Solvent vapor assisted spin-coating: A simple method to directly achieve high mobility from P3HT based thin film transistors

Chang, Hao; Pengyue, Wang; Li, Haidong; Zhang, Jidong; Yan, Donghang

doi:10.1016/j.synthmet.2013.09.031

Cited by 22 publications

(7 citation statements)

References 15 publications

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“…607 nm with the applied external electric field during annealing, indicating that the external electric field caused an increase in not only the intrachain conjugated length but also the interchain π−π stacking. 55,56 In Table 5, the ratio R = A 0−0 /A 0−1 increased from 0.60 to 0.68, suggesting that the electric field increased the conjugated length and ordered degree of the 33 kg/mol P3HT chains. These results demonstrated that the low-Mw P3HT segments can arrange and pack into a more ordered structure with electric field application.…”

Section: Morphological Analysis Of the P3ht Filmsmentioning

confidence: 99%

Effect of External Electric Field on the Ordered Structure of Molecular Chains and Hole Mobility in Regioregular Poly(3-hexylthiophene) with Different Molecular Weights

Ren

Tao

et al. 2018

Langmuir

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This research investigated the effect of a highvoltage external electric field on the ordered structure of molecular chains and hole mobility in regioregular poly(3hexylthiophene) (P3HT) with different molecular weights through X-ray diffraction, atomic force microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, micro-Raman spectroscopy, UV−vis spectroscopy, photoluminescence spectroscopy, and organic fieldeffect transistors. The optimal magnitude of the external electric field was 5000 V/cm. With the optimized electric field applied to a series of P3HT films, the carrier mobility of all P3HT films increased, and the increase rate changed from 105% to 56%, closely depending on the increase in molecular weight from 33 kg/mol to 100 kg/mol. The results indicated that the increase in carrier mobility was attributed to the P3HT conformation order, which was controlled by the external electric field. Molecular weight was a critical factor in determining the P3HT conformation response to the external electric field. The external electric field orientated lower-molecular-weight (33 kg/mol) P3HT into ordered structures more obviously than higher-molecular-weight (100 kg/mol) P3HT. This research contributes to the understanding of the effect of an external electric field on the ordered structure of the chains and carrier mobility in P3HT with different molecular weights. This research also reveals the regularity and mechanism of the formation of ordered structures and essentially enhances the carrier mobility of P3HT films with different molecular weights, to fabricate photovoltaic devices with high efficiency, based on polymer physics.

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Section: Morphological Analysis Of the P3ht Filmsmentioning

confidence: 99%

Effect of External Electric Field on the Ordered Structure of Molecular Chains and Hole Mobility in Regioregular Poly(3-hexylthiophene) with Different Molecular Weights

Ren

Tao

et al. 2018

Langmuir

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“…On the other hand, because of low mobility, it is crucial to obtain layer structure with the shortest possible carrier paths and crystallization should help in this aspect, too. In our research we examined the influence of thermal [11][12][13] and solvent annealing [2,3,12,[14][15][16][17][18][19][20][21] techniques on improving optical, crystal, and electrical parameters of P3HT:PTB7 organic cells.…”

Section: Introductionmentioning

confidence: 99%

Influence of Active Layer Processing on Electrical Properties and Efficiency of Polymer-Fullerene Organic Solar Cells

et al. 2019

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New method of polymer-fullerene composite crystallization was examined as a possible way for efficiency enhancement of polymer organic solar cells. Since the structure of bulk-heterojunction is crucial for its efficiency, there is a strong need for new methods that can control a crystallization process. In this work we studied the crystallization process taking place under thermal annealing in ambient conditions, as well as annealing in a solvent atmosphere. Two polymer compounds, P3HT and PTB7, performing as donor materials were used. The acceptor material in the fabricated bulk heterojunction was [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The spin-coated layers were investigated by optical absorption and X-ray diffraction. We observed significant changes in the crystal structure of some of the annealed layers. The constructed solar cells were examined with use of current-voltage characterization method under AM1.5G sun irradiation, and by photocurrent spectroscopy. In the case of P3HT:PCBM cells significant increase of efficiency was observed, especially after annealing in solvent atmosphere.

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“…One of the most promising and intensely investigated semiconducting polymers is poly(3-hexylthiophene) (P3HT) due to its relatively high hole mobility, solubility in common organic solvents, tunable microstructure, and the ability to synthetically control regioregularity. − It has served as a model material for exploring the correlation between microstructure and FETs performance. P3HT thin films in FETs devices are typically composed of ordered crystallites embedded in disordered amorphous matrix, and charge hopping and transport are impeded by the disordered amorphous structure.…”

Section: Introductionmentioning

confidence: 99%

Improving Charge Carrier Mobility of Polymer Blend Field Effect Transistors with Majority Insulating Polymer Phase

Tan

Pan

et al. 2018

J. Phys. Chem. C

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The key approach to achieve high performance field effect transistor fabricated from semiconducting/insulating polymer blends with majority insulating polymer phase is the formation of connected fibrous structures of semiconducting polymer and good interfacial interaction of semiconducting polymer with the dielectric layer. Herein, tetrahydrofuran (THF) as a marginal solvent was used as an additive in marginal/good solvent mixtures to control the crystallite structure, phase segregation, and hole transport properties of poly(3-hexylthiophene)/poly(styrene) (P3HT/PS; weight ratio: 1/4) blends, with the advantage that marginal/good solvent mixture gives P3HT sufficient time for phase segregation and relatively better solvent quality to aggregate to more stable structures compared to other reported strategies as bad/good solvent mixtures or directly marginal solvents. Incorporation of THF reduces the P3HT solubility, forming connected fibrous structures as observed in both neat P3HT and blend films; it appears these structures are responsible for improved charge transport. Furthermore, enhanced molecular ordering, π–π stacking and conjugation length are observed with increasing THF amount. THF promotes the edge-on orientation and more stable crystal structures in P3HT, while the lattice spacing remains the same. Finally, the added THF increases hole mobility for P3HT/PS blend FETs, reaching a maximum value of 4 0.0 × 10–3 cm2/(V s) with 20 vol % THF and being comparative to neat P3HT; however, THF has an insignificant influence on the hole mobility for neat P3HT FETs. Morphological characterization supports the idea that differential solubility creates both enhanced chain ordering and vertical phase segregation that both improve FET performance. These results are promising for the development of environmentally stable and lower cost polymer electronics.

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Solvent vapor assisted spin-coating: A simple method to directly achieve high mobility from P3HT based thin film transistors

Cited by 22 publications

References 15 publications

Effect of External Electric Field on the Ordered Structure of Molecular Chains and Hole Mobility in Regioregular Poly(3-hexylthiophene) with Different Molecular Weights

Effect of External Electric Field on the Ordered Structure of Molecular Chains and Hole Mobility in Regioregular Poly(3-hexylthiophene) with Different Molecular Weights

Influence of Active Layer Processing on Electrical Properties and Efficiency of Polymer-Fullerene Organic Solar Cells

Improving Charge Carrier Mobility of Polymer Blend Field Effect Transistors with Majority Insulating Polymer Phase

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