Electronic Properties of Ï€-conjugated Materials II - UniversitÃ¤t ...

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Invited Lectures – 2 π 2011 Small-molecule organic devices: status and perspectives Karl Leo Technische Universität Dresden and Fraunhofer-Institut für Photonische Mikrosysteme, Dresden Organic semiconductors with conjugated electron system are currently intensively investigated since they offer the possibility for novel flexible, low-cost ubiquitous electronics. Prime examples are novel devices such as organic light-emi�ing diodes (OLED), and organic solar cells. In this talk I will discuss recent progress in this field, with a focus on oligomer (small-molecule) devices. Although organic semiconductors are characterized by mobilities many orders of magnitude below silicon or GaAs, they allow in certain applications surprisingly efficient devices. For instance, white OLED have recently achieved very high efficiencies of 90 lm/W [1], significantly higher than fluorescent tubes, opening the path to a new form of high-efficiency area lighting devices. For solar cells, efficiencies and lifetimes are still quite low, but have also improved significantly: Recently, we have achieved solar cells with certified efficiency reaching over 8% on larger area. I will discuss some of the remaining open issues to bring these devices to broad application. References [1] S. Reineke, F. Lindner, G. Schwartz, N. Seidler, K. Walzer, B. Lüssem, Nature 459, 234 (2009) 24
π 2011 N�� Invited Lectures – 2 25 Lectures
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