Stability of quantum efficiency and visible light rejection of alkali halide photocathodes

2000 ◽  
Author(s):  
Anton S. Tremsin ◽  
Oswald H. W. Siegmund
Keyword(s):  
Visible Light ◽  
Quantum Efficiency ◽  
Alkali Halide

Directed holey and ordered g-C3N4.5 nanosheets by a hard template nanocasting approach for sustainable visible-light hydrogen evolution with prominent quantum efficiency

2020 ◽  
Vol 8 (26) ◽  
pp. 13328-13339 ◽  
Author(s):  
Bindu Antil ◽  
Ravi Ranjan ◽  
Chinnakonda S. Gopinath ◽  
Sasanka Deka
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Quantum Efficiency ◽  
Mesoporous Carbon ◽  
Carbon Nitride ◽  
Hard Template ◽  
Excess Nitrogen ◽  
Carbon Nitride Nanosheets ◽  
Mesoporous Carbon Nitride

Ordered honeycomb-like mesoporous carbon nitride nanosheets with excess nitrogen (g-C3N4.5) were developed, which afford exclusive photocatalytic H2 evolution from water.

Boosting photocatalytic H2 evolution on g-C3N4 by modifying covalent organic frameworks (COFs)

2019 ◽  
Vol 55 (41) ◽  
pp. 5829-5832 ◽  
Author(s):  
Maolan Luo ◽  
Qing Yang ◽  
Kewei Liu ◽  
Hongmei Cao ◽  
Hongjian Yan
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Quantum Efficiency ◽  
Covalent Organic Frameworks ◽  
H2 Evolution ◽  
Co Catalyst ◽  
Visible Light Driven ◽  
Apparent Quantum Efficiency ◽  
Sacrificial Agent ◽  
Photocatalytic H2 Evolution

Modifying g-C3N4 with covalent organic frameworks (COFs) through imine linkage results in a dramatically enhanced visible-light-driven photocatalytic hydrogen evolution, which reached 10.1 mmol g−1 h−1 when 2 wt% Pt and triethanolamine were used as co-catalyst and sacrificial agent, respectively, corresponding to an apparent quantum efficiency (AQE) of 20.7% at 425 nm.

Preparation, Characterization and Visible-Light Photocatalytic Properties of BiOCl/BiOI Nanocomposites

2012 ◽  
Vol 586 ◽  
pp. 10-17 ◽  
Author(s):  
Kai Jin Huang ◽  
Hou Guang Liu ◽  
Fang Li Yuan ◽  
Chang Sheng Xie
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Quantum Efficiency ◽  
Specific Surface Area ◽  
Light Absorption ◽  
Critical Factor ◽  
Photocatalytic Properties ◽  
Impregnation Method ◽  
Visible Light Photocatalytic

BiOCl/BiOI nanocomposites were synthesized using a thermal impregnation method for the first time. The intense visible-light absorption and large specific surface area gave 4wt.％BiOCl/BiOI nanocomposites the best visible-light photocatalytic properties among all the catalysts for the photodegradation of methyl orange,about 78％ after 2 h. But decreased activities were obtained with the increase of BiOCl content in the nanocomposites. Considering the light absorption,specific surface area and the quantum efficiency, the high recombination of the photoinduced electron-hole pairs of the catalysts that lowed the quantum efficiency was believed to be the critical factor for their decreased photocatalytic activities.

A High Performance UV Photodetector from Thin Film Diamond

1995 ◽  
Vol 416 ◽  
Author(s):  
Robert D. Mckeag ◽  
Michael D. Whitfield ◽  
Simon Sm Chan ◽  
Lisa Ys Pang ◽  
Richard B. Jackman
Keyword(s):  
Thin Film ◽  
Visible Light ◽  
Quantum Efficiency ◽  
Dark Current ◽  
External Quantum Efficiency ◽  
High Performance ◽  
Uv Light ◽  
High Sensitivity ◽  
Uv Photodetector ◽  
Deep Uv

ABSTRACTThin film diamond has been used to fabricate a photodetector which displays high sensitivity to deep UV light, with an external quantum efficiency of greater than one, a dark current of less than 0.1nA and which is near ‘blind’ to visible light.

Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H2 production

2015 ◽  
Vol 8 (12) ◽  
pp. 3708-3717 ◽  
Author(s):  
Jingrun Ran ◽  
Tian Yi Ma ◽  
Guoping Gao ◽  
Xi-Wen Du ◽  
Shi Zhang Qiao
Keyword(s):  
Visible Light ◽  
Quantum Efficiency ◽  
Carbon Nitride ◽  
H2 Production ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Production Activity ◽  
Carbon Nitride Nanosheets ◽  
Visible Light Photocatalytic

Porous P-doped g-C3N4 nanosheets prepared by combining P doping and thermal exfoliation exhibit a high visible-light photocatalytic H2-production activity of 1596 μmol h−1 g−1 and a quantum efficiency of 3.56% at 420 nm.

Enhanced photocatalytic activity of BiVO4 coupled with iron-based complexes for water oxidation under visible light irradiation

2019 ◽  
Vol 55 (17) ◽  
pp. 2529-2532 ◽  
Author(s):  
Xiangming Liang ◽  
Junqi Lin ◽  
Xiaohu Cao ◽  
Wanjun Sun ◽  
Junyi Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Quantum Efficiency ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
High Oxygen ◽  
Light Irradiation ◽  
Apparent Quantum Efficiency ◽  
Iron Based ◽  
Oxygen Yield

Four iron complexes were used as pre-catalysts in BiVO4–NaIO3 photocatalytic water oxidation systems. The best-performing system afforded a rather high oxygen yield and apparent quantum efficiency yield of 99.1% and 44.3%, respectively.

Polarization engineered InGaN/GaN Visible-light photodiodes featuring high responsivity, bandpass response, and high speed

2021 ◽  
Author(s):  
Zesheng Lv ◽  
Yao Guo ◽  
Supeng Zhang ◽  
Quan Wen ◽  
Hao Jiang
Keyword(s):  
Visible Light ◽  
Quantum Efficiency ◽  
High Speed ◽  
Optoelectronic Devices ◽  
Quantum Structure ◽  
High Responsivity ◽  
P Type ◽  
Free Polarization

Optoelectronic devices, especially III-nitride quantum-structure devices, are suffering from a serise of material problems, such as polarization induced quantum efficiency drooping and lack of suitable p-type dopant. Herein, dopant-free polarization-induced...

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