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 Schorr^4,6, Gilles Dennler³, Edgardo Saucedo², Carsten Ronning¹, and Claudia S. Schnohr¹ — ¹Institut 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.