Molecular characterization of poly(3-hexylthiophene)

Heffner, Glenn W.; Pearson, Dale S.

doi:10.1021/ma00023a035

Cited by 160 publications

(188 citation statements)

References 6 publications

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“…We also observe a slight decrease of the specific viscosity of the solution from 0.52 to 0.40 after treating the solution (Figure 1b), confirming a reduction of the chain entanglements in solution. These results, combined with prior analysis by dynamic light scattering, 13,47 paint the pictures of the pristine and disentangled solutions illustrated in …”

Section: Polymer Entanglement and Pre-aggregation In Solutionmentioning

confidence: 93%

Carrier Transport Enhancement in Conjugated Polymers through Interfacial Self-Assembly of Solution-State Aggregates

Khan

et al. 2016

ACS Appl. Mater. Interfaces

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ABSTRACT:We demonstrate that local and long range orders of poly(3-hexylthiophene) (P3HT) semicrystalline films can be synergistically improved by combining chemical functionalization of the substrate with solution-state disentanglement and pre-aggregation of P3HT in a theta solvent, leading to a very significant enhancement of the field effect carrier mobility. The pre-aggregation and surface functionalization effects combine to enhance the carrier mobility nearly 100-fold as compared with standard film preparation by spin-coating, and nearly 10-fold increase over the benefits of pre-aggregation alone. In situ quartz crystal microbalance with dissipation (QCM-D) experiments reveal enhanced deposition of pre-aggregates on surfaces modified with an alkyl-terminated self-assembled monolayer (SAM) in comparison to un-aggregated polymer chains.Additional investigations reveal the combined pre-aggregation and surface functionalization significantly enhances local order of the conjugated polymer through planarization and extension of the conjugated backbone of the polymer which clearly translate to significant improvements of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 carrier transport at the semiconductor-dielectric interface in organic thin film transistors. This study points to opportunities in combining complementary routes, such as well-known pre-aggregation with substrate chemical functionalization, to enhance the polymer self-assembly and improve its interfacial order with benefits for transport properties.

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Section: Polymer Entanglement and Pre-aggregation In Solutionmentioning

confidence: 93%

Carrier Transport Enhancement in Conjugated Polymers through Interfacial Self-Assembly of Solution-State Aggregates

Khan

et al. 2016

ACS Appl. Mater. Interfaces

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“…If P3HT is deposited by spin-coating, the best solvent is chloroform, due to its rapid evaporation which limits crystallization during the spin-coating process [79,80]; this impose a thermal post-treatment process able to favor crystallization and π−π stacking of the P3HT backbone. It has been shown that this results in a lamellar structure formed by interchain stacking ( Figure 5).…”

Section: Poly(3-hexylthiophene) (P3ht)mentioning

confidence: 99%

Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

2016

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Electrolyte-gated organic field-effect transistors have emerged in the field of biosensors over the last five years, due to their attractive simplicity and high sensitivity to interfacial changes, both on the gate/electrolyte and semiconductor/electrolyte interfaces, where a target-specific bioreceptor can be immobilized. This article reviews the recent literature concerning biosensing with such transistors, gives clues to understanding the basic principles under which electrolyte-gated organic field-effect transistors work, and details the transduction mechanisms that were investigated to convert a receptor/target association into a change in drain current.

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“…ASTRA V software, version 5.3.4.16 (Wyatt Technology), was used for data analysis. The values of the refractive index increment, dn/dc, using THF as the mobile phase were determined after injecting a known amount of polymer: PMMA dn/dc = 0.088 [31], P3HT dn/dc = 0.285 [32], and MEH-PPV dn/dc = 0.293; when possible, these values have been confirmed from the literature. GPC samples were measured within one day after removal from vacuum.…”

Section: Methodsmentioning

confidence: 85%

Effects of Emulsion-Based Resonant Infrared Matrix Assisted Pulsed Laser Evaporation (RIR-MAPLE) on the Molecular Weight of Polymers

2012

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Abstract:The molecular weight of a polymer determines key optoelectronic device characteristics, such as internal morphology and charge transport. Therefore, it is important to ensure that polymer deposition techniques do not significantly alter the native polymer molecular weight. This work addresses polymers deposited by resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE). By using a novel emulsion-based target technique, the deposition of smooth, contiguous films with no evidence of chemical degradation have been enabled. However, structural degradation via a reduction in molecular weight remains an open question. The common polymer standard, PMMA, and the optoelectronic polymers, P3HT and MEH-PPV, have been characterized before and after emulsion-based RIR-MAPLE deposition via gel permeation chromatography to determine if RIR-MAPLE affects the deposited polymer molecular weight. Proton nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy measurements have also been conducted to verify the absence of chemical degradation. These measurements verify that there is no chemical degradation of the polymers, and that PMMA and P3HT show no structural degradation, but MEH-PPV exhibits a halving of the weight-averaged molecular weight after RIR-MAPLE deposition. Compared with competing laser deposition techniques, RIR-MAPLE is shown to have the least effect on the molecular weight of the resulting thin films. OPEN ACCESSPolymers 2012, 4 342

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Molecular characterization of poly(3-hexylthiophene)

Cited by 160 publications

References 6 publications

Carrier Transport Enhancement in Conjugated Polymers through Interfacial Self-Assembly of Solution-State Aggregates

Carrier Transport Enhancement in Conjugated Polymers through Interfacial Self-Assembly of Solution-State Aggregates

Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

Effects of Emulsion-Based Resonant Infrared Matrix Assisted Pulsed Laser Evaporation (RIR-MAPLE) on the Molecular Weight of Polymers

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