Regensburg 2007 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.58: Poster
Monday, March 26, 2007, 17:30–20:30, Poster C
Scanning tunneling spectroscopy on the chalcopyrite solar cell absorber material Cu(In,Ga)Se2 — •Harry Mönig1, Sascha Sadewasser2, Ahmed Ennaoui2, Christian Kaufmann2, Timo Kropp2, Iver Lauermann2, Tim Münchenberg2, Rodrigo Saez-Araoz1, Hans-Werner Schock2, Ferdinand Streicher2, and Martha Lux-Steiner1,2 — 1Freie Universität Berlin — 2Hahn-Meitner-Institut Berlin
Cu(In,Ga)Se2-based thin film solar cells have reached efficiencies close to 20 % [1]. Nevertheless, little is known about electronic transport and carrier recombination in this material on a microscopic scale. Especially grain boundaries in these polycrystalline materials are considered to play an important role in the performance of these solar cells [2]. We applied scanning tunneling microscopy and spectroscopy to gain more insight in the electronic microstructure of the material. Our results point to lateral electronic inhomogeneities on the absorber surface and to an enhanced density of states at grain boundaries. The influence of charging effects is discussed.
[1] M.A. Contreras et al. Prog. Photovoltaics Res. Appl. 13, 209 (2005)
[2] S. Siebentritt et al., Phys. Rev. Lett. 97, 146601 (2006)