Desempenho da mesofauna do solo sob vegetação secundária enriquecida com leguminosas arbóreas de rápido crescimento.

bitstream/item/48900/1/Boletim-PD-03-AMAZ-ORIENTAL.pd

Analysis of essential oils from breu samples collected in Alto Erepecuru region, Brazilian Amazon.

Poster 167. SBOE 2015

Growth and characterization of Cu2ZnSn(S,Se)4 thin films for solar cells

Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) with their band gap energies around 1.45 eV and 1.0 eV, respectively, can be used as the absorber layer in thin film solar cells. By using a mixture of both compounds, Cu2ZnSn(S,Se)4 (CZTSSe), a band gap tuning may be possible. The latter material has already shown promising results such as solar cell efficiencies up to 10.1%. In this work, CZTSSe thin films were grown in order to study its structure and to establish the best growth precursors. SEM micrographs reveal an open columnar structure for most samples and EDS composition profiling of the cross sections show different selenium gradients. X-ray diffractograms show different shifts of the kesterite/stannite (1 1 2) peak, which indicate the presence of CZTSSe. From Raman scattering analysis, it was concluded that all samples had traces of CZTS and CZTSSe. The composition of the CZTSSe layer was estimated using X-ray diffraction and Raman scattering and both results were compared. It was concluded that Se diffused more easily in precursors with ternary Cu–Sn–S phases and metallic Zn than in precursors with ZnS and/or CZTS already formed. It was also showed that a combination of X-ray diffraction and Raman scattering can be used to estimate the ratio of S per Se in CZTSSe samples

Identificação, distribuição e abundância dos caranguejos do gênero Uca na península de Ajuruteua, nordeste do Pará, Brasil.

Resumo P-2207

The effects of different culture conditions on the production of volatiles from Lippia origanoides Kunth (Verbenaceae).

Poster 096. SBOE 2015