Regensburg 2016 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 9: High-Efficiency Photovoltaics (with CPP)

AKE 9.1: Hauptvortrag

Dienstag, 8. März 2016, 09:30–10:00, H3

Multi junction concepts for photovoltaics and artificial photosynthesis: Critical points of current and future high-performance solar energy conversion — •Thomas Hannappel — Technische Universität Ilmenau, Department of Physics, Ilmenau, Germany

By far the highest solar energy conversion efficiencies have been achieved so far, when employing III-V-based semiconductor layer structures in multi junction approaches for optimum exploitation of the solar spectrum [1-3]. In these record-breaking multi-layer structures, interfaces are the most crucial parts in different regards. In devices for direct water splitting the solid-liquid interface is in particular delicate towards (photo)electrochemical corrosion and charge transfer. An interface with low-defect density between silicon and III-V compounds would be a major breakthrough and would not only add to solar energy conversion, but all kinds of opto-electronic devices.

To accelerate progress in these fields, it is essential to gain an atomic-scale understanding of critical and essential heterojunction preparation, including the complex physico-chemical processes and interface formations [4,5]. Here, we will present original analysis to scrutinise state-of-the-art preparation and to develop future solar energy conversion routes with multi junction concepts.

[1] M.M. May et al., Nat. Commun. 6 (2015) 8286 [2] A. Nakamura et al. Appl. Phys. Express 8 (2015) 107101 [3] F. Dimroth et al., Prog. Photovoltaics 22 (2014) 277 [4] O. Supplie et al., J. Phys. Chem. Lett 6 (2015) 464 [5] M.M. May et al., J. Phys. Chem. C. 118 (2014) 19032