Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74642
PIRA download icon_1.1View/Download Full Text
Title: High photoelectrochemical activity and stability of Au-WS2/silicon heterojunction photocathode
Authors: Zeng, L 
Liu, Y 
Lin, S 
Qarony, W 
Tao, L 
Chai, Y 
Zhang, X 
Lau, SP 
Tsang, YH 
Issue Date: Jan-2018
Source: Solar energy materials and solar cells, Jan. 2018, v. 174, p. 300-306
Abstract: Although silicon has been widely employed as light harvesting antenna in photocatalysts due to its cost advantage, it suffers from low efficiency and poor stability due to photocorrosion of Si. To overcome this problem, a heterojunction photocathode was produced by coating a WS2 thin-film on p-type Si. Our proposed method can further improve the photocatalytic activity and stability. The homogeneous WS2 films with large surface area and tens-of-nanometers in thickness were prepared through magnetron and post-annealing process. This film not only functions as a protective layer to isolate the Si from the harsh electrochemical environment, but also forms a junction at the interface between WS2 and p-type Si to facilitate the charge separation and transport processes. Additionally, further enhancement of visible photocatalytic performance was achieved by depositing Au film on WS2/p-Si through thermal evaporation and the highest value of the photocurrent intensity achieved is up to ~ 4.5 μA/cm2 at 0 V versus Ag/AgCl. Besides, photoelectrochemical instability of WS2/p-Si electrodes can be minimized by adding Au coating. Our results suggest that adding the Au-WS2 on p-Si can benefit carrier separation and providing physical protection of the Si layer. Therefore, it can further improve the overall photocatalytic activity and stability.
Keywords: Heterojunction
Photocatalyst
Photocathode
WS2
WS2/Si
Publisher: Elsevier
Journal: Solar energy materials and solar cells 
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2017.07.042
Rights: © 2017 Published by Elsevier B.V.
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The following publication Zeng, L., Liu, Y., Lin, S., Qarony, W., Tao, L., Chai, Y., ... & Tsang, Y. H. (2018). High photoelectrochemical activity and stability of Au-WS2/silicon heterojunction photocathode. Solar Energy Materials and Solar Cells, 174, 300-306 is available at https://doi.org/10.1016/j.solmat.2017.07.042.
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Zeng_High_Photoelectrochemical_Activity.pdfPre-Published version1.53 MBAdobe PDFView/Open
Open Access Information
Status open access
File Version Final Accepted Manuscript
Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page views

124
Last Week
0
Last month
Citations as of Nov 20, 2022

Downloads

6
Citations as of Nov 20, 2022

SCOPUSTM   
Citations

14
Last Week
0
Last month
Citations as of Nov 24, 2022

WEB OF SCIENCETM
Citations

13
Last Week
0
Last month
Citations as of Nov 24, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.