Summary: The fabrication of organic crystals into useful forms might play an important role in future electronics technology. A method for fabricating organic crystal rings has been developed. The self‐assembly of six‐armed poly(methyl methacrylate) with a triphenylene core leads to the formation of pores homogeneously distributed in the polymer film. Because the solubility of this polymer in tetrahydrofuran (THF) is lower than that of 2,3,6,7,10,11‐hexamethacrylate triphenylene (HMTP), the holes initially formed and distributed in the polymer film are filled with a THF solution of HMTP. Crystallization nucleation occurs at the edge of holes and HMPT crystals grow at the contact line to form organic crystal rings.
