Oxygen Deficient TiO2 Photoanode for Photoelectrochemical Water Oxidation

2016 ◽  
Vol 253 ◽  
pp. 11-40 ◽  
Author(s):  
Yi Yang ◽  
Ying Chih Pu ◽  
Yat Li ◽  
Jin Zhang
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Water Oxidation ◽  
Chemical Reduction ◽  
Hydrogen Treatment ◽  
Trap States ◽  
Ultrafast Laser Spectroscopy ◽  
Charge Carrier Dynamics ◽  
Carrier Recombination ◽  
Charge Carrier Recombination

Titanium dioxide (TiO2) has been widely used as photoanodes in photoelectrochemical (PEC) water splitting. However, the typically high density of bandgap trap states results in fast charge carrier recombination and poor electrical conductivity, and thereby weak PEC performance. Rational creation of oxygen vacancy (Vo) in TiO2 has been demonstrated as an effective method to modify the electronic and optical properties, as well as improved PEC performance. Different strategies have been developed to fabricate oxygen deficient TiO2 photoanodes, such as hydrogen treatment, thermal annealing, electrochemical reduction, flame reduction, and chemical reduction. In conjunction with oxygen vacancy creation, doping of TiO2 with elements further enhances the PEC activity by introducing other bandgap states. Various techniques, including ultrafast laser spectroscopy, have been employed to probe the chemical nature and associated charge carrier dynamics of the bandgap states.

Efficient Defect Passivation with Niacin for High-Performance and Stable Perovskite Solar Cells

2021 ◽  
Author(s):  
Jing Ren ◽  
Shurong Wang ◽  
Jianxing Xia ◽  
Chengbo Li ◽  
Lisha Xie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Trap States ◽  
Carrier Recombination ◽  
Defect Passivation ◽  
Recombination Centers ◽  
Charge Carrier Recombination ◽  
Halide Perovskite

Defects, inevitably produced in the solution-processed halide perovskite films, can act as charge carrier recombination centers to induce severe energy loss in perovskite solar cells (PSCs). Suppressing these trap states...

scholarly journals Are Shockley-Read-Hall and ABC models valid for lead halide perovskites?

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Alexander Kiligaridis ◽  
Pavel A. Frantsuzov ◽  
Aymen Yangui ◽  
Sudipta Seth ◽  
Jun Li ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Auger Recombination ◽  
Mapping Technique ◽  
Decay Kinetics ◽  
Advanced Technique ◽  
Charge Carrier Dynamics ◽  
Carrier Recombination ◽  
Halide Perovskites ◽  
Charge Carrier Recombination ◽  
Lead Halide

AbstractMetal halide perovskites are an important class of emerging semiconductors. Their charge carrier dynamics is poorly understood due to limited knowledge of defect physics and charge carrier recombination mechanisms. Nevertheless, classical ABC and Shockley-Read-Hall (SRH) models are ubiquitously applied to perovskites without considering their validity. Herein, an advanced technique mapping photoluminescence quantum yield (PLQY) as a function of both the excitation pulse energy and repetition frequency is developed and employed to examine the validity of these models. While ABC and SRH fail to explain the charge dynamics in a broad range of conditions, the addition of Auger recombination and trapping to the SRH model enables a quantitative fitting of PLQY maps and low-power PL decay kinetics, and extracting trap concentrations and efficacies. However, PL kinetics at high power are too fast and cannot be explained. The proposed PLQY mapping technique is ideal for a comprehensive testing of theories and applicable to any semiconductor.

scholarly journals Ir-phosphate cocatalyst for photoelectrochemical water oxidation using α-Fe2O3

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21430-21438 ◽  
Author(s):  
Ahamed Irshad ◽  
Nookala Munichandraiah
Keyword(s):  
Charge Carrier ◽  
Water Oxidation ◽  
Oxidation Reaction ◽  
Carrier Recombination ◽  
Redox Shuttle ◽  
Charge Carrier Recombination ◽  
Photoelectrochemical Water Oxidation

Ir-phosphate (Ir-Pi) cocatalyst on the surface of Fe2O3 acts as a redox shuttle and thus, reduces charge carrier recombination during PEC water oxidation reaction.

