scholarly journals Anomalous Transient Photocurrent

10.5772/23262 ◽  
2011 ◽  
Author(s):  
Laigui Hu ◽  
Kunio Awag
Keyword(s):  
Transient Photocurrent

High Field Electron Drift in a-Si:H

1993 ◽  
Vol 297 ◽  
Author(s):  
Qing Gu ◽  
Eric A. Schiff ◽  
Jean Baptiste Chevrier ◽  
Bernard Equer
Keyword(s):  
Electric Fields ◽  
High Field ◽  
Drift Mobility ◽  
Time Range ◽  
Electron Drift ◽  
Parameter Change ◽  
Transient Photocurrent ◽  
Field Mobility ◽  
High Electric Fields ◽  
Electron Drift Mobility

We have measured the electron drift mobility in a-Si:H at high electric fields (E ≤ 3.6 x 105 V%cm). The a-Si:Hpin structure was prepared at Palaiseau, and incorporated a thickp+ layer to retard high field breakdown. The drift mobility was obtained from transient photocurrent measurements from 1 ns - 1 ms following a laser pulse. Mobility increases as large as a factor of 30 were observed; at 77 K the high field mobility de¬pended exponentially upon field (exp(E/Eu), where E u= 1.1 x 105 V%cm). The same field dependence was observed in the time range 10 ns – 1 μs, indicating that the dispersion parameter change with field was negligible. This latter result appears to exclude hopping in the exponential conduction bandtail as the fundamental transport mechanism in a-Si:H above 77 K; alternate models are briefly discussed.

Enhanced Photocatalytic Activity of Agbr Photocatalyst via Constructing Heterogeneous Junctions With Reduced Graphene

2021 ◽  
Author(s):  
Tongtong Zhang ◽  
Qi Yin ◽  
Menghan Zhang ◽  
Siyu Zhang ◽  
Yanning Shao ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Contaminants ◽  
Degradation Mechanism ◽  
Silver Bromide ◽  
Active Components ◽  
Transient Photocurrent ◽  
Photogenerated Electrons ◽  
Reduced Graphene ◽  
Photocatalytic Activities ◽  
Photocatalytic Degradation Mechanism

Abstract A series of rGO/AgBr heterojunction photocatalysts were fabricated through a facile solvothermal method. The rGO/AgBr heterostructures were characterized by XPS, XRD, UV-Vis DRS, SEM, TEM, PL and the transient photocurrent responses. The XRD, SEM, XPS and TEM analyzes indicated that the graphene and silver bromide were successfully compounded without other impurities. The UV-Vis DRS exhibited that the composites have better optical properties than pure silver bromide. The PL and the transient photocurrent responses demonstrated that the addition of graphene significantly promotes the separation of photogenerated electrons and holes. Subsequently, the photocatalytic activities of rGO/AgBr composites were studied by degrading Rhodamine B (RhB). It turned out that the degradation rate of RhB by the rGO/AgBr heterojunction photocatalysts were significantly higher than that by pure AgBr. What’s more, to study the photocatalytic degradation mechanism of RhB by rGO/AgBr heterostructures, the trapping experiments were used to identify the main active components. This work confirmed that the photocatalytic degradation performance of the catalyst was greatly improved after doping graphene, which provided certain data support for degradation of organic contaminants in water.

scholarly journals Photogenerated carrier profile determination in polymeric light-emitting diodes by steady-state and transient photocurrent measurements

2006 ◽  
Vol 135 (2) ◽  
pp. 103-107 ◽  
Author(s):  
L.F. Santos ◽  
R.F. Bianchi ◽  
R.M. Faria ◽  
S. Mergulhão
Keyword(s):  
Steady State ◽  
Light Emitting Diodes ◽  
Photogenerated Carrier ◽  
Light Emitting ◽  
Transient Photocurrent

Delayed Field Transient Photocurrent Measurements in a-Si:H

1992 ◽  
Vol 258 ◽  
Author(s):  
Homer Antoniadis ◽  
E. A. Schiff
Keyword(s):  
Applied Voltage ◽  
Delay Time ◽  
Deep Level ◽  
Time Of Flight ◽  
Laser Flash ◽  
Field Technique ◽  
Transient Photocurrent

ABSTRACTWe have measured the transient photocurrent in “time-of-flight” structures of a-Si:H using bias voltages applied following photocarrier generation by a laser flash. The delayed field technique appears promising both as a probe of the deep level distribution and also of photocarrier thermalization. We describe a simplified theory for the delayed field transients including the effects of the delay time and the magnitude of the applied voltage. The theory accounts for the measurements adequately.

