Invited Paper TF-WeE3
Understanding Organic-Organic Quasiepitaxy

Wednesday, December 14, 2016, 6:20 pm, Room Makai

The presence of excitons in organic materials offer new opportunities for low-cost photovoltaics and electronic systems and provide prospects for unique energy science and applications. In this talk I will review our understanding of organic quasepitaxy. I will then discuss our demonstration of the growth of ordered organic-organic hetero-quasieptiaxial supperlattices, composed of incommensurate organic semiconductors with sustained registry grown from the bottom up via a new step-edge nucleation driven growth mechanism. By probing a range of molecular pairings with in-situ and real-time diffraction, we further uncover driving forces that can broadly enable this type of growth, which are completely distinct from the requirements of inorganic epitaxy. It is well known that crystalline order, orientation, and quantum confinement of highly anisotropic organic semiconductors can significantly alter the properties and performance of organic electronics. Thus, these demonstrations can enable entirely new photophysical phenomena and provide opportunities for manipulating energy in a variety of excitonic structures.