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Controlling electronic properties of CdTe by adsorption of dicarboxylic acid derivatives: Relating molecular parameters to band bending and electron affinity changes


  • We thank R. Lazar for skillful assistance in the preparation of the dicarboxylic acids, L. Kronik for helpful discussions, and B. Mishori (TAU) for carrying out the SPS measurements. We are grateful to the Israeli Ministry of Science (MOS), the Forschungszentrum Jülich (KFA), the Minerva Foundation, Munich, and the Tashtyoth program of the MOS for support.


Surface modifications have great potential to control semiconductor properties such as band bending (BB) and electron affinity (EA). It is demonstrated that tailor-made, surface-binding molecules—discarboxylic acid derivatives with aromatic substituents in this case—can be used to modify systematically both the EA and BB of CdSe. The molecular parameters that affect each of these have been resolved and a semiquantitative model is put forward to rationalize the observed molecule-induced band-bending energies.

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