Unconventional Face‐On Texture and Exceptional In‐Plane Order of a High Mobility n‐Type Polymer

Rivnay, Jonathan; Toney, Michael F.; Zheng, Yan; Kauvar, Isaac; Chen, Zhihua; Wagner, Veit; Facchetti, Antonio; Salleo, Alberto

doi:10.1002/adma.201001202

Cited by 357 publications

(527 citation statements)

References 31 publications

Supporting

Mentioning

445

Contrasting

Order By: Relevance

“…The devices with edge-on orientations have a better mobility than those with face-on orientations in examples like P3HT and pBTTT et al [59,64,65]. For high-mobility face-on devices, the origin may be that carriers can successfully overcome barrier near dielectric interface by hopping to at least subsequent 2-3 layers coupled by out-of-plane π-π interaction to achieve a three-dimensional transport [63].…”

Section: Crystallinity and Crystallite Alignmentmentioning

confidence: 99%

“…Meanwhile, slow evaporation of solution in CS 2 [60], CS 2 vapor annealing [61], vapor-assisted imprinting [57] and thermal nano-imprinting [62] have been employed to acquire flat-on molecular orientations in P3AT films. For FETs, although some donor-acceptor copolymers such as poly(diketo pyrrolo-pyrrole-co-thiophene) (PDPP-T) and poly{[N,N9-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)} [P(NDI2OD-T2)] display high mobility in spite of a mainly face-on orientation [37,63], the edge-on molecular orientation of chains respect to substrates is favored for most conjugated polymers because of the in-plane π-π pathways wanted by device architecture. The devices with edge-on orientations have a better mobility than those with face-on orientations in examples like P3HT and pBTTT et al [59,64,65].…”

Section: Crystallinity and Crystallite Alignmentmentioning

confidence: 99%

See 1 more Smart Citation

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Wang

et al. 2013

Polymers

View full text Add to dashboard Cite

Abstract:The morphological and structural features of the conjugated polymer films play an important role in the charge transport and the final performance of organic optoelectronics devices [such as organic thin-film transistor (OTFT) and organic photovoltaic cell (OPV), etc.] in terms of crystallinity, packing of polymer chains and connection between crystal domains. This review will discuss how the conjugated polymer solidify into, for instance, thin-film structures, and how to control the molecular arrangement of such functional polymer architectures by controlling the polymer chain rigidity, polymer solution aggregation, suitable processing procedures, etc. These basic elements in intrinsic properties and processing strategy described here would be helpful to understand the correlation between morphology and charge transport properties and guide the preparation of efficient functional conjugated polymer films correspondingly.

show abstract

Section: Crystallinity and Crystallite Alignmentmentioning

confidence: 99%

Section: Crystallinity and Crystallite Alignmentmentioning

confidence: 99%

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Wang

et al. 2013

Polymers

View full text Add to dashboard Cite

show abstract

“…Indeed, a detailed characterization of this polymer reveals a rather unique solid-state microstructure displaying the simultaneous presence of disordered phases and highly interconnected, fiber-like ordered phases, where the polymer backbones lay preferentially faceon with respect to the substrate (12) and characterized by a dihedral angle between the NDI and thiophene units (13). Whereas a face-on orientation is observed in the bulk of the film, a more edge-on orientation is revealed at the film surface (14,15).…”

mentioning

confidence: 99%

Experimental evidence that short-range intermolecular aggregation is sufficient for efficient charge transport in conjugated polymers

