Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.67: Poster
Montag, 26. März 2007, 15:00–17:30, Poster A
Polymer-Fullerene Bulk-Heterojunction Solar Cells With Additional ZnO:Al Layer — •Daniel Rauh1,2, Volker Lorrmann1,2, Carsten Deibel2, Vladimir Dyakonov1,2, and Ingo Riedel1 — 1Div. Functional Materials for Energy Technology, ZAE Bayern e.V., Am Hubland, D-97074 Würzburg, Germany — 2Experimental Physics VI (Energy Research), Faculty of Physics and Astronomy, Julius-Maximilians University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
We investigated novel functional layers of ZnO:Al serving as a buffer layer between the absorber and the light reflecting metal electrode of organic bulk heterojunction solar cells. The reason for introducing such a layer is twofold: 1. The ZnO:Al layer serves as an optical spacer readjusting the electric field distribution throughout the device, thus causing improved light absorption within the absorber. 2. n-type ZnO:Al is expected to enhance the selectivity of the metal electrode serving as a hole blocking layer. Our optical simulations clearly demonstrate that the gain in absorption do not exceed 20 % upon introduction of an optical spacer. We synthesized nanoparticular ZnO:Al and produced thin films for devices with the aforementioned cell structure and compared the photovoltaic performance with reference devices. To discriminate between the effects of improved light absorption and enhanced selectivity of the metal electrode we combined optical simulations and electrical interface characterization.