Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-29T08:01:07.227Z Has data issue: false hasContentIssue false
  • English
  • Français

Anisotropic Charge Transport in Organic Single Crystals Based on Dipolar Molecules

Published online by Cambridge University Press:  01 February 2011

Beatrice Fraboni ,
Riccardo Di Pietro ,
Antonio Castaldini ,
Anna Cavallini ,
Alessandro Fraleoni ,
Leonardo Setti ,
Ivan Mencarelli  and
Cristina Femoni
Beatrice Fraboni
Affiliation:
[email protected], University of Bologna, Physics, viale Berti Pichat 6/2, Bologna, 40127, Italy
Riccardo Di Pietro
Affiliation:
[email protected], University of Bologna, Physics, viale Berti Pichat 6/2, Bologna, 40127, Italy
Antonio Castaldini
Affiliation:
[email protected], University of Bologna, Physics, viale Berti Pichat 6/2, Bologna, 40127, Italy
Anna Cavallini
Affiliation:
[email protected], University of Bologna, Physics, viale Berti Pichat 6/2, Bologna, 40127, Italy
Alessandro Fraleoni
Affiliation:
[email protected], University of Bologna, Industrial and Material Chemistry, Bologna, 40137, Italy
Leonardo Setti
Affiliation:
[email protected], University of Bologna, Industrial and Material Chemistry, Bologna, 40137, Italy
Ivan Mencarelli
Affiliation:
[email protected], University of Bologna, Industrial and Material Chemistry, Bologna, 40137, Italy
Cristina Femoni
Affiliation:
[email protected], University of Bologna, Physical and Inorganic Chemistry, Bologna, 40126, Italy
Get access

Abstract

We studied the anisotropic charge transport properties of solution-grown organic single crystals based on a dipolar molecule 4HCB (4-hydroxy-cyanobenzene) by electrical transport measurements, current-voltage and space charge limited current (SCLC), and by X-ray diffraction analyses.

Optical excitation differently affects the flow of charge carriers along the two main planar crystal axis, altering the charge transport anisotropy induced by the molecular π-orbitals stacking. We attribute this behaviour to the presence of an intrinsic molecular dipole and to its different orientation within the crystal lattice. The anisotropy of transport along the three crystallographic directions has been assessed by electrical characterization and correlated to the crystal molecular packing as determined by X-ray analyses.

Keywords

organicdefectsphotoconductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1091: Symposium AA – Conjugated Organic Materials–Synthesis, Structure, Device and Applications , 2008 , 1091-AA11-66
Copyright
Copyright © Materials Research Society 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Facchetti, A., Mater. Today 10, 28 (2007)Google Scholar
2. Forrest, S. R. Nature 428, 911 (2004)Google Scholar
3. Podzorov, V., Menard, E., Borissov, A., Kiryukhin, V., Rogers, J., Gershenson, M., Phys. Rev. Lett. 93, 86602 (2004)Google Scholar
4. Boer, R. de, Gershenson, M., Morpurgo, A., Podzorov, V., Phys. Status Solidi A 201, 1302 (2004)Google Scholar
5. Podzorov, V., Pudalov, V., Gershenson, M., Appl.Phys.Lett. 83, 4345 (2003)Google Scholar
6. Menard, E., Podzorov, V., Gaur, S., Gershenson, M., Rogers, J., Adv. Mater. 16, 2097 (2004)Google Scholar
7. Reese, C. and Bhao, Z.. Materials Today 10, 27 (2007)Google Scholar
8. Zeis, R., Besnard, C., Siegrist, T., Schlockermann, C., Chi, X., Kloc, C., Chem. Mater. 18, 244 (2006)Google Scholar
9. Anthony, J., Brooks, J., Eaton, D., Parkin, S. J. Am. Chem. Soc. 123 9482 (2001)Google Scholar
10. Manetta, S., Ehrensperger, M., Bosshard, C., Günter, P., C. R. Physique 3, 449 (2002)Google Scholar
11. Sankaranarayanan, K., Ramasamy, P., J. Cryst. Growth, 292, 445 (2006)Google Scholar
12. Butko, V. Y. Chi, X., Lang, D. V. Ramirez, A., Appl. Phys. Lett. 83, 4773 (2003)Google Scholar
13. Fraleoni, A., Fraboni, B., Mencarelli, I., Setti, L, Femoni, C., DiPietro, R., Cavallini, A., submittedGoogle Scholar
14. Fraboni, B., DiPietro, R. et al. , submittedGoogle Scholar
15. Boer, R. W. I. De, Klapwijk, T. M. Morpurgo, A. F. Appl. Phys. Lett. 83, 4345 (2003)Google Scholar