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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.34: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1C

Ultra-Thin Resonant Cavity Enhanced Amorphous Germanium Solar Cells on Zinc Oxide Honeycomb Structures — •Colleen Lattyak, Regina-Elisabeth Ravekes, Volker Steenhoff, Martin Vehse, and Carsten Agert — NEXT ENERGY - EWE Research Centre for Energy Technology at the University of Oldenburg, Carl-von-Ossietzky-Str. 15, 26129 Oldenburg, Germany

Hydrogenated amorphous germanium (a-Ge:H) has a high absorption coefficient and similar band gap to microcrystalline silicon (μc-Si:H). Recently, solar cells with ultra-thin (<25nm) a-Ge:H absorber films based on absorbing resonant cavities were developed in our group. Due to strong broadband absorption and good electrical quality they have the potential to replace thick (>1μm) standard μc-Si:H cells. In order to further enhance their optical properties a-Ge:H solar cells are deposited on 3D 1μm-sized zinc oxide (ZnO) honeycomb structures, fabricated in a combined process of nanosphere lithography and electrochemical deposition. The honeycomb structure increases the volume of the overlying absorber layer making it possible for more light to be absorbed. We present external quantum efficiency (EQE) measurements which demonstrate the beneficial optical effects and the potential for a high short circuit current density. We also deduce an optimal fabrication procedure for the ZnO honeycomb structures with optimal geometry for the a-Ge:H absorber system.