Investigation of oxide growth and stability on n-GaAs and n-InP by coupling transient photocurrent and surface analysis

2001 ◽  
Vol 175-176 ◽  
pp. 734-739 ◽  
Author(s):  
I Gérard ◽  
N Simon ◽  
A Etcheberry
Keyword(s):  
Surface Analysis ◽  
Oxide Growth ◽  
Transient Photocurrent

Insights into the charge carrier dynamics in two-terminal tandem solar cells using transient photocurrent spectroscopy

2021 ◽  
Author(s):  
Anaranya Ghorai ◽  
Prashant Kumar ◽  
Suhas Mahesh ◽  
Yen‐Hung Lin ◽  
Henry J Snaith ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Carrier Dynamics ◽  
Tandem Solar Cells ◽  
Transient Photocurrent ◽  
Charge Carrier Dynamics ◽  
Photocurrent Spectroscopy

scholarly journals Improvement of Photocatalytic Performance for the g-C3N4/MoS2 Composite Used for Hypophosphite Oxidation

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Wei Guan ◽  
Kuang He ◽  
Jianwei Du ◽  
Yong Wen ◽  
Mingshan Li ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
High Efficiency ◽  
Emission Spectra ◽  
Chelating Agent ◽  
Photoelectron Spectra ◽  
X Ray Diffraction ◽  
Response Measurement ◽  
X Ray ◽  
Transient Photocurrent ◽  
Oxidation Efficiency

The synthesized g-C3N4/MoS2 composite was a high-efficiency photocatalytic for hypophosphite oxidation. In this work, a stable and cheap g-C3N4 worked as the chelating agent and combined with the MoS2 materials. The structures of the fabricated g-C3N4/MoS2 photocatalyst were characterized by some methods including X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectra (XPS). Moreover, the photocatalytic performances of various photocatalysts were measured by analyzing the oxidation efficiency of hypophosphite under visible light irradiation and the oxidation efficiency of hypophosphite using the g-C3N4/MoS2 photocatalyst which was 93.45%. According to the results, the g-C3N4/MoS2 composite showed a promising photocatalytic performance for hypophosphite oxidation. The improved photocatalytic performance for hypophosphite oxidation was due to the effective charge separation analyzed by the photoluminescence (PL) emission spectra. The transient photocurrent response measurement indicated that the g-C3N4/MoS2 composites (2.5 μA cm–2) were 10 times improved photocurrent intensity and 2 times improved photocurrent intensity comparing with the pure g-C3N4 (0.25 μA cm–2) and MoS2 (1.25 μA cm–2), respectively. The photocatalytic mechanism of hypophosphite oxidation was analyzed by adding some scavengers, and the recycle experiments indicated that the g-C3N4/MoS2 composite had a good stability.

Contrasting transient photocurrent characteristics for thin films of vacuum-doped “grey” TiO2 and “grey” Nb2O5

2018 ◽  
Vol 237 ◽  
pp. 339-352 ◽  
Author(s):  
Moisés A. de Araújo ◽  
Murilo F. Gromboni ◽  
Frank Marken ◽  
Stephen C. Parker ◽  
Laurence M. Peter ◽  
...  
Keyword(s):  
Thin Films ◽  
Transient Photocurrent

Transient photocurrent measurements in alkali chalcogenide ternary compound semiconductors

2012 ◽  
Vol 28 (1) ◽  
pp. 015022 ◽  
Author(s):  
Z Liu ◽  
J A Peters ◽  
H Li ◽  
M G Kanatzidis ◽  
B W Wessels
Keyword(s):  
Ternary Compound ◽  
Compound Semiconductors ◽  
Transient Photocurrent
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