Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 6, Issue 8, Pages 1303-1309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b00444
Keywords
-
Categories
Funding
- Center for Interface Science: Solar Electric Materials (CISSEM), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE- SC0001084]
- German Science Foundation (DFG) through SPP1355 [BR4031/1-2]
Ask authors/readers for more resources
We demonstrate new approaches to the characterization of oxidized regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) that results from electronic equilibration with device-relevant high work function electrical contacts using high-resolution X-ray (XPS) and ultraviolet (UPS) photoelectron spectroscopy (PES). Careful interpretation of photoemission signals from thiophene sulfur atoms in thin (ca. 20 nm or less) P3HT films provides the ability to uniquely elucidate the products of charge transfer between the polymer and the electrical contact, which is a result of Fermi-level equilibration between the two materials. By comparing high-resolution S 2p core-level spectra to electrochemically oxidized P3HT standards, the extent of the contact doping reaction is quantified, where one in every six thiophene units (ca. 20%) in the first monolayer is oxidized. Finally, angle-resolved XPS of both pure P3HT and its blends with phenyl-C-61-butyric acid methyl ester (PCBM) confirms that oxidized P3HT species exist near contacts with work functions greater than ca. 4 eV, providing a means to characterize the interface and bulk region of the organic semiconductor in a single film.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available