Morphology and Charge Transport in Poly(2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene) Films

Jeng, U‐Ser; Hsu, Chun‐Hua; Sheu, Hwo‐Shuenn; Lee, H. Y.; Inigo, Anto R.; Chiu, Hsiang Chih; Fann, Wunshain; Chen, S. H.; Su, An‐Chung; Lin, Tsung-Han; Peng, Kang-Yung; Chen, S. A.

doi:10.1021/ma050367u

Cited by 57 publications

(86 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[ 19 ] MEH-PPV fi lms consist of ordered nanoscale domains (aggregates) embedded in amorphous material, diode mobility varying with fi lm morphology. [20][21][22][23] PCPDTBT fi lms again consist of polycrystalline domains embedded in amorphous material. [ 24 ] Pentacene and C60 form pure polycrystalline thin fi lms.…”

Section: Introductionmentioning

confidence: 99%

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Campbell

Rawcliffe

Guite

et al. 2016

Adv Funct Materials

View full text Add to dashboard Cite

3720 wileyonlinelibrary.com (OPVs), and organic fi eld-effect transistors (OFETs). A crucial parameter in the development of these technologies is the OSC charge-carrier mobility, and how it is related to the different OSC materials, processing, device architectures, and device operating conditions. Many semiconducting polymers and small molecules are amorphous, and such disorder in the physical morphology is expected to refl ect itself in disorder of the energy levels of the hole and electron transport states ( Figure 1 a). Such energetic disorder will directly impact charge transport and mobility. [1][2][3][4][5][6][7][8][9][10][11][12] For such energetically disordered OSCs, one feature predicted by many charge transport models is a charge-carrier density dependent mobility. The original Gaussian disorder model (GDM) developed by Bässler for hopping transport in a Gaussian density of states (DOS) distribution was a single carrier approach, [ 1 ] as were the models based on it which considered both correlated energetic disorder, [ 2 ] with a smoothly varying energy landscape (see Figure 1 a), and the effect of polaronic relaxation. [ 3 ] The percolation model developed by Vissenberg and Matters for transport involving an exponential DOS instead considered multiple carriers, [ 4 ] and this predicted a mobility which has a power-law dependency on the charge-carrier density. The measured transistor mobility falls two to three orders of magnitude below that predicted from the charge-carrier density dependent model, and does not follow the expected power-law relationship. The experimental results for these two amorphous polymers are therefore consistent with a charge-carrier density independent mobility, and this is discussed in terms of polaron-dominated hopping and interchain correlated disorder.

show abstract

Section: Introductionmentioning

confidence: 99%

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Campbell

Rawcliffe

Guite

et al. 2016

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Thus, inhomogeneity in the arrangement of micro domain regions may be a limiting factor for the non-dispersive transport. This conclusion is supported by the observation of the dispersive hole transient, in the case of annealed films, which is an extreme case of inhomogeneous distribution of aggregated and non-aggregated regions [19]. Thus, these inhomogeneities in the film structure may lead to an overall increase in the level of position disorder and affect the type of transport i.e.…”

Section: Discussionmentioning

confidence: 65%

“…In the present case, it appears that the charge carriers may have to move/transfer against the field direction due to an absence of preferentially oriented domains towards the surface normal in MEH-PPV:COOH-MWCNT composites [19,16]. The electron current transients were highly dispersive and the transient time was not detectable even on a log-log scale [26].…”

Section: Discussionmentioning

confidence: 73%

See 1 more Smart Citation

Dispersive hole transport in polymer:carbon nanotube composites

Inigo¹,

Henley²,

Silva³

2011

Nanotechnology

View full text Add to dashboard Cite

The hole transport properties of poly(2-methoxy, 5-(2`-ethyl-hexoxy)-p-phenylene vinylene) (MEH-PPV) blended with acid oxidized multiwall carbon nanotubes (COOH-MWCNT) were investigated in a diode configuration using the time-of-flight (TOF) photocurrent method. While the room temperature hole mobility in pure MEH-PPV films was non-dispersive with positive field dependent mobility, MEH-PPV:COOH-MWCNT blended devices exhibited dispersive transport and negative field dependent mobility. This indicates that the hole mobility in this composite is influenced by positional disorder caused by the presence of COOH-MWCNT in the MEH-PPV matrix. These results strongly suggest that a uniform distribution of COOH-MWCNT or other inorganic hybrid materials in the organic matrix is important for charge transport in the high mobility nanotubes component to be activated, when used in hybrid or as a substitute to replace lower mobility organic components.

show abstract

“…Based on these extensive investigations we propose a structural model for drop-cast (mm thick films) and spin cast (nm thick films) in Fig. 11 29 and Fig. 12.…”

Section: Structurementioning

confidence: 99%

Review of Morphology Dependent Charge Carrier Mobility in MEH‐PPV

Inigo

Huang

White

et al. 2010

J Chinese Chemical Soc

Self Cite

View full text Add to dashboard Cite

Charge carrier mobility in poly(2-methoxy,5(2¢-ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) films were measured as a function of temperature and electric field parallel and perpendicular to the substrate for devices prepared from different solvents and under different processing conditions. Bulk structural morphology was characterized by various X-ray diffraction measurements such as wide angle, small angle and X-ray reflection. Surface morphology was characterized using various scanning probe microscopic techniques. Mobilities were found to follow Gaussian disorder model (GDM) and to be highly anisotropic not only depending on the solvents used but also on the film preparation method such as spin-coating or drop-casting. While no direct correlation was found between charge carrier mobility and photoluminescence, charge transport parameters were correlated with structural morphology.

show abstract

Morphology and Charge Transport in Poly(2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene) Films

Cited by 57 publications

References 39 publications

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Dispersive hole transport in polymer:carbon nanotube composites

Review of Morphology Dependent Charge Carrier Mobility in MEH‐PPV

Contact Info

Product

Resources

About