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26 August 2008A doping mechanism for organic semiconductors derived from SXPS measurements on co-evaporated films of CuPc and TCNQ and on a TCNQ/CuPc interface
Synchrotron induced photoelectron spectroscopy on in situ
co-evaporated blends of CuPc and TCNQ and on
TCNQ/CuPc interfaces is applied for monitoring the electronic interaction indicated in systematic shifts of the CuPc and
TCNQ HOMO and core orbitals. These shifts correspond to a movement of the Fermi level within the HOMO LUMO
energy gap. The shifts in CuPc induced by the interaction with TCNQ are similar in the composites and in the interface
model experiment. At the interface an additional induced dipole potential can be measured. The interface-dipole plus the
Fermile level shift add up to the work function difference of pure CuPc and TCNQ. We conclude that TCNQ forms a
separate phase in CuPc rather than single isolated acceptor molecules. Charge transfer at the bulk hetero-junction
induces the Fermi level variations, which may be called doping.
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Thomas Mayer, Corinna Hein, Johanna Härter, Eric Mankel, Wolfram Jaegermann, "A doping mechanism for organic semiconductors derived from SXPS measurements on co-evaporated films of CuPc and TCNQ and on a TCNQ/CuPc interface," Proc. SPIE 7052, Organic Photovoltaics IX, 705204 (26 August 2008); https://doi.org/10.1117/12.794606