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Applied Physics Letters / Volume 100 / Issue 3 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 100, 033302 (2012); http://dx.doi.org/10.1063/1.3678603 (3 pages)

Morphological control of hybrid polymer-quantum dot solar cells with electron acceptor ligands

Mathieu Boivin1, Sébastien Lamarre1, Jonathan Tessier1, Marie-Ève Lecavalier1, Ahmed Najari2, Sophie Dufour-Beauséjour1, Evelyne Brown Dussault1, Pierre Collin1, and Claudine Nì. Allen1

1Centre d’optique, photonique et laser (COPL), Département de physique, de génie physique et d’optique, Université Laval, 2375 rue de la Terrasse, Québec, G1V 0A6, Canada
2Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, G1V 0A6, Canada

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(Received 3 October 2011; accepted 4 January 2012; published online 20 January 2012)

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.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

adsorption, cadmium compounds, carrier mobility, colloids, II-VI semiconductors, organic-inorganic hybrid materials, polymers, semiconductor quantum dots, solar cells

PACS

International Patent Classification (IPC)

  • H01L27/142

    Energy conversion devices

  • H01L31/04

    Adapted as conversion devices

  • H02N6/00

    Generators in which light radiation is directly converted into electrical energy

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3678603

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
(Color online) (a) Current density-voltage (J-V) curves of P3HT-cQD solar cells without (black line) and with F4TCNQ (red dashed line) under AM1.5G illumination. The blue markers indicate the operating points with the highest PCE. AFM images of active layers having F4TCNQ:cQDs weight ratios of (b) 0%, (c) 0.63%, and (d) 1.25%.

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

FIG.2
(Color online) The mean surface roughness (black dots) and the box plot of PCE distributions (red) are shown for different F4TCNQ concentrations, with the later ratio relative to the 0% F4TCNQ leftmost data. The distributions were obtained from 14, 3, 5, 7, and 5 solar cells for each dataset respectively from left to right, with black error bars giving the standard deviation of the surface roughness while the red dashed line goes through the mean PCE value. For each distribution, the mean Jsc is 2.0 ± 0.9 mA/cm2, 3.0 ± 0.3 mA/cm2, 2.2 ± 0.7 mA/cm2, 2.7 ± 1.4 mA/cm2, and 1.6 ± 0.3 mA/cm2, respectively.

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

FIG.3
(Color online) (a) ATR-FTIR spectra of (1) F4TCNQ powder, (2) cQD-F4TCNQ solid film, (3) P3HT-F4TCNQ solid film, and (4) P3HT-cQD-F4TCNQ solid film. (b) Absorption spectrum of the cQD-F4TCNQ blend (sample 2) in a dichlorobenzene solution.

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



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