1Organic Photovoltaics Laboratory, Department of Physics, North Maharasthra University, Jalgaon - 425 001
2Department of Physics, University of Pune, Pune - 411 007
In this paper we present the results of our study on thermal annealing of polymer P3HT and fullerene derivative PCBM blend films. The blend films have been characterized by UV-Visible absorption spectroscopy, Optical microscopy and Small angle X-ray diffraction technique. We show that due to the low glass transition temperature of P3HT, the PCBM molecules diffuses to form aggregates the size of which increases with increase in annealing temperature. In addition the crystallinity of P3HT phase also increases.
