| Structural, Morphological, Optical and Electrical Properties
of CoFeS2
and NiFeS2
Thin Films Prepared Using Spray
Pyrolysis |
Asma Arfaoui,a,* Ammar Mhamdi,b, c Bilel Khalfallah,d
Nadia Zaidia
and Mosbah Amloukc
Pages : 189-195
DOI: 10.1080/0371750X.2025.2527600 |
| Abstract |
| Using the spray pyrolysis technique, this study presents the characteristics of CoFeS2
and NiFeS2
thin films prepared on glass substrate, including their structure,
morphological, chemical composition and optical properties. X-ray diffraction,
scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy were
used to analyze the obtained thin films. The results of the investigations showed a
hexagonal phase and a cubic structure with crystallite size equal to 88 and 86 nm for
CoFeS2
and NiFeS2
, respectively. SEM images presented tightly packed thin films
containing granular grains with grain size between 10 and 30 nm. It was pointed out
that the first material with p type and a gap energy of the order of 1.49±0.05 eV, which
matches well the maximum of the solar spectrum, can play the role of an absorber in
solar photopile. On the contrary, the second material can serve, with its n type
semiconductor and its gap energy of 2.49±0.05 eV, as a buffer layer in a standard
solar cell such as NiFeS2 (n) / CoFeS2
(p). Such solar cells based on ternary sulfide
may be of interest to serve as an important device in various sensitivity applications.
[Keywords: CoFeS2
, NiFeS2
, Thin film, Spray pyrolysis, Physical study, Hall mobility] |
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