Soo-Hyung Park

Understanding the excitonic nature of excited states in two-dimensional (2D) transition-metal dichalcogenides (TMDCs) is of key importance to make use of their optical and charge transport properties in optoelectronic applications. We contribute to this by the direct experimental determination of the exciton binding energy (Eb,exc) of monolayer MoS2 and WSe2 on two fundamentally different substrates, i.e. the insulator sapphire and the metal gold. By combining angle-resolved direct and inverse p

Abstract The energy level alignments at donor/acceptor interfaces in organic photovoltaics (OPVs) play a decisive role in device performance. However, little is known about the interfacial energetics in polymer OPVs due to technical issues of the solution process. Here, the frontier ortbial line-ups at the donor/acceptor interface in high performance polymer OPVs, PTB7/PC 71 BM, were investigated using in situ UPS, XPS and IPES. The evolution of energy levels during PTB7/PC 71 BM interface forma

Abstract Tuning the Fermi level (E F ) in two-dimensional transition metal dichalcogenide (TMDC) semiconductors is crucial for optimizing their application in (opto-)electronic devices. Doping by molecular electron acceptors and donors has been suggested as a promising method to achieve E F -adjustment. Here, we demonstrate that the charge transfer (CT) mechanism between TMDC and molecular dopant depends critically on the electrical nature of the substrate as well as its electronic coupling with

A comprehensive understanding of the energy level alignment mechanisms between two-dimensional (2D) semiconductors and electrodes is currently lacking, but it is a prerequisite for tailoring the interface electronic properties to the requirements of device applications. Here, we use angle-resolved direct and inverse photoelectron spectroscopy to unravel the key factors that determine the level alignment at interfaces between a monolayer of the prototypical 2D semiconductor MoS₂ and co

Abstract Van der Waals heterostructures consisting of 2D semiconductors and conjugated molecules are of increasing interest because of the prospect of a synergistic enhancement of (opto)electronic properties. In particular, perylenetetracarboxylic dianhydride (PTCDA) on monolayer (ML)‐MoS 2 has been identified as promising candidate and a staggered type‐II energy level alignment and excited state interfacial charge transfer have been proposed. In contrast, it is here found with inverse and direc

BACKGROUND: We aimed to compare clinical outcomes between immediate and staged complete revascularization in primary percutaneous coronary intervention (PCI) for treating ST-segment elevation myocardial infarction (STEMI) and multivessel disease (MVD). METHODS: A total of 248 patients were enrolled in a prospective, randomized, and multicenter registry. Immediate revascularization was defined as one-time PCI of culprit and non-culprit lesions at the initial procedure. Staged revascularization wa

We describe the case of a 53-year-old woman with keratoconus who presented with a dislocated intrastromal corneal ring segment (ICRS) (Intacs) in the anterior chamber 3 weeks after surgery. To our knowledge, this is the first report of a late occurrence of postoperative anterior chamber dislocation of an ICRS and illustrates the need to consider the potential for such a complication. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned.

We report an occurrence of intracranial hypertension secondary to testosterone therapy in a transgender patient. This is the first reported case to our knowledge demonstrating a direct association with raised levels of free testosterone and intracranial hypertension.

Purpose To achieve highly accelerated submillimeter resolution ‐weighted functional MRI at 7T by developing a three‐dimensional gradient and spin echo imaging (GRASE) with inner‐volume selection and variable flip angles (VFA). Methods GRASE imaging has disadvantages in that (a) k‐space modulation causes blurring by limiting the number of slices and (b) a VFA scheme results in partial success with substantial SNR loss. In this work, accelerated GRASE with controlled blurring is developed to impro

LMX1B haplotypes influence susceptibility to glaucoma in the general population, suggesting altered LMX1B function predisposes to glaucomatous damage and that this role may be independent of raised intraocular pressure.

Abstract Generally, the lack of long-range order in materials prevents from experimentally addressing their electronic band dispersion by angle-resolved photoelectron spectroscopy (ARPES), limiting such assessment to single crystalline samples. Here we demonstrate that the ARPES spectra of azimuthally disordered transition metal dichalcogenide (TMDC) monolayers with 2 H phase are dominated by their band dispersion along the two high symmetry directions Γ-K and Γ-M. We exemplify this by analyzing

We report a rare case of a delayed orbital inflammation with raised intraocular pressure as a result of hyluronidase allergy following sub-Tenon's anaesthesia. Here, we have shown evidence to prove the orbital inflammation to be an allergic response to hyluronidase with a skin patch test. This is the first case to our knowledge of a delayed hypersensitivity reaction to sub-Tenon's hyluronidase comprising of an initial exposure to hyluronidase in the fellow eye with no subsequent allergic respons

Parallel magnetic resonance imaging in k-space such as generalized auto-calibrating partially parallel acquisition exploits spatial correlation among neighboring signals over multiple coils in calibration to estimate missing signals in reconstruction. It is often challenging to achieve accurate calibration information due to data corruption with noises and spatially varying correlation. The purpose of this work is to address these problems simultaneously by developing a new, adaptive iterative g