Interfacial electronic properties of pentacene tuned by a molecular monolayer of C-60
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, no 11, 115401-1-115401-7 p.Article in journal (Refereed) Published
Fine-tuning charge injection barriers between organic materials and electrodes is critical to optimize organic electronic device performance. Here we demonstrate that by modifying gold substrates with a monolayer of fullerene, significant decrease in the hole-injection barrier into pentacene films can be achieved. The insertion of the fullerene monolayer modifies the interfacial dipole and produces an interface where the pentacene molecules form a standing-up orientation with their long axis parallel to the surface normal. The latter effect lowers the vertical ionization energy of the pentacene molecules at the interface as compared to the pentacene-on-Au case, as well as improves the pi-pi overlap between the pentacene molecules that will likely enhance the transport properties in corresponding devices.
Place, publisher, year, edition, pages
College Park, MD, United States: American Physical Society , 2009. Vol. 80, no 11, 115401-1-115401-7 p.
IdentifiersURN: urn:nbn:se:liu:diva-51266DOI: 10.1103/PhysRevB.80.115401ISI: 000270383200113OAI: oai:DiVA.org:liu-51266DiVA: diva2:273906