Ultrafast Charge Carrier Delocalization in CdSe/CdS Quasi-Type II and CdS/CdSe Inverted Type I Core–Shell: A Structural Analysis through Carrier-Quenching Study

2015 ◽  
Vol 119 (46) ◽  
pp. 26202-26211 ◽  
Author(s):  
Partha Maity ◽  
Tushar Debnath ◽  
Hirendra N. Ghosh
Keyword(s):  
Structural Analysis ◽  
Charge Carrier ◽  
Core Shell ◽  
Type I ◽  
Type Ii

Lead-Free Metal Halide Perovskite Nanocrystals for Photocatalysis in Water

2019 ◽  
Author(s):  
Subhajit Bhattacharjee ◽  
Sonu Pratap Chaudhary ◽  
Sayan Bhattacharyya
Keyword(s):  
Charge Carrier ◽  
Wide Spectrum ◽  
Real Life ◽  
Metal Halide ◽  
Lead Free ◽  
Water Medium ◽  
Type I ◽  
Type Ii ◽  
Perovskite Layer ◽  
Halide Perovskites

<p>Metal halide perovskites with high absorption coefficient, direct generation of free charge carriers, excellent ambipolar charge carrier transport properties, point-defect tolerance, compositional versatility and solution processability are potentially transforming the photovoltaics and optoelectronics industries. However their limited ambient stability, particularly those of iodide perovskites, obscures their use as photocatalysts especially in aqueous medium. In an unprecedented approach we have exploited the photo-absorption property of the less toxic lead-free Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9 </sub>(X = Br, I) nanocrystals (NCs) to catalyse the degradation of water pollutant organic dye, methylene blue (MB) in presence of visible light at room temperature. After providing a proof-of-concept with bromide perovskites in isopropanol, the perovskites are employed as photocatalysts in water medium by designing perovskite/Ag<sub>2</sub>S and perovskite/TiO<sub>2 </sub>composite systems, with Type I (or quasi Type II) and Type II alignments, respectively. Ag<sub>2</sub>S and TiO<sub>2</sub> coatings decelerate penetration of water into the perovskite layer while facilitating charge carrier extraction. With a minimal NC loading, Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/Ag<sub>2</sub>S degrades ~90% MB within an hour. Our approach has the potential to unravel the photocatalytic properties of metal halide perovskites for a wide spectrum of real-life applications. </p>

Interfacial strain effect on type-I and type-II core/shell quantum dots

2016 ◽  
Vol 97 ◽  
pp. 489-494 ◽  
Author(s):  
Negar Gheshlaghi ◽  
Hadi Sedaghat Pisheh ◽  
M. Rezaul Karim ◽  
Derya Malkoc ◽  
Hilmi Ünlü
Keyword(s):  
Quantum Dots ◽  
Strain Effect ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Interfacial Strain

A study on the transfer of photo-excited charge carriers within direct and inverted type-I heterojunctions of CdS and ZnS QDs

2018 ◽  
Vol 42 (12) ◽  
pp. 9808-9818 ◽  
Author(s):  
Abdolraouf Samadi-Maybodi ◽  
Mohammad Reza Shariati
Keyword(s):  
Wave Function ◽  
Charge Carrier ◽  
Charge Carriers ◽  
P Wave ◽  
Core Shell ◽  
Type I ◽  
Solar Photocatalysis ◽  
Fast Charge ◽  
Carrier Separation

Wave function engineering for fast charge carrier separation/slow recombination in reverse type-I core/shell QDs for solar photocatalysis.

scholarly journals Type-tuning of quasi-type-II CdSe/CdS seeded core/shell nanorods: type-I vs. type-II

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
Ahmet Fatih Cihan ◽  
Yusuf Kelestemur ◽  
Burak Guzelturk ◽  
Hilmi Volkan Demir
Keyword(s):  
Core Shell ◽  
Type I ◽  
Type Ii

scholarly journals Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

2020 ◽  
Vol 2 (1) ◽  
pp. 274-285 ◽  
Author(s):  
Qun Wang ◽  
Sicao Yu ◽  
Wei Qin ◽  
Xiaohong Wu
Keyword(s):  
Charge Transfer ◽  
Charge Carrier ◽  
Molecular Oxygen ◽  
Oxygen Activation ◽  
Carrier Dynamics ◽  
Core Shell ◽  
Type I ◽  
Charge Carrier Dynamics ◽  
Composite Photocatalysts ◽  
Interfacial Charge

Isopropanol-assisted synthesis MAPbBr3 wrapped/entrapped p-g-C3N4 intergrowth microcrystals have inverted type-I core/shell band configuration which leads to enhanced interfacial charge transfer and molecular oxygen activation.

Shell-Thickness-Dependent Biexciton Lifetime in Type I and Quasi-Type II CdSe@CdS Core/Shell Quantum Dots

2018 ◽  
Vol 122 (25) ◽  
pp. 14091-14098 ◽  
Author(s):  
Degui Kong ◽  
Yanyan Jia ◽  
Yueping Ren ◽  
Zhaoxiong Xie ◽  
Kaifeng Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Thickness ◽  
Core Shell ◽  
Type I ◽  
Type Ii

Lead-Free Metal Halide Perovskite Nanocrystals for Photocatalysis in Water

2019 ◽  
Author(s):  
Subhajit Bhattacharjee ◽  
Sonu Pratap Chaudhary ◽  
Sayan Bhattacharyya
Keyword(s):  
Charge Carrier ◽  
Wide Spectrum ◽  
Real Life ◽  
Metal Halide ◽  
Lead Free ◽  
Water Medium ◽  
Type I ◽  
Type Ii ◽  
Perovskite Layer ◽  
Halide Perovskites

<p>Metal halide perovskites with high absorption coefficient, direct generation of free charge carriers, excellent ambipolar charge carrier transport properties, point-defect tolerance, compositional versatility and solution processability are potentially transforming the photovoltaics and optoelectronics industries. However their limited ambient stability, particularly those of iodide perovskites, obscures their use as photocatalysts especially in aqueous medium. In an unprecedented approach we have exploited the photo-absorption property of the less toxic lead-free Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9 </sub>(X = Br, I) nanocrystals (NCs) to catalyse the degradation of water pollutant organic dye, methylene blue (MB) in presence of visible light at room temperature. After providing a proof-of-concept with bromide perovskites in isopropanol, the perovskites are employed as photocatalysts in water medium by designing perovskite/Ag<sub>2</sub>S and perovskite/TiO<sub>2 </sub>composite systems, with Type I (or quasi Type II) and Type II alignments, respectively. Ag<sub>2</sub>S and TiO<sub>2</sub> coatings decelerate penetration of water into the perovskite layer while facilitating charge carrier extraction. With a minimal NC loading, Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/Ag<sub>2</sub>S degrades ~90% MB within an hour. Our approach has the potential to unravel the photocatalytic properties of metal halide perovskites for a wide spectrum of real-life applications. </p>

Sign in / Sign up

Export Citation Format

Share Document