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Transformation on CdCO3？CdO Thin Films under Annealing in Air Atmosphere

材料科学与工程（中英文A版） 2013年第5期3卷 289-298页

作者： ruth melendrez luevano Tania Flores Papaqui Juan Carlos Ramirez Garcia Marcial Zamora Tototzintle Jorge R. Cerna Melissa Chivez Portillo Salvador Rosas Castilla Oscar Portillo Moreno School of Sciences Chemical Autonomous University of Puebla Puebla 72001 M~xico CIDS-ICUAP AutonomousUniversity of Puebla 72001 Puebla Mdxico

CdCO3 thin films had grown onto glass by chemical bath deposition (CBD), the temperature of the bath (Td) was at 20 °C. The samples were thermal annealed temperature (TAT) in air atmosphere at normal pressure for 2 h at different temperatures in the range of 300-400 °C, in order to perform the crystalline phase transformation from CdCO3→CdO, Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and optical absorption (OA) measurements were carried out to characterized the films. The proportion of constitutive elements measured by means SEM for CdCO3 as-grown were: Cd = 12.8, C = 20.0, O = 67.2; TAT (CdCO3) = 400 °C: Cd = 49.8, O = 50.2, this results indicates good stoichiometric of samples. Patterns XRD show the layer with CdCO3 which has rhombohedral crystallineas-grown peaks at: 2θ = [23.4, 30.2, 36.4, 40.1, 43.8, 48.0, 49.5, 49.9, 58.2, 61.7, 62.9 and 65.5]. TAT (CdCO3) = 400 °C completely disappeared and only peaks of CdO are identified. All of the peaks in this pattern has pure cubic phase of CdO (2θ= [33.1, 38.2, 55.3, 59.9 and 69.3]). The average grain size (GS) which was calculated from the main XRD peak by CdCO3 reduce of 34.5 nm reaching 20 nm respectively was calculated by employing Scherer"s formula. The optical absorption spectra allowed to calculate the values of forbidden bandgap energy (Eg), and hence, the evolution of Eg in the thermally spectra also showed the complete microstructural transformation from as-grown for samples with higher annealing. The critical point of CdCO3→CdO is proposed to occur at TAT = 400 °C, CdCO3 as-grown: Eg = 3.87 eV, TAT (CdCO3) = 400 °C (CdO): Eg = 2.31 eV.

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