Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Photovoltaics I

HL 6.8: Vortrag

Montag, 12. März 2018, 11:30–11:45, EW 203

Compositional inhomogeneity in kesterite thin film solar cell absorbers — •Maurizio Ritzer1, Sven Schönherr1, Philipp Schöppe1, Sergio Giraldo2, Gerardo Larramona3, Galina Gurieva4, Konrad Ritter1, Gema Martínez-Criado5, Susan Schorr4,6, Gilles Dennler3, Edgardo Saucedo2, Carsten Ronning1, and Claudia S. Schnohr11Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Germany — 2Catalonia Institute for Energy Research, Spain — 3IMRA Europe S.A.S., France — 4Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — 5Instituto de Ciencia de Materiales de Madrid, Spain — 6Institut für Geologische Wissenschaften, Freie Universität Berlin, Germany

Kesterite Cu2ZnSnSe4 (CZTSe) is a promising absorber material for thin film solar cells. However, it often contains secondary phases that can limit their conversion efficiency. Moreover, the local kesterite composition may fluctuate on different length scales. High resolution, spatially resolved X-ray beam investigations enable insights into such compositional variations. Thin cross section lamellas were prepared out of complete solar cells using a focused ion beam system, in order to achieve high spatial resolution and to minimize averaging along the beam direction. Subsequently, the lamellas were scanned with the highly focused X-ray beam of 50 nm at the ID16B-NA station of the ESRF and by analyzing the emitted fluorescence (XRF) radiation we obtained elemental distribution maps. Thus, our approach easily allows to compare the composition within single grains and even grain boundaries.

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