Enhanced Solid-State Order and Field-Effect Hole Mobility through Control of Nanoscale Polymer Aggregation

被引:203
作者
Chen, Mark S. [1 ,4 ]
Lee, Olivia P. [1 ,4 ]
Niskala, Jeremy R. [1 ,4 ]
Yiu, Alan T. [2 ,4 ]
Tassone, Christopher J. [6 ]
Schmidt, Kristin [6 ]
Beaujuge, Pierre M. [7 ]
Onishi, Seita S. [1 ,3 ,4 ,5 ]
Toney, Michael F. [6 ]
Zettl, Alex [3 ,4 ,5 ]
Frechet, Jean M. J. [1 ,2 ,4 ,7 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
[5] Univ Calif Berkeley, Kavli Energy Nanosci Inst, Berkeley, CA 94720 USA
[6] Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA
[7] King Abdullah Univ Sci & Technol, Thuwal 239556900, Saudi Arabia
关键词
DONOR-ACCEPTOR POLYMER; THIN-FILM TRANSISTORS; BAND-GAP POLYMERS; CONJUGATED POLYMER; CHARGE-TRANSPORT; MOLECULAR DESIGN; DIKETOPYRROLOPYRROLE; PERFORMANCE; MORPHOLOGY; COPOLYMER;
D O I
10.1021/ja4088665
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Efficient charge carrier transport in organic field-effect transistors (OFETs) often requires thin films that display long-range order and close pi-pi packing that is oriented in-plane with the substrate. Although some polymers have achieved high field-effect mobility with such solid-state properties, there are currently few general strategies for controlling the orientation of pi-stacking within polymer films. In order to probe structural effects on polymer-packing alignment, furan-containing diketopyrrolopyrrole (DPP) polymers with similar optoelectronic properties were synthesized with either linear hexadecyl or branched 2-butyloctyl side chains. Differences in polymer solubility were observed and attributed to variation in side-chain shape and polymer backbone curvature. Averaged field-effect hole mobilities of the polymers range from 0.19 to 1.82 cm(2)/V.s, where PDPP3F-C16 is the least soluble polymer and provides the highest maximum mobility of 2.25 cm(2)/V.s. Analysis of the films by AFM and GIXD reveal that less soluble polymers with linear side chains exhibit larger crystalline domains, pack considerably more closely, and align with a greater preference for in-plane pi-pi packing. Characterization of the polymer solutions prior to spin-coating shows a correlation between early onset nanoscale aggregation and the formation of films with highly oriented in-plane 7r-stacking. This effect is further observed when nonsolvent is added to PDPP3F-BO solutions to induce aggregation, which results in films with increased nanostructural order, in-plane pi-pi orientation, and field-effect hole mobilities. Since nearly all pi-conjugated materials may be coaxed to aggregate, this strategy for enhancing solid-state properties and OFET performance has applicability to a wide variety of organic electronic materials.
引用
收藏
页码:19229 / 19236
页数:8
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