Аннотация:Solvent additives are shown to drastically affect internal ordering of the polymeric component of bulk heterojunction solar cells. Grazing incidence wide angle x-ray scattering measurements reveal that additives affect polymeric crystallite type, perfection, orientation, and population within the film. Improvements in device performance that result from additive processing are well correlated with increases in the population of crystallites within the film of the type capable of π–π stacking. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
