Aziz, Farhana Preparation and characterization of ternary blend polymer solar cells using solvent and thermal annealing treatment. The main objective of this study is to fabricate ternary blend polymer solar cells PSC with an optimized morphology of an active layer using solvent annealing with subsequent thermal annealing treatment. Three phases of experimental works have been designed in order to achieve the above objective. In phase I, the influences of spray coating time on the optical and morphological properties of the thin films were investigated. It was found that 10s to be the most suitable deposition time to produce thin films with an acceptable roughness, root means square RMS
Solvent vapour annealing
"Enhancing the Photovoltaic Efficiency of a Bulk Heterojunction Organic" by Swapnil Ashok Sahare
Molecular semiconductors have generated significant interest for their potential use in lightweight and mechanically flexible electronic devices. Yet, predicting how new molecular semiconductors will perform in devices remains a challenge because devices are comprised of polycrystalline thin films of molecular semiconductors, and charge transport in these films depends greatly on the details of their microstructure whose heterogeneities can span multiple length scales. The microstructure typically evolves during deposition, and thus developing organic electronics not only hinges on the success of materials discovery, but also on the ability to fine-tune deposition and processing parameters to access the thin-film structure most conducive for charge transport. This thesis explores chemical modification of a non-planar organic semiconductor, contorted hexabenzocoronene, cHBC, to tune its optoelectronic properties and processing strategies to induce structural changes in thin films.
A growing demand for new forms of renewable energy has been at the forefront of scientific research. Organic photovoltaics OPVs provide a promising alternative to the expensive inorganic solar cells used today. However, little is known about the actual morphology. A better understanding of the morphology would allow researchers to optimize device fabrication to increase the device performance. As-cast devices are limited by the processing conditions which they were casted.