Thickness effects on the optical properties of layer-by-layer poly(p-phenylene vinylene) thin films and their use in energy-modulated structures

Multilayer nanostructural thin films through a layer-by-layer spin self-assembly method were prepared using poly(p-phenylene vinylene)/montmorillonite. Sodium montmorillonite particles exfoliated into single sheets and cationic PPV precursor and such anionic MMT plates were spin self-assembled by electrostatic attraction. Self-assembled MMT layers blocked the penetration of oxygen and moisture and they reduced the photo-oxidation of the emitting material. Spin self-assembled films showed higher environmental stability and luminescence, and their PL spectra were somewhat different from that of bulk PPV films.

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Electrical and optical properties of thin films based on poly [2-methoxy-5 (2′-ethyl hexyloxy)-1,4-phenylene vinylene] doped with acridine orange dye with possible photovoltaic applications

Solar Energy Materials and Solar Cells ◽

10.1016/j.solmat.2007.03.021 ◽

2007 ◽

Vol 91 (15-16) ◽

pp. 1462-1466 ◽

Cited By ~ 8

Author(s):

Samrana Kazim ◽

M. Zulfequar ◽

M. Mazharul Haq ◽

P.K. Bhatnagar ◽

M. Husain

Keyword(s):

Thin Films ◽

Optical Properties ◽

Acridine Orange ◽

Phenylene Vinylene ◽

Electrical And Optical Properties ◽

Photovoltaic Applications

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Poly- and Oligoaniline Thin Films: Charge Transport, Optical Properties and Effect of Doping

MRS Proceedings ◽

10.1557/proc-413-517 ◽

1995 ◽

Vol 413 ◽

Cited By ~ 1

Author(s):

J. Paloheimo ◽

A. J. Pal ◽

H. Stubb ◽

P. Granholm ◽

H. Isotalo

Keyword(s):

Thin Films ◽

Optical Properties ◽

Layer By Layer ◽

Variable Range Hopping ◽

Coulomb Interactions ◽

Optical Studies ◽

Absorption Bands ◽

Electrical And Optical Properties ◽

Lb Films ◽

Langmuir Blodgett

ABSTRACTWe report a study of the electrical and optical properties of thin films of tetraanilinobenzene (TAB) and polyaniline (PANI) deposited using the Langmuir-Blodgett (LB), layer-by-layer selfassembly and vacuum-evaporation techniques. The paper will mainly concentrate on TAB LB films, but also results for other films are presented for comparison. The optical studies of undoped TAB LB films indicate H-aggregates. Upon doping new polaronic absorption bands appear and the photoluminescence of TAB becomes quenched. Doped LB and self-assembled films can reach conductivities up to about 10−4/cm for TAB and a few S/cm for PANT. The conductivity has a temperature dependence logσ α T−1/2, suggesting variable-range hopping in a quasi-gap, possibly due to the Coulomb interactions between localized carriers.

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Physical Properties of MEH-PPV Thin Films at Different Ageing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1109.534 ◽

2015 ◽

Vol 1109 ◽

pp. 534-538

Author(s):

Najwa Ezira Ahmed Azhar ◽

A.K.S. Shafura ◽

Irma Hidayanti Halim Affendi ◽

Shafinaz Sobihana Shariffudin ◽

Mohamad Rusop

Keyword(s):

Thin Films ◽

Optical Properties ◽

Spin Coating ◽

Ageing Time ◽

Toluene Solution ◽

Band Gaps ◽

Phenylene Vinylene ◽

Electrical And Optical Properties ◽

Uv Visible ◽

Atom Force Microscope

Poly (2-methoxy-5(2’-ethylhexyloxy)-phenylene vinylene) (MEH-PPV) thin films were deposited by spin-coating technique. The MEH-PPV powders were dissolved in toluene solution. In this study, we report the effect of ageing on electrical and optical properties MEH-PPV thin films. The thickness of MEH-PPV increased as ageing time increased. The electrical properties were obtained using 2-point probe. The resistivity of thin films decreased as ageing time increased and vice versa with conductivity. The optical properties were investigated using UV-Visible-NIR (UV-VIS-NIR) and atom force microscope (AFM). From UV-Vis result shows the lower band gaps of films in toluene solution proved MEH-PPV has longer conjugation segments. The surface roughness of thin films decreased with the increased of ageing time; which is caused by the aggregation of the MEH-PPV. The PL spectra show the quenching of emission might be due to the conjugation of length polymer changes in different ageing times.

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