Morphologies of P3HT and P3HT/PCBM Thin Films Prepared by Drop Casting and Spin Coating

Abstract

P3HT and P3HT/PCBM organic films are prepared by drop casting and spin coating and are used to fabricate solar cells on ITO. The solar cell properties are investigated by UVvisible absorption spectroscopy and X-ray diffraction (XRD). and their morphologies are discussed. The results indicate that the molecular chains of the P3HT film prepared by drop casting are perpendicular to the substrate, whereas those of the film prepared by spin coating are oriented parallel to the substrate. P3HT/PCBM films are prepared by spin coating using different PCBM/P3HT ratios.