title: Effect of structure and interlayer diffusion in organic position sensitive photodetectors based on complementary wedge donor/acceptor layers.
abstract: We have developed organic photodetectors based on two complementary wedge layers made of CuPc and C60 and observed a strong spatial dependence of the spectral response on the position of the incident light spot. Photocurrent measurements are correlated with atomic force microscopy (AFM), micro-Raman and ellipsometry maps in order to provide insights into the local donor/acceptor concentration, layer thickness and nature of the donor-acceptor interface along the direction of the thickness gradient. Deviations in spatial dependence between experimental photocurrent values and those predicted with a model assuming a sharp and well defined organic-organic interface are discussed in terms of inter-diffusion layers.
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049-Madrid, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Cabanillas-Gonzalez
authors.forename: Malte
authors.initials: M
authors.lastname: Schmidt
authors.forename: Ovidio
authors.initials: O
authors.lastname: Peña-Rodríguez
authors.forename: M Isabel
authors.initials: MI
authors.lastname: Alonso
authors.forename: Alejandro R
authors.initials: AR
authors.lastname: Goñi
authors.forename: Mariano
authors.initials: M
authors.lastname: Campoy-Quiles
mesh_terms: D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D010783:Photometry / Q000295:instrumentation*
chemical_list: D009930:Organic Chemicals