scholarly journals Defect-Induced Band-Edge Reconstruction of a Bismuth-Halide Double Perovskite for Visible-Light Absorption

2017 ◽  
Vol 139 (14) ◽  
pp. 5015-5018 ◽  
Author(s):  
Adam H. Slavney ◽  
Linn Leppert ◽  
Davide Bartesaghi ◽  
Aryeh Gold-Parker ◽  
Michael F. Toney ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Double Perovskite ◽  
Band Edge ◽  
Visible Light Absorption ◽  
Edge Reconstruction

Rigid Amine‐Induced Pseudo‐3 D Lead‐Free Bismuth Halide Perovskite with an Improved Band Edge for Visible‐Light Absorption

ChemSusChem ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2753-2760
Author(s):  
Yanyan Wang ◽  
Rui Wen ◽  
Yuanyuan Liu ◽  
Le‐Yu Bi ◽  
Mingming Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Lead Free ◽  
Band Edge ◽  
Visible Light Absorption ◽  
Halide Perovskite

Self-Assembled Organic Cations-Assisted Band-Edge Tailoring in Bismuth-Based Perovskites for Enhanced Visible Light Absorption and Photoconductivity

2021 ◽  
pp. 5758-5764
Author(s):  
Johnpaul K. Pious ◽  
Manasa G. Basavarajappa ◽  
Chinnadurai Muthu ◽  
Ryosuke Nishikubo ◽  
Akinori Saeki ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Band Edge ◽  
Organic Cations ◽  
Visible Light Absorption ◽  
Self Assembled

scholarly journals Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6

2019 ◽  
Vol 55 (26) ◽  
pp. 3721-3724 ◽  
Author(s):  
Fengxia Wei ◽  
Zeyu Deng ◽  
Shijing Sun ◽  
Noor Titan Putri Hartono ◽  
Hwee Leng Seng ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Double Perovskite ◽  
Lead Free ◽  
Visible Light Absorption

Lead-free double perovskite Cs2AgSbBr6 is synthesized to show a low indirect bandgap of 1.64 eV.

Impact of Rutile Fraction on TiO2 Visible-Light Absorption and Visible-Light-Induced Photocatalytic Activity

2018 ◽  
Author(s):  
David Maria Tobaldi ◽  
Luc Lajaunie ◽  
ana caetano ◽  
nejc rozman ◽  
Maria Paula Seabra ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Solid Phase ◽  
Diffraction Method ◽  
Band Alignment ◽  
Quantitative Phase Analysis ◽  
Transmission Microscopy ◽  
Visible Light Absorption ◽  
X Ray

<div>Titanium dioxide is by far the most utilised semiconductor material for photocatalytic applications. Still, it is transparent to visible-light. Recently, it has been proved that a type-II band alignment for the rutile−anatase mixture would improve its visible-light absorption.</div><div>In this research paper we thoroughly characterised the real crystalline and amorphous phases of synthesised titanias – thermally treated at different temperatures to get distinct ratios of anatase-rutile-amorphous fraction – as well as that of three commercially available photocatalytic nano-TiO2. </div><div>The structural characterisation was done via advanced X-ray diffraction method, namely the Rietveld-RIR method, to attain a full quantitative phase analysis of the specimens. The microstructure was also investigated via an advanced X-ray method, the whole powder pattern modelling. These methods were validated combining advanced aberration-corrected scanning transmission microscopy and high-resolution electron energy-loss spectroscopy. The photocatalytic activity was assessed in the liquid- and gas-solid phase (employing rhodamine B and 4-chlorophenol, and isopropanol, respectively, as the organic substances to degrade) using a light source irradiating exclusively in the visible-range.</div><div>Optical spectroscopy showed that even a small fraction of rutile (2 wt%) is able to shift to lower energies the apparent optical band gap of an anatase-rutile mixed phase. But is this enough to attain a real photocatalytic activity promoted by merely visible-light?</div><div>We tried to give a reply to that question.</div><div>Photocatalytic activity results in the liquid-solid phase showed that a high surface hydroxylation led to specimen with superior visible light-induced catalytic activity (i.e. dye and ligand-to-metal charge transfer complexes sensitisation effects). That is: not photocatalysis <i>sensu-strictu</i>.</div><div>On the other hand, the gas-solid phase results showed that a higher amount of the rutile fraction (around 10 wt%), together with less recombination of the charge carriers, were more effective for an actual photocatalytic oxidation of isopropanol.</div>

Double Doping of NaTaO3 Photocatalysts with Lanthanum and Manganese for Strongly Enhanced Visible-Light Absorption

2019 ◽  
Vol 2 (10) ◽  
pp. 7518-7526 ◽  
Author(s):  
Hanggara Sudrajat ◽  
Mitsunori Kitta ◽  
Nobuyuki Ichikuni ◽  
Hiroshi Onishi
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Double Doping

Carrier Engineering of Zr-mediated Ta3N5 Film as Efficient Photoanode for Solar Water Splitting

2021 ◽  
Author(s):  
Xin Zou ◽  
Xueyang Han ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
Chun Du ◽  
...  
Keyword(s):  
Band Structure ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Photoelectrochemical Water Splitting ◽  
Promising Candidate ◽  
Visible Light Absorption ◽  
Solar Water ◽  
Solar Water Splitting

Ta3N5 is regarded as a promising candidate material with adequate visible light absorption and band structure for photoelectrochemical water splitting. However, the performance of Ta3N5 is severely limited by the...

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