Dong Ha Kim

While the field of perovskite-based optoelectronics has mostly been dominated by photovoltaics, light-emitting diodes, and transistors, semiconducting properties peculiar to perovskites make them interesting candidates for innovative and disruptive applications in light signal detection. Perovskites combine effective light absorption in the broadband range with good photo-generation yield and high charge carrier mobility, a combination that provides promising potential for exploiting sensitive a

Metal oxide semiconductors hold great promise for applications in energy conversion and storage, environmental remediation, optoelectronics, memory, light emission and other areas, but critical factors such as the high rate of charge-carrier recombination and limited light absorption have restricted more practical and viable applications. The remarkable ability of plasmonic noble metals to concentrate and scatter visible light has found a versatile potential in harvesting and converting solar en

Programmed cell death protein-1/programmed cell death ligand-1 (PD-1/PD-L1) pathway blockade is a promising new cancer therapy. Although PD-1/PD-L1 treatment has yielded clinical benefits in several types of cancer, further studies are required to clarify predictive biomarkers for drug efficacy and to understand the fundamental mechanism of PD-1/PD-L1 interaction between host and tumor cells. Here, we show that exosomes derived from lung cancer cells express PD-L1 and play a role in immune escap

This article examines the effects of social capital in the transition to postsecondary education, in particular, transitions to selective colleges. Refining the theory of social capital with the concept of alignment between parents' and adolescents' goals and actions, we emphasize the complementarity of extra-group ties as social capital through which parents can effectively bridge resources and information to adolescents, enabling them to make informed choices about college. This study explores

ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXTInorganic Nanodots from Thin Films of Block CopolymersDong Ha Kim, Seung Hyun Kim, Kris Lavery, and Thomas P. RussellView Author Information Silvio O. Conte National Center for Polymer Research, Polymer Science and Engineering Department, University of Massachusetts at Amherst, Amherst, Massachusetts 01003 Cite this: Nano Letters 2004, 4, 10, 1841–1844Publication Date (Web):September 9, 2004Publication History Received17 June 2004Published online9 Septe

The interaction between light and matter is the fundamental aspect of many optoelectronic applications. The efficiency of such devices is mainly dictated by the light emitting properties of fluorophores. Unfortunately, the intensity of emission is adversely affected by surface defects, scattering and chemical instability. Therefore, enhancing the luminescence of fluorophores is necessary for better implementation of nanocomposites in biological and optical applications. There are many interestin

Porous alumina templates have been used to prepare dendrimer nanotubes with uniform size and orientation as well as high aspect ratios by a layer-by-layer deposition technique (see SEM image). The tubes may be released from or located in the template pores. Diffusion limitations arising from the pore geometry lead to tube segments with higher mechanical stability when located adjacent to pore openings compared to those located at the base of the pores.

We developed plasmonic dye-sensitized solar cells (DSSCs) with tailor-designed Au-TiO₂ nanostructures integrated into the photoanode. Mutually antagonistic Au-TiO₂ core-shell structures supported on SiO₂ spheres (SiO₂@TiO₂@AuNP and SiO₂@AuNP@TiO₂) were prepared and incorporated as additives into the photoanodes of the DSSCs. The DSSCs employing the nanocrystalline-TiO₂ (nc-TiO₂)/SiO₂@TiO₂@AuNP and nc-TiO₂/SiO₂@AuNP@TiO2₂ as photoanodes showed remarkably enhanced power conversion efficiencies up

The exceptional theoretical capacity of potassium metal anodes (687 mA h g^-1), along with their low electrochemical potential, makes potassium metal batteries (PMBs) highly attractive for achieving high energy density. This review first provides an overview of potassium metal anodes, including their origin, current development status, and distinctive advantages compared to other metal anodes. Then, it discusses the composition and characteristics of emerging breakthrough PMBs, such as

Hybrid materials in optoelectronic devices can generate new functionality or provide synergistic effects that enhance the properties of each component. Here, high‐performance phototransistors with broad spectral responsivity in UV–vis–near‐infrared (NIR) regions, using gold nanorods (Au NRs)‐decorated n‐type organic semiconductor and N , N ′‐bis(2‐phenylethyl)‐perylene‐3,4:9,10‐tetracarboxylic diimide (BPE‐PTCDI) nanowires (NWs) are reported. By way of the synergistic effect of the excellent pho

The incorporation of plasmonic properties recently emerged as an advanced strategy for achieving high-performance catalysis. The hot carriers and near-field enhancement induced by localized surface plasmon resonance (LSPR) excitation are the key parameters that are responsible for the enhanced performance. Thus, the logical combination of the plasmonic nanostructures and electrocatalytic materials can be an effective strategy for further widening application of the plasmonic effect. This short R