Abstract
Molecula r organic semiconductors form the materials basis for “organic electroni cs”\, the field that may someday lead to ubiquitous flexible optoelectro nics. In order to better understand the intrinsic photophysical and transp ort phenomena in this important class of materials\, it is necessary to st udy samples of very high structural order and chemical purity. Such materi als exist in the form of molecular single crystals that can be used in fab rication of high-performance prototype organic field-effect transistors\, photo-diodes and photo-voltaic cells\, in which the intrinsic properties o f organic semiconductors can be investigated without parasitic effects of disorder. This talk will overview some of the exciting recent achievements in this area. An emphasis will be put on novel methods of surface functio nalization leading to unusual transport and photoconducting properties of organic interfaces\, as revealed by Hall effect measurements and photocurr ent excitation spectroscopy. In addition\, very interesting non-linear eff ects in photoconductivity of crystalline organic semiconductors originatin g from a long-range exciton diffusion and exciton-charge interactions will be discussed and briefly compared with the behavior of completely differe nt types of semiconductors\, such as lead-halide perovskites.[nbsp]
Bio
Vitaly Podzorov is a Professor of Physics at Rutgers University\, New Jersey\, USA. He received his Master degree in Ph ysics from Moscow Institute of Physics and Technology in 1995. In 1995-199 7\, he worked at Lebedev Institute of Physics in Moscow on semiconductor s pectroscopy. In 2002\, he received his Ph.D. in condensed matter physics f rom Rutgers University\, where he studied strongly-correlated multiferroic oxides. Podzorov’s current research interests include: (a) charge carri er transport and optical properties of highly ordered organic semiconducto rs\; (b) molecular self-assembly\, (c) electric field-effect in layered in organic materials and strongly-correlated oxides\, and (d) photophysics of hybrid perovskites.