Research Highlight

Atachment
첨부 '1'
Extra Form
author Han Young Woo
journal Energy Environ. Sci., 2015, 8, 2713-2724
Homepage http://www.ooml.korea.ac.kr/
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄

The coexistence of intermixed amorphous polymer : fullerene phases alongside pure semicrystalline polymer and fullerene phases provides a plausible explanation for effective charge separation in organic photovoltaic blends by providing a cascaded energy landscape. We sought to test this proposal by spectroscopically tracking charge dynamics in 3-phase blends compared with binary counterparts and linking these dynamics to free charge yields. Our study applies broadband transient absorption spectroscopy to a series of closely related alternating thiophene–benzothiadiazole copolymers in which the tuned curvature of the polymer backbone controls the nature and degree of polymer–fullerene intermixing. Free charge generation is most efficient in the 3-phase morphology that features intimately mixed polymer: PCBM regions amongst neat polymer and PCBM phases. TA spectral dynamics and polarization anisotropy measurements reveal the sub-nanosecond migration of holes from intermixed to pure polymer regions of such blends. In contrast, 2-phase blends lack the spectral dynamics of this charge migration process and suffer from severe geminate recombination losses. These results provide valuable spectroscopic evidence for an efficient charge separation pathway that relies on the 3-phase morphology.

우한영_1.gif


http://pubs.rsc.org/en/content/articlelanding/2015/ee/c5ee01713k#!divAbstract



  1. Structure and assembly mechanisms of toxic human islet amyloid polypeptide oligomers associated with copper

    Amyloidosis is a clinical disorder implicated with the formation of toxic amyloid aggregates. Despite their pathological significance, it is challenging to define the structural characteristics of amyloid oligomers owing to their metastable ...
    Read More
  2. A High Efficiency Nonfullerene Organic Solar Cell with Optimized Crystalline Organizations

    A well-organized donor–acceptor crystalline structure is examined for high ­performance nonfullerene solar cells. By thermal annealing, nanoscale structures of both donor and acceptor domains are successfully modulated, followed by ­signific...
    Read More
  3. Diastereomeric Resolution of a Racemic Biaryl Boronic Acid and Its Application to Divergent Asymmetric Total Syntheses of Some Axially Chiral Natural Products

    The asymmetric total syntheses of deshydroxy-tetramethylcupressuflavone and desmethylkotanin and the synthesis of a key intermediate in the previous synthesis of hibarimicinone were described using an axially chiral biaryl boronic acid, prep...
    Read More
  4. Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy

    Polydiacetylenes (PDAs) with thermochromic properties undergo colorimetric transitions when the external temperature is varied. This capability has the potential to enable these materials to be used as temperature sensors. These thermochromi...
    Read More
  5. Facet-controlled hollow Rh2S3 hexagonal nanoprisms as highly active and structurally robust catalysts toward hydrogen evolution reaction

    Hollow Rh2S3 hexagonal nanoprisms, prepared by one-step formation of Cu1.94S@Rh2S3core-shell nanoprisms followed by the etching of core, exhibit very high catalytic activity and excellent stability toward hydrogen evolution reaction under ha...
    Read More
  6. High Aspect Ratio Conjugated Polymer Nanowires for High Performance Field-Effect Transistors and Phototransistors

    We synthesized a highly crystalline DPP-based polymer, DPPBTSPE, which contained 1,2-bis(5-(thiophen-2-yl)selenophen-2-yl)ethene as a planar and rigid electron donating group. High- and low-molecular weight (MW) DPPBTSPE fractions were colle...
    Read More
  7. Supramolecular Enhancement of Protein Analysis via the Recognition of Phenylalanine with Cucurbit[7]uril

    Mass spectrometry (MS)-based analysis using enzymatic digestion is widely used for protein sequencing and characterization. The large number of peptides generated from proteolysis, however, suppresses the signal of peptides with low ionizati...
    Read More
  8. Disulfide-Based Multifunctional Conjugates for Targeted Theranostic Drug Delivery

    Theranostics, chemical entities designed to combine therapeutic effects and imaging capability within one molecular system, have received considerable attention in recent years. Much of this interest reflects the promise inherent in personal...
    Read More
  9. Spectroscopically tracking charge separation in polymer : fullerene blends with a three-phase morphology

