Single-crystal organic charge-transfer interfaces probed using Schottky-gated heterostructures

Article Article scientifique Article Single-crystal organic charge-transfer interfaces probed using Schottky-gated heterostructures eng 2012 author Gutierrez Lezama Ignacio 681297 author Nakano Masaki 702117 author Minder Nikolas Aron 694895 author Chen Zhihua author Di Girolamo Flavia 736319 author Facchetti Antonio author Morpurgo Alberto 666794 788-794 10.1038/nmat3383 1476-1122 Organic semiconductors based on small conjugated molecules generally behave as insulators when undoped, but the heterointerfaces of two such materials can show electrical conductivity as large as in a metal. Although charge transfer is commonly invoked to explain the phenomenon, the details of the process and the nature of the interfacial charge carriers remain largely unexplored. Herewe use Schottky-gated heterostructures to probe the conducting layer at the interface between rubrene and PDIF-CN2 single crystals. Gate-modulated conductivity measurements demonstrate that interfacial transport is due to electrons, whose mobility exhibits band-like behaviour from room temperature to ~150 K, and remains as high as ~1 cm2 V-1 s-1 at 30 K for the best devices. The electron density decreases linearly with decreasing temperature, an observation that can be explained quantitatively on the basis of the heterostructure band diagram. These results elucidate the electronic structure of rubrene/PDIF-CN2 interfaces and show the potential of Schottky-gated organic heterostructures for the investigation of transport in molecular semiconductors. Dewey 500.2 33 Département de physique de la matière quantique 131 35 Groupe de physique appliquée 135 false 678 Groupe Morpurgo Nature materials 11 9 539f2727-4c7e-4156-a265-4992acbebd00 Article (Published version) Restricted Morpurgo10.pdf 1028489 application/pdf restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique Faculté des sciences / Section de physique / Groupe de physique appliquée

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Single-crystal organic charge-transfer interfaces probed using Schottky-gated heterostructures	Nature materials			2012	646	0

Archive ouverte UNIGE

Di Girolamo, Flavia