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Morphological Study of Blend Thin Films of Poly(3-hexylthiophene)-<i>block</i>-polyisobutylene-<i>block</i>-poly(3-hexylthiophene):Poly(3-hexylthiophene) and Their Application to Photovoltaics
摘要： The detailed morphological studies of poly(3-hexylthiophene)(P3HT)-b-polyisobutylene(PIB)-b-P3HT:P3HT blend thin films by grazing incidence X-ray scattering (GIXS) were reported. The results of GIXS experiments indicated the formation of phase separation between P3HT and PIB domains even after blending the P3HT homopolymer below 30 wt%. The change in d-spacing values of the phase-separated under strains was suppressed by increasing the weight ratio of the P3HT homopolymer, probably due to the disruption of the microphase separation. The blending the P3HT homopolymer induced the edge-on orientation during the strain process below 75%, probably by improving the interaction between P3HT domains in the blend thin films. The OPV characteristics were obtained with the device structure of ITO/PEDOT:PSS/P3HT-b-PIB-b-P3HT:P3HT:PC61BM/Ca/Al, significantly improving the JSC and FF values by increasing the P3HT homopolymer weight ratio. The excellent elongation behavior of P3HT-b-PIB-b-P3HT:P3HT blend bulk films (P3HT < 30 wt%) could be achieved, probably due to the formation of microphase separation between semi-crystalline P3HT and rubbery PIB domains.
关键词： Organic photovoltaic,Morphology,Block copolymer,π-Conjugated polymer,Elastomer,Synchrotron X-ray scattering
更新于2025-09-16 10:30:52
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Conjugated polymer self-assembled with graphene: Synthesis and electrochemical 1-hydroxypyrene sensor
摘要： Urinary 1-hydroxypyrene (1-OHP), one of the metabolite of polycyclic aromatic hydrocarbons (PAHs), has been extensively applied as a biomarker of animals and human exposure to PAHs. Herein, we synthesized a novel conjugated polymer poly-8-methoxy-7-methyl-5-(10-anthracen-9-yl)quinolone (PMMAYQ) using Suzuki coupling reaction, and then fabricated a homogeneous PMMAYQ/grahene multilayer film via layer-by-layer self-assembly technique and applied for electrochemical sensing of 1-OHP. Under the optimal conditions, {PMMAYQ-Graphene}16 modified glass carbon electrode exhibited excellent response for detection of 1-OHP. A linear range from 0.5 to 120 nM was obtained with a low detection limit of 0.07 nM (S/N=3) and a sensitivity of 0.5539 μA/μM. The electrochemical sensor exhibited excellent stability, accepted repeatability, and good selectivity. The developed method was employed for determination of 1-OHP in human urine samples and recoveries in the range of 95.6%?107.1% were achieved.
关键词： Self-assembly,Electrochemical sensing,Graphene,1-hydroxypyrene,Conjugated polymer
更新于2025-09-16 10:30:52
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Non-conjugated polymers as thickness-insensitive electron transport materials in high-performance inverted organic solar cells
摘要： Two non-conjugated polymers PEIE-DBO and PEIE-DCO, prepared by quaternization of polyethyleneimine ethoxylate by 1,8-dibromooctane and 1,8-dichlorooctane respectively, are developed as electron transport layer (ETL) in high-performance inverted organic solar cells (OSCs), and the effects of halide ions on polymeric photoelectric performance are fully investigated. PEIE-DBO possesses higher electron mobility (3.68×10?4 cm2 V?1 s?1), higher conductivity and more efficient exciton dissociation and electron extraction, attributed to its lower work function (3.94 eV) than that of PEIE-DCO, which results in better photovoltaic performance in OSCs. The inverted OSCs with PTB7-Th: PC71BM as photoactive layer and PEIE-DBO as ETL exhibit higher PCE of 10.52%, 9.45% and 9.09% at the thickness of 9, 35 and 50 nm, respectively. To our knowledge, PEIE-DBO possesses the best thickness-insensitive performance in polymeric ETLs of inverted fullerene-based OSCs. Furthermore, PEIE-DBO was used to fabricate the inverted non-fullerene OSCs (PM6:Y6) and obtained a high PCE of 15.74%, which indicates that PEIE-DBO is effective both in fullerene-based OSCs and fullerene-free OSCs.