    The coexistence of intermixed amorphous polymer : fullerene phases alongside pure semicrystalline polymer and fullerene phases provides a plausible explanation for effective charge separation in organic photovoltaic blends by providing a cas...
    Read More
  10. Chromogenic/Fluorogenic Ensemble Chemosensing Systems

    Nature has endowed human beings with many useful functions, by virtue of supramolecular chemistry. As is well-known, nature can self-assemble relatively small molecular precursors into very complicated biomolecules. These supramolecular ense...
    Read More
  11. Skeletal Octahedral Nanoframe with Cartesian Coordinates via Geometrically Precise Nanoscale Phase Segregation in a Pt@ Ni Core-Shell Nanocrystal

    Catalytic properties of nanoparticles can be significantly enhanced by controlling nanoscale alloying and its structure. In this work, by using a facet-controlled Pt@Ni coreshell octahedron nanoparticle, we show that the nanoscale phase segr...
    Read More
  12. Diketopyrrolopyrrole: brilliant red pigment dye-based fluorescent probes and their applications

    The development of fluorescent probes for the detection of biologically relevant species is a burgeoning topic in the field of supramolecular chemistry. A number of available dyes such as rhodamine, coumarin, fluorescein, and cyanine have be...
    Read More
  13. Enhanced NIR Radiation-Triggered Hyperthermia by Mitochondrial Targeting

    Mitochondria are organelles that are readily susceptible to temperature elevation. We selectively delivered a coumarin-based fluorescent iron oxide nanoparticle, Mito-CIO, to the mitochondria. Upon 740 nm laser irradiation, the intracellular...
    Read More
  14. Temperature-dependent dynamics of water in aqueous NaPF6 solution

    Dynamics of water in bulk and ionic hydration shells in aqueous ionic solutions are different because of the local environments. However, direct measurements of the dynamics of water in ionic hydration shells apart from those of bulk water a...
    Read More
  15. Diamine-functionalized metal–organic framework: exceptionally high CO2 capacities from ambient air and flue gas, ultrafast CO2 uptake rate, and adsorption mechanism

    A framework en-Mg2(dobpdc) (1-en; en = ethylenediamine) functionalized with the primary amine en was prepared via postmodification. From synchrotron PXRD data, it is revealed that the cell parameters change upon grafting of en and CO2 uptake...
    Read More
  16. pH-Dependent Proton Conducting Behavior in a Metal–Organic Framework Material

    A porous metal–organic framework (MOF), [Ni2(dobdc)(H2O)2]⋅6 H2O (Ni2(dobdc) or Ni-MOF-74; dobdc4−=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(do...
    Read More
  17. Template-Guided Solution-Shearing Method for Enhanced Charge Carrier Mobility in Diketopyrrolopyrrole-Based Polymer Field-Effect Transistors

    Template-guided solution-shearing (TGSS) is used to fabricate field-effect transistors (FETs) composed of micropatterned prisms as active channels. The prisms comprise highly crystalline PTDPP-DTTE, in which diketopyrrolopyrrole (DPP) is fla...
    Read More
  18. Mitochondrial Induced and Self-Monitored Intrinsic Apoptosis by Antitumor Theranostic Prodrug: In Vivo Imaging and Precise Cancer Treatment

    Activation of apoptosis, the cell death machinery, in tumor cells by organelle-specific delivery of antitumor theranostic agent is the utmost challenge in cancer therapy. Herein, we developed a highly efficient mitochondria-targeting antitum...
    Read More
  19. Two-Color Probe to Monitor a Wide Range of pH Values in Cells

    Abstract High-tech pH paper : A “chameleon” pH probe composed of rhodamine (red, see scheme) and fluorescein (green) units emits at wavelengths of 580 nm and 512 nm, where the intensities show a contrary response to pH changes. Confocal micr...
    Read More
  20. A Self-Calibrating Bipartite Viscosity Sensor for Mitochondria

    Abstract High-tech pH paper : A self-calibrating bipartite viscosity sensor 1 for cellular mitochondria, composed of coumarin and boron-dipyrromethene (BODIPY) with a rigid phenyl spacer and a mitochondria-targeting unit, was synthesized. Th...
    Read More
Board Pagination Prev 1 ... 4 5 6 7 8 9 10 Next
/ 10