Regensburg 2002 – wissenschaftliches Programm
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SYOH: Organische Halbleiter
SYOH 6: Organic Photovoltaic Cells
SYOH 6.2: Vortrag
Montag, 11. März 2002, 17:30–17:45, H37
Influence of Temperature and Illumination Intensity on the Current-Voltage Characteristics of Polymer-Fullerene Solar Cells — •Vladimir Dyakonov1, Ingo Riedel1, Zivayi Chiguvare1, Dana Chirvase1, Jürgen Parisi1, Laurence Lutsen2, Dirk Vanderzande2, and J.C. Hummelen3 — 1University of Oldenburg, Faculty of Physics, Dept. for Energy and Semiconductor Research, D-26111 Oldenburg, Germany — 2Institute for Materials Research, Science Park 1, B-3590 Diepenbeek, Belgium — 3Stratingh Institute and MSC, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands
We studied the electronic properties of polymer-fullerene bulk heterojunction solar cells by means of temperature and illumination intensity dependent current-voltage measurements. As an active composite layer we used the methanofullerene PCBM embedded in a thin film of the conjugated polymer OC1C10. It has been found that this kind of solar cell is most efficient at low illumination intensities. For this feature, the transport properties of the used conjugated polymers seem to be responsible.
For temperatures around 100K, we observe an open circuit voltage of approximately 1V, indicating that the photovoltage does not originate from the work function difference of the electrode materials, but rather from the energetics of the donor-acceptor system. Furthermore, we found significantly positive temperature coefficients for the photocurrent, as well as for the fill factor. From these results, we conclude a device efficiency which increases with temperature in the range from 100K to 300K.