Nature Chemistry. doi:10.1038/nchem.1628
Authors: John W. Colson & William R. Dichtel
Two-dimensional polymers, which exhibit periodic bonding in two orthogonal directions, offer mechanical, electronic and structural properties distinct from their linear or irregularly crosslinked polymer counterparts. Their potential is largely unexplored because versatile and controlled synthetic strategies are only now emerging. This Review describes recent developments in two-dimensional polymerization methods.
Nature Materials. doi:10.1038/nmat3655
Authors: Neil D. Treat, Jennifer A. Nekuda Malik, Obadiah Reid, Liyang Yu, Christopher G. Shuttle, Garry Rumbles, Craig J. Hawker, Michael L. Chabinyc, Paul Smith & Natalie Stingelin
Additives, including nucleating agents, have been used to regulate the solidification process of (semi-)crystalline polymer solids and thus control both their crystallite dimensions and shape. Here, we demonstrate that minute amounts (0.1–1 wt%) of commercially available nucleating agents can be used to efficiently manipulate the solidification kinetics of a wide range of organic semiconductors—including poly(3-alkylthiophene)s, the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and 6,13-bis(triisopropyl-silylethynyl) (TIPS) pentacene—when processed from the melt, solution or solid state, without adversely affecting the semiconductors’ electronic properties. Heterogeneous nucleation increases the temperature of and rate of crystallization of poly(3-alkylthiophene)s, permits patterning of crystallites at pre-defined locations in PCBM, and minimizes dewetting of films of TIPS-pentacene formed by inkjet printing. Nucleating agents thus make possible the fabrication of thin-film transistors with uniform electrical characteristics at high yield.
Nature Materials. doi:10.1038/nmat3686
Author: Antonio Facchetti
Fabricating thin films of organic semiconductors that have molecular order across large areas has proved challenging. Now, three complementary approaches — molecular design, fluid-flow control and the use of nucleating agents — offer unprecedented opportunities for next-generation optoelectronic applications.
Nature Materials. doi:10.1038/nmat3650
Authors: Ying Diao, Benjamin C-K. Tee, Gaurav Giri, Jie Xu, Do Hwan Kim, Hector A. Becerril, Randall M. Stoltenberg, Tae Hoon Lee, Gi Xue, Stefan C. B. Mannsfeld & Zhenan Bao