Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 5: Photovoltaic

HL 5.1: Vortrag

Montag, 26. März 2007, 11:00–11:15, H14

Electrochemically prepared schottky-type nanoemitter solar cells — •Thomas Stempel Pereira, Katarzyna Skorupska, Michael Kanis, Michael Lublow, Mohammed Aggour, and Hans-Joachim Lewerenz — Hahn-Meitner-Institut, Glienicker Str. 100, 14109 Berlin

We produced a schottky-type nanoemitter solar cell with photoelectrochemical methods. It is known, that anodic current-oscillations in fluoride-containing solutions built up porous SiO₂ with an average thickness of 10 nm. The pores, some of which maintain contact to the Si-surface, have a diameter of several ten nm. Their distribution depends on the process-parameters and the chosen emersion current phase. These oxides can be used as a mask for selective alkaline Si-etching and subsequent electrodeposition of metals into the pores. Used in electrochemical solar-cells with Pt-nanoemitters and I⁻/I₃⁻-redox-electrolyte we achieved efficiencies better than 5 %. AFM and HRSEM-images of the preparation steps and the complete device are presented, as well as a model for the bandstructure based on the determination of the flatband-potential by electrochemical impedance-spectroscopy.