scholarly journals Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1565 ◽  
Author(s):  
Hea-Lim Park ◽  
Min-Hoi Kim ◽  
Hyeok Kim
Keyword(s):  
Light Absorption ◽  
High Performance ◽  
Gate Insulator ◽  
Charge Accumulation ◽  
Electron Hole ◽  
Gate Insulators ◽  
Physical Description ◽  
Light Absorbance ◽  
Lower Capacitance ◽  
Bulk Effect

In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and light-absorbance capabilities of a photoresponsive gate insulator was investigated. Although an OPT with a thicker gate insulator exhibits a lower capacitance and hence a lower accumulation capability of photogenerating charges, a thicker poly(4-vinylphenol) layer, in contrast to a thinner one, absorbs more photons to generate more electron–hole pairs, resulting in a higher photoresponse of the device. That is, in these two cases, the degree of light absorption by the photoresponsive gate insulators dominantly governed the photoresponse of the device. Our physical description of the bulk effect of photoresponsive insulators on the performance of OPTs will provide a useful guideline for designing and constructing high-performance organic-based photosensing devices and systems.

Degradable ultrathin high-performance photocatalytic hydrogen generator from porous electrospun composite fiber membrane with enhanced light absorption ability

2021 ◽  
Author(s):  
Qian-Yu Wang ◽  
Zheng-Min Zhang ◽  
Lin Liu ◽  
Lu Bai ◽  
Rui-Ying Bao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Light Absorption ◽  
High Performance ◽  
Composite Fiber ◽  
Channel Structure ◽  
Separation Mechanism ◽  
Hydrogen Generator ◽  
Fiber Membrane ◽  
Breath Figure ◽  
Phase Separation Mechanism

Poly(L-lactide) (PLA)/TiO2/Pt composite fiber membrane with internal porous channel structure is fabricated by skillfully tuning the breath figure mechanism and vapor induced phase separation mechanism with solute and solvent matching...

Surface grafting of octylamine onto poly(ethylene-alt-maleic anhydride) gate insulators for low-voltage DNTT thin-film transistors

2016 ◽  
Vol 18 (12) ◽  
pp. 8522-8528 ◽  
Author(s):  
Yun-Seo Choe ◽  
Mi Hye Yi ◽  
Ji-Heung Kim ◽  
Yun Ho Kim ◽  
Kwang-Suk Jang
Keyword(s):  
Thin Film ◽  
Maleic Anhydride ◽  
Thin Film Transistors ◽  
Low Voltage ◽  
Gate Insulator ◽  
Surface Grafting ◽  
Gate Insulators ◽  
Poly Ethylene

We report the surface grafting of octylamine onto a poly(ethylene-alt-maleic anhydride) (PEMA) gate insulator for enhancing the performance of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) thin-film transistors.

Modification of a polymer gate insulator by zirconium oxide doping for low temperature, high performance indium zinc oxide transistors

RSC Advances ◽  
2014 ◽  
Vol 4 (86) ◽  
pp. 45742-45748 ◽  
Author(s):  
Byeong-Geun Son ◽  
So Yeon Je ◽  
Hyo Jin Kim ◽  
Jae Kyeong Jeong
Keyword(s):  
Zinc Oxide ◽  
Low Temperature ◽  
Zirconium Oxide ◽  
High Performance ◽  
Gate Insulator ◽  
Indium Zinc Oxide

scholarly journals Synthesis and characterization of Z-scheme heterostructure CoWO4/g-C3N4 as a visible-light photocatalyst for removal of organic pollutant

2021 ◽  
Vol 10 (2) ◽  
pp. 59-63
Author(s):  
Hai Pham Viet ◽  
Anh Dao Thi Ngoc ◽  
Viet Nguyen Minh ◽  
Ha Tran Thi Viet ◽  
Dang Do Van ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
High Performance ◽  
Organic Pollutant ◽  
Photogenerated Electron ◽  
Morphological Properties ◽  
Electron Hole ◽  
Visible Light Photocatalyst ◽  
Photocatalytic Activities

In this study, direct Z–scheme heterostructure CoWO4/g-C3N4 was synthesized by a facile hydrothermal method. The structural, morphological properties of the prepared samples were characterised by XRD, SEM, UV–Vis and PL measurements. The as-obtained heterostructure CoWO4/g-C3N4 exhibited enhanced photocatalytic activities toward the degradation of Rhodamine B under visible light irradiation with 92% Rhodamine B removal after 80 minutes irritation, which exceeded pristine g-C3N4 and CoWO4. The enhanced photocatalytic performance ascribed to interfacial contact between g-C3N4 and CoWO4, thus further inhibiting the recombination of photogenerated electron/hole pairs. It is anticipated that the construction of Z–scheme heterostructure CoWO4/g-C3N4 is an effective strategy to develop high-performance photocatalysts for the degradation of organic pollutants in water.

