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Proceedings Paper

Temperature and irradiance effect on the photovoltaic parameters of a fullerene/conjugated-polymer solar cell
Author(s): Eugene A. Katz; David Faiman; Yafit Cohen; Franz Padinger; Christoph J. Brabec; Niyazi Serdar Sariciftci
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Paper Abstract

Bulk donor-acceptor heterojunctions between conjugated polymers and fullerene derivatives have been utilized successfully for photovoltaic devices showing monochromatic efficiencies above 1%. The present paper reports the temperature and irradiance dependencies of full-spectrum photovoltaic parameters for such devices. The measurements were performed under real sun conditions and under a solar simulator. The sun provided a light source stable in intensity to within +/- 1% and closely approximating a true AM1.5 spectrum, whereas the simulator enabled the light intensity to be varied in the range 80 - 600 W m-2. The most interesting feature that was observed for these devices is that above a cell temperature of 20 degree(s)C the positive temperature coefficient observed for the short- circuit current exceeds in magnitude the negative temperature coefficient that was found for the open-circuit voltage. This means that, unlike the situation for conventional PV devices, these cells actually exhibit an increase in efficient with increasing temperature (reaching a value of 0.63% at 40 degree(s)C). We suggest that the observed behavior originates from the temperature dependence of the conductivity of the conjugated polymers-fullerene composite. This hypothesis is confirmed by the irradiance-resolved measurements performed at different cell temperatures. We observed a linear increase in the short-circuit current with light intensity over the whole ranges of irradiances and temperatures but maximum temperature influence is observed at highest light intensity.

Paper Details

Date Published: 5 February 2001
PDF: 8 pages
Proc. SPIE 4108, Organic Photovoltaics, (5 February 2001); doi: 10.1117/12.416940
Show Author Affiliations
Eugene A. Katz, Ben-Gurion Univ. of the Negev (Israel)
David Faiman, Ben-Gurion Univ. of the Negev (Israel)
Yafit Cohen, Ben-Gurion Univ. of the Negev (Israel)
Franz Padinger, Johannes Kepler Univ. Linz (Austria)
Christoph J. Brabec, Johannes Kepler Univ. Linz (Germany)
Niyazi Serdar Sariciftci, Johannes Kepler Univ. Linz (Austria)

Published in SPIE Proceedings Vol. 4108:
Organic Photovoltaics
Zakya H. Kafafi, Editor(s)

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