Reversible switching of single tin phthalocyanine molecules on the InAs(111)A 
surface

Nacci, Christophe; Kanisawa , K.; Fölsch , S.

doi:10.1088/0953-8984/24/39/394004

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Reversible switching of single tin phthalocyanine molecules on the InAs(111)A surface

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Nacci, Christophe
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Paul-Drude-Institut für Festkörperelektronik;

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Citation

Nacci, C., Kanisawa, K., & Fölsch, S. (2012). Reversible switching of single tin phthalocyanine molecules on the InAs(111)A surface. Journal of Physics: Condensed Matter, 24(39): 394004. doi:10.1088/0953-8984/24/39/394004.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-A0A6-1

Abstract

Individual tin phthalocyanine (SnPc) molecules adsorbed on the InAs(111)A surface were studied by low-temperature scanning tunnelling microscopy (STM) at 5 K. Consistently with the nonplanar molecular structure, SnPc adopts two in-plane adsorption geometries with the centre Sn atom either above (SnPc_up) or below (SnPc_down) the molecular plane. Depending on the current and bias applied to the tunnel junction, the molecule can be reversibly switched between the two conformations, implying a controlled transfer of the Sn atom through the molecular plane. The SnPc_down conformer is characterized by an enhanced surface bonding as compared to the SnPc_up conformer. SnPc_up molecules can be repositioned by the STM tip by means of lateral manipulation, whereas this is not feasible for SnPc_down molecules. The reversible switching process thus enables one to either laterally move the molecule or anchor it to the semiconductor surface.