All-metal meta-surfaces for narrowband light absorption and high performance sensing

2016 ◽  
Vol 49 (44) ◽  
pp. 445104 ◽  
Author(s):  
Zhengqi Liu ◽  
Guiqiang Liu ◽  
Guolan Fu ◽  
Xiaoshan Liu ◽  
Zhenping Huang ◽  
...  
Keyword(s):  
Light Absorption ◽  
High Performance

Synthesis and Photocatalytic Properties of the Bi2MoO6 and Bi2WO6 Photocatalysts

2018 ◽  
Vol 768 ◽  
pp. 218-223
Author(s):  
Juan Xia ◽  
Lin Zhang ◽  
Qi Wang
Keyword(s):  
Light Absorption ◽  
Hydrothermal Reaction ◽  
Organic Dyes ◽  
High Surface ◽  
Diffuse Reflectance Spectrum ◽  
High Surface Area ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
One Pot

Two different Bi-based semiconductor photocatalysts Bi2MoO6 and Bi2WO6 were synthesized by a simple one-pot hydrothermal reaction at 453 K for 10 h. The properties of the photocatalysts, including structures, morphology, light-absorption band and photoluminescence, etc were characterized by X-ray diffraction, scanning electron microscopy, UV-Vis diffuse reflectance spectrum and fluorescence spectrum. Further, their photocatalytic properties were compared by the degradation of two different organic dyes: Rhodamine B and methylene blue. It is important to note that the Bi2WO6 nanoplate structure exhibited better photocatalytic activity than the Bi2MoO6 nanowires aggregates due to its high surface area, higher light absorption and lower recombination of electron-hole pairs.

CeO2 Nanocrystal Decorated TiO2 Nanobelt with Enhanced Photocatalytic Performance

2021 ◽  
Vol 21 (4) ◽  
pp. 2647-2652
Author(s):  
Yanchen Ji ◽  
Guoxin Song ◽  
Ruiqi Yang ◽  
Longhua Ding ◽  
Aizhu Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Treatment ◽  
Light Absorption ◽  
High Performance ◽  
Photocatalytic Performance ◽  
Synthesis Method ◽  
Charge Carriers ◽  
Controllable Synthesis ◽  
Visible Light Absorption ◽  
Potential Applications

In this work, CeO2 nanocrystal-decorated TiO2 nanobelt for forming a CeO2@TiO2 heterostructure. CeO2 plays a dual role in improving photocatalytic activity, not only by promoting the separation and transfer of photogenerated charge carriers, but also by increasing visible light absorption of the photocatalyst as a photosensitizer. The as-prepared CeO2@TiO2 heterostructure demonstrates the performance of organic degradation and H2 production (about 17 μmol/h/g, which is about 2.5 times higher than that of pure TiO2 nanobelts). Our work provides a facile and controllable synthesis method for high performance photocatalyst, which will have potential applications in synthesis clean/solar fuel, and photocatalytic water treatment.

A high-performance cupric oxide photocatalyst with palladium light trapping nanostructures and a hole transporting layer for photoelectrochemical hydrogen evolution

2019 ◽  
Vol 7 (39) ◽  
pp. 22332-22345 ◽  
Author(s):  
Saeid Masudy-Panah ◽  
Reza Katal ◽  
Negar Dasineh Khiavi ◽  
Ehsan Shekarian ◽  
Jiangyong Hu ◽  
...  
Keyword(s):  
High Performance ◽  
Collection Efficiency ◽  
Cupric Oxide ◽  
Light Trapping ◽  
Photogenerated Electron ◽  
Limiting Factors ◽  
Electron Hole ◽  
Absorption Length ◽  
Charge Collection Efficiency ◽  
Hole Transporting

The high recombination rate of photogenerated electron–hole pairs, poor photocorrosion stability, and the discrepancy between the optical absorption length and charge collection efficiency of cupric oxide (CuO) are the main limiting factors of CuO photocatalysts.

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