Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 56: Photovoltaik I

HL 56.6: Vortrag

Dienstag, 8. März 2005, 16:15–16:30, TU P-N202

Photoluminescence, Open Circuit Voltage, and Photocurrents in Cu(In,Ga)Se₂ Solar Cells with Lateral Submicron Resolution — •Tim Jürgens, Levent Gütay, Rudolf Brüggemann, and Gottfried Heinrich Bauer — Institute of Physics, Carl von Ossietzky University Oldenburg, Germany

Thin film Cu(In,Ga)Se₂ solar cells prepared under conditions similar to pilot line module production have been analyzed with respect to local photoluminescence and according splitting of quasi-Fermi levels with submicron lateral resolution under open circuit and short circuit conditions. The lateral patterns of luminescence yields, announcing variations of quasi-Fermi energies in the range of some tens of meV and extending to some microns, by far exceed the size of individual grains of 1 micron or less. The response of PL, say, of local V_oc, with that of short circuit currents turns out to be anti-correlated significantly. This behaviour will be discussed in terms of a two dimensional network coupling illuminated and dark regimes and containing non-linear elements.