Charge equilibration and potential steps in organic semiconductor multilayers
2012 (English)In: Organic electronics, ISSN 1566-1199, Vol. 13, no 10, 1793-1801 p.Article in journal (Refereed) Published
Substantial potential steps similar to 0.5 eV are frequently observed in organic multilayers of donor and acceptor molecules. Often such potential steps depend on the order in which the individual layers are deposited, or on which substrate they are deposited. In this paper we outline a model for these potential steps, based upon integer charge transfer between donors and acceptors, charge equilibration across the multilayer, and simple electrostatics. Each donor, acceptor, or substrate material is characterized by a pinning level, and the potential profile can be deduced from the sequential order of the layers, and the differences between their pinning levels. For particular orderings we predict that intrinsic potential differences lead to electric fields across individual layers, which may falsely be interpreted as band bending.
Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 13, no 10, 1793-1801 p.
Organic semiconductor, Donor acceptor, Potential step, Multilayer
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-85631DOI: 10.1016/j.orgel.2012.05.041ISI: 000309591200005OAI: oai:DiVA.org:liu-85631DiVA: diva2:572055
Funding Agencies|European project MINOTOR|FP7-NMP-228424|STEM, the Swedish Energy Agency||2012-11-262012-11-262012-11-28