Effects of Diiodo-Alkane Additives to P3HT Thin Films for High Performance Electronic Applications
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.184
Effects of Diiodo-Alkane Additives to P3HT Thin Films for High Performance Electronic Applications Shelita R. Hall1,3, Harold O. Lee III1, Sam-Shajing Sun1,2,3*
1
Center for Materials Research, Norfolk State University, Norfolk, VA 23504, USA
2
PhD Program in Materials Science and Engineering, Norfolk State University, Norfolk, VA 23504, USA
3
Department of Chemistry, Norfolk State University, Norfolk, VA 23504, USA
ABSTRACT
Polymeric conjugated materials are very promising for developing future soft material-based semiconductors, conductors, electronic and optoelectronic devices due to their inherent advantages such as lightweight, flexible shape, low-cost, ease of processability, ease of scalability, etc. There are a number of ways to tune material properties via post-processing treatments such as annealing, solvent additives, or doping. One challenge of solution processed organic thin film electronics is the repeatable and well-defined morphological control of the resulting films after deposition. In this study, we observed how the addition of diiodo-alkanes to poly-3-hexyl-thiophene (P3HT) solutions effect the formation of resulting thin films. These additives have various boiling points that will affect the drying properties of cast thin films. We also sought to observe if any halogen bonding interaction between iodine and sulfur occurs and if this interaction can be used to promote polymer morphological selfassembly. Techniques such as UV/Vis spectroscopy, X-ray diffraction, and Atomic Force Microscopy were used to probe the evolution of the film morphology as the additives were added to the solutions. 1,8-diiodooctane doped films showed the best overall device performance. This could be due to its favorable interaction with the side chain of P3HT as seen in it morphological properties. This study may result in a new technique that can be used to enhance the solid-state morphology of thin films for high performance electronic applications.
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INTRODUCTION Polymeric conjugated materials are very promising for developing future soft material-based semiconductors, electronic, and optoelectronic devices due to their inherent advantages such as being lightweight, flexible, low-cost, ease of processability, and scalability. Polymeric semiconductor solutions used in electronic and optoelectronic devices are typically deposited via spin coating or blade coating. One challenge of solution-processed polymeric thin-film electronics is the repeatable and well-defined morphological control of the resulting films after deposition. To help with this issue, numerous techniques have been employed to tune the solid-state material properties such as annealing, addition of solvent additives, chemical synthesis, or doping.
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