Charge transfer at n-doped organic-organic heterojunctions
2009; American Institute of Physics; Volume: 105; Issue: 12 Linguagem: Inglês
10.1063/1.3153962
ISSN1520-8850
Autores Tópico(s)Conducting polymers and applications
ResumoThe impact of n-doping on the electronic structure of two organic-organic heterojunctions (OOH) is investigated with ultraviolet photoemission spectroscopy. The two OOHs have a type II staggered gap configuration corresponding to donor-acceptor pairs applicable to photovoltaic cells. Both molecular top acceptor layers have large electron affinity, which leads to electron transfer from the donor layer. The result is a significant interface dipole (Δ∼0.4–0.6eV) between the two molecular films, at both undoped and doped interfaces, consistent with a stronger interaction between molecular constituents than in wide, largely overlapping, band gap OOHs.
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