关键词： Electron transport materials,Organic solar cells,Thickness-insensitive,Non-conjugated polymer
更新于2025-09-12 10:27:22
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Synthesis of molecular‐weight‐controlled polyfluorene with boronate at one end
摘要： We investigated the synthesis of poly?uorene with a pinacol boronate (PinB) moiety at one end and with controlled molecular weight by means of Suzuki–Miyaura coupling polymerization of 7-bromo-9,9-dioctyl-9H-?uoren-2-yl boronate (1) with a palladium(0) precatalyst in the presence of pinacol 4-tri?uoromethylphenylboronate (2) as a chain terminator and CsF/18-crown-6 as a base. When we used AmPhos Pd G2, which has a propensity for intramolecular catalyst transfer on a π-electron face, poly?uorene with the PinB moiety at one end and PhCF3 (derived from 2) at the other end was obtained, and the molecular weight increased in proportion to the feed ratio of [1]0/[catalyst]0, though the molecular weight distribution was broad. Since the molecular weight also linearly increased with respect to the conversion of 1 until the middle stage of polymerization, the polymerization appears to involve chain-growth polymerization through intramolecular catalyst transfer from the Pd catalyst inserted into the C Br bond of 1. The broad molecular weight distribution might be mainly due to slow initiation and slow termination with 2, rather than polymer–polymer coupling.
关键词： polymer end,conjugated polymer,Suzuki polycondensation,palladium catalyst,poly?uorene,catalyst-transfer condensation polymerization
更新于2025-09-11 14:15:04
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12.1: <i>Invited Paper:</i> Polarization control and optical efficiency improvement of light emitted from OLED using liquid crystalline luminophores
摘要： Highly circularly polarized (CP) light is generated by using a twisted conjugated polymer structure with a small amount of chiral molecules as the light emitting layer of the OLED. It is confirmed that the luminous efficiency is increased by 60% compared to the conventional OLED structure.
关键词： organic light emitting diodes,conjugated polymer,polarized emission,chiral dopant,Circular polarization
更新于2025-09-11 14:15:04
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MEH-PPV/Carbon Nanopearls Nanocomposites for Enhanced Organic Solar Cells Efficiencies
摘要： An organic nanocomposites, based on a conjugated polymer (MEH-PPV) as electron donor material and carbon nanopearls (CNPs) as electron acceptor material, have been elaborated and optoelectronically studied. The effect of CNPs concentration on the electric and photoelectric properties in these blends has been investigated. Dielectric measurements demonstrate that the blend conductivity displays a dramatic increase, reaching 0.6 S/m for a CNPs concentration about 1 wt.%. The elaborated organic nanocomposites were used as photoactive materials in organic solar cells.
关键词： organic nanocomposites,conjugated polymer,carbon nanopearls,photovoltaic response,organic solar cells,electric properties
更新于2025-09-11 14:15:04
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Polymeric, Cost-Effective, Dopant-Free, Hole Transport Materials for Efficient and Stable Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have skyrocketed in the last decade to an unprecedented level due to its outstanding photoelectric properties and facile processability. However, the utilization of expensive hole transport materials (HTMs) and the inevitable instability instigated by the deliquescent dopants represent major concerns hindering further commercialization. Here, a series of low cost, conjugated polymers are designed and applied as dopant free HTMs in PSCs, featuring tuned energy levels, good temperature and humidity resistivity, and excellent photoelectric properties. Further studies highlight the critical and multifaceted roles of the polymers with respect to facilitating charge separation, passivating the surface trap sites of perovskite materials, and guaranteeing long-term stability of the devices. A stabilized power conversion efficiency (PCE) of 20.3% and remarkably enhanced device longevity are achieved using the dopant free P3 with a low concentration of 5 mg/mL, qualifying the devices as one of the best PSC systems constructed based on dopant-free HTMs so far. In addition, the flexible PSCs made based on P3 also exhibit a PCE of 16.2%. This work demonstrates a promising route towards commercially viable, stable and efficient PSCs.
