Tunable UV response and high performance of zinc stannate nanoparticle film photodetectors

2016 ◽  
Vol 4 (25) ◽  
pp. 6176-6184 ◽  
Author(s):  
Caihong Liu ◽  
Adimali Piyadasa ◽  
Marcin Piech ◽  
Sameh Dardona ◽  
Zheng Ren ◽  
...  
Keyword(s):  
Visible Light ◽  
High Performance ◽  
Casting Process ◽  
Zinc Stannate ◽  
Uv Photodetectors ◽  
High Responsivity ◽  
Highly Efficient ◽  
Uv Response ◽  
First Time ◽  
Nanoparticle Film

A robust, inexpensive, and scalable drop-casting process was successfully developed to fabricate highly efficient and robust UV photodetectors with uniform and continuous films of ZnSnO3 and Zn2SnO4–SnO2 nanoparticles for the first time. An extreme high responsivity of ∼0.5 A W−1 at 5.0 V bias was achieved with good visible-light rejection.

Synthesis of single-crystalline GeS nanoribbons for high sensitivity visible-light photodetectors

2015 ◽  
Vol 3 (31) ◽  
pp. 8074-8079 ◽  
Author(s):  
Changyong Lan ◽  
Chun Li ◽  
Yi Yin ◽  
Huayang Guo ◽  
Shuai Wang
Keyword(s):  
Visible Light ◽  
Vapor Deposition ◽  
High Performance ◽  
Incident Light ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Single Crystalline ◽  
Promising Application ◽  
Photo Detection ◽  
First Time

Single-crystalline GeS nanoribbons were synthesized by chemical vapor deposition for the first time. The nanoribbon photodetectors respond to the entire visible incident light with a response edge at around 750 nm and a high responsivity, indicating their promising application for high performance broadband visible-light photo-detection.

A benzothiadiazole-based covalent organic framework for highly efficient visible-light driven hydrogen evolution

2020 ◽  
Vol 56 (83) ◽  
pp. 12612-12615
Author(s):  
Guang-Bo Wang ◽  
Sha Li ◽  
Cai-Xin Yan ◽  
Qian-Qian Lin ◽  
Fu-Cheng Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Covalent Organic Framework ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Organic Framework

A benzothiadiazole-based covalent organic framework, which can be a high-performance platform for efficient visible-light driven hydrogen evolution, is reported.

scholarly journals A Di-Carbazole-Based Dye as a Potential Sensitizer for Greenhouse-Integrated Dye-Sensitized Solar Cells

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1159
Author(s):  
Dimitris A. Chalkias ◽  
Christos Charalampopoulos ◽  
Stefania Aivali ◽  
Aikaterini K. Andreopoulou ◽  
Aggeliki Karavioti ◽  
...  
Keyword(s):  
Solar Cells ◽  
Visible Light ◽  
High Performance ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized Solar Cell ◽  
Absorbance Spectrum ◽  
Dye Sensitized ◽  
First Time ◽  
Sensitized Solar Cells ◽  
Second Peak

For the first time in dye-sensitized solar cell (DSSC) technology, a di-carbazole-based dye was synthesized and evaluated for its usage as a potential sensitizer for the development of wavelength selective semi-transparent DSSCs for greenhouses-oriented applications. The dye was designed to demonstrate a blue light absorption, allowing a high transmittance in the red region of the visible light, even after its adsorption on the anode semiconductor, which is the most important one for the photosynthetic action of the plants. The application of the new dye to DSSCs was examined using either a high-performance iodide-based electrolyte or a highly transparent iodine-free electrolyte to determine a good balance between electric power generation and device transparency. The spectral engineered DSSCs demonstrated quite promising characteristics, providing a high external quantum efficiency (higher than 70%) in the whole blue–green region of the visible light, while allowing high transparency (up to 55%) in the red region, where the second peak in the absorbance spectrum of chlorophyll is located. Finally, the derived results were discussed under the consideration of important metrics for this niche application, including the transparency of the solar cells in the region of photosynthetic active radiation and the attained crop growth factor. The present work constitutes one of the few comprehensive studies carried out up to now in the direction of the development of 3rd generation “agrivoltaics” for their possible integration as cladding materials in energy-autonomous greenhouses.

scholarly journals Highly efficient visible-light photocatalytic ethane oxidation into ethyl hydroperoxide as a radical reservoir

