Ambient Electronics

Sekitani, Tsuyoshi; Someya, Takao

doi:10.7567/jjap.51.100001

Cited by 32 publications

(10 citation statements)

References 92 publications

(81 reference statements)

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“…Organic thin-film transistors (TFTs) have been intensively studied toward their application to flexible, large-area, lightweight, and low-cost electronic devices. [1][2][3][4] The performance of organic TFTs including field-effect mobilities has been progressing for over ten years. [5][6][7] From the progress of the performance in organic TFTs, it is expected that organic TFTs are practically applied to logic circuits [8][9][10][11][12] and active matrix displays.…”

Section: Introductionmentioning

confidence: 99%

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Takahashi¹,

Hanafusa²,

Kimura³

et al. 2017

Jpn. J. Appl. Phys.

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Oxygen plasma treatment has been carried out to control the threshold voltage in organic thin-film transistors (TFTs) having a SiO2 gate dielectric prepared by rf sputtering. The threshold voltage linearly changed in the range of −3.7 to 3.1 V with the increase in plasma treatment time. Although the amount of change is smaller than that for organic TFTs having thermally grown SiO2, the tendency of the change was similar to that for thermally grown SiO2. To realize different plasma treatment times on the same substrate, a certain region on the SiO2 surface was selected using a shadow mask, and was treated with oxygen plasma. Using the process, organic TFTs with negative threshold voltages and those with positive threshold voltages were fabricated on the same substrate. As a result, enhancement/depletion inverters consisting of the organic TFTs operated at supply voltages of 5 to 15 V.

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Section: Introductionmentioning

confidence: 99%

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Takahashi¹,

Hanafusa²,

Kimura³

et al. 2017

Jpn. J. Appl. Phys.

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“…21) The solar cell exhibited a PCE of 4.2%, and its performance was almost equivalent to that of solar cells fabricated on glass substrates, which strongly suggests that flexible solar cells are one of the key components of ambient electronics. 22) On the other hand, an extremely high PCE of 7.4% has been reported for BHJ solar cells. 23) The cells were fabricated using a p-type semiconductor, poly [[4,8-bis[(2-ethylhexyl)oxy]benzo [1,2- [3,4-b]-thiophenediyl]] (PTB7), an n-type semiconductor, [6,6]-phenyl-C 71 -butyric-acid-methylester (PC 71 BM), and a Ca-coated Al cathode on an indium tin oxide (ITO)-coated glass substrate.…”

Section: Introductionmentioning

confidence: 99%

Improvement of bulk heterojunction organic solar cells based on PTB7:PC₆₁BM with small amounts of P3HT

Ohori

Fujii

Kataura

et al. 2015

Jpn. J. Appl. Phys.

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The effect of a small amount of poly(3-hexylthiophene) (P3HT) additive on the performance of bulk heterojunction (BHJ) organic solar cells based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]:[6,6]-phenyl-C61-butyric acid methyl ester (PTB7:PC61BM) was investigated. The optimized solar cell with 5% P3HT weight fraction showed a marked improvement, with an open-circuit voltage of 0.76 V, a short-circuit current density of 17 mA/cm2, a fill factor of 0.40, and a power conversion efficiency of 5.11%. A notable reduction in the domain sizes of the active layers with 5% P3HT weight fraction was observed by atomic force microscopy. This suggests that the interface area between the PTB7 and PC61BM domains increased, resulting in an enhanced exciton dissociation. This also suggests that the small amount of P3HT in the PTB7:PC61BM active layer acted as a mediator to enhance the hole current from PTB7 domains to the poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) anode buffer layer. Possible mechanisms for these phenomena are discussed on the basis of the results of surface energy analysis.

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“…As with the recent progress in wearable electronics that may make electronic devices ubiquitous in our lives, miniaturization of equipment for wound healing as a wearable patch will expand the use of electrical stimulation of wound healing for medical applications. A lightweight patch that fits to skin does not hinder motion of a living body thus more suitable to practical applications than conventional wired electric devices.…”

mentioning

confidence: 99%

Accelerated Wound Healing on Skin by Electrical Stimulation with a Bioelectric Plaster

Kai

Yamauchi

Ogawa

et al. 2017

Adv Healthcare Materials

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Wound healing on skin involves cell migration and proliferation in response to endogenous electric current. External electrical stimulation by electrical equipment is used to promote these biological processes for the treatment of chronic wounds and ulcers. Miniaturization of the electrical stimulation device for wound healing on skin will make this technology more widely available. Using flexible enzymatic electrodes and stretchable hydrogel, a stretchable bioelectric plaster is fabricated with a built-in enzymatic biofuel cell (EBFC) that fits to skin and generates ionic current along the surface of the skin by enzymatic electrochemical reactions for more than 12 h. To investigate the efficacy of the fabricated bioelectric plaster, an artificial wound is made on the back skin of a live mouse and the wound healing is observed for 7 d in the presence and absence of the ionic current of the bioelectric plaster. The time course of the wound size as well as the hematoxylin and eosin staining of the skin section reveals that the ionic current of the plaster leads to faster and smoother wound healing. The present work demonstrates a proof of concept for the electrical manipulation of biological functions by EBFCs.

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Ambient Electronics

Cited by 32 publications

References 92 publications

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Improvement of bulk heterojunction organic solar cells based on PTB7:PC₆₁BM with small amounts of P3HT

Accelerated Wound Healing on Skin by Electrical Stimulation with a Bioelectric Plaster

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Ambient Electronics

Cited by 32 publications

References 92 publications

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

Improvement of bulk heterojunction organic solar cells based on PTB7:PC61BM with small amounts of P3HT

Accelerated Wound Healing on Skin by Electrical Stimulation with a Bioelectric Plaster

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Improvement of bulk heterojunction organic solar cells based on PTB7:PC₆₁BM with small amounts of P3HT