Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band Alignment

2020 ◽  
Vol 11 (16) ◽  
pp. 6757-6762
Author(s):  
Johnpaul K. Pious ◽  
Manasa G. Basavarajappa ◽  
Chinnadurai Muthu ◽  
Nayana Krishna ◽  
Ryosuke Nishikubo ◽  
...  
Keyword(s):  
Band Alignment ◽  
Charge Carriers ◽  
One Dimensional

scholarly journals Synthesis of Porous ZnO Nanosheets and Carbon Nanotube Hybrids as Efficient Photocatalysts via Pulsed Laser Ablation

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 787 ◽  
Author(s):  
Yun Yeol Ryu ◽  
Taekyung Kim ◽  
HyukSu Han
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Charge Carriers ◽  
Two Dimensional ◽  
One Dimensional ◽  
Promising Strategy ◽  
Zno Nanosheets ◽  
Short Time ◽  
Laser Ablation Technique

Zinc oxide (ZnO) has attractive photocatalytic properties. However, the high recombination rate of the photo-excited charge carriers on this material often restricts application. Here, we report that hybridization of one dimensional (1D) carbon nanotubes (CNT) on two dimensional (2D) porous ZnO nanosheets (NS) can be a promising strategy to overcome some of the challenges of ZnO. Specifically, a pulsed laser ablation technique was utilized to hybridize 1D CNT with 2D porous ZnO NS in environmentally friendly as well as super-economic (short time, less than 10 min) conditions. The synthesized ZnO NS-CNT hybrids show a significantly enhanced photocatalytic activity for water splitting relative to their counterpart ZnO NS.

Synergistic doping effects of a ZnO:N/BiVO4:Mo bunched nanorod array photoanode for enhancing charge transfer and carrier density in photoelectrochemical systems

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20256-20265 ◽  
Author(s):  
Donghyung Kim ◽  
Zhuo Zhang ◽  
Kijung Yong
Keyword(s):  
Charge Transfer ◽  
Carrier Density ◽  
Nanorod Array ◽  
Charge Carriers ◽  
One Dimensional ◽  
Doping Effects

One-dimensional heterojunction nanorods are highly attractive as photoanodes for developing efficient photoelectrochemical (PEC) systems for the effective photogeneration of charge carriers and transport.

scholarly journals Interface Structure and Band Alignment of CZTS/CdS Heterojunction: An Experimental and First-Principles DFT Investigation

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4040 ◽  
Author(s):  
Sachin Rondiya ◽  
Yogesh Jadhav ◽  
Mamta Nasane ◽  
Sandesh Jadkar ◽  
Nelson Y. Dzade
Keyword(s):  
Dft Calculations ◽  
First Principles ◽  
Density Functional ◽  
Rf Sputtering ◽  
Band Alignment ◽  
Charge Carriers ◽  
Band Offsets ◽  
Conduction Band Offset ◽  
Cv Measurements ◽  
Czts Thin Films

We report a phase-pure kesterite Cu2ZnSnS4 (CZTS) thin films, synthesized using radio frequency (RF) sputtering followed by low-temperature H2S annealing and confirmed by XRD, Raman spectroscopy and XPS measurements. Subsequently, the band offsets at the interface of the CZTS/CdS heterojunction were systematically investigated by combining experiments and first-principles density functional theory (DFT) calculations, which provide atomic-level insights into the nature of atomic ordering and stability of the CZTS/CdS interface. A staggered type II band alignment between the valence and conduction bands at the CZTS/CdS interface was determined from Cyclic Voltammetry (CV) measurements and the DFT calculations. The conduction and valence band offsets were estimated at 0.10 and 1.21 eV, respectively, from CV measurements and 0.28 and 1.15 from DFT prediction. Based on the small conduction band offset and the predicted higher positions of the VBmax and CBmin for CZTS than CdS, it is suggested photogenerated charge carriers will be efficient separated across the interface, where electrons will flow from CZTS to the CdS and and vice versa for photo-generated valence holes. Our results help to explain the separation of photo-excited charge carriers across the CZTS/CdS interface and it should open new avenues for developing more efficient CZTS-based solar cells.

Robust staggered band alignment in one-dimensional van der Waals heterostructures: binary compound nanoribbons in nanotubes

2019 ◽  
Vol 7 (13) ◽  
pp. 3829-3836 ◽  
Author(s):  
Ming Gong ◽  
Guang-Ping Zhang ◽  
Hui Hui Hu ◽  
Liangzhi Kou ◽  
Kun Peng Dou ◽  
...  
Keyword(s):  
Water Splitting ◽  
Light Harvesting ◽  
Van Der Waals ◽  
Binary Compound ◽  
Band Alignment ◽  
Van Der Waals Heterostructures ◽  
One Dimensional

The robust staggered band alignment in one-dimensional van der Waals heterostructures is favorable for enhancing light harvesting and water splitting.

scholarly journals Charge-transfer biexciton annihilation in a donor–acceptor co-crystal yields high-energy long-lived charge carriers

2020 ◽  
Vol 11 (35) ◽  
pp. 9532-9541
Author(s):  
Itai Schlesinger ◽  
Natalia E. Powers-Riggs ◽  
Jenna L. Logsdon ◽  
Yue Qi ◽  
Stephen A. Miller ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
High Energy ◽  
Charge Carriers ◽  
One Dimensional ◽  
Femtosecond Transient Absorption ◽  
Donor Acceptor ◽  
Charge Transfer Excitons

Femtosecond transient absorption microscopy of donor–acceptor single co-crystals shows that photogenerated charge transfer excitons in one-dimensional donor–acceptor π stacks annihilate to produce high-energy, long-lived electrons and holes.

Theoretical analysis of band alignment and charge carriers migration in mixed-phase TiO2 systems

2018 ◽  
Vol 17 (4) ◽  
pp. 1505-1514 ◽  
Author(s):  
Cecilia I. N. Morgade ◽  
Norberto J. Castellani ◽  
Gabriela F. Cabeza
Keyword(s):  
Theoretical Analysis ◽  
Band Alignment ◽  
Mixed Phase ◽  
Charge Carriers
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