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We follow the removal of 1,8-diiodooctane directly after spin-coating using ellipsometry and ion beam analysis, while using small angle neutron scattering to characterise the morphological nanostructure evolution of the film. In PffBT4T-2OD\/PC<jats:sub>71<\/jats:sub>BM devices, the power conversion efficiency increases from 7.2% to above 8.7% as a result of the coarsening of the phase domains. This coarsening process is assisted by thermal annealing and the slow evaporation of 1,8-diiodooctane, which we suggest, acts as a plasticiser to promote molecular mobility. Our results show that 1,8-diiodooctane can be completely removed from the film by a thermal annealing process at temperatures \u2264100\u2009\u00b0C and that there is an interplay between the evaporation rate of 1,8-diiodooctane and the rate of domain coarsening in the plasticized film which helps elucidate the mechanism by which additives improve device efficiency.<\/jats:p>","DOI":"10.1038\/srep44269","type":"journal-article","created":{"date-parts":[[2017,3,13]],"date-time":"2017-03-13T11:45:57Z","timestamp":1489405557000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":57,"title":["Understanding and controlling morphology evolution via DIO plasticization in PffBT4T-2OD\/PC71BM devices"],"prefix":"10.1038","volume":"7","author":[{"given":"Yiwei","family":"Zhang","sequence":"first","affiliation":[]},{"given":"Andrew J.","family":"Parnell","sequence":"additional","affiliation":[]},{"given":"Fabio","family":"Pontecchiani","sequence":"additional","affiliation":[]},{"given":"Joshaniel F. 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