Photovoltaic Effects of Retinal-Related Materials in Langmuir-Blodgett Films

Okazaki, Choichiro

doi:10.1143/jjap.37.983

Cited by 8 publications

(3 citation statements)

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“…Even so, one should note that the relative photoinduced response is much larger in the cRa than in the tRa films, a result consistent with the idea that the larger free volume in the former allows an easier molecular reorganization [8]. Hence, we can suppose that the observed differences in electrical responses are mainly due to the distinct intrinsic molecular distributions of the films [9]. Within the time scale of the experiment (2000 s), the photovoltaic behavior remained constant and the maximum observed voltage was reproducible.…”

Section: Resultssupporting

confidence: 71%

Photovoltaic Response of Ultrathin Films of Retinal Derivatives

Tenorio

Silva

Melo

2002

phys. stat. sol. (b)

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Langmuir-Blodgett mixed films of retinal derivatives and fatty acids deposited on conducting glass slides were used in the present study of the photovoltaic response of retinal derivatives. The presence of incident light can affect the compression isotherms of the Langmuir films of cis and trans retinal in a distinct manner by changing the intrinsic organization of the floating monolayer, and a definite difference in the photovoltaic response of the corresponding ultrathin films of retinal derivatives is observed.

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Section: Resultssupporting

confidence: 71%

Photovoltaic Response of Ultrathin Films of Retinal Derivatives

Tenorio

Silva

Melo

2002

phys. stat. sol. (b)

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“…59−61 In the AC regime, a simple single power-law conductance behavior is widely observed in diverse materials of physical and chemical different properties. This universal power law was given by Jonscher 62−65 (2) where G DC is the DC conductance, A 1 ′ is a temperaturedependent factor, ω is the angular frequency, and s is a power exponent dependent on temperature and ranging from 0 to 1. However, all materials do not conform to this simple behavior.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…In particular, biological materials have outstanding environmental and technical properties. Indeed, natural organic materials are eco-friendly, biodegradable, nontoxic, lightweight, mechanically flexible, and inexpensive, and they have potentially promising applications in logic and memory circuits, optoelectronics, photovoltaic devices, − and in medical, pharmaceutical, and food industry. − Furthermore, biological materials show efficient charge transport and a fast electrical and optical response, less than 5 ps. , They present intense optical absorption and emission and mixed electronic and ionic conduction . Organic materials exhibit semiconductor behavior.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical, and Electrical Characterization of Biological and Bioactive Propolis Films

Mezdari

Khirouni

2022

ACS Omega

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Natural substances are potential compounds for green electronic devices. So, scientists have to explore and optimize their properties to insert them as active layers in electronic heterostructures. In this study, microstructural, optical, and electrical properties of thin layers of the propolis are investigated. Propolis is a biological organic bioactive material produced by honeybees. A stable, bioactive, green, and low-cost thin layer of this biocompatible material was deposited on different substrates using a propolis alcohol solution. The morphological studies show that the propolis thin film is dense and well covers the substrate surfaces. Transmittance spectra show that propolis film cuts off blue and ultraviolet (UV) radiation, which are responsible for food oxidation, nutrient losses, flavor degradation, and discoloration. Therefore, to prevent food deterioration, a propolis film can be used in food packaging. For red and near-infrared radiation (∼600–2700 nm), a propolis film is transparent. Between near-infrared and mid-infrared radiation (∼2700–3200 nm), a propolis film reveals significant photosensitivity and so can be used as a photosensor. The propolis film reveals an energy gap of 2.88 eV at room temperature, which enables potential optoelectronic applications in the UV and blue ranges. The electrical study shows that the propolis layer has semiconductor behavior and can be a potential active layer in biocompatible temperature sensors. In addition to its medical, pharmaceutical, and food industry applications, in light of this study, propolis presents amazing optical and electrical properties and is a promising candidate for food packaging, optoelectronics, transparent electronics, and bioelectronics.

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