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This study focuses on the blend film comprising poly(thieno[3,4-\n                    <jats:italic>b<\/jats:italic>\n                    ]thiophene-\n                    <jats:italic>alt<\/jats:italic>\n                    -benzodithiophene) (PTB7) and [6,6]-phenyl-C\n                    <jats:sub>71<\/jats:sub>\n                    -butyric acid methyl ester (PC\n                    <jats:sub>71<\/jats:sub>\n                    BM), exploring how additives like 1,8-diiodooctane (DIO) influence the film structures spin-cast from chlorobenzene solution. Combined results of specular X-ray and neutron reflectivity, grazing-incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS), and X-ray photoelectron spectroscopy indicate that DIO could significantly enhance the dispersion of PC\n                    <jats:sub>71<\/jats:sub>\n                    BM and reduce composition inhomogeneity in the film. Time-resolved GISAXS\u2013GIWAXS with 100\u2005ms resolution further captures a rapid spinodal decomposition of the mixture within 1\u2005s in the constant-evaporation stage of spin-casting. Further combined with parallel analysis of time-resolved UV\u2013Vis reflectance, these findings reveal that DIO mitigates the spinodal decomposition process by accelerating solvent evaporation, which, in turn, decelerates phase segregation, leading to a nucleation-driven process. These observations provide mechanistic insights into the role of additives in controlling the nanostructural evolution of spin-cast films by altering the kinetics of solvent evaporation and phase separation during the spin-coating process.\n                  <\/jats:p>","DOI":"10.1107\/s1600576724010082","type":"journal-article","created":{"date-parts":[[2024,11,4]],"date-time":"2024-11-04T07:59:26Z","timestamp":1730707166000},"page":"1871-1883","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Modulating phase segregation during spin-casting of fullerene-based polymer solar-cell thin films upon minor addition of a high-boiling co-solvent"],"prefix":"10.1107","volume":"57","author":[{"given":"Kuan-Hsun","family":"Lu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00zdnkx70","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemical Engineering"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei-Ru","family":"Wu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00k575643","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun-Jen","family":"Su","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00k575643","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2366-1808","authenticated-orcid":true,"given":"Po-Wei","family":"Yang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00k575643","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8370-4526","authenticated-orcid":true,"given":"Norifumi L.","family":"Yamada","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01g5y5k24","id-type":"ROR","asserted-by":"publisher"}],"department":["Institute of Materials Structure Science"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong-Jun","family":"Zhuo","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00zdnkx70","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemical Engineering"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Show-An","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00zdnkx70","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemical Engineering"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9000-2194","authenticated-orcid":true,"given":"Wei-Tsung","family":"Chuang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00k575643","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1033-3637","authenticated-orcid":true,"given":"Yi-Kang","family":"Lan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/034ezwg26","id-type":"ROR","asserted-by":"publisher"}],"department":["Materials and Electro-Optic Research Division"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"An-Chung","family":"Su","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00zdnkx70","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemical Engineering"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2247-5061","authenticated-orcid":true,"given":"U-Ser","family":"Jeng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00zdnkx70","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemical Engineering"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2024,11,17]]},"reference":[{"key":"jl5094_bb1","doi-asserted-by":"crossref","first-page":"929","DOI":"10.1107\/S0021889810020352","volume":"43","author":"Babonneau","year":"2010","journal-title":"J. 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