Band alignment investigations of heterostructure NiO/TiO2 nanomaterials used as efficient heterojunction earth-abundant metal oxide photocatalysts for hydrogen production

2017 ◽  
Vol 19 (29) ◽  
pp. 19279-19288 ◽  
Author(s):  
Md. T. Uddin ◽  
Y. Nicolas ◽  
C. Olivier ◽  
W. Jaegermann ◽  
N. Rockstroh ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Metal Oxide ◽  
Band Alignment ◽  
Band Bending ◽  
Earth Abundant ◽  
Tio2 Nanomaterials

Earth-abundant NiO/TiO2 heterostructures lead to enhanced H2 production by methanol photoreforming due to favorable band bending at the interface of the NiO/anatase TiO2 p–n heterojunction.

scholarly journals Sb2S3/TiO2 Heterojunction Photocathodes: Band Alignment and Water Splitting Properties

2020 ◽  
Author(s):  
Rajiv Ramanujam Prabhakar ◽  
Thomas Moehl ◽  
Sebastian Siol ◽  
Jihye Suh ◽  
David Tilley
Keyword(s):  
Buffer Layer ◽  
Water Splitting ◽  
Elemental Sulfur ◽  
Band Alignment ◽  
Band Bending ◽  
Co Catalyst ◽  
Conduction Band Offset ◽  
Photovoltaic Applications ◽  
Earth Abundant ◽  
Further Development

<p>Antimony sulfide (Sb<sub>2</sub>S<sub>3</sub>) is a promising light absorbing semiconductor for photovoltaic applications, though it remains vastly unexplored for photoelectrochemical water splitting. Sb<sub>2</sub>S<sub>3</sub> was synthesized by a simple sulfurization of electrodeposited antimony metal at relatively low temperatures (240-300°C) with elemental sulfur. Using a TiO<sub>2</sub> buffer layer and a platinum co-catalyst, photocurrent densities up to ~ 9 mA cm<sup>-2</sup> were achieved at -0.4 V vs. RHE in 1 M H<sub>2</sub>SO<sub>4</sub> under one sun illumination. Using XPS band alignment studies and potential dependent IPCE measurements, a conduction band offset of 0.7 eV was obtained for the Sb<sub>2</sub>S<sub>3</sub>/TiO<sub>2 </sub>junction as well as an unfavorable band bending at the heterointerface, which explains the low photovoltage that was observed (~ 0.1 V).<sub> </sub>Upon inserting an In<sub>2</sub>S<sub>3</sub> buffer layer, which offers a better band alignment, a 0.15 V increase in photovoltage was obtained. The excellent PEC performance and the identification of the origin of the low photovoltage of the Sb<sub>2</sub>S<sub>3</sub> photocathodes in this work pave the way for the further development of this promising earth abundant light absorbing semiconductor for solar fuels generation.</p>

scholarly journals Sb2S3/TiO2 Heterojunction Photocathodes: Band Alignment and Water Splitting Properties

2020 ◽  
Author(s):  
Rajiv Ramanujam Prabhakar ◽  
Thomas Moehl ◽  
Sebastian Siol ◽  
Jihye Suh ◽  
David Tilley
Keyword(s):  
Buffer Layer ◽  
Water Splitting ◽  
Elemental Sulfur ◽  
Band Alignment ◽  
Band Bending ◽  
Co Catalyst ◽  
Conduction Band Offset ◽  
Photovoltaic Applications ◽  
Earth Abundant ◽  
Further Development

<p>Antimony sulfide (Sb<sub>2</sub>S<sub>3</sub>) is a promising light absorbing semiconductor for photovoltaic applications, though it remains vastly unexplored for photoelectrochemical water splitting. Sb<sub>2</sub>S<sub>3</sub> was synthesized by a simple sulfurization of electrodeposited antimony metal at relatively low temperatures (240-300°C) with elemental sulfur. Using a TiO<sub>2</sub> buffer layer and a platinum co-catalyst, photocurrent densities up to ~ 9 mA cm<sup>-2</sup> were achieved at -0.4 V vs. RHE in 1 M H<sub>2</sub>SO<sub>4</sub> under one sun illumination. Using XPS band alignment studies and potential dependent IPCE measurements, a conduction band offset of 0.7 eV was obtained for the Sb<sub>2</sub>S<sub>3</sub>/TiO<sub>2 </sub>junction as well as an unfavorable band bending at the heterointerface, which explains the low photovoltage that was observed (~ 0.1 V).<sub> </sub>Upon inserting an In<sub>2</sub>S<sub>3</sub> buffer layer, which offers a better band alignment, a 0.15 V increase in photovoltage was obtained. The excellent PEC performance and the identification of the origin of the low photovoltage of the Sb<sub>2</sub>S<sub>3</sub> photocathodes in this work pave the way for the further development of this promising earth abundant light absorbing semiconductor for solar fuels generation.</p>

