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Reversible spin-optical interface in luminescent organic radicals
Sebastian Gorgon, Kuo Lv, Jeannine Grüne +16
Molecules present a versatile platform for quantum information science, and are candidates for sensing and computation applications. Robust spin-optical interfaces are key to harne…
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…
Mechanism of carrier localization in doped perovskite nanocrystals for bright emission
Sascha Feldmann, Mahesh Gangishetty, Ivona Bravic +7
Nanocrystals based on metal-halide perovskites offer a promising material platform for highly efficient lighting. Using transient optical spectroscopy, we study excitation recombin…
Bandgap Lowering in Mixed Alloys of Cs2Ag(SbxBi1-x)Br6 Double Perovskite Thin Films
Zewei Li, Sean Kavanagh, Mari Napari +10
Halide double perovskites have gained significant attention, owing to their composition of low-toxicity elements, stability in air and long charge-carrier lifetimes. However, most…
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…
Local Strain Heterogeneity Influences the Optoelectronic Properties of Halide Perovskites
Timothy W. Jones, Anna Osherov, Mejd Alsari +18
Halide perovskites are promising semiconductors for inexpensive, high-performance optoelectronics. Despite a remarkable defect tolerance compared to conventional semiconductors, pe…
Maximising and Stabilising Luminescence in Metal Halide Perovskite Device Structures
Mojtaba Abdi-Jalebi, Zahra Andaji-Garmaroudi, Stefania Cacovich +14
Metal halide perovskites are attracting tremendous interest for a variety of optoelectronic applications. The ability to tune the perovskite bandgap by tweaking the chemical compos…
Ultrafast carrier thermalization in lead iodide perovskite probed with two-dimensional electronic spectroscopy
Johannes M. Richter, Federico Branchi, Franco Valduga de Almeida Camargo +4
In band-like semiconductors, charge carriers form a thermal energy distribution rapidly after optical excitation. In hybrid lead halide perovskites, the cooling of such thermal car…
Highly efficient light-emitting diodes based on intramolecular rotation
Dawei Di, Alexander S. Romanov, Le Yang +5
The efficiency of an organic light-emitting diode (OLED) is fundamentally governed by the spin of recombining electron-hole pairs (singlet and triplet excitons), since triplets can…
Mapping Morphological and Structural Properties of Lead Halide Perovskites by Scanning Nanofocus XRD
Samuele Lilliu, Thomas G. Dane, Jonathan Griffin +6
Scanning nanofocus X-ray diffraction (nXRD) performed at a synchrotron is used for the first time to simultaneously probe the morphology and the structural properties of spin-coate…
Kinetic Control of Recombination in Organic Photovoltaics: The Role of Spin
Akshay Rao, Philip C. Y. Chow, Simon Gélinas +6
In photovoltaic diodes recombination of photogenerated electrons and holes is a major loss process. Biological light harvesting complexes (LHCs) prevent recombination via the use o…
Determining exciton bandwidth and film microstructure in polythiophene films using linear absorption spectroscopy
Jenny Clark, Jui-Fen Chang, Frank C. Spano +2
We analyze the linear absorption spectrum of regioregular poly(3-hexylthiophene) films spun from a variety of solvents to probe directly the film microstructure and how it depends…
The role of intermolecular coupling in the photophysics of disordered organic semiconductors: Aggregate emission in regioregular polythiophene
Jenny Clark, Carlos Silva, Richard H. Friend +1
We address the role of excitonic coulping on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorpt…