Electrical properties of porphyrin-based switching devices

Koo, Ja Ryong; Lee, Hosik; Ha, Yunkyoung; Choi, Yoon-Hwa; Kim, Young Kwan

doi:10.1016/s0040-6090(03)00807-1

Cited by 29 publications

(16 citation statements)

References 6 publications

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“…Interestingly our investigation revealed that device based on compound 2 showed resistive bipolar switching behaviour in LB films. This kind of bipolar switching will play crucial role in future organic electronic devices especially in memory application …”

Section: Introductionmentioning

confidence: 99%

Effect of Functional Group on Electrical Switching Behaviour of an Imidazole Derivative in Langmuir‐Blodgett Film

et al. 2019

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Here we report the design and synthesis of an imidazole derivative namely 1-benzyl-2,4,5-triaryl imidazole (compound 2) and its switching behaviour assembled onto Langmuir-Blodgett (LB) films. Monolayer characteristic of compound 2 at the air-water interface has been studied by surface pressure vs area per molecule (π -A) isotherm, hysteresis analysis and insitu Brewster Angle Microscopy (BAM). These studies indicated the formation of stable floating Langmuir film at the water subphase. Atomic Force Microscopy (AFM) investigation confirmed the successful deposition of the Langmuir film onto solid substrate. Device consisted of 60 layers LB films of 2 showed resistive bipolar switching behaviour irrespective of the first applied bias voltage polarity. Observed bipolar switch-ing has been explained in terms of reduction -oxidation process. Due to the presence of strong reducible group (C = N) in the imidazole core, reduction -oxidation process takes place easily during bias. Presence of sharp reduction and oxidation peaks in the Cyclic Voltammetry (CV) measurement of 2 also supported this hypothesis. Presence of benzyl group with the imidazole core played the crucial rule in the reductionoxidation process and hence the switching behaviour. When benzyl group was replaced by a '-H' then bipolar switching was not observed. In that case oxidizable group N -H opposed the reduction process during bias. This type of bipolar switching is very promising for future technological applications in organic electronics.

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Section: Introductionmentioning

confidence: 99%

Effect of Functional Group on Electrical Switching Behaviour of an Imidazole Derivative in Langmuir‐Blodgett Film

et al. 2019

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“…This figure demonstrates that the hysteresis loop exists in the first and third quadrants and passes the (0,0) point; however, the hysteresis graphs have different shapes in general. A survey in the literature was done to find different shapes for hysteresis of molecular devices [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], some of which are shown in Fig. 4 with solid line (this figure demonstrates the simulation curves generated from the proposed model in dotted lines, which will be discussed later).…”

Section: Introduction To Hysteresis Of Molecular Electronicsmentioning

confidence: 99%

A Multiloop and Full Amplitude Hysteresis Model for Molecular Electronics

Sharifi

Bahrepour

2016

IEEE Trans. Comput.-Aided Des. Integr. Circuits Syst.

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Although molecular electronics is in its infancy, many significant advances have been reported in this field and, at present, it is necessary to study different types of materials that are potentially useful in molecular electronics and its properties. Experimental and theoretical studies have shown that almost all nanoscale devices such as molecular devices usually exhibit hysteresis characteristic due to various phenomena such as electron energy discreteness, electron tunneling, Coulomb blockade effects, etc. Some efforts have been made for modeling molecular electronics; however, not all of them support the hysteresis behavior. To the best knowledge of the authors, this paper for the first time proposes a general model for modeling the hysteresis behavior in molecular electronics. The proposed model is a HSPICE compatible circuit model and one of its main features is the ability to model both DC and AC behaviors of molecular electronic materials. The model can accept all amplitudes in the definite range, is continuous in the whole range and its parameters have minimum complexity resulting in maximum simplicity in terms of parameter extraction. Correct operation of the proposed circuit model and its accuracy are investigated by applying it to some hysteresis graphs reported in the literature, and the results are shown in the paper.Index Terms-Hysteresis phenomenon, behavioral model, molecular electronics. 0278-0070 (c)

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“…Organic materials with delocalized π‐electrons have received a great deal of attention because they exhibit large nonlinear optical responses , high value coefficients of visible light absorption , and unique electronic and redox properties . Porphyrins consist of a central tetrapyrrole macrocyclic ring (porphyrin) with large π‐electron delocalization, which is responsible for their optical limiting properties, such as ultrafast response capability and large third‐order nonlinearity .…”

Section: Introductionmentioning

confidence: 99%

Porphyrin migration and aggregation in a poly(methylmethacrylate) matrix

et al. 2013

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The aging of thin polymer films is interesting for the development of nonlinear optical media. In this study, the optical properties of porphyrin‐doped poly(methylmethacrylate) (PMMA) films are investigated before and after annealing. Both absorption and luminescence spectroscopies were used to characterize the changes that occurred during the thermal treatment. The surface and bulk characteristics of the doped films were also measured using atomic force microscopy, X‐ray‐induced photoelectron spectra, and DSC. We found that the aging of the thin polymer films led the porphyrin molecules to diffuse in the direction of the polymer surface. This led to the random formation of porphyrin aggregates on the surface, followed by absorption band shift and little luminescence quenching. These results suggest that porphyrin‐doped PMMA films could be used as long‐term stable active optical materials. POLYM. COMPOS., 35:665–670, 2014. © 2013 Society of Plastics Engineers

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Electrical properties of porphyrin-based switching devices

Cited by 29 publications

References 6 publications

Effect of Functional Group on Electrical Switching Behaviour of an Imidazole Derivative in Langmuir‐Blodgett Film

Effect of Functional Group on Electrical Switching Behaviour of an Imidazole Derivative in Langmuir‐Blodgett Film

A Multiloop and Full Amplitude Hysteresis Model for Molecular Electronics

Porphyrin migration and aggregation in a poly(methylmethacrylate) matrix

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