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.

scholarly journals Ultrafast photoinduced dynamics of the organolead trihalide perovskite CH3NH3PbI3 on mesoporous TiO2 scaffolds in the 320–920 nm range

2015 ◽  
Vol 17 (29) ◽  
pp. 19238-19246 ◽  
Author(s):  
Oliver Flender ◽  
Johannes R. Klein ◽  
Thomas Lenzer ◽  
Kawon Oum
Keyword(s):  
Charge Carrier ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Mesoporous Tio2 ◽  
Transient Absorption Spectroscopy ◽  
Charge Carrier Dynamics ◽  
Nm Range

Ultrafast broadband transient absorption spectroscopy elucidates charge carrier dynamics in the perovskite CH3NH3PbI3.

scholarly journals Charge Carrier Dynamics of Photoexcited Co3O4 in Methanol: Extending High Harmonic Transient Absorption Spectroscopy to Liquid Environments

Nano Letters ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 5883-5890 ◽  
Author(s):  
L. Robert Baker ◽  
Chang-Ming Jiang ◽  
Stephen T. Kelly ◽  
J. Matthew Lucas ◽  
Josh Vura-Weis ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
High Harmonic ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Charge Carrier Dynamics

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.

scholarly journals Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

2017 ◽  
Vol 19 (8) ◽  
pp. 6006-6012 ◽  
Author(s):  
Sesha Bamini N. ◽  
Hynek Němec ◽  
Karel Žídek ◽  
Mohamed Abdellah ◽  
Mohammed J. Al-Marri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Transient Absorption ◽  
Terahertz Spectroscopy ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Cdse Quantum Dots ◽  
Electron Dynamics ◽  
Time Resolved ◽  
Charge Carrier Dynamics

Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy.

scholarly journals Origin of the overall water splitting activity of Ta3N5 revealed by ultrafast transient absorption spectroscopy

2019 ◽  
Vol 10 (20) ◽  
pp. 5353-5362 ◽  
Author(s):  
Dharmapura H. K. Murthy ◽  
Hiroyuki Matsuzaki ◽  
Zheng Wang ◽  
Yohichi Suzuki ◽  
Takashi Hisatomi ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
Overall Water Splitting ◽  
Charge Carrier Dynamics ◽  
Ultrafast Transient Absorption

A detailed transient absorption spectroscopy study efficiently correlates charge carrier dynamics with the overall water splitting efficiency in Ta3N5 photocatalyst.

scholarly journals Charge carrier dynamics of methylammonium lead iodide: from PbI2-rich to low-dimensional broadly emitting perovskites

2016 ◽  
Vol 18 (16) ◽  
pp. 10800-10808 ◽  
Author(s):  
Johannes R. Klein ◽  
Oliver Flender ◽  
Mirko Scholz ◽  
Kawon Oum ◽  
Thomas Lenzer
Keyword(s):  
Charge Carrier ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Lead Iodide ◽  
Charge Carrier Dynamics ◽  
Carrier Recombination ◽  
Recombination Rate Constant ◽  
Low Dimensional ◽  
Methylammonium Lead Iodide

Broadband transient absorption spectroscopy reveals an increased carrier recombination rate constant of low-dimensional perovskites.

Impact of Oxygen Vacancy Occupancy on Charge Carrier Dynamics in BiVO4 Photoanodes

2019 ◽  
Vol 141 (47) ◽  
pp. 18791-18798 ◽  
Author(s):  
Shababa Selim ◽  
Ernest Pastor ◽  
Miguel García-Tecedor ◽  
Madeleine R. Morris ◽  
Laia Francàs ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics
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