Abstract
Copper sulfides are materials with different technological applications due to different possibilities of phases, which result in different properties. Thus, obtaining particles with different stoichiometry of the materials is of great interest. Two simple chemical routes were used to obtain copper sulfides (Cu2-xS) particles of different phases and stoichiometry. One of the obtained powders was used for thin film deposition through resistive evaporation and characterized. From scanning electron microscopy the particle size was found as around 500 nm. The second route leads to non-stoichiometric powder with characteristic CuS, Cu9S5 and Cu2S planes detected in the XRD diffractograms. Thin films from this route were also obtained by resistive evaporation. The amorphous film obtained after evaporation was submitted to thermal annealing at 200 ° C/2h, becoming semi-crystalline. The deposited film showed good adhesion to the substrate and low roughness, in addition to a bandgap of 2.5 ± 0.1 eV and a resistivity of 1x10-2 Ω.cm, values in good agreement with those reported in the literature. The techniques used here proved to be of good quality for deposition of copper sulfide films, and can be used as a simpler alternative in addition to commonly used for deposition of copper sulfide films.
Highlights
Copper sulfide (Cu2-xS) has received considerable attention due to its potential applicability as coating for solar cells[1,2], radiation filters for windows, electroconductive coatings on organic polymers[3], cathode in lithium batteries[4], and as active layer in memory switching devices[5]
Regardless of that, the fundamental absorption edge, which occurs around 500 nm, is in good agreement with the results found in the literature for Cu2S films[16]
A more in-depth study about gases present in the atmosphere that adsorb on the surface of Cu2-xS needs to be done so that the hypothesis can be corroborated, since a few works are found in the literature concerning copper sulfides use for gas sensing, mostly pointing to its use for sensors of ammonia gas[25,26]
Summary
Copper sulfide (Cu2-xS) has received considerable attention due to its potential applicability as coating for solar cells[1,2], radiation filters for windows, electroconductive coatings on organic polymers[3], cathode in lithium batteries[4], and as active layer in memory switching devices[5]. The various application possibilities are due to the various existing Cu2-xS phases, which produce distinct optical, electronic and structural properties[6]. As pointed out by Grozdanov[9], films deposited by chemical bath on smooth substrates present problems of adhesion and low uniformity. There is great interest in alternative techniques for deposition of Cu2-xS that are simpler when compared to CVD and sputtering, and that have good adhesion to the substrate and good structural characteristics. This work presents the description of two chemical routes and their parameters to obtain Cu2-xS particles with distinct stoichiometries, so that they can be used in the applications such as those described above. Besides the improvements on adhesion of film to the substrate and the homogeneity, this combined technique allows innovation concerning deposition of sample distinct shapes, such as nanocomposites or heterostructures
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