Ultrafast Charge Carrier Dynamics and Photoelectrochemical Properties of Hydrogen-treated TiO2 Nanowire Arrays

2012 ◽  
Vol 1387 ◽  
Author(s):  
Damon A. Wheeler ◽  
Gongming Wang ◽  
Bob C. Fitzmorris ◽  
Staci A. Adams ◽  
Yat Li ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Carrier Dynamics ◽  
Nanowire Arrays ◽  
Transient Absorption Spectroscopy ◽  
Hydrogen Treatment ◽  
Photoelectrochemical Properties ◽  
Relaxation Dynamics ◽  
Fast Decay ◽  
Charge Carrier Dynamics

ABSTRACTHere we report studies of photoelectrochemical (PEC) properties and ultrafast charge carrier relaxation dynamics of hydrogen-treated TiO2 (H:TiO2) nanowire arrays. PEC measurements showed the photocurrent density of the H:TiO2 was approximately double that of TiO2, attributed to increased donor density due to the formation of oxygen vacancies in H:TiO2 due to hydrogen treatment Charge carrier dynamics of H:TiO2, measured using fs transient absorption spectroscopy, showed a fast decay of ∼20 ps followed by slower decay persisting to tens of picoseconds. The fast decay is attributed to bandedge electron-hole recombination and the slower decay is attributed to recombination from trap states. Visible absorption is attributed to either electronic transitions from the valence band to oxygen vacancy states or from oxygen vacancy states to the conduction band of the TiO2, which is supported by incident photon to current conversion efficiency (IPCE) data. H:TiO2 represents a unique material with improved photoelectrochemical properties for applications including PEC water splitting, solar cells, and photocatalysis.

Charge Carrier Dynamics in Nanostructured Tungsten Trioxide for Solar Driven Water Oxidation

2018 ◽  
Author(s):  
Sacha Corby ◽  
Laia Francas ◽  
Shababa Selim ◽  
Michael Sachs ◽  
Andreas Kafizas ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Oxidation ◽  
Tungsten Trioxide ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics

scholarly journals WO3/BiVO4: impact of charge separation at the timescale of water oxidation

2019 ◽  
Vol 10 (9) ◽  
pp. 2643-2652 ◽  
Author(s):  
Shababa Selim ◽  
Laia Francàs ◽  
Miguel García-Tecedor ◽  
Sacha Corby ◽  
Chris Blackman ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Oxidation ◽  
Charge Separation ◽  
Carrier Dynamics ◽  
Applied Bias ◽  
Charge Carrier Dynamics

Unveiling the role of applied bias on the charge carrier dynamics in the WO3/BiVO4 junction during water oxidation.

Time-dependent Langevin-type bimolecular charge carrier recombination in regiorandom poly(3-hexylthiophene)

2005 ◽  
Vol 155 (2) ◽  
pp. 242-245 ◽  
Author(s):  
A. Pivrikas ◽  
R. Österbacka ◽  
G. Juška ◽  
K. Arlauskas ◽  
H. Stubb
Keyword(s):  
Charge Carrier ◽  
Time Dependent ◽  
Carrier Recombination ◽  
Charge Carrier Recombination

Bi-doped Graphitic Carbon Nitride Nanotubes Boosts the Degradation Photocatalysis of Rhodamine B

2022 ◽  
Author(s):  
Qingqing Gao ◽  
Qian Lei ◽  
Ruoyan Miao ◽  
Manyi Gao ◽  
Fang Song ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Rhodamine B ◽  
High Stability ◽  
Carbon Nitride ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Efficiency ◽  
Metal Free ◽  
Carrier Recombination ◽  
Charge Carrier Recombination ◽  
Polymeric Carbon

Polymeric carbon nitride (PCN) is an emerging metal-free photocatalysts with high stability but is plagued by low photocatalytic efficiency due to the rapid charge carrier recombination behavior. Herein, Bi doped...

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