On dielectric spectra of thin copper phthalocyanine films

Jarosz, G.; Signerski, R.; Brehmer, L.

doi:10.1016/j.tsf.2006.02.035

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…above 200 kHz can be addressed to a simple circuit composed of ideal resistance of R = 60 X and ideal capacitance of C = 1.7 nF connected in a series. Our previous investigations [19], as well as investigations presented in other works (e.g. [20]), indicate that this capacitance is pure geometric capacitance of a sample, while R is the real resistance of electrodes.…”

Section: Discussionsupporting

confidence: 56%

On doubts about Mott–Schottky plot of organic planar heterojunction in photovoltaic cell

Jarosz

2008

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 56%

On doubts about Mott–Schottky plot of organic planar heterojunction in photovoltaic cell

Jarosz

2008

Journal of Non-Crystalline Solids

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“…CuPc SML), ε 0 is the vacuum permittivity, and r is the disk radius. 13 From the literature, we find 7 > ε r > 2.1 for polycrystalline CuPc films, 59 which gives a cluster radius of 1.6 nm < r < 5.4 nm. For the in-plane CuPc dielectric constant (ε r = 13), 24,60 we find r = 0.8 nm.…”

Section: Resultsmentioning

confidence: 97%

Single-Electron Charging Effects in Hybrid Organic/Inorganic Nanomembrane-Based Junctions

et al. 2018

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The controllable transfer of a single electron in devices (SEDs) is one of the viable trends for a new generation of technology. However, novel applications demand innovative strategies to fabricate and evaluate SEDs. Here, we report a hybrid organic/inorganic SED that combines an ensemble of physisorbed, semiconducting molecular layers (SMLs) and Au nanoclusters embedded in the transport channel by in situ, field-induced metal migration. The SED is fabricated using an integrative platform based on rolled-up nanomembranes (rNMs) to connect ultrathin SMLs from the top, forming large-area tunnel junctions. The combination of high electric fields (1−4 MV/cm), electrode point contacts, low temperatures (10 K), and ultrathin molecular layers (<10 nm) lead to field-induced migration of Au electrode nanoparticles inward the SML of the junction channel. This phenomenon can be either observed in the as-prepared rNM junctions or intentionally induced by the application of high electric fields (>1 MV/cm). The propelled electrode particles become trapped in the soft molecular material, acting as Coulomb islands positioned in between a double-barrier tunnel junction. As a result, the hybrid organic/inorganic rNM junctions present single-charge effects, namely Coulomb blockade and Coulomb staircase. Such an in situ, field-induced metal migration process opens possibilities to create novel and complex SEDs by using different molecular materials. From another perspective, the reported metal diffusion in such nanoscale junctions deserves attention as it can occasionally mask moleculedependent responses.

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“…To extract k CuPc , the thickness range 5-20 nm was used for simplicity. In this range, C h is given by equation (1): For the range of t CuPc analyzed (5-20 nm), k CuPc was found 4.5±0.5, slightly higher than the values reported for μm thick CuPc layers [38,39]. Considering that k CuPc depends on the molecular orientation [40][41][42], whereas the in-plane k CuPc is 10-20 and the perpendicular one is much lower (approximately 2-3.4), our values suggest a mild contribution of the in-plane field-induced dipole of CuPc to the measured k CuPc values.…”

Section: Resultsmentioning

confidence: 70%

“…For example, Saleh et al [37] obtained k CuPc ∼2.2 for a 0.4 μm thick layer, while Hamam et al [38] characterized CuPc layers and some derivatives of approximately 50 μm thickness, obtaining k CuPc ∼5.8. Jarosz et al [39] measured k CuPc values of approximately 3.5 for films thicker than 100 nm. At the molecular scale, k CuPc has been theoretically predicted though [40][41][42].…”

Section: Introductionmentioning

confidence: 98%

Hybrid nanomembrane-based capacitors for the determination of the dielectric constant of semiconducting molecular ensembles

et al. 2018

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Considerable advances in the field of molecular electronics have been achieved over the recent years. One persistent challenge, however, is the exploitation of the electronic properties of molecules fully integrated into devices. Typically, the molecular electronic properties are investigated using sophisticated techniques incompatible with a practical device technology, such as the scanning tunneling microscopy. The incorporation of molecular materials in devices is not a trivial task as the typical dimensions of electrical contacts are much larger than the molecular ones. To tackle this issue, we report on hybrid capacitors using mechanically-compliant nanomembranes to encapsulate ultrathin molecular ensembles for the investigation of molecular dielectric properties. As the prototype material, copper (II) phthalocyanine (CuPc) has been chosen as information on its dielectric constant (k ) at the molecular scale is missing. Here, hybrid nanomembrane-based capacitors containing metallic nanomembranes, insulating AlO layers, and the CuPc molecular ensembles have been fabricated and evaluated. The AlO is used to prevent short circuits through the capacitor plates as the molecular layer is considerably thin (<30 nm). From the electrical measurements of devices with molecular layers of different thicknesses, the CuPc dielectric constant has been reliably determined (k = 4.5 ± 0.5). These values suggest a mild contribution of the molecular orientation on the CuPc dielectric properties. The reported nanomembrane-based capacitor is a viable strategy for the dielectric characterization of ultrathin molecular ensembles integrated into a practical, real device technology.

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On dielectric spectra of thin copper phthalocyanine films

Cited by 11 publications

References 15 publications

On doubts about Mott–Schottky plot of organic planar heterojunction in photovoltaic cell

On doubts about Mott–Schottky plot of organic planar heterojunction in photovoltaic cell

Single-Electron Charging Effects in Hybrid Organic/Inorganic Nanomembrane-Based Junctions

Hybrid nanomembrane-based capacitors for the determination of the dielectric constant of semiconducting molecular ensembles

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