Persistent photoexcitation effect on the poly(3-hexylthiophene) film: Impedance measurement and modeling

Kim, Chang‐Hyun; Kisiel, Krzysztof; Jung, Jarosław; Ulański, Jacek; Tondelier, Denis; Geffroy, Bernard; Bonnassieux, Yvan; Horowitz, Gilles

doi:10.1016/j.synthmet.2011.12.021

Cited by 29 publications

(13 citation statements)

References 30 publications

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“…R lbm and C lbm are the resistance and capacitance of the supported lipid bilayer produced at below the Tm of the lipids. There is an additional distribution of ions which reflects the non-ideal behavior of a system and is commonly expressed as constant phase element (CPE) [ 31 , 32 ]. Therefore, in the same equivalent circuit, additional parallel RC elements (R edl and Q edl ) are introduced in series with parallel RC elements of membrane (R lbm and C lbm ).…”

Section: Resultsmentioning

confidence: 99%

“…Here, R edl and Q edl are the charge transfer resistance and capacitance of electric double layer (EDL) formed at the interface between the membrane and the electrolyte. Here, Q edl is treated as Y CPE (ω) = Y 0 (iω) α [ 31 , 32 ], where Y 0 and n (0 < α < 1) are the CPE coefficient and exponent, respectively. Q edl is estimated as a pure capacitance when is α close to 1 and a pure resistance when α is close to 0.…”

Section: Resultsmentioning

confidence: 99%

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Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

et al. 2017

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Supported lipid bilayers (SLBs) are widely used in biophysical research to probe the functionality of biological membranes and to provide diagnoses in high throughput drug screening. Formation of SLBs at below phase transition temperature (Tm) has applications in nano-medicine research where low temperature profiles are required. Herein, we report the successful production of SLBs at above—as well as below—the Tm of the lipids in an anisotropically etched, silicon-based micro-cavity. The Si-based cavity walls exhibit controlled temperature which assist in the quick and stable formation of lipid bilayer membranes. Fusion of large unilamellar vesicles was monitored in real time in an aqueous environment inside the Si cavity using atomic force microscopy (AFM), and the lateral organization of the lipid molecules was characterized until the formation of the SLBs. The stability of SLBs produced was also characterized by recording the electrical resistance and the capacitance using electrochemical impedance spectroscopy (EIS). Analysis was done in the frequency regime of 10−2–105 Hz at a signal voltage of 100 mV and giga-ohm sealed impedance was obtained continuously over four days. Finally, the cantilever tip in AFM was utilized to estimate the bilayer thickness and to calculate the rupture force at the interface of the tip and the SLB. We anticipate that a silicon-based, micron-sized cavity has the potential to produce highly-stable SLBs below their Tm. The membranes inside the Si cavity could last for several days and allow robust characterization using AFM or EIS. This could be an excellent platform for nanomedicine experiments that require low operating temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

et al. 2017

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“…Graphene is also readily oxidized in the ambient air to become apparently p-doped. This effect is similar to oxygen doping of organic semiconductors [ 36 , 37 ], and this tendency explains the deviation of the minimum conductance point in many graphene FETs from zero V G . An effective encapsulation can minimize further air-induced doping and shift of transfer curves [ 38 ].…”

Section: Basic Conceptsmentioning

confidence: 70%

Nanostructured Graphene: An Active Component in Optoelectronic Devices

Kim

2018

Nanomaterials

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Nanostructured and chemically modified graphene-based nanomaterials possess intriguing properties for their incorporation as an active component in a wide spectrum of optoelectronic architectures. From a technological point of view, this aspect brings many new opportunities to the now well-known atomically thin carbon sheet, multiplying its application areas beyond transparent electrodes. This article gives an overview of fundamental concepts, theoretical backgrounds, design principles, technological implications, and recent advances in semiconductor devices that integrate nanostructured graphene materials into their active region. Starting from the unique electronic nature of graphene, a physical understanding of finite-size effects, non-idealities, and functionalizing mechanisms is established. This is followed by the conceptualization of hybridized films, addressing how the insertion of graphene can modulate or improve material properties. Importantly, it provides general guidelines for designing new materials and devices with specific characteristics. Next, a number of notable devices found in the literature are highlighted. It provides practical information on material preparation, device fabrication, and optimization for high-performance optoelectronics with a graphene hybrid channel. Finally, concluding remarks are made with the summary of the current status, scientific issues, and meaningful approaches to realizing next-generation technologies.

