RESUMEN
Silicon-based tandem solar cells incorporating low-cost, abundant, and non-toxic metal oxide materials can increase the conversion efficiency of silicon solar cells beyond their conventional limitations with obvious economic and environmental benefits. In this work, the electrical characteristics of a metal oxide thin-film heterojunction solar cell based on a cuprous oxide (Cu2O) absorber layer were investigated. Highly Al-doped n-type ZnO (AZO) and undoped p-type Cu2O thin films were prepared on quartz substrates by magnetron sputter deposition. The electrical and optical properties of these thin films were determined from Hall effect measurements and spectroscopic ellipsometry. After annealing the Cu2O film at 900 °C, the majority carrier (hole) mobility and the resistivity were measured at 50 cm²/V·s and 200 Ω·cm, respectively. Numerical modeling was carried out to investigate the effect of band alignment and interface defects on the electrical characteristics of the AZO/Cu2O heterojunction. The analysis suggests that the incorporation of a buffer layer can enhance the performance of the heterojunction solar cell as a result of reduced conduction band offset.
RESUMEN
Se evidencia actividad tripanosomolítica de la Pt (II) pentamidina Trypanosoma venezuelense, para una DT 50: 31,8 mg/kg y DT 100: 63,72 mg/kg de peso, en el modelo ratón albino macho de 25 g. Aunque la Pt (II) pentamidina ejerce una cierta acción tripanolítica contra T. cruzi en el mismo modelo, los animales tratados con 344 mg/kg de peso, repartida entre diez dosis para diez días, mueren con una parasitemia ligeramente inferior a la de los controles no tratados y prolongan la vida 1,5 más tiempo que la de éstos