Chalcogenide As Inorganic Transport Layer in Perovskite Solar Cell

2021 ◽  
Author(s):  
Atul kumar
Keyword(s):  
Solar Cell ◽  
Fill Factor ◽  
Perovskite Solar Cell ◽  
Hole Transport ◽  
Band Alignment ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Band Offset ◽  
Primary Concern ◽  
Earth Abundant

Abstract Fill factor (FF) deficit and stability is a primary concern with the perovskite solar cell. Resistance values and band alignment at junction interface in perovskite are causing low fill factor. Moisture sensitivity of methylammonium lead halide perovskite is causing a stability issue. We tried to solve these issues by using inorganic hole transport layer (HTL). FF is sensitive to the band offset values. We study the band alignment/band offset effect at the Perovskite /HTL junction. Inorganic material replacing Spiro-MeOTAD can enhance the stability of the device by providing an insulation from ambient. Our simulation study shows that the earth abundant p-type chalcogenide materials of SnS as HTL in perovskite is comparable to Spiro-MeOTAD efficiency.

High-sensitivity hybrid PbSe/ITZO thin film-based phototransistor detecting from 2100 nm to 2500 nm near-infrared illumination

2022 ◽  
Author(s):  
Ali Sehpar Shikoh ◽  
Gi Sang Choi ◽  
Sungmin Hong ◽  
Kwang Seob Jeong ◽  
Jaekyun Kim
Keyword(s):  
Thin Film ◽  
Metal Oxide ◽  
High Performance ◽  
Near Infrared ◽  
Effective Diffusion ◽  
Band Alignment ◽  
Oxide Thin Film ◽  
Photogenerated Carrier ◽  
Channel Layer ◽  
Metal Oxide Thin Film

Abstract We report that high absorption PbSe colloidal quantum dots (QDs) having a peak absorbance beyond 2100 nm were synthesized and incorporated into InSnZnO (ITZO) channel layer-based thin film transistors (TFTs). It was intended that PbSe QDs with proportionally less photocurrent modulation can be remedied by semiconducting and low off-current ITZO-based TFT configuration. Multiple deposition scheme of PbSe QDs on ITZO metal oxide thin film gave rise to nearly linear increase of film thickness with acceptably uniform and smooth surface (less than 10 nm). Hybrid PbSe/ITZO thin film-based phototransistor exhibited the best performance of near infrared (NIR) detection in terms of response time, sensitivity and detectivity as high as 0.38 s, 3.91 and 4.55 × 107 Jones at room temperature, respectively. This is indebted mainly from the effective diffusion of photogenerated carrier from the PbSe surface to ITZO channel layer as well as from the conduction band alignment between them. Therefore, we believe that our hybrid PbSe/ITZO material platform can be widely used to be in favour of incorporation of solution-processed colloidal light absorbing material into the high-performance metal oxide thin film transistor configuration.

Type II Band Alignment inSi1−xGex/Si(001)Quantum Wells: The Ubiquitous Type I Luminescence Results from Band Bending

1997 ◽  
Vol 79 (2) ◽  
pp. 269-272 ◽  
Author(s):  
M. L. W. Thewalt ◽  
D. A. Harrison ◽  
C. F. Reinhart ◽  
J. A. Wolk ◽  
H. Lafontaine
Keyword(s):  
Quantum Wells ◽  
Band Alignment ◽  
Type I ◽  
Type Ii ◽  
Band Bending

scholarly journals Band alignment and band bending at α-Ga2O3/ZnO n-n isotype hetero-interface

2019 ◽  
Vol 115 (20) ◽  
pp. 202101 ◽  
Author(s):  
X. H. Chen ◽  
Y. T. Chen ◽  
F.-F. Ren ◽  
S. L. Gu ◽  
H. H. Tan ◽  
...  
Keyword(s):  
Band Alignment ◽  
Band Bending

Controllable design of double metal oxide (NiCo2O4)-modified CdS for efficient photocatalytic hydrogen production

2019 ◽  
Vol 21 (8) ◽  
pp. 4501-4512 ◽  
Author(s):  
Xian Yan ◽  
Zhiliang Jin ◽  
Yupeng Zhang ◽  
Hai Liu ◽  
Xiaoli Ma
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Metal Oxide ◽  
Hydrothermal Method ◽  
High Efficiency ◽  
Composite Photocatalyst ◽  
Photocatalytic Hydrogen Production ◽  
High Temperature Calcination

In the present study, we have successfully synthesized a kind of high-efficiency NiCo2O4/CdS composite photocatalyst using the hydrothermal method and high-temperature calcination.

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