Porous Tantalum Nitride Single Crystal at Two‐Centimeter Scale with Enhanced Photoelectrochemical Performance

Hematite is currently considered one of the most promising photoanode materials for light-driven water splitting. The photoelectrochemical performance of hematite is limited by its low conductivity. In this work, we demonstrate that the conductivity of hematite films can be tuned by controlling the orientation of hematite crystals. By applying a high magnetic field (up to 10 T) during the drop-casting preparation, hematite films composed of single crystal particles show featured texture by promoting those particles alignment with (001) normal to the substrate. By enhancing the photocurrent densities with tuned hematite orientation, the current method provides an effective way for increasing the number of carriers that can reach the surface.

Download Full-text

Tantalum and Tantalum Nitride as Diffusion Barriers Between Copper and Silicon

MRS Proceedings ◽

10.1557/proc-181-41 ◽

1990 ◽

Vol 181 ◽

Cited By ~ 12

Author(s):

Karen Holloway ◽

Peter Fryer

Keyword(s):

Single Crystal ◽

Cross Section ◽

Annealing Temperature ◽

Diffusion Barriers ◽

Rutherford Backscattering ◽

Tantalum Nitride ◽

Si Substrate ◽

Effective Barrier ◽

Cu Film

ABSTRACTWe have investigated the effectiveness of thin tantalum layers as diffusion barriers to copper. Fifty nm Ta films were sputtered onto unpatterned single crystal Si wafers and overlaid with 100 nm Cu. Material reactions in these films were followed as a function of annealing temperature by in-situ resistance measurements, and characterized by by Rutherford Backscattering and cross-section TEM. The effect of the incorporation of nitrogen was explored by reactively depositing Ta(5 at.% N) and Ta2N. Pure Ta prevents Cu - silicon interaction to at least 600 °C. At higher temperatures, reaction of the Si substrate with Ta forms a planar TaSi2 layer. Cu rapidly penetrates to the Si substrate, forming Cu silicide precipitates at the TaSi2 - Si interface. A study performed on the Si/Ta(N)/Cu film had very similar results. Ta2N is an even more effective barrier to copper penetration, preventing Cu reaction with the substrate for temperatures up to at least 700 °C.

Download Full-text

Single-crystal TiO2/SrTiO3 core–shell heterostructured nanowire arrays for enhanced photoelectrochemical performance

Rare Metals ◽

10.1007/s12598-019-01221-6 ◽

2019 ◽

Vol 38 (5) ◽

pp. 369-378 ◽

Cited By ~ 3

Author(s):

Ying Chen ◽

Shi Li ◽

Ruo-Yu Zhao ◽

Wei Li ◽

Zhao-Hui Ren ◽

...

Keyword(s):

Single Crystal ◽

Nanowire Arrays ◽

Core Shell ◽

Photoelectrochemical Performance

Download Full-text

Nano-surface Monocrystalline BiVO4 Nanoplate Photoanode for Enhanced Photoelectrochemical Performance

New Journal of Chemistry ◽

10.1039/d1nj00658d ◽

2021 ◽

Author(s):

Bin Gao ◽

Tao Wang ◽

Hairong Xue ◽

Cheng Jiang ◽

Lei Sheng ◽

...

Keyword(s):

Single Crystal ◽

Low Cost ◽

Photocurrent Density ◽

Etching Process ◽

Photoelectrochemical Performance ◽

Surface Nanostructure

The single-crystal BiVO4 photoanode with surface nanostructure is prepared by a low-cost and simple etching process. As a result, the modified photoanode shows a higher photocurrent density and a lower...

Download Full-text

Hollow hematite single crystals deposited with ultra-thin Al2O3 by atom layer deposition for improved photoelectrochemical performance

Dalton Transactions ◽

10.1039/c7dt00504k ◽

2017 ◽

Vol 46 (32) ◽

pp. 10635-10640 ◽

Cited By ~ 6

Author(s):

Wei Jiao ◽

Jingrui Wu ◽

Siwen Cui ◽

Ning Wei ◽

Zia Ur Rahman ◽

...

Keyword(s):

Single Crystal ◽

Single Crystals ◽

Hydrothermal Method ◽

Photoelectrochemical Performance ◽

Layer Deposition ◽

Atom Layer

Hollow and single crystal α-Fe2O3 was prepared by a hydrothermal method, which showed enhanced PEC performance on coating with ultra-thin Al2O3.

Download Full-text

Centimeter-Scale Porous Ta3N5 Single Crystal Monolith Enhances Photoelectrochemical Performance

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.1c01558 ◽

2021 ◽

Vol 125 (15) ◽

pp. 8098-8104

Author(s):

Wenting Li ◽

Fangyuan Cheng ◽

Lu Jin ◽

Qingping Wu ◽

Kui Xie

Keyword(s):

Single Crystal ◽

Photoelectrochemical Performance

Download Full-text

Surface passivated halide perovskite single-crystal for efficient photoelectrochemical synthesis of dimethoxydihydrofuran

Nature Communications ◽

10.1038/s41467-021-21487-8 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Xu-Dong Wang ◽

Yu-Hua Huang ◽

Jin-Feng Liao ◽

Ze-Feng Wei ◽

Wen-Guang Li ◽

...

Keyword(s):

Thin Film ◽

Single Crystal ◽

Surface Defects ◽

Fold Increase ◽

Catalytic Layer ◽

Protective Film ◽

Photoelectrochemical Performance ◽

Lead Bromide ◽

Transport Behaviour ◽

Halide Perovskite

AbstractHalide perovskite single-crystals have recently been widely highlighted to possess high light harvesting capability and superior charge transport behaviour, which further enable their attractive performance in photovoltaics. However, their application in photoelectrochemical cells has not yet been reported. Here, a methylammonium lead bromide MAPbBr3 single-crystal thin film is reported as a photoanode with potential application in photoelectrochemical organic synthesis, 2,5-dimethoxy-2,5-dihydrofuran. Depositing an ultrathin Al2O3 layer is found to effectively passivate perovskite surface defects. Thus, the nearly 5-fold increase in photoelectrochemical performance with the saturated current being increased from 1.2 to 5.5 mA cm−2 is mainly attributed to suppressed trap-assisted recombination for MAPbBr3 single-crystal thin film/Al2O3. In addition, Ti3+-species-rich titanium deposition has been introduced not only as a protective film but also as a catalytic layer to further advance performance and stability. As an encouraging result, the photoelectrochemical performance and stability of MAPbBr3 single-crystal thin film/Al2O3/Ti-based photoanode have been significantly improved for 6 h continuous dimethoxydihydrofuran evolution test with a high Faraday efficiency of 93%.

Download Full-text