Effects of Iodine Doping on Optoelectronic and Chemical Properties of Polyterpenol Thin Films.
Owing to their amorphous, highly cross-liked nature, most plasma polymers display dielectric properties. This study investigates iodine doping as the means to tune optoelectronic properties of plasma polymer derived from a low-cost, renewable resource, i.e.,Melaleuca alternifoliaoil. In situ exposure of polyterpenol to vapors of electron-accepting dopant reduced the optical band gap to 1.5 eV and increased the conductivity from 5.05 × 10-8S/cm to 1.20 × 10-6S/cm. The increased conductivity may, in part, be attributed to the formation of charge-transfer complexes between the polymer chain and halogen, which act as a cation and anion, respectively. Higher levels of doping notably increased the refractive index, from 1.54 to 1.70 (at 500 nm), and significantly reduced the transparency of films.
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia. kateryna.bazaka@qut.edu.au.|CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organisation, P.O. Box 218, Lindfield, NSW 2070, Australia. kateryna.bazaka@qut.edu.au.|College of Science and Engineering, James Cook University, Townsville, QLD 4814, Australia. kateryna.bazaka@qut.edu.au.
Kateryna
K
Bazaka
College of Science and Engineering, James Cook University, Townsville, QLD 4814, Australia. mohan.jacob@jcu.edu.au.
Mohan V
MV
Jacob
iodine doping; optical properties; organic polymer; plasma polymerization; thin film