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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Organic Electronics and Photovoltaics 2
CPP 26.2: Vortrag
Mittwoch, 7. September 2022, 11:45–12:00, H38
Exploring Highly Ordered Rubrene:C60 Heterojunctions for Organic Photodetectors — •Anna-Lena Hofmann1, Lucy Winkler1, Max Herzog1, Eva Bittrich2, Jakob Wolansky1, Martin Kroll1, Johannes Benduhn1, and Karl Leo1 — 1Institute of Applied Physics, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany — 2Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
Rubrene can form highly ordered phases, demonstrating an unusually high charge carrier mobility for holes (>10 cm2 V−1 s−1) even in thin films. Therefore it is a promising material for high-performance organic photodetectors (OPDs). To study the impact on OPDs, crystalline triclinic rubrene is compared to amorphous rubrene. Planar heterojunctions (PHJs) and bulk heterojunctions (BHJs) are fabricated for both material systems. For the latter, rubrene is doped with 2, 5, and 10 wt% of C60. Linearly polarized microscopy is used to get the first insight into the morphology, which is then completed by ellipsometry, atomic force microscopy (AFM), and x-ray diffraction (XRD). For the electrical characterization, the external quantum efficiency (EQE) and IV characteristics are obtained, where an additional crystalline sample with a neat C60 layer is investigated. The neat layer of C60 achieves an enormous improvement of the EQE. This makes the PHJ a more favourable device architecture. Even though triclinic rubrene reaches a higher EQE and has a broader spectral response, it does underperform in optimized OPDs concerning the specific detectivity since the dark current is three magnitudes higher than the amorphous counterpart.