期刊
NANOMATERIALS
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/nano11010052
关键词
Sb2Se3; chemical post-deposition treatment; annealing; chemical activation; high-performance photocathode
类别
资金
- Estonian Ministry of Education and Research [PUT1495]
- [European Regional Development Fund] project Center of Excellence [TK141]
- [Center of nanomaterials research and technologies] NAMUR+
- Baltic Research Programme [S-BMT-21-1 (LT0S-2-LMT-K-01-003)]
- Norwegian Research Council [nn4608k]
A novel approach using SbCl3/glycerol-based thermochemical treatment has been proposed to control anisotropy in Sb2Se3, providing a simple and scalable alternative to physical selenium post-processing. This method successfully addresses the severe problem of anisotropy and results in high-quality compact thin films with favorable morphology, stoichiometric composition, and crystallographic orientation for improved device performance.
The fabrication of cost-effective photostable materials with optoelectronic properties suitable for commercial photoelectrochemical (PEC) water splitting represents a complex task. Herein, we present a simple route to produce Sb2Se3 that meets most of the requirements for high-performance photocathodes. Annealing of Sb2Se3 layers in a selenium-containing atmosphere persists as a necessary step for improving device parameters; however, it could complicate industrial processability. To develop a safe and scalable alternative to the selenium physical post-processing, we propose a novel SbCl3/glycerol-based thermochemical treatment for controlling anisotropy, a severe problem for Sb2Se3. Our procedure makes it possible to selectively etch antimony-rich oxyselenide presented in Sb2Se3, to obtain high-quality compact thin films with a favorable morphology, stoichiometric composition, and crystallographic orientation. The treated Sb2Se3 photoelectrode demonstrates a record photocurrent density of about 31 mA cm(-2) at -248 mV against the calomel electrode and can thus offer a breakthrough option for industrial solar fuel fabrication.
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