Regensburg 2002 – wissenschaftliches Programm
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SYOH: Organische Halbleiter
SYOH 7: Poster
SYOH 7.42: Poster
Montag, 11. März 2002, 18:00–21:00, C
Organic semiconductor laser structures with metallic contacts — •M. Reufer1, S. Riechel1, U. Lemmer1, J. Feldmann1, T. Benstem2, W. Kowalsky2, U. Scherf3, A. Gombert4, and V. Wittwer4 — 1Lehrstuhl für Photonik und Optoelektronik, Sektion Physik and CeNS, Universität München, Amalienstr. 54, 80799 München — 2Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Schleinitzstr. 22, 38106 Braunschweig — 3Lehrstuhl für Polymerchemie, Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24–25, 14476 Golm — 4Fraunhofer Institut für Solare Energiesysteme ISE, Heidenhofstr. 2, 79110 Freiburg
Organic semiconductor lasers exhibit many advantageous properties. So far electrically pumped lasing has only been demonstrated for rather thick molecular crystals exhibiting high charge carrier mobilities. Disordered organic semiconductors like evaporated small molecules and conjugated polymers offer much lower mobilities. Thus injection laser devices have to be realized in thin film waveguide geometries. Optical losses in waveguides comprising metallic contacts are a major problem for the realization of such lasers. We investigate the properties of optically pumped lasers based on Alq3:DCM as well as the conjugated polymer LPPP using two different concepts for fabricating diode structures which allow for low-loss waveguiding. We use mechanically nanopatterned polyester substrates to induce distributed feedback. The resulting values for the threshold material gain are determined for the different heterostructures. Implications for the design of organic injection lasers are discussed.