theory (DFT) with Generalized Gradient Approximation (GGA) as implemented in the SIESTA Simulation package, we examined the equilibrium geometry, electronic …

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Mitigating triplet loss in 2D WSe 2 /non-fullerene heterostructures using halogenated acceptors

Sreelakshmi Chandrabose, Ana M. Valencia, Meysam Raoufi, Nisreen Alshehri et autres

/ITIC hybrid bilayer due to changes in the nature and energies of the interfacial charge transfer (CT) levels. Our results highlight the delicate balance between excitons and charges in such inorganic/NFA heterostructures.

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Ultrafast Time-Domain Spectroscopy Reveals Coherent Vibronic Couplings upon Electronic Excitation in Crystalline Organic Thin Films

Daniel Timmer, Daniel C. Lünemann, Naby Hadilou, Katrin Winte et autres

The coherent coupling between electronic excitations and vibrational modes of molecules largely affects the optical and charge transport properties of organic semiconductors and molecular solids. To analyze these couplings by means of ultrafast spectroscopy, highly ordered crystalline films with large domains are …

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Mapping the energy-momentum dispersion of hBN excitons and hybrid plasmons in hBN-WSe2 heterostructures

Hannah C. Nerl, Juan Pablo Guerrero-Felipe, Ana M. Valencia, Khairi Elyas et autres

Abstract Heterostructures obtained by combining two-dimensional (2D) sheets are widely investigated as a platform for designing new materials with customised characteristics. Transition metal dichalcogenides (TMDCs) are often combined with hexagonal boron nitride (hBN) to enhance their excitonic resonances. However, little is known …

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Optical Coherence Tomography of Van Der Waals Heterostructures Using Extreme Ultraviolet Light

Felix Wiesner, Johann J. Abel, Muhammad Hussain, Vipin Krishna et autres

Abstract New experimental methods with high out‐of‐plane spatial sensitivity combined with ultrafast temporal resolution can revolutionize the understanding of charge‐ and heat‐transfer dynamics occurring at interfaces. In this work, a step forward is taken in this direction by applying coherence tomography with …

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