Electrostatic field effect on molecular structures at metal surfaces

Guo, Wei; Du, Shixuan; Zhang, Yu-Yang; Hofer, Werner A.; Seidel, Christian; Chi, Lifeng; Fuchs, Harald; Gao, Hongjun

doi:10.1016/j.susc.2009.07.031

Cited by 13 publications

(21 citation statements)

References 37 publications

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“…Small differences in appearance between red and green pairs then probably result from differences in epitaxial registry, similar to what was found for PTCDA 45 and other small molecules. 19 Indeed, the red and green BOPA-PDCA pairs within one domain cannot have the same epitaxial registry in view of their respective orientation with respect to the Au(111) lattice.…”

Section: Resultsmentioning

confidence: 99%

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Monolayer Phases of a Dipolar Perylene Derivative on Au(111) and Surface Potential Build-Up in Multilayers

et al. 2016

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9-(Bis-p-tert-octylphenyl)-amino-perylene-3,4-dicarboxy anhydride (BOPA-PDCA) is a strongly dipolar molecule representing a group of asymmetrically substituted perylenes that are employed in dye-sensitized solar cells and hold great promise for discotic liquid crystal applications. Thin BOPA-PDCA films with orientated dipole moments can potentially be used to tune the energy-level alignment in electronic devices and store information. To help assessing these prospects, we here elucidate the molecular self-assembly and electronic structure of BOPA-PCDA employing room temperature scanning tunneling microscopy and spectroscopy in combination with ultraviolet and X-ray photoelectron spectroscopies. BOPA-PCDA monolayers on Au(111) exclusively form in-plane antiferroelectric phases. The molecular arrangements, the increase of the average number of molecules per unit cell via ripening, and the rearrangement upon manipulation with the STM tip indicate an influence of the dipole moment on the molecular assembly and the rearrangement. A slightly preferred out-of-plane orientation of the molecules in the multilayer induces a surface potential of 1.2 eV. This resembles the giant surface potential effect that was reported for vacuum-deposited tris(8-hydroxyquinoline)aluminum and deemed applicable for data storage. Notably, the surface potential in the case of BOPA-PDCA can in part be reversibly removed by visible light irradiation.

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Section: Resultsmentioning

confidence: 99%

“…This energy is sucient to trigger structural transitions for weakly interacting systems. 19 We therefore…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 96%

Monolayer Phases of a Dipolar Perylene Derivative on Au(111) and Surface Potential Build-Up in Multilayers

et al. 2016

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“…STM permits injecting charge carriers very locally in the weak coupling limit, namely, in the tunneling regime. [28][29][30][31][32][33][34][35] Atomic force microscopy (AFM) in combined STM/AFM setups complements STM experiments by providing information of the molecular geometry-independent from the conductance. 36,37 In recent years, this has been applied to gain insight into the geometry changes associated with toggling single-molecule switches.…”

Section: General Introductionmentioning

confidence: 99%

Forces from periodic charging of adsorbed molecules

Kocić

Decurtins

Liu

et al. 2017

The Journal of Chemical Physics

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In a recent publication [Kocić et al., Nano Lett. 15, 4406 (2015)], it was shown that gating of molecular levels in the field of an oscillating tip of an atomic force microscope can enable a periodic charging of individual molecules synchronized to the tip’s oscillatory motion. Here we discuss further implications of such measurements, namely, how the force difference associated with the single-electron charging manifests itself in atomic force microscopy images and how it can be detected as a function of tip-sample distance. Moreover, we discuss how the critical voltage for the charge-state transition depends on distance and how that relates to the local contact potential difference. These measurements allow also for an estimate of the absolute tip-sample distance.

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“…Interestingly, there is only one orientation in each scanning run, indicating that the azimuth and tilt angles of the phenyl rings can be affected by an external electric eld, due to their large polarizability. [41][42][43] Under a lateral electric eld (for example, induced in our case by an asymmetrically charged tip covered by molecules), the azimuth angle of the phenyl ring can be tuned, leading to the uniform orientation, whereas the identical tilt angle of the phenyl rings in Fig. 2k and i will dissimilate.…”

Section: Resultsmentioning

confidence: 94%