Nanoscale STM Detection of Photocurrents in Organic Semiconductors

Abstract

A nanosized junction based on a scanning tunneling microscope (see Figure) has been used to investigate the local through-space current–voltage and current–(tip–sample distance) characteristics of sexithiophene and pentacene. In addition to the fact that the materials behave as metal–insulator–semiconductor (MIS) tunnel junctions, their behavior under illumination is reported.