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Proceedings Paper

Extraction of photo-generated charge carriers from polymer-fullerene bulk heterojunction solar cells
Author(s): L. Jan Anton Koster; Valentin D. Mihailetchi; Paul W. M. Blom
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Paper Abstract

Two models describing charge extraction from insulators have been used to interpret the experimental photocurrent data of 20:80 wt% blends of poly(2-methoxy-5-(3`,7`-dimethyloctyloxy)-p-phenylene vinylene) (MDMO-PPV) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) bulk heterojunction solar cells. When only drift of charge carriers is taken into account, a square root dependence on voltage of the photocurrent is expected, governed by the difference between electron and hole mobility. It is demonstrated that both the magnitude and functional dependence of the predicted current are in disagreement with experimental data. However, when both drift and diffusion of charges are taken into account, the predicted photocurrent shows a different behaviour: At low electric fields a linear behaviour is predicted, which results from the diffusion of charges, folllowed by saturation at high fields. The agreement between the theoretical result and the experimental data obtained from MDMO-PPV:PCBM cells is satisfactory when a generation rate of G=1.46 × 1027 electron-hole pairs/m3s is used, showing the importance of diffusion at low fields, i.e., near the open-circuit voltage.

Paper Details

Date Published: 8 September 2004
PDF: 6 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.546038
Show Author Affiliations
L. Jan Anton Koster, Rijksuniv. Groningen (Netherlands)
Valentin D. Mihailetchi, Rijksuniv. Groningen (Netherlands)
Paul W. M. Blom, Rijksuniv. Groningen (Netherlands)

Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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