Charge transport in organic nanocrystal diodes based on rolled-up robust nanomembrane contacts

Bandari, Vineeth Kumar; Varadharajan, Lakshmi; Xu, Longqian; Jalil, Abdur Rehman; Devarajulu, Mirunalini; Siles, Pablo F.; Zhu, Feng; Schmidt, Oliver G.

doi:10.3762/bjnano.8.129

Cited by 8 publications

(10 citation statements)

References 37 publications

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“…A more detailed description of the fabrication process is provided in the “Methods” section (also see Supplementary Fig. 4 ) and previous reports 32 – 34 . Figure 3b shows the microscope image of the device array, indicating the feasibility of integration as well as reproducibility, which are key ingredients for practical applications.…”

Section: Resultsmentioning

confidence: 99%

Integrated molecular diode as 10 MHz half-wave rectifier based on an organic nanostructure heterojunction

Bandari

Hantusch

et al. 2020

Nat Commun

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Considerable efforts have been made to realize nanoscale diodes based on single molecules or molecular ensembles for implementing the concept of molecular electronics. However, so far, functional molecular diodes have only been demonstrated in the very low alternating current frequency regime, which is partially due to their extremely low conductance and the poor degree of device integration. Here, we report about fully integrated rectifiers with microtubular soft-contacts, which are based on a molecularly thin organic heterojunction and are able to convert alternating current with a frequency of up to 10 MHz. The unidirectional current behavior of our devices originates mainly from the intrinsically different surfaces of the bottom planar and top microtubular Au electrodes while the excellent high frequency response benefits from the charge accumulation in the phthalocyanine molecular heterojunction, which not only improves the charge injection but also increases the carrier density.

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Section: Resultsmentioning

confidence: 99%

Integrated molecular diode as 10 MHz half-wave rectifier based on an organic nanostructure heterojunction

Bandari

Hantusch

et al. 2020

Nat Commun

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“…Due to weak molecular interactions, the formation of crystalline or nanostructured organic systems can be tuned by controlling growth and processing conditions. Some of us have previously reported successful similar growth approaches with other material systems which lead to nanocrystalline organic structures with optimal electrical properties for device applications . This leads to totally different physical pictures when dealing with amorphous or polycrystalline organic materials .…”

Section: Resultsmentioning

confidence: 99%

“…Some of us have previously reported successful similar growth approaches with other material systems which lead to nanocrystalline organic structures with optimal electrical properties for device applications. [53,54] This leads to totally different physical pictures when dealing with amorphous or polycrystalline organic materials. [55,56] Similarly, the energy band bending and the charge accumulation layers are strongly dependent on the crystalline state of the organic system.…”

Section: Work Function Insights On Nanostructured Organic Systemsmentioning

confidence: 99%

Direct Imaging of Space‐Charge Accumulation and Work Function Characteristics of Functional Organic Interfaces

Siles

Devarajulu

Zhu

et al. 2018

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The tailoring of organic systems is crucial to further extend the efficiency of charge transfer mechanisms and represents a cornerstone for molecular device technologies. However, this demands control of electrical properties and understanding of the physics behind organic interfaces. Here, a quantitative spatial overview of work function characteristics for phthalocyanine architectures on Au substrates is provided via kelvin probe microscopy. While macroscopic investigations are very informative, the current approach offers a nanoscale spatial rendering of electrical characteristics which is not possible to attain via conventional techniques. Interface dipole is observed due to the formation of charge accumulation layers in thin F CuPc, F CoPc, and MnPc films, displaying work functions of 5.7, 6.1, and 5.0 eV, respectively. The imaging and quantification of interface locations with significant surface potential and work function response (<0.33 eV for material thickness <1 nm) show also a dependency on the crystalline state of the organic systems. The work function mapping suggests space-charge carrier regions of about 4 nm at the organic interface. This reveals rich spatial electric parameters and ambipolar characteristics that may drive electrical performance at device scales, opening a realm of possibilities toward the development of functional organic architectures and its applications.

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“…This issue has long plagued the molecular electronics field, hampering the development of novel devices in this research area. A Swiss‐roll architecture consisting of metallic nanomembranes possesses a smooth and robust surface plane, which can be used to gently contact molecules and nanostructures . These soft contacts are formed by rolling up strained metallic layers into tubular structures which then touch the top of the active material area ( Figure ).…”

Section: State‐of‐the‐art Self‐assembled Microelectronic Devicesmentioning

confidence: 99%

“…A Swiss-roll architecture consisting of metallic nanomembranes possesses a smooth and robust surface plane, which can be used to gently contact molecules and nanostructures. [176,187,[192][193][194][195] These soft contacts are formed by rolling up strained metallic layers into tubular structures which then touch the top of the active material area (Figure 11). In this way short cuts through pinholes are avoided and the intrinsic transport properties of organic molecular layers can be thoroughly studied (Figure 11a,b).…”

Section: Soft Contact Molecular Devicesmentioning

confidence: 99%

3D Self‐Assembled Microelectronic Devices: Concepts, Materials, Applications

et al. 2019

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www.advmat.de www.advancedsciencenews.com photolithography techniques. New amorphous semiconducting materials are involved in the development of flexible electronics based on high-performance compounds that include organic [82] and inorganic (e.g., copper oxide [83] or indium-gallium-zinc oxide (IGZO) [84] ) semiconductor possessing, for instance, the transparency [85] required in optoelectronic applications. Once fabricated on polymeric ultrathin substrates, these devices offer the flexibility, stretchability, and imperceptibility [85][86][87] for onskin (Figure 3 a,b,d) biomedical applications, such as biosensors capable of conformally wrapping a soft or irregularly shaped 3D biological sample such as a cancer cell or a pollen grain. [88] Demonstrating outstanding mechanical stability, thin-film materials, in particular semiconductors, are superior candidates for 3D applications compared to monocrystalline semiconductors. [87,89,90] Good examples are amorphous oxides and some organic molecular semiconductors [82] (Figure 3b-d) which are particularly attractive for 3D self-assembled microelectronics. By employing substrates with a thickness in the micro-and submicrometer range (Figure 3) many issues associated with mechanical stress on the surface could be mitigated, demonstrating the increased robustness and reliability of thinfilm electronics. [87,89] Electronic skin (e-skin) (Figure 3a,b,d), for Adv. Mater. 2020, 32, 1902994 Adv. Mater. 2020, 32, 1902994 Figure 3. Thin-film flexible electronic devices and applications. a) Mechanical prosthesis with stretchable electronic skin. Adapted with permission. [97] Copyright 2014, Springer Nature. b) Schematics and photograph of imperceptible organic electronics equipped with tactile active sensor matrix. Adapted with permission. [87] Copyright 2013, Springer Nature. c) Complex circuits with 8-bit microprocessors made of 3381 organic thin-film transistors. Adapted with permission. [98] Copyright 2012, IEEE. d) Ultrathin substrate combined with high-performance indium-gallium-zinc oxide (IGZO) circuitry paving the way for active medical devices on contact lenses. [85] Adapted with permission. [85] Copyright 2014, Springer Nature.

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Charge transport in organic nanocrystal diodes based on rolled-up robust nanomembrane contacts

Cited by 8 publications

References 37 publications

Integrated molecular diode as 10 MHz half-wave rectifier based on an organic nanostructure heterojunction

Integrated molecular diode as 10 MHz half-wave rectifier based on an organic nanostructure heterojunction

Direct Imaging of Space‐Charge Accumulation and Work Function Characteristics of Functional Organic Interfaces

3D Self‐Assembled Microelectronic Devices: Concepts, Materials, Applications

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