A5055461879- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- Machine Learning in Materials Science
- Chalcogenide Semiconductor Thin Films
- solar cell performance optimization
- Analytical Chemistry and Sensors
- Optical Coatings and Gratings
- Nanofabrication and Lithography Techniques
- Thin-Film Transistor Technologies
- Green IT and Sustainability
- Crystallography and molecular interactions
- Surface Modification and Superhydrophobicity
- Thermal properties of materials
- Nonlinear Optical Materials Studies
- Advanced Materials and Mechanics
- Advanced Fluorescence Microscopy Techniques
- Nanoplatforms for cancer theranostics
- Graphene research and applications
- Computational Drug Discovery Methods
- Semiconductor materials and interfaces
University of California, Santa Barbara
2022-2024
Pusan National University
2016-2024
Shortwave infrared (SWIR) sensing has various applications, including night vision, remote sensing, and medical imaging. SWIR organic photodetectors (OPDs) offer advantages such as flexibility, cost-effectiveness, tunable properties; however, lower sensitivity limited spectral coverage compared to inorganic counterparts are major drawbacks. Here, we propose a simple yet effective widely applicable strategy extend the wavelength detection range of OPD longer wavelength, using resonant optical...
The charge generation-recombination dynamics in three narrow-bandgap near-IR absorbing nonfullerene (NFA) based organic photovoltaic (OPV) systems with varied donor concentrations of 40%, 30%, and 20% are investigated. dilution the polymer visible-range absorption leads to highly transparent active layers blend average visible transmittance (AVT) values 64%, 70%, 77%, respectively. Opaque devices optimized reproducible device configuration comprising these lead photoconversion efficiencies...
Fused-ring core nonfullerene acceptors (NFAs), designated "Y-series," have enabled high-performance organic solar cells (OSCs) achieving over 18% power conversion efficiency (PCE). Since the introduction of these NFAs, much effort has been expended to understand reasons for their exceptional performance. While several studies identified key optoelectronic properties that govern high PCEs, little is known about molecular level origins large variations in performance, spanning from 5% PCE,...
Organic photodetectors (OPDs) capable of detecting visible to near-infrared light provide a ubiquitous platform for emerging flexible and wearable electronics. In the process implementing OPDs into Si-based manufacturing process, organic semiconductors undergo ≥ 200 °C thermal stress, leading deterioration photosensing capability. Here, we combine multiscale characterization device physics unravel impact stress on optoelectronics characteristics PTB7-Th:non-fullerene acceptor blends (NFAs:...
A new method is reported to make air-stable n-type organic mixed ionic-electronic conductor (OMIEC) films for electrochemical transistors (OECTs) using a solution-processable small molecule helical perylene diimide trimer, hPDI[3]-C
Solution-processed organic photodetectors with broadband activity have been demonstrated an environmentally benign solvent, ortho-xylene (o-xylene), as the processing solvent. The employ a wide band gap polymer donor PBDB-T and narrow small-molecule non-fullerene acceptor CO1-4F, both dissolvable in o-xylene at controlled temperature. o-xylene-processed devices shown external quantum efficiency of up to 70%, surpassing counterpart processed chlorobenzene. With well-suppressed dark current,...
A wet processing method to fabricate high-performance organic electrochemical transistors (OECTs) is reported. Wet chemical enables a simple and reliable patterning step, substituting several complex expensive cleanroom procedures in the fabrication of OECTs. We depletion-mode OECTs based on poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) enhancement-mode conjugated polyelectrolyte PCPDTBT-SO3K rigid flexible substrates using this method. show that step can also serve as...
We assess state of machine learning for organic photovoltaic devices and data availability within the field, discuss best practices in representations model selection, release a comprehensive dataset fabrication conditions.
We propose co-solvent vapor annealing (SVA) as an effective post-treatment process to improve the quality of crystals and grains for high-efficiency perovskite solar cells.
We report on the use of molecular acceptors and donor polymers processed with a biomass-derived solvent 2-methyltetrahydrofuran to facilitate bulk heterojunction organic photovoltaics power conversion efficiency approaching 15%.
Abstract Organic electrochemical transistors (OECTs) have gained considerable attention due to their potential applications in emerging biosensor platforms. The use of conjugated polyelectrolytes (CPEs) as active materials OECTs is particularly advantageous owing functional, water‐processable, and biocompatible nature, well tunable electronic ionic transport properties. However, there exists a lack systematic studies the structure‐property relationships these with respect OECT performance....
Abstract The use of dry transferred graphene as a templating layer to enhance face‐to‐face stacking in poly(3‐hexylthiophene) (P3HT) systems which is widely used for organic optoelectronics investigated. In contrast conventional poly(methyl methacrylate) (PMMA) assisted wet graphene, found the current work be quite suitable roll‐to‐roll process due its lack PMMA residue, whose removal would require high‐temperature annealing. Grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) determine...
To overcome the fundamental limitation of low power conversion efficiency (PCE) perovskite solar cells (PSCs) incorporated with a magnetron sputtered p-type NiOx as hole transport layer (HTL), effects various sputtering conditions on MAPbI3 PSC performance are comprehensively investigated. Based stoichiometry control bulk and surface by controlling oxygen partial pressure during process, it is found that PSCs HTL prepared in an Ar atmosphere exhibits higher PCEs than those devices...
The effective structure control of poly(3-hexylthiophene) (P3HT) is suggested for efficient sequentially processed organic solar cells by using various volatile solvents.
Our study explores the current state of machine learning (ML) as applied to predicting and designing organic photovoltaic (OPV) devices. We outline key considerations for selecting method encoding a molecular structure algorithm while also emphasizing important aspects training rigorously evaluating ML models. This work presents first dataset OPV device fabrication data mined from literature. The top models achieve state-of-the-art predictive performance. In particular, we identify an that...
Varied-length conjugated polyelectrolytes (2–5 methylene units) containing CPDT- alt -BT were synthesized to study the optical, electrochemical, and morphological properties. These used in accumulation mode organic electrochemical transistors.
An efficient method which enables one to transform the orientation and enhance electrical properties of a conjugated polymer thin film is proposed <italic>via</italic> laser direct writing.