Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: "New" Materials and New Physics in "Old" Materials I

HL 7.3: Talk

Monday, March 26, 2012, 10:00–10:15, EW 015

Optical and electrical properties of different copper oxide phases deposited by magnetron sputtering — •Daniel Reppin, Angelika Polity, and Bruno K. Meyer — I. Physikalisches Institut, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany

Copper oxides Cu_xO_y are attractive materials for solar cell applications; that is due to the fact that the bandgaps of the different oxides lie in the range from 1.6 eV (CuO) to 2.17 eV (Cu₂O). Beside these two "main" phases of copper-oxide there are at least two phases which are more or less discussed in the literature: the metastable Cu₄O₃ and Cu₃O₂ known from low temperature oxidation experiments.

We will show that it is possible to obtain the different copper oxides by magnetron sputtering under different oxygen flows without substrate heating. A correlation will be given for structural, optical and electrical properties with the phase changes between the copper oxides. The obtained properties of the films will be discussed in terms of phase purity and stoichiometry.