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16 papers · 1 filter
Operando optical tracking of single-particle ion dynamics and phase transitions in battery electrodes
Alice J. Merryweather, Christoph Schnedermann, Quentin Jacquet +2
Key to advancing lithium-ion battery technology, and in particular fast charging capabilities, is our ability to follow and understand the dynamic processes occurring in operating…
The role of charge recombination to spin-triplet excitons in non-fullerene acceptor organic solar cells
Alexander J. Gillett, Alberto Privitera, Rishat Dilmurat +15
The power conversion efficiencies (PCEs) of organic solar cells (OSCs) using non-fullerene acceptors (NFAs) have now reached 18%. However, this is still lower than inorganic solar…
How Does the Symmetry of S1 Influence Exciton Transport in Conjugated Polymers?
Raj Pandya, Antonios M. Alvertis, Qifei Gu +7
Many optoelectronic devices based on organic materials require rapid and long-range singlet exciton transport. Key factors that control the transport of singlet excitons includes t…
Mechanistic Insight to the Chemical Treatments of Monolayer Transition Metal Disulfides for Photoluminescence Enhancement
Zhaojun Li, Hope Bretscher, Yunwei Zhang +5
There is a growing interest in obtaining high quality monolayer transition metal disulfides (TMDSs) for optoelectronic device applications. Surface chemical treatments using a rang…
Ligand Directed Self-Assembly of Bulk Organic-Semiconductor/Quantum-Dot Blend Films Enables Near Quantitative Harvesting of Triplet Excitons
Jesse Allardice, Victor Gray, Simon Dowland +12
Singlet fission (SF), an exciton multiplication process occurring in organic semiconductors, offers a way to break the Shockley-Queisser limit in single-bandgap photovoltaics (PV).…
Efficient Energy Transport in an Organic Semiconductor Mediated by Transient Exciton Delocalization
Alexander J. Sneyd, Tomoya Fukui, David Palecek +15
Efficient energy transport is highly desirable for organic semiconductor (OSC) devices such as photovoltaics, photodetectors, and photocatalytic systems. However, photo-generated e…
Directed Energy Transfer from Monolayer to NIR Emitting PbS-CdS Quantum Dots
Arelo O. A Tanoh, Nicolas Gauriot, Géraud Delport +9
Heterostructures of two-dimensional (2D) transition metal dichalcogenides (TMDs) and inorganic semiconducting zero-dimensional (0D) quantum dots (QDs) offer unique charge and energ…
Ultrafast melting and recovery of collective order in the excitonic insulator TaNiSe
Hope M. Bretscher, Paolo Andrich, Prachi Telang +4
The layered chalcogenide TaNiSe has been proposed to host an excitonic condensate in its ground state, a phase that could offer a unique platform to study and manipulat…
First principles modeling of exciton-polaritons in polydiacetylene chains
Antonios M. Alvertis, Raj Pandya, Claudio Quarti +7
Exciton-polaritons in organic materials are hybrid states that result from the strong interaction of photons and the bound excitons that these materials host. Organic polaritons ho…
The impact of exciton delocalization on exciton-vibration interactions in organic semiconductors
Antonios M. Alvertis, Raj Pandya, Loreta A. Muscarella +7
Organic semiconductors exhibit properties of individual molecules and extended crystals simultaneously. The strongly bound excitons they host are typically described in the molecul…
Giant Photoluminescence Enhancement in MoSe monolayers treated with Oleic Acid Ligands
Arelo O. A Tanoh, Jack Alexander-Webber, Ye Fan +6
The inherently low photoluminescence (PL) yields in as prepared transition metal dichalcogenide (TMD) monolayers are broadly accepted to be the result of atomic vacancies (i.e. def…
Long-lived and disorder-free charge transfer states enable endothermic charge separation in efficient non-fullerene organic solar cells
Philip C. Y. Chow, Ture F. Hinrichsen, Christopher C. S. Chan +11
Organic solar cells (OSCs) based on non-fullerene acceptors can show high charge generation yields despite near-zero donor-acceptor energy offsets to drive charge separation and ov…
Optical and electronic properties of colloidal CdSe Quantum Rings
James Xiao, Yun Liu, Violette Steinmetz +14
Luminescent colloidal CdSe nanorings are a new type of semiconductor structure that have attracted interest due to the potential for unique physics arising from their non-trivial t…
Imaging the coherent propagation of collective modes in the excitonic insulator candidate TaNiSe at room temperature
Hope M. Bretscher, Paolo Andrich, Yuta Murakami +10
Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to collective many-body effects. Although several materials have emerged as excitonic insu…
The bright side of defects in MoS and WS and a generalizable chemical treatment protocol for defect passivation
Hope M. Bretscher, Zhaojun Li, James Xiao +12
Structural defects are widely regarded as detrimental to the optoelectronic properties of monolayer transition metal dichalcogenides, leading to concerted efforts to eliminate defe…
Optical projection and spatial separation of spin entangled triplet-pairs from the S1 (21Ag-) state of pi-conjugated systems
Raj Pandya, Qifei Gu, Alexandre Cheminal +11
The S1 (21Ag-) state is an optically dark state of natural and synthetic pi-conjugated materials that can play a critical role in optoelectronic processes such as, energy harvestin…