Unexpectedly high field-effect mobility of a soluble, low molecular weight oligoquaterthiophene fraction with low polydispersity

Pingel, Patrick; Zen, Achmad; Neher, Dieter; Lieberwirth, Ingo; Wegner, Gerhard; Allard, Sybille; Scherf, Ullrich

doi:10.1007/s00339-008-4994-0

Cited by 39 publications

(54 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two types of TEM images are generally used: bright field (BF) images that are obtained from intensities of transmitted electrons that undergo no scattering with the sample, and dark field (DF) images that are formed by electrons scattered mostly at crystalline domains. Because of this feature, DF images can be used for the identification of nanometer-size crystalline domains in conducting and semiconducting polymers [27,[81][82][83].…”

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

“…Eventually, this paradox was related to the difference in inhomogeneity and the nanoscale structural organization of materials with low and high MW and has become one of the manifestations of the importance of the inhomogeneity factor in establishing the performance of organic materials. Very recently, the importance of a related factor, the polydispersity index (PI), which characterizes the range of MWs found in a given polymer sample, has started to be recognized [22,27,40,41].…”

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

“…In addition to the average MW, the importance of another factor, the polydispersity index (PI), has started to be recognized [22,27,40,41]. The PI characterizes the range of MWs that are present in a polymer sample.…”

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

“…One way of achieving this is to prepare a polymer in which not every thiophene ring bears a side chain. Two examples of such polymers are poly(4,4 00 -dioctyl-2,2 0 :5 0 ,2 00 -terthiophene) (PDOTT) [22] and poly(3,3 000 -dialkylquaterthiophene)s (PQT) [23][24][25][26][27], which have two alkyl-substituted thiophene rings flanking one (PDOTT) or two (PQT) nonsubstituted rings. These polymers show excellent charge-carrier mobilities that are generally higher than those found with regio-regular P3HT.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Pailleret

Semenikhin

2010

Nanostructured Conductive Polymers

View full text Add to dashboard Cite

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

Section: Studies Of Local Crystallinitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Pailleret

Semenikhin

2010

Nanostructured Conductive Polymers

View full text Add to dashboard Cite

“…To alleviate these problems, side chains were, very often, added to improve solubility by distorting the molecular conjugation as a result. For example, in PQT-12, the presence of solubilizing side chains on the first and fourth thiophene rings [121][122][123] leaving two thiophenes without side chains created a slight twist in the molecular chain that did not disturb the conjugation much but otherwise created a larger band-gap, making it very stable under ambient conditions while still retaining higher mobility. Such stable PQT-12 films exhibited mobility of 0.07 to 0.18 cm 2 /Vs.…”

Section: Materials Selection Criteria For Os Devicesmentioning

confidence: 99%

Organic semiconductors for device applications: current trends and future prospects

Ahmad

2014

Journal of Polymer Engineering

View full text Add to dashboard Cite

Abstract:With the rich experience of developing silicon devices over a period of the last six decades, it is easy to assess the suitability of a new material for device applications by examining charge carrier injection, transport, and extraction across a practically realizable architecture; surface passivation; and packaging and reliability issues besides the feasibility of preparing mechanically robust wafer/substrate of single-crystal or polycrystalline/ amorphous thin films. For material preparation, parameters such as purification of constituent materials, crystal growth, and thin-film deposition with minimum defects/ disorders are equally important. Further, it is relevant to know whether conventional semiconductor processes, already known, would be useable directly or would require completely new technologies. Having found a likely candidate after such a screening, it would be necessary to identify a specific area of application against an existing list of materials available with special reference to cost reduction considerations in large-scale production. Various families of organic semiconductors are reviewed here, especially with the objective of using them in niche areas of large-area electronic displays, flexible organic electronics, and organic photovoltaic solar cells. While doing so, it appears feasible to improve mobility and stability by adjusting π-conjugation and modifying the energy bandgap. Higher conductivity nanocomposites, formed by blending with chemically conjugated C-allotropes and metal nanoparticles, open exciting methods of designing flexible contact/interconnects for organic and flexible electronics as can be seen from the discussion included here.

show abstract

High‐Resolution Near‐Field Optical Investigation of Crystalline Domains in Oligomeric PQT‐12 Thin Films

Kuehn

Pingel

Breusing

et al. 2011

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

The structure and morphology on different length scales dictate both the electrical and optical properties of organic semiconductor thin fi lms. Using a combination of spectroscopic methods, including scanning near-fi eld optical microscopy, we study the domain structure and packing quality of highly crystalline thin fi lms of oligomeric PQT-12 with 100 nanometer spatial resolution. The pronounced optical anisotropy of these layers measured by polarized light microscopy facilitates the identifi cation of regions with uniform molecular orientation. We fi nd that a hierarchical order on three different length scales exists in these layers, made up of distinct well-ordered dichroic areas at the ten-micrometer-scale, which are sub-divided into domains with different molecular in-plane orientation. These serve as a template for the formation of smaller needle-like crystallites at the layer surface. A high degree of crystalline order is believed to be the cause of the rather high fi eld-effect mobility of these layers of 10 − 3 cm 2 V − 1 s − 1 , whereas it is limited by the presence of domain boundaries at macroscopic distances.

show abstract

Unexpectedly high field-effect mobility of a soluble, low molecular weight oligoquaterthiophene fraction with low polydispersity

Cited by 39 publications

References 21 publications

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Organic semiconductors for device applications: current trends and future prospects

High‐Resolution Near‐Field Optical Investigation of Crystalline Domains in Oligomeric PQT‐12 Thin Films

Contact Info

Product

Resources

About