Organic Solar Cells (OSCs) have attracted substantial commercial and scientific interest as they provide a pathway to realizing a renewable energy source that is portable (flexible, lightweight) and potentially inexpensive. State-of-the-art OSCs are based on the bulk heterojunction (BHJ) architecture, which is a blend between a conjugated polymer (electron donor D), and a fullerene (electron acceptor A). While fullerene based acceptors form the basis of present-day OSC research and commercial drive, their use is far from ideal. We propose to examine the structure and diffusion of a new solution processable, small molecule non-fullerene acceptor developed by our group in combination with two commonly-used donors. The aim is to understand the self-organisation of these materials that is believed to be responsible for their good performance in model devices.