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Applied Physics Letters / Volume 96 / Issue 26 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 96, 263303 (2010); http://dx.doi.org/10.1063/1.3458816 (3 pages)

Intense photoluminescence from pentacene monolayers

Rui He1, Nancy G. Tassi2, Graciela B. Blanchet3, and Aron Pinczuk1,4

1Department of Physics, Columbia University, New York, New York 10027, USA
2Central Research and Development, DuPont, Wilmington, Delaware 19880, USA
3Nano-Terra, Cambridge, Massachusetts 02139, USA
4Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA

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(Received 11 March 2010; accepted 9 June 2010; published online 30 June 2010)

Sharp and intense excitonic photoluminescence is observed at low temperatures in highly uniform pentacene monolayers deposited on a compliant polymeric substrate. The free exciton (FE) emission displays characteristic intensity that grows quadratically with the number of monolayers N. The energy of the FE band redshifts with increasing N revealing impact of molecular overlap on the FE state.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

excitons, monolayers, organic semiconductors, photoluminescence, red shift, semiconductor thin films

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3458816

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(a) Left: schematic drawing of the configuration of a pentacene film grown on PAMS. The drawing is not to scale. Right: AFM image of a pentacene submonolayer film with 70% coverage (0.7 ML). (b) Photoluminescence spectra from pentacene films with different values of N. The vertical arrows mark the positions of FE bands.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Integrated intensity of FE band IFE as a function of layering. The solid curve is a fit of the data to the equation shown as a legend. The circled region is expanded in the inset. IFE of single crystal of pentacene is indicated by an arrow.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
FE energy and bandwidth as a function of the number of monolayers. The arrows label the position and width of FE band in the single crystal. The solid lines are guides to the eye. The d(001)-spacings are measured by XRD at room temperature. (For T<10 K these values are expected to decrease by 1% to 2%.) For the case of 1 ML, the spacing refers to the thickness of the first layer measured by AFM.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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