| The optical properties of organic molecular crystals (OMCs) are of great interest from the perspective of pure research as well as due to their potential use in photonic applications. An OMC's optical properties are dominated by excitons. Recently, it has been shown that exciton properties can be modified by growth of ultrathin layers of an archetype organic compound: 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). In this work we examine the structural and optical properties of ultrathin layers of several crystalline organic materials deposited by the ultrahigh vacuum process of organic molecular beam deposition.;We examine the evolution of growth of PTCDA from monolayer to ;We also study the optical spectra of two sets of multilayer stacks of ultrathin (... |
