Experimental determination of the attenuation length of electrons in organic molecular solids: The example of PTCDA

Graber, Tina; Förster, Frank; Schöll, A.; Reinert, F.

doi:10.1016/j.susc.2011.01.033

Cited by 59 publications

(41 citation statements)

References 41 publications

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“…The attenuation of the emitted electrons corresponds to an inelastic mean free path of less than 1 nm, which is clearly different from a high value expected for very low kinetic energies in the so-called ''universal curve''. 25,26 The deposition at 420 K (top row) indicates a classic StranskiKrastanov behaviour, in agreement with ex situ AFM, 27 in situ SPA-LEED, 12 and grazing-incidence XRD-measurements. 12 First a complete monolayer is formed (Fig.…”

Section: Direct Observation Of Stranski-krastanov Growthsupporting

confidence: 77%

Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

Marchetto

Schmidt

Groh

et al. 2015

Phys. Chem. Chem. Phys.

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The growth of the first ten layers of organic thin films on a smooth metallic substrate has been investigated in real-time using the model system PTCDA on Ag(111). The complex behaviour is comprehensively studied by electron microscopy, spectroscopy and diffraction in a combined PEEM/LEEM instrument revealing several new phenomena and yielding a consistent picture of this layer growth. PTCDA grows above room temperature in a Stranski-Krastanov mode, forming three-dimensional islands on a stable bi-layer, in competition with metastable 3rd and 4th layers. Around room temperature this growth mode changes into a quasi layer-by-layer growth, while at temperatures below about 250 K a Vollmer-Weber-like behaviour is observed. By means of laterally resolved soft X-ray absorption spectroscopy the orientation of all adsorbed molecules is found to be homogeneously flat lying on the surface, even during the growth process. The films grow epitaxially, showing long-range order with rotational domains. For the monolayer these domains could be directly analysed, showing an average size of several micrometers extending over substrate steps.

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Section: Direct Observation Of Stranski-krastanov Growthsupporting

confidence: 77%

Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

Marchetto

Schmidt

Groh

et al. 2015

Phys. Chem. Chem. Phys.

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“…The electron mean free path here is much smaller than $2 nm measured for well-ordered PTCDA films on Ag(1 1 1) by Graber et al [26], probably because a-NPD films are amorphous, which increase electron inelastic scattering and shorten the electron mean free path [32]. On the contrary, C 1s peaks from a-NPD molecule at lower binding energies (between 283 eV and 285 eV) clearly demonstrate the two different thickness dependent changes.…”

Section: Resultscontrasting

confidence: 51%

The role of gap states on energy level alignment at an α-NPD/HAT(CN) 6 charge generation interface

Yang

Bussolotti

et al. 2015

Organic Electronics

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“…Coronene molecules were purified by sublimation and evaporated from a Knudsen cell at a pressure below 10 −8 mbar and at room temperature. Film thickness was determined by corelevel intensities of the adsorbate and the substrate, using the effective electron attenuation lengths given in [29]. eV.…”

Section: Methodsmentioning

confidence: 99%

Observation of a molecule–metal interface charge transfer related feature by resonant photoelectron spectroscopy

et al. 2015

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We report the discovery of a charge transfer (CT) related low binding energy feature at a moleculemetal interface by the application of resonant photoelectron spectroscopy (RPES). This interface feature is neither present for molecular bulk samples nor for the clean substrate. A detailed analysis of the spectroscopic signature of the low binding energy feature shows characteristics of electronic interaction not found in other electron spectroscopic techniques. Within a cluster model description this feature is assigned to a particular eigenstate of the photoionized system that is invisible in direct photoelectron spectroscopy but revealed in RPES through a relative resonant enhancement. Interpretations based on considering only the predominant character of the eigenstates explain the low binding energy feature by an occupied lowest unoccupied molecular orbital, which is either realized through CT in the ground or in the intermediate state. This reveals that molecule-metal CT is responsible for this feature. Consequently, our study demonstrates the sensitivity of RPES to electronic interactions and constitutes a new way to investigate CT at molecule-metal interfaces. B K ) [20-22]. If a case of intermediate localization is realized,

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Experimental determination of the attenuation length of electrons in organic molecular solids: The example of PTCDA

Cited by 59 publications

References 41 publications

Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

The role of gap states on energy level alignment at an α-NPD/HAT(CN) 6 charge generation interface

Observation of a molecule–metal interface charge transfer related feature by resonant photoelectron spectroscopy

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