This image illustrates dendritic fractal growth patterns resembling snowflakes in the P3HT:PCBM polymer blend. These carbon-rich structures give us important information for understanding a degradation mechanism that affects the performance of polymer blends for organic solar cells.

This image was taken with a state-of-the-art FEI Quanta 200 FEG Environmental Scanning Electron Microscope at Princeton University’s Image and Analysis Center.