Effect of film thickness on topographic, microstructural, optical and dielectric behaviour of PPMBA thin films

Nasrin, Rahima; Kabir, Humayun; Akter, Hasina; Bhuiyan, A.H.

doi:10.1016/j.rinp.2020.103357

Cited by 12 publications

(7 citation statements)

References 59 publications

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“…On the other hand, for the angular frequencies greater than 10 4 rad s –1 , as the frequencies increase, the dielectric values decrease before becoming constant with a value corresponding to ε max at 3.7, which is the intrinsic dielectric constant of AnE-PVstat:PCBM, in agreement with the results of dielectric measurements reported for polymer nanocomposites . The decrease of the dielectric value vs the angular frequency is a phenomenon known as the anomalous dielectric dispersion and may be attributed to the electrical relaxation process . The same behavior was observed for the dielectric loss; at an angular frequency of less than 10 4 rad s –1 , this can be attributable to the deformation and relaxation polarization contributions .…”

Section: Results and Discussionsupporting

confidence: 86%

“…41 The decrease of the dielectric value vs the angular frequency is a phenomenon known as the anomalous dielectric dispersion and may be attributed to the electrical relaxation process. 42 The same behavior was observed for the dielectric loss; at an angular frequency of less than 10 4 rad s −1 , this can be attributable to the deformation and relaxation polarization contributions. 43 Afterward, for angular frequencies greater than 10 4 rad s −1 , as the frequency is increased, the value of ε″ becomes quasiconstant when reaching ∼4.7.…”

Section: Resultssupporting

confidence: 58%

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Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

et al. 2021

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We report on the enhancement in the efficiency of inverted polymer solar cells because of increased open-circuit voltage and short-circuit current by using an electron collecting an interfacial layer of an aluminum-doped zinc oxide (AZO). The efficiency of polymer solar cells comprising a bulk heterojunction photoactive film of an anthracene containing poly(p-aryleneethynylene)-alt-poly(p-arylenevinylene)/1-(3methoxycarbonyl)propyl-1-phenyl [6,6] and phenyl-C 60 -butyric acid methyl ester has increased from 3.6% to 4.6% from the standard to the inverted architecture with Al concentrations of 0.6%, respectively. After this concentration, the efficiency starts to decrease. The reasons for these results are discussed based on the AC electrical process and magnetoconductance (MC) measurements under open-circuit conditions at room temperature. The frequency ( f) dependence of the real part (Z′) and the imaginary part (Z′′) of the complex impedance with various Al concentrations at open-circuit conditions at room temperature show three f regimes: low, mid, and high f. The Cole−Cole plots (Z′′ vs Z′) demonstrate an increase in the semicircle radius from the standard to the inverted architectures for Al concentrations of 0.2% and 0.6%, respectively. After this concentration (0.6%), the semicircle radius starts to decrease. Afterward, the present proposed impedance model shows some important physical parameters such as electron diffusion time (τ diff ), the recombination time (τ rec ), the diffusion constant (D n ), the diffusion length (L n ), and the electron mobility (μ n ). From the dielectric measurements, all devices have a unique relaxation process, which is the property of the Debye relaxation mechanism. Moreover, the dielectric constant (ε′) showed a strong dependence on f and the type of architecture. In addition, the dielectric loss (ε″) decreased significantly with f, and as a result, it has sparked a lot of interest in these materials' possible uses in electrical energy storage. The dielectric loss tangent (tan(δ))) peaks shifted a little bit toward higher f from the standard to the inverted structures, indicating reduction of relaxation time. Furthermore, we found an MC memory effect in the inverted cells. Then the mechanism responsible for the MC was determined with the current density versus the applied voltage in the log−log scale for the different elaborated cells at V OC . The results suggested that the applied voltage (V OC ) corresponds to the trapped charge limited current (TCLC) regime, with traps acting as recombination centers for electron−hole (e−h) pairs, preventing the formation of double carriers MC. For this reason, the MC in the device may be described using a stochastic Liouville equation in the context of the e−h pair model.

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Section: Results and Discussionsupporting

confidence: 86%

Section: Resultssupporting

confidence: 58%

Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

et al. 2021

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“…Figure b represents the performance indicator comparison of reported polymer composites prepared for printed soft electronics applications. , The thickness of the sensing layer has a significant effect on the optical, flexibility, mechanical, and mobility properties of the thin film composites . Especially, if the nano ink can be coated homogeneously and uniformly, it becomes easier to control the film thickness, thus demonstrating considerable promise for soft electronics applications in terms of scalable production.…”

