Characterization of FeS2-pyrite thin films synthesized by sulphuration of amorphous iron oxide films pre-deposited by spray pyrolysis |
| |
Authors: | B. Ouertani, J. Ouerfelli, M. Saadoun, B. Bessaï s, H. Ezzaouia,J.C. Bern de |
| |
Affiliation: | aInstitut National de Recherche Scientifique et Technique, Laboratoire de Photovoltaïque et des Semi-conducteurs, BP 95, 2050 Hammam-Lif, Tunisia bFaculté des Sciences de Tunis,Laboratoire de Physique de la Matière Condensée, El Manar II-Tunis, Tunisia cEquipe de Physique des Solides pour l'Electronique, Groupe Couches Minces et Matériaux Nouveaux, Université de Nantes, FSTN, 2 rue de la Houssinière, BP 9209 44322 Nantes Cedex 3, France |
| |
Abstract: | FeS2-thin films with good crystallinity were synthesized by a simple method which consists of sulphuration, under vacuum, of amorphous iron oxide thin films pre-deposited by spray pyrolysis of FeCl3·6H2O (0.03 M)-based aqueous solution onto glass substrates heated at 350 °C. At optimum sulphuration temperature (450 °C) and duration (6 h), black green layers having granular structure and high absorption coefficient (5.104 cm−1) were obtained. The study of the electrical properties of the as-prepared films vs. the temperature variations showed three temperature domain dependence of the conductivity behaviour. The first one corresponds to the high temperature range (330 K–550 K) for which an Arrhenius plot type was obtained. The activation energy value was estimated at about 61.47 meV. The second domain corresponding to the intermediate temperature range (80 K–330 K) showed a variable activation energy between the grain boundaries. The barrier height, q¯, was estimated to 27±0.5 meV, and the standard deviation, qσ, was evaluated at about 14±0.5 meV. We found that at lower temperatures (20 K–80 K), the conductivity is governed by two conduction types. The density of localised states, was about 2.45×1020 eV−1 cm−3. |
| |
Keywords: | Thin films Iron oxide (Fe2O3) Spray pyrolysis Sulphuration Pyrite FeS2 Electrical properties Optical properties |
本文献已被 ScienceDirect 等数据库收录! |
|