(In)Organic electronics: a world of ubiquitous and crucial interfaces
The potential of organic electronics for relatively cheap and scalable applications in energy conversion, lighting, display, sensing and flexible electronics has been amply demonstrated over the past decade. Among the many attributes of organic molecular or polymer semiconductors, chiefly attractive is the ease with which functional organic semiconductor layers can be processed and inserted in organic devices, thereby enabling a freedom of device design unmatched to date with any other class of materials. This freedom leads, in general, to the multiplication of organic/(in)organic interfaces, fabricated in many different ways, which must be investigated and optimized. In that regard, surface / interface science has played a considerable role in the process of understanding and optimizing these systems. This talk describes three research efforts that make full use of surface spectroscopy, carrier transport measurements and other techniques: (i) the direct determination of photovoltaic gaps in bulk heterojunction solar cells and correlation with open circuit voltage; (ii) the study of energy level offsets at hybrid organic inorganic perovskite interfaces; and (iii) molecular doping in polymer films and formation of efficient injection/extraction contacts by soft-contact transfer lamination of ultra-thin polymer films.
Antoine Kahn, native of France, received his BSE from the Ecole Polytechnique de Grenoble in 1974 and his PhD in Electrical Engineering and Computer Science from Princeton University in 1978. He joined the Princeton faculty in 1979, and was promoted to Associate Professor in 1985 and Full Professor in 1991. He has extensively investigated the atomic and electronic structures of surfaces and interfaces of inorganic semiconductors. Over the past fifteen years, he focused on the structural, electronic and chemical properties of surfaces and interfaces of intrinsic and doped organic molecular and polymer films. Recent work includes (i) the physics and applications of n- and p-type molecular dopants in organic thin films, (ii) the physics of organic/inorganic and organic/organic heterojunctions, and (iii) the use of transition metal oxides in organic electronics. Kahn has co-authored over 370 refereed regular and review articles. He was the recipient of a Presidential Young Investigator Award (1984-85), of the Joseph Meyerhoff Visiting Professorship (2002) and of the Weston Visiting Professorship (2009-12), Weizmann Institute of Science, Israel. He was elected Fellow of the American Vacuum Society (AVS) (1999) and American Physical Society (APS) (2002).