Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 84: Novel Functional Materials I

HL 84.1: Hauptvortrag

Donnerstag, 10. März 2016, 14:45–15:15, H17

Nano-architectures and organic-inorganic hybrid material combinations for novel photovoltaic device concepts — •Silke Christiansen — Helmholtz-Zentrum- Berlin — Max-Planck-Institute for the Science of Light, Erlangen

The implementation of tailored nano-architectures into conventional inorganic and hybrid photovoltaic devices can improve photovoltaic (PV) cells by optimizing charge generation, separation and extraction. The charge generation can be improved through lowly reflective materials such as nano-patterned layers of silicon nanowires (SiNWs) or inverted cones (SiNCs), produced by reactive ion etching combined with nanosphere-lithography. Nanostructures with optimized optical behavior show large surfaces which require proper passivation e.g. by atomic layer deposition (ALD) and more importantly, good charge extraction concepts. These charge extraction concepts seek for novel cheap, transparent and highly conductive materials replacing conventional metal grid-electrodes. Interesting alternatives are solution-processed Ag-nanowire networks, stabilized and protected by e.g. ALD deposited aluminum doped ZnO, showing solar cells with high short circuit currents, low resistivity and small amounts of metal. The present paper shows optical behavior of individual and arrays of SiNWs and SiNCs in finite difference time domain (FDTD) simulations and experiments so that design rules for optimized PV cells can be derived. Experimental confirmation of simulations rely on nano-probing of individual nano-structures and ensembles using a powerful electron-microscopy platform capable of correlative microscopy and spectroscopies.