A Novel Thermochemical Metal Halide Treatment for High-Performance Sb2Se3 Photocathodes

Author:

Polivtseva SvetlanaORCID,Adegite Joseph OlanrewajuORCID,Kois Julia,Mamedov Damir,Karazhanov Smagul Zh.ORCID,Maricheva Jelena,Volobujeva Olga

Abstract

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.

Funder

Eesti Teadusagentuur

Sihtasutus Archimedes

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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