Doo‐Hyun Ko

Carrier Dynamics in Nonfullerene Acceptor Organic Photovoltaics through Ultrafast Spectroscopy

Seung-Hyun Ji, Chihyung Lee, Minjung Chae, Seunghyun Noh et autres

Nonfullerene acceptors (NFAs) have transformed organic photovoltaics (OPVs) by enabling high efficiencies at small energetic offsets, but rational progress demands a mechanistic view of photoinduced processes across femtosecond-microsecond windows. This review synthesizes ultrafast spectroscopy─transient absorption, pump-push-probe, and two-dimensional electronic spectroscopy─to reveal how …

kr, ye (code pays fourni par la source)

Beyond Descriptor‐Based AI Design: Sp 2 ‐Hybridized Branched Side Chains Enable Pre‐Aggregation–Driven Seeding Effects in Green‐Solvent‐Processed Organic Solar Cells

Seokhwan Jeong, Donghoo Won, Zhe Sun, Chihyung Lee et autres

ABSTRACT Descriptor‐based artificial intelligence (AI) has emerged as a paradigm for molecular design in organic solar cells (OSCs); however, it inherently overlooks collective effects governed by bond hybridization, intermolecular coupling, and aggregation thermodynamics. Such effects are encoded at the solution stage, where …

kr (code pays fourni par la source)

Sticker-type polydimethylsiloxane anti-reflective coating with inverted-pyramid structure for improved light absorption in perovskite solar cells

Su-Kyung Kim, Il-Song Kim, Hae‐Jun Seok, Doo‐Hyun Ko et autres

kr (code pays fourni par la source)

Can Fully Vacuum‐Processed Perovskite Solar Cells Follow the Footprint of OLEDs?

Mina Kim, K S Lee, Eun‐Sang Kwon, SeungHee Park et autres

ABSTRACT Perovskite solar cells (PSCs) have rapidly advanced as a promising photovoltaic technology, achieving certified efficiencies exceeding 27% for single‐junction and 34% for tandem configurations. However, commercialization is hindered by solution‐based fabrication challenges, including solvent toxicity, interlayer damage, and poor large‐area uniformity. …

kr, jp (code pays fourni par la source)

Optically Switchable Organic Field Effect Transistor via Intensity Modulated Single Near‐IR Source

Sungil Sunwoo, Namhyeon Heo, Chihyung Lee, Ilsong Kim et autres

ABSTRACT Optically switchable organic field effect transistors (OFETs) offer an additional modality for conventional electronic devices, allowing their electrical output to be switched via a specific optical input. Previously, optically switchable OFETs employing photochromic molecules such as diarylethenes (DAEs) incorporated into the …

kr (code pays fourni par la source)

A Paradigm Shift Toward Quasi‐Thermodynamically Stable Bulk Heterojunction Morphology Enabled by Controlled Crystallization Kinetics of High Quadrupole Moment Nonfullerene Acceptors

Chihyung Lee, Minwoo Nam, Heesung Jeong, Cheolho Lim et autres

ABSTRACT Recent advances in high quadrupole moment () non‐fullerene acceptors (NFAs) have improved exciton diffusion and charge separation in organic photovoltaics (OPVs). However, conventional bulk heterojunctions (BHJs) with a balanced donor‐to‐acceptor ratio often exhibit amorphous mixed domains, introducing energetic disorder and limiting …

kr, cn (code pays fourni par la source)

Thermodynamic Nucleation‐Guided Alloy‐Like Non‐Fullerene Blends Enabling Morphology‐Driven Intra‐Moiety Excited State Dynamics for High‐Performance Near‐Infrared Organic Photodetectors

Kyounguk Cho, Minwoo Nam, Minjung Kathy Chae, Seung Ju You et autres

Abstract Y6‐series non‐fullerene acceptors (NFAs) promise numerous opportunities in organic optoelectronics owing to their ability to generate intra‐moiety excited (i‐EX) states, which enable efficient charge separation within NFA domains. However, fully exploiting the benefits of the i‐EX mechanism requires highly crystalline and …

kr, us (code pays fourni par la source)

Unlocking Wavelength‐Selective Modulations of Open‐Circuit Voltage in Metal Halide Perovskite Solar Cells

Yunfei Hu, Kyounguk Cho, Doo‐Hyun Ko, Inchan Hwang

The photovoltaic performance of metal halide perovskite solar cells often respond divergently to environmental conditions during storage. In particular, light exposure can either enhance or degrade device efficiency, yet the mechanisms underlying these antithetical behaviors are still under investigation. In this study, …

kr (code pays fourni par la source)

Rapid antigen test based on gold nanoparticles embedded with highly sensitive surface-enhanced Raman scattering probes for detecting antigen concentrations below the visual detection limit

Hyeon Ho Shin, Minseo Kim, Yeongchang Goh, Jin Soo Shin et autres

kr (code pays fourni par la source)

Upconverting Plasmonic Polarizer for Selective Enhancement and Polarization of Upconversion Photoluminescence

Namhyeon Heo, Byung‐Hoon Kim, Minseo Kim, Sungil Sunwoo et autres

We demonstrate an upconverting plasmonic polarizer (UPP) as an innovative platform that boosts the upconversion photoluminescence (UCPL) intensity and simultaneously modulates its polarization. The UPP features a metal–insulator–metal structure comprising upconversion nanoparticle-embedded SiO 2 and silver nanogratings. This UPP is deliberately designed …

kr, us, jp (code pays fourni par la source)

Conductive colloidal perovskite quantum dot inks towards fast printing of solar cells

Xuliang Zhang, Hehe Huang, Chenyu Zhao, Lujie Jin et autres

cn, kr, hk (code pays fourni par la source)

Crystallization‐Driven Optimization of Morphology and Performance in Near‐Infrared Organic Photodetectors via Alkyl Side Chain Tuning of Narrow Bandgap Non‐Fullerene Acceptors

Kyounguk Cho, Jong‐Woon Ha, Minwoo Nam, Chihyung Lee et autres

Abstract Narrow bandgap non‐fullerene acceptors (NBG NFAs) are crucial in advancing near‐infrared organic photodetectors (NIR OPDs). However, the polymorphous behavior of NFAs introduces energetic disorder and charge‐trapping sites in the bulk heterojunction (BHJ) active layers, thereby hindering the NIR performance of OPDs. …

kr (code pays fourni par la source)