Quantum confinement and anisotropy in thin-film molecular semiconductors

Muller, Eric A.; Johns, James E.; Caplins, Benjamin W.; Harris, Charles B.

doi:10.1103/physrevb.83.165422

Cited by 13 publications

(16 citation statements)

References 34 publications

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“…In the latter case, a similar charge transfer from the dopants to the host molecules occurs, but the coupling between the molecules is not significantly amplified 8,40 . A coupling of molecular induced states was also reported 41,42 , where the formation of molecular networks leads to quantum wells of the substrate electrons present at the surface that might be backscattered or coupled, but the states of the molecular semiconductor itself are not regarded.…”

Section: Discussionmentioning

confidence: 99%

Substrate-mediated band-dispersion of adsorbate molecular states

et al. 2013

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Charge carrier mobilities in molecular condensates are usually small, as the coherent transport, which is highly effective in conventional semiconductors, is impeded by disorder and the small intermolecular coupling. A significant band dispersion can usually only be observed in exceptional cases such as for p-stacking of aromatic molecules in organic single crystals. Here based on angular resolved photoemission, we demonstrate on the example of planar p-conjugated molecules that the hybridization with a metal substrate can substantially increase the delocalization of the molecular states in selective directions along the surface. Supported by ab initio calculations we show how this mechanism couples the individual molecules within the organic layer resulting in an enhancement of the in-plane charge carrier mobility.

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Section: Discussionmentioning

confidence: 99%

Substrate-mediated band-dispersion of adsorbate molecular states

et al. 2013

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“…For the position of the LUMO, it can be determined by other techniques such as inverse photoemission spectroscopy (IPES) and two-photon photoemission [89][90][91][92][93][94] or simply be estimated from the addition of the transport band gap to the HOMO. The EA and EIB can be derived subsequently.…”

Section: Experimental Technique: Ultraviolet Photoelectron Spectrosco...mentioning

confidence: 99%

“…The EA and EIB can be derived subsequently. 13,15,18,26,72,[89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107] 5. ELA at the small-molecule based OOH interfaces…”

Section: Experimental Technique: Ultraviolet Photoelectron Spectrosco...mentioning

confidence: 99%

The role of gap states in the energy level alignment at the organic–organic heterojunction interfaces

Zhong

Mao

et al. 2012

Phys. Chem. Chem. Phys.

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The interface properties of organic-organic heterojunctions (OOHs), such as interface energy level alignment (ELA), interfacial charge transfer, interface nanostructuring, molecular orientation and so on, play an essential role in determining the device performance for some technologically important organic electronic devices, encompassing organic solar cells, bipolar organic field-effect-transistors, and organic light-emitting-diodes. The aim of this article is to provide a balanced assessment on the understanding of the ELA at the small-molecule based OOH interfaces with well-defined molecular orientation, with particular emphasis on the role of gap states in organic thin films. A generalized picture of gap states determined ELA at the OOH interfaces is provided and their implications in relevant organic electronic devices have been discussed.

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“…23,24 The modifications of IPS by periodic potential are also reported for several organic-metal interfaces. 25,26 As for the benzene covered Cu(111) surface, two types of IPS were observed: free-electron like IPS on the benzene monolayer and modulated IPS on the benzene bilayer. The modulated IPS for bilayer film was reproduced by a Kronig-Penny model.…”

Section: Image Potential States On 1 ML Pbpc Filmsmentioning

confidence: 99%

Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film

Yamamoto

Yamada

Taguchi

et al. 2012

Phys. Chem. Chem. Phys.

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Dispersions of image potential states on a graphite surface (denoted IPS1) and on 1 monolayer (ML) film (denoted IPS2) of lead phthalocyanine (PbPc) are investigated by the micro-spot angle-resolved two-photon photoemission (micro-AR-2PPE) spectroscopy. On the graphite surface, whole dispersions of the two members of IPS1 (n = 1 and 2) are observed. The n = 1 IPS1 peak is weakly visible at energy higher than the vacuum level. The effective mass of an electron in the n = 1 IPS1 becomes slightly light at the high momentum region, suggesting the interaction between the IPS1 and the unoccupied σ-band of graphite. On the PbPc film, the IPS2 band forms a band gap and back-folds at the boundary of the Brillouin zone. A 1-dimensional Kronig-Penny model is used to reproduce the effective mass and the shift of binding energy.

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Quantum confinement and anisotropy in thin-film molecular semiconductors

Cited by 13 publications

References 34 publications

Substrate-mediated band-dispersion of adsorbate molecular states

Substrate-mediated band-dispersion of adsorbate molecular states

The role of gap states in the energy level alignment at the organic–organic heterojunction interfaces

Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film

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