Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 2: Thin Film Characterisation I: Structure Analysis and Composition
DS 2.13: Talk
Monday, March 16, 2015, 12:45–13:00, H 0111
In-situ GIXD/GISAXS investigation of intercalation processes in bulk-heterojunction organic solar cells — •Marvin Berlinghof1, Thaer Kassar1, Nusret Sena Güldal2, Christoph Brabec2, and Tobias Unruh1 — 1Chair for Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Chair for Materials for Electronics and Energy Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg
Organic solar cells are a promising technology for cost efficient energy production, because – compared to traditional anorganic solar cells – they only need low temperatures during production, are cheaper to produce in industrial-scales and are flexible. Doctor-bladed thin film solar cells were investigated in-situ during drying by GIXD and GISAXS using our in-house X-ray source and synchrotron radiation. Using different polymers (pBTTT, P3HT, PQT) as organic semiconductors and a wide variety of fullerenes, we observed a change in a different behavior of the d-spacing of pure polymers and polymer-fullerene-mixtures during drying. While the pure polymers showed a decreasing of the d-spacing of the (100)-polymer-peaks during drying, caused of the evaporation of solvent. In the mixtures this d-spacing stayed constant during drying, which is a indicator for intercalation of fullerenes in-between the polymer sheets, which directly influences the efficiency of the organic solar cells. Furthermore the fullerenes hinder the presence of higher diffraction orders and with that decreases the crystallinity of the films. In addition the results of our GISAXS investigation and depth-dependend measurements will be presented.