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Pyrite thin films on amorphous substrates: Interaction with the substrate and doping effects

AuthorsFlores, Eduardo; Yoda, Satoko; Morales, Carlos; Caballero-Calero, Olga ; Díaz-Chao, Pablo; Martín-González, Marisol; Ares, José R.; Ferrer, Isabel J.; Sánchez, Carlos
Issue Date28-Feb-2019
PublisherElsevier BV
CitationThin Solid Films 672: 138-145 (2019)
AbstractRecent published literature dealing with FeS pyrite (thin films and single crystals) faces a few and relevant issues: the low photovoltage presented by pyrite (mainly related to the singular nature of its surface), the not yet clearly defined way of making available n and p type reliable samples and the relevance of their stoichiometry. To address the second and third issues, Fe thin films, Ti/Fe and Co/Fe bilayers deposited on sodalime glass and amorphous quartz substrates have been sulfurated at different temperatures (T) (T ≲ 600C) during 20 h to obtain pyrite thin films. Seebeck coefficient and Hall Effect measurements have been carried out at room temperature with the sulfurated samples. It has been found that sulfurated Ti/Fe on sodalime glass presents a change of the Seebeck coefficient sign (from negative to positive) due to a strong interaction of the Ti layer with the substrate, which is not present in the Ti/Fe samples deposited on amorphous quartz. As a consequence of the interaction, a new TiO layer is formed between the sodalime glass substrate and the pyrite layer. Sulfurated Co/Fe bilayers on sodalime glass show a coherent behavior according to the obtained results and previously published works. They all appear to be n-type semiconductors when T ≳ 175C. Non-intentionally doped Fe thin films on sodalime glass behave in a non-conclusive fashion from the point of view of their electrical transport characterization. The Seebeck coefficient (S) of the sulfurated films appear to be S > 0 for all values of T. However, the value and sign of the Hall constant behave in a non-reproducible way. Results are discussed on the light of present knowledge of synthetic pyrite thin films growth and doping.
Publisher version (URL)http://dx.doi.org/10.1016/j.tsf.2019.01.020
Identifiersdoi: 10.1016/j.tsf.2019.01.020
issn: 0040-6090
Appears in Collections:(CNM) Artículos
(IMN-CNM) Artículos
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