Quantification of the solid-state charge mobility in a model radical polymer

Abstract

We establish that an oft-used radical polymer, poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate) (PTMA), has a solid-state hole mobility value on the order of 10āˆ’4 cm2 Vāˆ’1 sāˆ’1 in a space charge-limited device geometry. Despite being completely amorphous and lacking any Ļ€-conjugation, these results demonstrate that the hole mobility of PTMA is comparable to many well-studied conjugated polymers [e.g., poly(3-hexylthiophene)]. Furthermore, we show that the space charge-limited charge carrier mobility of these macromolecules is only a weak function of temperature, in contrast to many thermally-activated models of charge transport in polymeric materials. This key result demonstrates that the charge transport in radical polymers is inherently different than that in semicrystalline, conjugated polymers. These results establish the mechanism of solid-state charge transport in radical polymers and provide macromolecular design principles for this emerging class of organic electronic materials.

Document Details

Document Type
Pub Defense Publication
Publication Date
May 26, 2014
Source ID
10.1063/1.4880118

Entities

People

  • Aditya G. Baradwaj
  • Bryan W Boudouris
  • Lizbeth Rostro
  • Muhammad Ashraful Alam

Organizations

  • Air Force Office of Scientific Research
  • Purdue University

Tags

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanocomposite Materials Science
  • Polymer Science and Technology

Technology Areas

  • Microelectronics
  • Space