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However, the structure\u2010property relationship and underlying thermal transport physics remain largely unexplored. Herein, thermal conductivities of 11 representative polymer semiconductors were measured using an improved suspended\u20113\n                    <jats:italic>\u03c9<\/jats:italic>\n                    technique, revealing a strong correlation between thermal conductivity and the paracrystalline disorder of lamellar packing. It is observed that the in\u2011plane intrinsic thermal conductivity of polymer semiconductor films is predominantly controlled by lamellar paracrystallinity, rather than backbone chemistry or \u03c0\u2013\u03c0 stacking. Tuning lamellar paracrystallinity within the same polymer modulated thermal conductivity by up to \u223c40%. Our work shows that lamellar packing is the primary interchain thermal transport pathway, with more efficient vibrational coupling than \u03c0\u2013\u03c0 stacking as evidenced by molecular dynamics simulations. This physical picture reveals distinct interchain pathways for charge and thermal transport in polymer semiconductors, providing guidelines for manipulating thermal conductivity without affecting electrical performance in advanced organic materials and devices.\n                  <\/jats:p>","DOI":"10.1002\/adma.73680","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T08:15:25Z","timestamp":1781165725000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Lamellar\u2010Paracrystallinity\u2010Controlled Thermal Transport in Polymer Semiconductors"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4096-5715","authenticated-orcid":false,"given":"Nai\u2010Fu","family":"Liu","sequence":"first","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences (BNLMS) Center of Soft Matter Science and Engineering Key Laboratory of Polymer 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