Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.34: Poster
Mittwoch, 3. April 2019, 11:00–13:00, Poster B1
From spin-coating to slot-die printing in organic solar cells: Where do we lose the efficiency? — •Daniel Kroh1, Jegadesan Subbiah2, Doojin Vak3, David Jones2, and Anna Köhler1 — 1Soft Matter Optoelectronics, University of Bayreuth — 2School of Chemistry, Bio21 Institute, University of Melbourne, Australia — 3CSIRO Manufacturing, Melbourne, VIC 3168, Australia
The field of solution-processed organic solar cells (OSCs) has been dominated by polymeric semiconductors, though molecular materials with high power conversion efficiencies (PCEs) in OSCs have been reported and are attractive due to their reduced batch-to-batch variation. For example, devices based on the donor molecule BQR are thermally stable and show a low thickness dependence of the active layer with PCEs reaching 10.7%. These properties suggest BQR as an excellent choice for roll-to-roll processing, which is relevant for industrial fabrication. However, within the transition from spin coated to slot-die printed devices a drop in efficiency appears. Although this drop is commonly observed, its reason is not clear. We use time resolved and temperature dependent UV-Vis absorption and photoluminescence spectroscopy to investigate the formation of spin-cast and slot-die coated films and the resulting morphology in-situ during the deposition process of BQR:PC70BM blends. Comparing the two deposition methods allows us to get a better understanding of the correlation between film morphology and device performance. With this insight, we can optimize the conditions of the slot-die printing process to reduce the drop in PCE, which is an important step towards industrial fabrication.