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16 Jan 2012

Volume 100, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 100, 033109 (2012); http://dx.doi.org/10.1063/1.3664636 (3 pages)

Sang H. Yun, Hyung-Seok Lee, Young Ha Kwon, Mats Göthelid, Sang Mo Koo, Lars Wågberg, Ulf O. Karlsson, and Jan Linnros
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The influence of gate dielectrics on a high-mobility n-type conjugated polymer in organic thin-film transistors

Jinhua Li, Jun Du, Jianbin Xu, Helen L. W. Chan, and Feng Yan

Appl. Phys. Lett. 100, 033301 (2012); http://dx.doi.org/10.1063/1.3678196 (4 pages) | Cited 7 times

Online Publication Date: 18 January 2012

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Organic thin-film transistors based on a high mobility n-type semiconductor 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) and different polymer gate dielectrics are fabricated. The average electron mobility decreases from 0.76 to 0.08 cm2/Vs with the increase of the gate dielectric constant from 2.6 to 7.8. The P(NDI2OD-T2) film shows unconventional face-on molecular packing, which results in short distances and pronounced interactions between electrons and gate dielectric. Therefore, the decrease of the electron mobility with the increasing dielectric constant is attributed to the Fröhlich polaron effect for the interaction between electrons in the channel and ionic polarization cloud in the gate dielectric.
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85.30.Tv Field effect devices
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Morphological control of hybrid polymer-quantum dot solar cells with electron acceptor ligands

Mathieu Boivin, Sébastien Lamarre, Jonathan Tessier, Marie-Ève Lecavalier, Ahmed Najari, Sophie Dufour-Beauséjour, Evelyne Brown Dussault, Pierre Collin, and Claudine Nì. Allen

Appl. Phys. Lett. 100, 033302 (2012); http://dx.doi.org/10.1063/1.3678603 (3 pages) | Cited 1 time

Online Publication Date: 20 January 2012

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We integrate the electro-attractive conjugated molecule tetrafluoro-tetracyano-quinodimethane (F4TCNQ) in the active layer of polymer-CdSe colloidal quantum dot (cQD) solar cells. The addition of this molecule enhances cQD dispersion inside the polymer. In tuning its concentration, we can optimize the active layer morphology for charge separation and transport. A smoother morphology is likely the result of polymer chain adsorption on cQDs via F4TCNQ which increases the steric barrier between cQDs. Our most optimized device has a F4TCNQ:cQDs weight ratio of 0.5% improving the power conversion efficiency by a factor ∼2.3.
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88.40.H- Solar cells (photovoltaics)
88.40.J- Types of solar cells
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