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Aqueous‐Based Low‐Temperature Synthesis and Thin‐Film Properties of Oxysulfide BiCuOS Nanoparticles
Author(s) -
Gamon J.,
Haller S.,
Giaume D.,
Robert C.,
Thomas C. M.,
D'Alençon L.,
Buissette V.,
Le Mercier T.,
Barboux P.
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900733
Subject(s) - materials science , nanoparticle , thin film , photocurrent , semiconductor , spin coating , cadmium sulfide , aqueous solution , colloid , grain boundary , nanotechnology , thermal stability , chemical engineering , stacking , diode , optoelectronics , chemistry , organic chemistry , composite material , microstructure , engineering , metallurgy
BiCuOS is a nontoxic p‐type semiconductor that is a promising candidate for photoelectric applications. The formation of thin films with a good electronic transport at the grain boundaries, while avoiding thermal treatment detrimental to its chemical stability is a challenge. We have developed a chemical method for the direct synthesis of stable colloidal suspensions of BiCuOS nanoparticles from soluble precursors. These colloidal solutions were stabilized with a catechol functionalized poly‐3‐hexylthiophene that allows easy spin‐coating deposition and favors electronic transport along the grain boundaries. Stacking of ZnO–BiCuOS layers were achieved, allowing preparation of n–p junctions. These act as rectifying diodes and are strongly photosensitive, with I ph /I dark =85 corresponding to an enhancement of the photocurrent of more than two orders of magnitude compared to that of BiCuOS alone. This energy‐efficient and low‐cost method is a further step in the development of new sulfide semiconductor devices.