Interface formation between poly(2,5-diheptyl-p-phenylenevinylene) and calcium: implications for light-emitting diodes
1994 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 67, no 1-3, 133-136 p.Article in journal (Refereed) PublishedText
The early stages of metal/polymer interface formation between calcium and poly(2,5-diheptyl-p-phenylenevinylene) (PDHPV) have been studied using both X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. Charge transfer is observed from the metal atoms to the polymer; as a result the calcium atoms at the interface are ionic, and negative bipolarons appear as the charge-carrying species on the polymer chains. This n-type doping of PDHPV by calcium leads to the appearance of new electronic states in the polymer bandgap. The calcium atoms appear to diffuse into the near surface region of the polymer, rather than forming a well-defined overlayer on the organic films.
Place, publisher, year, edition, pages
Elsevier, 1994. Vol. 67, no 1-3, 133-136 p.
Interface, Diodes, Poly(2, 5-diheptyl-p-phenylenevinylene), Calcium
Physical Sciences Chemical Sciences
IdentifiersURN: urn:nbn:se:liu:diva-124174DOI: 10.1016/0379-6779(94)90026-4ISI: A1994PW12000024OAI: oai:DiVA.org:liu-124174DiVA: diva2:896169
Symposium D on Organic Materials for Electronics - Polymer Interfaces with Metals and Semiconductors, at the 1994 E-MRS Spring Conference, Strasbourg, France, May 24-27, 1994