A5034925219- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Advanced biosensing and bioanalysis techniques
- Plasmonic and Surface Plasmon Research
- Luminescence Properties of Advanced Materials
- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- X-ray Diffraction in Crystallography
- Glass properties and applications
- Organic and Molecular Conductors Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced Semiconductor Detectors and Materials
- RNA Interference and Gene Delivery
- Ga2O3 and related materials
- Radiation Detection and Scintillator Technologies
- Quantum Dots Synthesis And Properties
- Crystallization and Solubility Studies
University of Cambridge
2017-2023
Fabricating nanocavities in which optically active single quantum emitters are precisely positioned is crucial for building nanophotonic devices. Here we show that self-assembly based on robust DNA-origami constructs can position molecules laterally within sub-5 nm gaps between plasmonic substrates support intense optical confinement. By placing single-molecules at the center of a nanocavity, modification plasmon cavity resonance before and after bleaching chromophore obtain enhancements ≥4...
Detecting low dose rates of X-rays is critical for making safer radiology instruments, but limited by the absorber materials available. Here, we develop bismuth oxyiodide (BiOI) single crystals into effective X-ray detectors. BiOI features complex lattice dynamics, owing to ionic character and weak van der Waals interactions between layers. Through use ultrafast spectroscopy, first-principles computations detailed optical structural characterisation, show that photoexcited charge-carriers in...
Abstract Materials combining semiconductor functionalities with spin control are desired for the advancement of quantum technologies. Here, we study magneto-optical properties novel paramagnetic Ruddlesden-Popper hybrid perovskites Mn:(PEA) 2 PbI 4 (PEA = phenethylammonium) and report magnetically brightened excitonic luminescence strong circular polarization from interaction isolated Mn 2+ ions. Using a combination superconducting interference device (SQUID) magnetometry, magneto-absorption...
One of the open challenges spintronics is to control spin relaxation mechanisms. Layered metal-halide perovskites are an emerging class semiconductors which possess a soft crystal lattice that strongly couples electronic and vibrational states show promise for spintronic applications. Here, we investigate impact such strong coupling on excitons in layered perovskite BA2FAPbI7 using combination cryogenic Faraday rotation transient absorption spectroscopy. We report unexpected increase...
Using circularly polarized broadband transient absorption, time-resolved circular photoluminescence, and Faraday rotation spectroscopy, we report that spin-dependent interactions have a significant impact on exciton energies spin depolarization times in layered Ruddlesden–Popper hybrid metal-halide perovskites. In BA2FAPb2I7, room-temperature lifetimes are largest (3.2 ps) at carrier density of ∼1017 cm–3 with increasing rates higher densities. This indicates many-body reduce spin-lifetimes...
Band gap tuning of hybrid metal–halide perovskites by halide substitution holds promise for tailored light absorption in tandem solar cells and emission light-emitting diodes. However, the impact on crystal structure fundamental mechanism photo-induced segregation remain open questions. Here, using a combination temperature-dependent X-ray diffraction calorimetry measurements, we report emergence disorder- frustration-driven orientational glass wide range compositions CH3NH3Pb(ClxBr1–x)3....
Materials combining the optoelectronic functionalities of semiconductors with control spin degree freedom are highly sought after for advancement quantum technology devices. Here, we report paramagnetic Ruddlesden-Popper hybrid perovskite Mn:(PEA)2PbI4 (PEA = phenethylammonium) in which interaction isolated Mn2+ ions magnetically brightened excitons leads to circularly polarized photoluminescence. Using a combination superconducting interference device (SQUID) magnetometry and...