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“…31,32 Going to the conclusion part of this article, it should be stressed that not a lot of work is dedicated to investigate the polymers by impedance spectroscopy. For example, the effect of device annealing was studied for BHJ solar cells made from the blends of poly[2-methoxy,5-(2-ethylhexoxy)-1,4-phenylene vinylene (MEH-PPV) and CdS (cadmium sulfide) by Huang et al 33 Kim et al 34 reported on the EC modeling of the relaxation behavior of an optically excited thick poly(3-hexylthiophene) (P3HT) film by means of impedance spectroscopy. In 34 simple device with a P3HT layer sandwiched between top and bottom Au electrodes was investigated.…”

Section: Impedance Spectroscopymentioning

confidence: 99%

Opto(electrical) properties of triphenylamine-based polyazomethine and its blend with [6,6]-phenyl C₆₁ butyric acid methyl ester

Iwan

Palewicz

Chuchmała

et al. 2013

High Performance Polymers

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Polyazomethine (OFBF-TPA) based on triphenylamine (TPA) and octafluorobiphenyl (OFBF) moieties was tested as donor-acceptor (D-A) for bulk heterojunction polymeric solar cells. The temperatures of 5% weight loss (T 5% ) of the polyazomethine range from 323 to 328 C, depending on the gas used (air and nitrogen). The conductivity of OFBF-TPA was approximately 10 À10 S/cm for not annealed sample and at about 10 À6 S/cm for the ones annealed at room temperature, as determined by impedance spectroscopy. Surface of the polymer and mixture polymer-[6,6]-phenyl C 61 butyric acid methyl ester (PCBM) was smooth with the R ms value in the range 0.58-1.95 nm as was detected by the atomic force microscopy (AFM) technique. UV-vis spectrum of the mixture OFBF-TPA-PCBM exhibited higher absorption intensity than the UV-vis spectrum of OFBF-TPA lacking PCBM. The thin solid film of OFBF-TPA and OFBF-TPA-PCBM showed one main absorption band with a maximum peak at 414 and 411 nm, respectively. For the mixture OFBF-TPA-PCBM, the second absorption band at 333 nm was found. No influence of annealing on the absorption properties was observed. The polymer solar cell devices were fabricated by spin coating the blend solution of the OFBF-TPA and PCBM and investigated in dark and under an illumination of 100 mW/cm 2 , with an AM1.5 G. Electrical behavior of the device indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) (PEDOT)-poly(styrenesulfonate) (PSS)/OFBF-TPA-PCBM/Al was tested by impedance spectroscopy in dark and under illumination. For all measured devices, Nyquist plots were presented. The annealing significantly improved the electrical conductivity of the investigated devices. Electrical and photovoltaic properties of OFBF-TPA were compared with the properties of polyazomethine based on TPA and fluorene moieties (F-TPA).

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Persistent photoexcitation effect on the poly(3-hexylthiophene) film: Impedance measurement and modeling

Cited by 29 publications

References 30 publications

Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

Nanostructured Graphene: An Active Component in Optoelectronic Devices

Opto(electrical) properties of triphenylamine-based polyazomethine and its blend with [6,6]-phenyl C₆₁ butyric acid methyl ester

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Persistent photoexcitation effect on the poly(3-hexylthiophene) film: Impedance measurement and modeling

Cited by 29 publications

References 30 publications

Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

Lipid Bilayer Membrane in a Silicon Based Micron Sized Cavity Accessed by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy

Nanostructured Graphene: An Active Component in Optoelectronic Devices

Opto(electrical) properties of triphenylamine-based polyazomethine and its blend with [6,6]-phenyl C61 butyric acid methyl ester

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Product

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Opto(electrical) properties of triphenylamine-based polyazomethine and its blend with [6,6]-phenyl C₆₁ butyric acid methyl ester