| Author(s): |
Vivek M. Prabhu; Jihoon Kang; Nayool Shin; Do Y. Yoon; Do Y. Jang; |
| Title: |
Structure and Properties of Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors |
| Published: |
June 04, 2008 |
| Abstract: |
A comprehensive structural and electrical characterization of solution-processed blend films of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) and poly(alpha-methylstyrene) (PaMS) was performed to understand and optimize the blend semiconductor films, which are very attractive as the active layer in organic thin-film transistors (OTFTs). Our study, based on careful measurements of specular neutron reflectivity and grazing-incidence X-ray diffraction, showed not only the important segregation phenomenon of TIPS-pentacene to the air surface but also a surprising effect of the molecular weight of the PaMS insulator on the TIPS-pentacene segregation and crystallization at the solid substrate, which is most critical to the charge transport in solution-processed OTFTs. This new finding led to the preparation of the TIPS-pentacene/PaMS blend active layer with superior functional properties over those of neat TIPS-pentacene, exhibiting high field-effect mobility, high on/off ratio and low threshold voltage. |
| Citation: |
Journal of the American Chemical Society |
| Volume: |
130 |
| Pages: |
pp. 12273 - 12275 |
| Keywords: |
organic semiconductor; polymer thin film; neutron reflectivity; |
| Research Areas: |
NCNR, Synchrotron, Polymers, Electronics, Nanomaterials, Soft Condensed Matter |
| PDF version: |
 Click here to retrieve PDF version of paper (338KB) |
