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Interdiffusion of molecular acceptors through organic layers to metal substrates mimics doping-related energy level shifts
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/content/aip/journal/apl/95/9/10.1063/1.3213547
2009-09-03
2014-11-22

Abstract

Photoemission measurements reveal energy level shifts toward the Fermi level when a strong electron acceptor (tetrafluoro-tetracyanoquinodimethane, F4-TCNQ) is deposited on pristine layers of -tris(-diphenyl-amino)triphenylamine (TDATA) or -bis(-carbazolyl)biphenyl (CBP). The shifts of the TDATA and CBP energy levels toward the Fermi level of the Au substrate could, in principle, arise from -type doping of the intrinsic organic layers. While this indeed takes place in TDATA, doping of CBP by F4-TCNQ, i.e., charge transfer complex formation, does not occur. The shifts observed in CBP arise from the diffusion of F4-TCNQ toward the Au substrate, which modifies the buried metal surface potential, leading to a realignment of the energy levels of the organic overlayer.

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Scitation: Interdiffusion of molecular acceptors through organic layers to metal substrates mimics doping-related energy level shifts
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/9/10.1063/1.3213547
10.1063/1.3213547
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