Section: Resultsmentioning

confidence: 99%

“…62,63 The thickness of the sensing layer has a significant effect on the optical, flexibility, mechanical, and mobility properties of the thin film composites. 64 Especially, if the nano ink can be coated homogeneously and uniformly, it becomes easier to control the film thickness, thus demonstrating considerable promise for soft electronics applications in terms of scalable production. In this study, the prepared e-graphene/AgNP-coated TA/SAP/GO blended PVA polymer composites show a 4.189 ± 0.175 kohm/sq.…”

Section: Demonstration Of Possiblementioning

confidence: 99%

Silver Nanoparticle-Assisted Electrochemically Exfoliated Graphene Inks Coated on PVA-Based Self-Healing Polymer Composites for Soft Electronics

Şimşek,

Ruhkopf,

Plachetka

et al. 2024

ACS Appl. Mater. Interfaces

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Smart sensors with self-healing capabilities have recently aroused increasing interest in applications in soft electronics. However, challenges remain in balancing the sensors' self-healing and compatibility between their sensing and substrate layers. This study evaluated several self-healing polymer substrates and graphene inkbased strain-sensing coatings. The optimum electrochemically exfoliated graphene (e-graphene)/silver nanoparticle-coated tannic acid (TA)/superabsorbent polymer/graphene oxide (GO) blended poly-(vinyl alcohol) polymer composites exhibited improvements of 47.1 and 39.2%, respectively, for the healing efficiency in a substrate crack area and in the graphene-based sensing layer due to conductive layer adhesion. While TA was found to improve healing efficiency on the coating surface by forming hydrogen bonds between the sensing and polymer layers, GO healed the polymer surface due to its ability to form bonds in the polymer matrix. The superabsorbent polymer was found to absorb excess water in e-graphene dispersion due to its host−guest interaction, while also reducing the coating thickness.

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“…It is evident that the surface roughness of the thinner films has been significantly improved compared to the thicker films. Thicker films are inherently rougher than thinner films . Thicker films have a higher concentration of atoms or molecules in the film.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on the Effects of O₂ Flow Rate on As-Deposited Polycrystalline IAZO Films

Ahmad,

Zhang,

et al. 2023

ACS Appl. Eng. Mater.

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The research on oxide semiconductor thin-film transistors (OSTFTs) is experiencing exponential growth worldwide, aimed at enhancing the mobility, stability, film quality, and device performance while reducing the density of defect states in the channel material. In our study, we investigated indium aluminum zinc oxide (IAZO) films with varying O 2 flow rates of 25, 17, 8, and 3 sccm to optimize the channel material. Interestingly, we observed that as the flow rate of the O 2 decreased, the deposition rate increased exponentially. However, when the O 2 flow rate was set to 3 sccm, the films exhibited an extremely high density of defect states, low surface roughness, and different crystalline phases, including Zn, Al 2 O 3 , and ZnO crystals oriented in various directions. On the other hand, films deposited with an O 2 flow rate of 8 sccm demonstrated the second-highest deposition rate with high film quality, indicating a trade-off between film quality and deposition rate. Our analysis using grazing incidence X-ray diffraction and ultraviolet photoelectron spectroscopy techniques revealed very high-quality films and a low density of defect states, respectively. Remarkably, we report for the first time the successful deposition of c-axis aligned crystalline (CAAC) IAZO films at room temperature with an O 2 flow rate of 8 sccm, which exhibited the second-highest deposition rate, high film quality, low density of defect states, a comparable electron affinity (χ = 3.53 eV) to IGZO, a very high mobility (244.65 cm 2 /V•s), and a suitable carrier concentration (3.25 × 10 18 cm −3 ). CAAC-IAZO can be a potential candidate to serve as a promising channel material for enhancing device performance and addressing stability concerns in OSTFTs.

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Effect of film thickness on topographic, microstructural, optical and dielectric behaviour of PPMBA thin films

Cited by 12 publications

References 59 publications

Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

Silver Nanoparticle-Assisted Electrochemically Exfoliated Graphene Inks Coated on PVA-Based Self-Healing Polymer Composites for Soft Electronics

Comparative Study on the Effects of O₂ Flow Rate on As-Deposited Polycrystalline IAZO Films

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Effect of film thickness on topographic, microstructural, optical and dielectric behaviour of PPMBA thin films

Cited by 12 publications

References 59 publications

Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

Static, Dynamic, Dielectric, and Magnetic Investigations on AnE-PVstat: PCBM Polymer Solar Cells under Open-Circuit Conditions

Silver Nanoparticle-Assisted Electrochemically Exfoliated Graphene Inks Coated on PVA-Based Self-Healing Polymer Composites for Soft Electronics

Comparative Study on the Effects of O2 Flow Rate on As-Deposited Polycrystalline IAZO Films

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Comparative Study on the Effects of O₂ Flow Rate on As-Deposited Polycrystalline IAZO Films