Study on concentration effects of MEH-PPV for organic solar cells application / Hasmida Muda @Noruddin

The concentration effect of Poly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylene vinylene] or known as MEH-PPV for organic solar cells application was investigated. MEH-PPV thin film has been prepared on substrates by spin-coating method with different concentration of solutionfrom lOmg/ml to 50mg/mlat room temperature with 2000rpm speed. MEH-PPV powders with different weightwere dissolved in tetrahydrofiiran (THF) for 48 hours. The electrical properties were characterized using 2-point probe, while optical properties were obtained using UV-Visible-NIR (UVVIS-NIR). Besides for surface morphologies of the films were observed using FESEM, and thickness using surface profiler.The UV-vis spectra showed a transmittance peak at 500-600nm. The transmittance peaks reduce from 85T%-20T% as the concentration increased.From the IV measurement the result shows, at thickness 115.56nm gives the highest photoconductivity with value l^xlO^ncm)"1. The layer of MEH-PPV thin film increased as the concentration of MEH-PPV increases.