info:eu-repo/semantics/article
Titanium oxide:fullerene composite films as electron collector layer in organic solar cells and the use of an easy-deposition cathode
Autor
JOSE LUIS MALDONADO RIVERA
Gabriel Ramos Ortiz
Institución
Resumen
Here is reported the use of a titanium oxide:fullerene (TiOx:PC71BM) composite film as electron collector
layer in organic photovoltaic devices (OPV cells). OPV cells were fabricated under the bulk heterojunction
architecture: the active layer was a blend of either the photoconductor polymer MEH–PPV or P3HT with
the fullerene derivative PC71BM. As cathode the eutectic alloy of Bi, In and Sn, known as Field’s metal, was
used. The melting point of this alloy is above 62 C, which makes it suitable for a vacuum-free deposition
process and easy and fast device test. Cell fabrication and testing were carried out at normal room conditions.
For OPV cells based on MEH–PPV, the composite thin electron collector layer improved the power
conversion efficiency (g) from 1.12% to 2.07%, thus the g increase was about 85%. Meanwhile, for devices
based on P3HT the use of the composite film improved the photocurrent in almost 1 mA/cm2 and the efficiency
slightly increase from 2.48% to 2.68%.