AVS 52nd International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP11
Thermochromism Effects in Poly(3-hexylthiophene)

Tuesday, November 1, 2005, 4:00 pm, Room Exhibit Hall C&D

Session: Surface Science Poster Session
Presenter: D.Q. Feng, University of Nebraska-Lincoln
Authors: D.Q. Feng, University of Nebraska-Lincoln
P.A. Dowben, University of Nebraska-Lincoln
Correspondent: Click to Email
We find evidence for a gradual semiconductor to insulator transition in poly(3-hexylthiophene), that appears to be mediated by a low density of defects states within the highest occupied molecular orbital to lowest unoccupied molecular orbital gap. The photoemission and transport measurements indicate that a loss of charge mobility occurs with decreasing temperature, while the molecular configuration also changes with temperature. Defects states have been identified in photoemission and these defects states are believed to be very heterogeneous.