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Proceedings Paper

Origin of the open circuit voltage in conjugated polymer-fullerene photovoltaic cells
Author(s): Heejoo Kim; Sung Ho Jin; Hongsuk Suh; Kwanghee Lee
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Paper Abstract

We fabricated polymer-fullerene photovoltaic (PV) devices using various conjugated polymers, poly[2-methoxy-5-(2’-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly{2-[4-(3,7-dimethyloctyloxy)-phenoxy]-1,4-phenylenevinyl-ene} (p-DMOP-PPV), and their copolymer system, p-DMOP-co-MEH-PPV. By comparing PV characteristics of such devices with a systematic change of the energy levels (ionization potential Ip and electron affinity Ea), we investigated the origin of open circuit voltage (Voc) of the devices. Our results indicate that the magnitude of Voc is governed by the difference between Ea of the fullerene and Ip of the polymer, which is not consistent with previous consideration of the work function difference between electrodes as in conventional metal-insulator-metal type devices.

Paper Details

Date Published: 6 February 2004
PDF: 8 pages
Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); doi: 10.1117/12.504937
Show Author Affiliations
Heejoo Kim, Pusan National Univ. (South Korea)
Sung Ho Jin, Pusan National Univ. (South Korea)
Hongsuk Suh, Pusan National Univ. (South Korea)
Kwanghee Lee, Pusan National Univ. (South Korea)

Published in SPIE Proceedings Vol. 5215:
Organic Photovoltaics IV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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