-phenylenevinylene)s L4. Fluorene-Based Conjugated Polymers L4.1. Fluorene-Based Copolymers ContainingElectron-Rich MoietiesM4.2. Fluorene-Based Copolymers ContainingElectron-Deﬁcient MoietiesN4.3. Fluorene-Based Copolymers ContainingPhosphorescent ComplexesQ5. Carbazole-Based Conjugated Polymers R5.1. Poly(2,7-carbazole)-Based Polymers R5.2. Indolo[3,2-

https://ir.nctu.edu.tw:443/bitstream/11536/6508/1/000271856900020.pdf

Synthesis of Conjugated Polymers for Organic Solar Cell Applications

Elements Of X Ray Diffraction

Advanced polyimide materials: Syntheses, physical properties and applications

The research on the polymer-based solar cells (PSCs) has attracted an increasing amount of attention in recent years because PSCs pose potential advantages over mainstream inorganic-based solar cells, such as significantly reduced material/fabrication costs, flexible substrates, and light weight of finished solar cells. The research community has made great progress in the field of bulk heterojunction (BHJ) polymer solar cells since its inception in 1995. The power conversion efficiency (PCE), a key parameter to assess the performance of solar cells, has increased from 1% in the 1990s to over 8% just recently. These great advances are mainly fueled by the development of conjugated polymers used as the electron-donating materials in BHJ solar cells. In this Perspective, we first briefly review the progress on the design of conjugated polymers for polymer solar cells in the past 16 years. Since a conjugated polymer can be arbitrarily divided into three constituting components—the conjugated backbone, the si...

/pdf/rational-design-of-high-performance-conjugated-polymers-for-4cpngxv0an.pdf

Rational Design of High Performance Conjugated Polymers for Organic Solar Cells

Molecular Semiconductors in Organic Photovoltaic Cells

Graphite has a stacked planar sp2-hybridized C6 ring structure, displaying a polymorphism with rhombohedral, hexagonal, and turbostratic. Based on its structure-property relationship, it affords a variety of technologically innovative applications or performances in industries, such as lithium-ion batteries, fuel cells, two dimensional graphene, water purification, electronics, fiber optics, spintronics, refractories, electrical products, electric vehicles, etc. The monetary value of graphite depends largely on carbon content and flake size. However, the physical separation of graphite from its ore body is known to be very expensive, energy intensive and time-consuming. Hence, this study extensively describes a current purification method for producing high-quality graphite material with impurities reaching about 10–100 mg/kg, attracting a lot of end users. It also describes the potential applications of graphite materials and identifies the future scope of a new market, depending on material purity. Finally, the current and future graphite-mining countries are investigated in details.

Purification, application and current market trend of natural graphite: A review

The phase diagrams for three conjugated polymer/fullerene blends of interest for polymer solar cells, namely semicrystalline poly(3-hexylthiophene) (P3HT):methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM), poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-p-phenylenevinylene) (MDMO-PPV):PCBM, and poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV):PCBM, have been constructed based on X-ray scattering data and differential scanning calorimetery (DSC). Both melting point depression and glass transition temperature elevation were observed in the P3HT:PCBM blends as a function of increasing PCBM wt %. The PCBM solubility limit, i.e., the phase-separation point, was determined to be 30, 40, and 50 wt % PCBM for P3HT:PCBM, MDMO-PPV:PCBM, and MEH-PPV:PCBM mixtures, respectively. The phase behavior of the blends is directly correlated with electrical transport behavior determined by measuring field effect conduction in a transistor testbed. Specifically, below the solubility limit for PCBM...

Correlation of Phase Behavior and Charge Transport in Conjugated Polymer/Fullerene Blends

http://bard.cm.utexas.edu/resources/Bard-Reprint/738.pdf

Organic donor/acceptor heterojunction photovoltaic devices based on zinc phthalocyanine and a liquid crystalline perylene diimide

White light emission was obtained from a light-emitting diode prepared from polymer/quantum dot nanocomposites consisting of poly(9,-dihexylfluorene-2,7-divinylene- m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFPPV) and two kinds of CdSe nanoparticles with different particle size. Blue emission from the polymer, green emission from the ?nm CdSe and red emission from the ?nm CdSe, which is triggered by partial excitation energy transfer from the polymer, jointly contribute to white emission of the organic?inorganic hybrid device. Also, the blue-emitting matrix polymer makes the device preparation process simpler due to its high processability. By controlling the blend ratio, we could obtain a pure white colour from the hybrid device.

https://iopscience.iop.org/article/10.1088/0957-4484/15/9/018/pdf

White emission from polymer/quantum dot ternary nanocomposites by incomplete energy transfer

Semicrystalline poly(3-hexyl-2,5-thienylene vinylene) (P3HTV) with a low band gap of 1.65 eV has been synthesized by acyclic diene metathesis polymerization and incorporated into bulk heterojunction (BHJ) organic solar cells. The polymer was thermally characterized by differential scanning calorimetry and thermogravimetric analysis and was blended with the electron acceptor methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) to make a light-harvesting charge-transfer thin film. The properties of P3HTV/PCBM blends were studied as a function of PCBM composition by wide-angle X-ray scattering, atomic force microscopy, transmission electron microscopy, UV−vis absorption spectroscopy, and charge-transport and photovoltaic measurements. The PCBM solubility limit, that is, the phase separation point, was estimated to be 50 wt % PCBM. The phase behavior of the blend was directly correlated with electrical transport behavior in a field-effect transistor testbed. At the phase separation point, charge...

Jung Yong Kim

Papers

Purification, application and current market trend of natural graphite: A review

Correlation of Phase Behavior and Charge Transport in Conjugated Polymer/Fullerene Blends

Organic donor/acceptor heterojunction photovoltaic devices based on zinc phthalocyanine and a liquid crystalline perylene diimide

White emission from polymer/quantum dot ternary nanocomposites by incomplete energy transfer

Low band gap poly(thienylene vinylene)/fullerene bulk heterojunction photovoltaic cells