2021 ◽  
Vol 12 (16) ◽  
pp. 5825-5833
Author(s):  
Yao Zhu ◽  
Siyuan Fang ◽  
Shaoqin Chen ◽  
Youjie Tong ◽  
Chunling Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Oxidation ◽  
Ethane Oxidation ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
First Time ◽  
Visible Light Photocatalytic

Highly efficient visible-light driven photocatalytic oxidation of ethane into ethyl hydroperoxide was realized for the first time over Au/WO3.

scholarly journals High-Performance 3D Semiconductor-Based Heterostructure Photocatalyst in Sustained Control of Harmful Gas-Phase Pollutants Under Visible-Light Illumination

2021 ◽  
Author(s):  
Dong-Eun Lee ◽  
Mi Hyang Bae ◽  
Wan Jo
Keyword(s):  
Visible Light ◽  
Gas Phase ◽  
Charge Separation ◽  
High Performance ◽  
Three Dimensional ◽  
Reaction Chamber ◽  
Light Illumination ◽  
Highly Efficient ◽  
Visible Light Illumination ◽  
Catalyst Powder

Abstract Herein, a highly efficient three-dimensional (3D) semiconductor-based heterostructure photocatalyst (i.e., WO3–g-C3N4 monolithic architecture; WOCNM) was developed by immobilizing a WO3–g-C3N4 heterostructure powder on a melamine foam (MF) framework. Subsequently, the sustained control of two harmful model gas-phase pollutants (i.e., n-butanol and o-xylene) over WOCNM and selected monolithic counterparts (i.e., MF-supported WO3 monolith and MF-supported g-C3N4 monolith) was investigated under visible-light irradiation. WOCNM exhibited higher photocatalytic capabilities in the sustained control of the two model pollutants than those of individual WO3 and g-C3N4 monoliths because the WO3–g-C3N4 heterojunction enhanced its charge-separation ability. Notably, WOCNM exhibited highly efficient photocatalytic capabilities in the sustained control of n-butanol (up to 97%) and o-xylene (up to 86%). Moreover, no noticeable changes were observed in the WOCNM photocatalytic capability after the final run of successive applications. The fresh and successively used WOCNMs were nearly identical, and the photocatalyst powder was not observed in the reaction chamber after its successive application. As a result, WOCNM was a highly efficient and stable 3D heterostructure photocatalyst for the sustained control of gas-phase n-butanol and o-xylene, without significant catalyst powder loss. Promisingly, this study will expedite the future development of 3D photocatalysts for the sustained control of harmful gas-phase pollutants.

Efficient and High Colour Purity RGB OLEDs Employing Densely Packed Dimers

2021 ◽  
Author(s):  
Kai Wang ◽  
Xiao-Chun Fan ◽  
Youichi Tsuchiya ◽  
Yi-Zhong Shi ◽  
Masaki Tanaka ◽  
...  
Keyword(s):  
High Performance ◽  
Molecular Design ◽  
Spectral Band ◽  
Emission Spectra ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Highly Efficient ◽  
Fluorescence Efficiency ◽  
First Time ◽  
Narrow Emission

<p>Thermally activated delayed fluorescence (TADF) has been considered an important development in organic light-emitting diodes (OLEDs) for significantly enhancing efficiency of pure organic emitters. However, TADF is often associated with boarder emission spectra not meeting the requirements of modern high-performance flat-panel displays. A recent breakthrough in TADF emitters is the development of multiple resonance (MR) emitters which have a narrow spectral band width, i.e., good colour purities. However, so far molecular design for MR emitters is still much restricted and their emission peaks are covering only in a very limited range between ~ 460 to 510 nm. Herein, by exploiting a new emitting mechanism of densely packed dimer enhanced MR TADF, we demonstrate for the first time of highly efficient electroluminescence covering the RGB full colour with narrow spectral widths using pure organic emitters. MR-structured compounds with symmetry-forbidden n-π* transition for fluorescence are employed. They form intimate molecular interaction in their dimer states, leading to substantial changes in the S<sub>1</sub> electronic structure into π-π* transition and much smaller singlet-triplet energy offset, which can significantly enhance TADF characteristics. The fluorescence efficiency increases tremendously to approach unity upon dimer formation. More importantly, molecular relaxations are strongly restricted in the systems due to their robust MR typed monomer frameworks as well as their strong dimer interaction.<a> By applying these MR dimers in OLEDs, highly efficient narrow emission spectra can be achieved with full-width at half maximum of 32, 44, and 64 nm for blue, green, and red, respectively. Particularly, the green OLED realizes a remarkable maximum external quantum efficiency of 31%. Our strategies not only provide a pathway for realizing narrow emission covering full RGB emission range via intermolecular emitting systems (dimers, excimers, exciplexes, etc.</a>) for the first time, but also exploit a new emitting mechanism leading to state-of-the-art performance among all reported OLEDs.<b></b></p>

