It is then important to understand what is the initial state of the conjugated polymer solution and how the solution processing directs further assembly. Many studies have focused on tuning the solution state of conjugated polymers prior to processing. The use of solution aggregation through methods such as applying UV light , ultrasonication , tuning solvent quality , or forming liquid crystalline mesophases has been shown to promote the formation of fibrillar or rod-like aggregates. The formation of these initial aggregates has been shown to enhance alignment and direct further aggregation of the conjugated polymers as they form thin films .