Wang

Fabiano

Himmelberger

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

178

204

View full text Add to dashboard Cite

Efficiency, current throughput, and speed of electronic devices are to a great extent dictated by charge carrier mobility. The classic approach to impart high carrier mobility to polymeric semiconductors has often relied on the assumption that extensive order and crystallinity are needed. Recently, however, this assumption has been challenged, because high mobility has been reported for semiconducting polymers that exhibit a surprisingly low degree of order. Here, we show that semiconducting polymers can be confined into weakly ordered fibers within an inert polymer matrix without affecting their charge transport properties. In these conditions, the semiconducting polymer chains are inhibited from attaining longrange order in the π-stacking or alkyl-stacking directions, as demonstrated from the absence of significant X-ray diffraction intensity corresponding to these crystallographic directions, yet still remain extended along the backbone direction and aggregate on a local length scale. As a result, the polymer films maintain high mobility even at very low concentrations. Our findings provide a simple picture that clarifies the role of local order and connectivity of domains.organic electronics | conjugated polymers | aggregation | charge transport C onjugated polymers have received significant scientific attention as the active material in devices for printed and flexible organic electronics (1, 2). Owing to their versatile chemical synthesis, inexpensive processability from solution, and unique mechanical flexibility, these materials are in fact promising for a vast array of devices in future low-cost and distributed technologies, such as integrated systems for electronic labels targeting safety, security, and surveillance applications (3). The rational design of new organic semiconductors has been guided by a thorough investigation of their limitations in charge transport, leading to the development of high-performance materials for next-generation electronic applications such as low-cost displays, solar cells, sensors, and logic circuits (4, 5). For more than a decade research has primarily focused on increasing the long-range order and the crystallinity of conjugated polymers as a strategy to improve the solid-state charge transport properties. As a result, the charge carrier mobility has increased by several orders of magnitude through the design and synthesis of highly ordered polymers. However, recent studies have suggested that the key to designing high-mobility polymers is not to increase their crystallinity but rather to improve their tolerance for disorder by allowing more efficient intra-and intermolecular charge transport pathways (6). This observation explains why mobility values obtained from recently designed seemingly disordered organic semiconductors often exceed those of polymers having a high degree of crystallinity (∼1 cm 2 ·V -1 ·s -1 ) (7-10). Indeed, polymers may exhibit little longrange order, as measured by X-ray diffraction (XRD), and yet display a remarkable degree of short-range or...

show abstract

“…This is consistent with previous reports of the influence of long range order on charge transport, 20 and semicrystalline face-on p-stacking in P(NDI2OD-T2). 21,22 OFETs were biased in the transdiode regime (V DS ¼ V GS ) and a frequency modulated voltage v GS (f) superimposed on the DC gate bias. 6 By measuring the decoupled AC component of the current at both source and drain electrodes (i …”

mentioning

confidence: 99%

Self-aligned organic field-effect transistors on plastic with picofarad overlap capacitances and megahertz operating frequencies

Higgins

Muir

Dell’Erba

et al. 2016

Applied Physics Letters

View full text Add to dashboard Cite

Using a combination of nanoimprint lithography, gate-source/drain self-alignment, and gravure and inkjet printing, we fabricate organic field-effect transistors on flexible plastic substrates with gate-source and gate-drain electrode overlap capacitances of COL < 1 pF, equivalent to channel-width normalised capacitances of C*OL = 0.15–0.23 pF mm−1. We compare photopatterned and nanoimprint lithography patterned channels of L ≈ 3.8 μm and L ≈ 800 nm, respectively. The reduction in L was found on average to result in order of magnitude greater switching frequencies. Gravure printing the dielectric (versus photo-patterning) was found to yield an order of magnitude lower overlap capacitance C*OL = 0.03 pF mm−1, at the expense of greater processing variation. Inkjet printed p- and n-type polymeric organic semiconductors were used to fabricate organic-field effect transistors with a peak cutoff frequencies of fS = 9.0 ± 0.3 MHz at VGS = 30 V, and transition frequencies of fT = 3.3 ± 0.2 MHz at VGS = 30 V.

show abstract

Unconventional Face‐On Texture and Exceptional In‐Plane Order of a High Mobility n‐Type Polymer

Cited by 357 publications

References 31 publications

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Experimental evidence that short-range intermolecular aggregation is sufficient for efficient charge transport in conjugated polymers

Self-aligned organic field-effect transistors on plastic with picofarad overlap capacitances and megahertz operating frequencies

Contact Info

Product

Resources

About