Conjugated Polymer Mesocrystals with Structural and Optoelectronic Coherence and Anisotropy in Three Dimensions

• DOI: 10.1002/adma.202103002
• Publication Date: 2021-10-22T09:40:52Z
• Authors: Liyang Yu; Egon Pavlica; Ruipeng Li; Yufei Zhong; Carlos Silva; Gvido Bratina; Christian Müller; Aram Amassian; Natalie Stingelin
• Keywords: Charge carrier

Semiconducting mesocrystalline bulk polymer specimens that exhibit near-intrinsic properties using channel-die pressing are demonstrated. A predominant edge-on orientation is obtained for poly(3-hexylthiophene-2,5-diyl) (P3HT) throughout 2 mm-thick/wide samples. This persistent arrangement at macroscopic scales allows reliable evaluation of the electronic charge-transport anisotropy along all three crystallographic axes, with high mobilities found π-stacking. Indeed, charge-carrier up to 2.3 cm2 V-1 s-1 measured π-stack, which some highest reported polymers low densities (drop-cast films display maximum ≈10-3 ). The structural coherence also leads an unusually well-defined photoluminescence line-shape characteristic H-aggregate (measured from surface perpendicular materials flow), rather than typical HJ-aggregate feature usually P3HT. approach widely applicable: electrical conductors and used in n-type devices, such as poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (N2200) where structure electron transport backbones (≈1.3 versatility broad applicability signifies its promise a straightforward, readily scalable method fabricate semiconducting structures typically accessible only by tedious growth single crystals.