Efficient and High Colour Purity RGB OLEDs Employing Densely Packed Dimers

2021 ◽  
Author(s):  
Kai Wang ◽  
Xiao-Chun Fan ◽  
Youichi Tsuchiya ◽  
Yi-Zhong Shi ◽  
Masaki Tanaka ◽  
...  
Keyword(s):  
High Performance ◽  
Molecular Design ◽  
Spectral Band ◽  
Emission Spectra ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Highly Efficient ◽  
Fluorescence Efficiency ◽  
First Time ◽  
Narrow Emission

<p>Thermally activated delayed fluorescence (TADF) has been considered an important development in organic light-emitting diodes (OLEDs) for significantly enhancing efficiency of pure organic emitters. However, TADF is often associated with boarder emission spectra not meeting the requirements of modern high-performance flat-panel displays. A recent breakthrough in TADF emitters is the development of multiple resonance (MR) emitters which have a narrow spectral band width, i.e., good colour purities. However, so far molecular design for MR emitters is still much restricted and their emission peaks are covering only in a very limited range between ~ 460 to 510 nm. Herein, by exploiting a new emitting mechanism of densely packed dimer enhanced MR TADF, we demonstrate for the first time of highly efficient electroluminescence covering the RGB full colour with narrow spectral widths using pure organic emitters. MR-structured compounds with symmetry-forbidden n-π* transition for fluorescence are employed. They form intimate molecular interaction in their dimer states, leading to substantial changes in the S<sub>1</sub> electronic structure into π-π* transition and much smaller singlet-triplet energy offset, which can significantly enhance TADF characteristics. The fluorescence efficiency increases tremendously to approach unity upon dimer formation. More importantly, molecular relaxations are strongly restricted in the systems due to their robust MR typed monomer frameworks as well as their strong dimer interaction.<a> By applying these MR dimers in OLEDs, highly efficient narrow emission spectra can be achieved with full-width at half maximum of 32, 44, and 64 nm for blue, green, and red, respectively. Particularly, the green OLED realizes a remarkable maximum external quantum efficiency of 31%. Our strategies not only provide a pathway for realizing narrow emission covering full RGB emission range via intermolecular emitting systems (dimers, excimers, exciplexes, etc.</a>) for the first time, but also exploit a new emitting mechanism leading to state-of-the-art performance among all reported OLEDs.<b></b></p>

High-performance photodetectors based on two-dimensional tin(ii) sulfide (SnS) nanoflakes

2018 ◽  
Vol 6 (37) ◽  
pp. 10036-10041 ◽  
Author(s):  
Gangzha Liu ◽  
Yan Li ◽  
Bo Li ◽  
He Tian ◽  
Chao Fan ◽  
...  
Keyword(s):  
Response Time ◽  
Visible Light ◽  
High Performance ◽  
Fast Response ◽  
Two Dimensional ◽  
Fast Response Time ◽  
High Responsivity

A visible-light photodetector, based on two-dimensional SnS nanoflakes, exhibits an extremely high responsivity and detectivity with a fast response time.

Synthesis of porous and metallic CoB nanosheets towards a highly efficient electrocatalyst for rechargeable Na–O2 batteries

2018 ◽  
Vol 11 (10) ◽  
pp. 2833-2838 ◽  
Author(s):  
Jin-ling Ma ◽  
Na Li ◽  
Qi Zhang ◽  
Xin-bo Zhang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Performance ◽  
Composite Cathode ◽  
Highly Efficient ◽  
Carbon Nanotube Composite ◽  
First Time

A high-performance Na–O2 battery was achieved using a porous and metallic CoB nanosheet/carbon nanotube composite cathode, synthesised for the first time.

Highly efficient visible-light driven photocatalysts: a case of zinc stannate based nanocrystal assemblies

2014 ◽  
Vol 2 (12) ◽  
pp. 4157-4167 ◽  
Author(s):  
Caihong Liu ◽  
Robert Röder ◽  
Lichun Zhang ◽  
Zheng Ren ◽  
Haiyan Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Wide Band ◽  
Wide Band Gap ◽  
Zinc Stannate ◽  
Defect Energy ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Energy States

Highly efficient visible-light driven photocatalysts are enabled by wide band gap semiconducting zinc stannate based nanocrystal assemblies through populating the defect energy states and coherent hetero-interfaces.

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