关键词： perovskite solar cell,good stability,conjugated polymer,dopant free,hole transport material
更新于2025-09-11 14:15:04
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Effect of Hot-Electron Injection on the Excited-State Dynamics of a Hybrid Plasmonic System Containing Poly(3-hexylthiophene)-Coated Gold Nanoparticles
摘要： We investigated the photophysical interaction between a conjugated polymer (CP) and a plasmonic gold nanoparticle (Au NP) using transient absorption spectroscopy. We prepared a hybrid system containing CP-stabilized Au NPs by reducing a Au precursor directly with a thiol-terminated poly(3-hexylthiophene) surfactant (P3HT-SH), with the unreacted P3HT-SH chains used as an organic matrix. The P3HT attached to the Au NPs plays two critical roles in our hybrid system: it suppresses exciton quenching from the P3HT matrix to Au NPs (the spacer role) and relays hot electrons induced by surface plasmon resonance of Au NPs to P3HT (the bridge role). Thus, singlet excitons are more slowly relaxed in our hybrid system than those in a neat P3HT film. Our findings may provide important information for development of the high-efficiency hybrid optoelectronic devices.
关键词： surface plasmon resonance,transient absorption spectroscopy,conjugated polymer,photophysical interaction,plasmonic gold nanoparticle,optoelectronic devices,hot-electron injection
更新于2025-09-11 14:15:04
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[IEEE 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Kyoto, Japan (2019.7.2-2019.7.5)] 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Latest Development of Soluble-OLED Material and its Application to Mid- to large-sized Panel Production
摘要： We present the latest status of soluble OLED material development based on our conjugated polymer technology. The materials are highly suitable for printing OLED panel fabrication, especially for mid- to large-sized displays. We also show the fundamentals to secure the best performance of ink-jet (IJ) printed devices. Finally we discuss the expectation for IJP-OLED panel production from a viewpoint of its process, resolution & panel size, and performance as well as the comparison with WOLED.
关键词： soluble OLED material,ink-jet printed devices,conjugated polymer technology,IJP-OLED panel production,printing OLED panel fabrication
更新于2025-09-11 14:15:04
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The Influence of Moisture on the Energy Level Alignment at the MoO <sub/>3</sub> /Organic Interfaces
摘要： MoO3 is widely used in polymer-based organic solar cells as an anode buffer layer due to its high workfunction and formation of a strong dipole at the MoO3/polymer interface facilitating the charge transfer across the MoO3/polymer interface. In the present work we show that exposure of the MoO3/polymer interface to moisture attracts water molecules to the interface via diffusion. Due to their own strong dipole water molecules counter the dipole at the MoO3/polymer interface. As a consequence, the charge transfer across the MoO3/polymer will reduce and affect the charge transport across the interface. The outcome of this work thus suggest that it is critical to keep the MoO3/polymer interface moisture free which requires special precautions in device fabrications. The composition of the MoO3/P3HT:PC61BM interface is analyzed with X-ray photoelectron spectroscopy and the depth profiling technique neutral impact collision ion scattering spectroscopy. The results show that the concentration of oxygen increases upon exposure but leave the oxidation state of the Mo unchanged. Valence electron spectroscopy technique shows that the dipole across the MoO3/P3HT:PC61BM interface decreases even for short time exposure to atmosphere due to the diffusion of water molecules to the interface. The far-ranging consequences for organic electronic devices are discussed.
关键词： exposure to air,interface,dipole formation,electron spectroscopy,metal oxide,organic photovoltaic,conjugated polymer
更新于2025-09-11 14:15:04