Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-29T07:41:19.110Z Has data issue: false hasContentIssue false
  • English
  • Français

Organic Solar Cells Based on Evaporated Planar and Bulk Heterojunctions of a PPVpentamer and C60

Published online by Cambridge University Press:  15 March 2011

W. Geens ,
T. Aernouts ,
J. Poortmans  and
G. Hadziioannou
W. Geens
Affiliation:
IMEC vzw, Kapeldreef 75, B-3001 Leuven, Belgium
T. Aernouts
Affiliation:
IMEC vzw, Kapeldreef 75, B-3001 Leuven, Belgium
J. Poortmans
Affiliation:
IMEC vzw, Kapeldreef 75, B-3001 Leuven, Belgium
G. Hadziioannou
Affiliation:
Department of Polymer Chemistry and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Get access

Abstract

The technique of vacuum evaporation has been applied to deposit organic photovoltaic active layers. The five-ring PPV-type oligomer 2-methoxy-5-(2'-ethylhexyloxy)-1,4-bis((4',4”-bisstyryl)styrylbenzene) (MEH-OPV5) and C60 act as respectively donor and acceptor materials in planar heterojunction (MEH-OPV5/C60) and bulk heterojunction (MEH-OPV5:C60) devices. These devices were fabricated with ITO/PEDOT:PSS bottom electrodes and Al top contacts. The performance of both solar cell configurations has been compared. It was found that under AM1.5 illumination the MEH-OPV5/C60 cells exhibit a higher open-circuit voltage (∼ 1.00 V) than the MEH-OPV5:C60 devices (∼ 0.92 V). On the other hand, the limited exciton diffusion length in these materials was reflected in the lower short-circuit current density of the planar heterojunction cells as compared to the bulk heterojunction structures. Overall AM1.5 power conversion efficiencies reaching 2 % are reported. Also the influence of the organic layer thickness and the substrate temperature during deposition on the device performance has been addressed. Thick organic films generally induce a high series resistance that limits both the short-circuit current density and the fill factor. An elevated substrate temperature during deposition of the MEH-OPV5:C60 layers onto ITO/PEDOT:PSS led to the formation of nucleated islands of 100 - 150 nm diameter with holes in between. As a result, no reliable photovoltaic devices could be realized with such organic films. AFM analysis and spectral response measurements supported these findings.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB9.3
Copyright
Copyright © Materials Research Society 2002

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

REFERENCES

1. Shaheen, S. E., Brabec, C. J., Sariciftci, N. S., Padinger, F., Fromherz, T., Hummelen, J. C., Appl. Phys. Lett. 78, 841 (2001).Google Scholar
2. Munters, T., Brabec, C. J., Martens, T., Goris, L., Vrindts, V., Manca, J., Lutsen, L., Ceuninck, W. De, Saricftci, N. S., Vanderzande, D., Schepper, L. De, and Gelan, J., presented at the E-MRS 2001, accepted for publication in Thin Solid Films.Google Scholar
3. Padinger, F., Brabec, C. J., Fromherz, T., Hummelen, J. C., and Sariciftci, N. S., Opto-Electr. 8, 280 (2000).Google Scholar
4. Shaheen, S. E., Radspinner, R., Peyghambarian, N., and Jabbour, G. E., Appl. Phys. Lett. 79, 2996 (2001).Google Scholar
5. Brabec, C. J., Cravino, A., Meissner, D., Sariciftci, N. S., Fromherz, T., Rispens, M. T., Sanchez, L., and Hummelen, J. C., Adv. Funct. Mater. 11, 374 (2001).Google Scholar
6. Katz, E. A., Faiman, D., Tuladhar, S. M., Kroon, J. M., Wienk, M. M., Fromherz, T., Padinger, F., Brabec, C. J., and Sariciftci, N. S., J. Appl. Phys. 90, 5343 (2001).Google Scholar
7. Geens, W., Poortmans, J., Shaheen, S. E., Brabec, C. J., Sariciftci, N. S., and Wessling, B., submitted to J. Appl. Phys. Google Scholar
8. Geens, W., Shaheen, S. E., Brabec, C. J., Poortmans, J., and Sariciftci, N. S., in Electronic Properties of Novel Materials: Molecular Nanostructures, edited by Kuzmany, H., Fink, J., Mehring, M., and Roth, S. (American Institute of Physics, New York, 2000) Vol. 544, pp. 516–520.Google Scholar
9. Martens, T., D'Haen, J., Munters, T., Goris, L., Beelen, Z., Manca, J., D'Olieslaeger, M., Vanderzande, D., Schepper, L. De, and Andriessen, R., submitted to Adv. Mater. Google Scholar
10. Ouali, L., Krasnikov, V. V., Stalmach, U., Hadziioannou, G., Adv. Mater. 11, 1515 (1999).Google Scholar
11. Brabec, C. J., Sariciftci, N. S., and Hummelen, J. C., Adv. Funct. Mater. 11, 15 (2001).Google Scholar
12. Veenstra, S. C., Stalmach, U., Krasnikov, V. V., Hadziioannou, G., Jonkman, H. T., Heeres, A., and Sawatzky, G. A., Appl. Phys. Lett. 76, 2253 (2000).Google Scholar
13. Geens, W., Aernouts, T., Poortmans, J., and Hadziioannou, G., presented at the E-MRS 2001, accepted for publication in Thin Solid Films.Google Scholar