Charge mobility enhancement for diketopyrrolopyrrole-based conjugated polymers by partial replacement of branching alkyl chains with linear ones,Materials Chemistry Frontiers

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Charge mobility enhancement for diketopyrrolopyrrole-based conjugated polymers by partial replacement of branching alkyl chains with linear ones
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1039/c7qm00307b
Jing Ma _{1,

2,

3,

4,

5} , Zitong Liu _{1,

2,

3,

4,

5} , Zhijie Wang _{1,

2,

3,

4,

5} , Yizhou Yang _{1,

2,

3,

4,

5} , Guanxin Zhang _{1,

2,

3,

4,

5} , Xisha Zhang _{1,

2,

3,

4,

5} , Deqing Zhang _{1,

2,

3,

4,

5}

Affiliation

Conjugated D–A polymers with high charge mobilities have received increasing attention in recent years. In this paper, we report a simple, but efficient approach to improve the charge mobilities of conjugated polymers by partial replacement of branching alkyl chains with linear ones. With this strategy in mind, we designed and investigated three new DPP-quaterthiophene terpolymers PDPP4T-1, PDPP4T-2 and PDPP4T-3 containing both linear (n-dodecane) and branching (2-decyltetradecyl) alkyl chains with different ratios. On the basis of GIWAXS data, interchain packing order is improved for terpolymers PDPP4T-1, PDPP4T-2 and PDPP4T-3, in comparison with PDPP4T with only branching alkyl chains. The incorporation of linear alkyl chains can affect the interchain packing mode, and PDPP4T-3 with more linear alkyl chains among the three terpolymers adopts the edge-on chain arrangement on the substrate. Field effect transistor measurements indicate that PDPP4T-1, PDPP4T-2 and PDPP4T-3 exhibit higher hole mobilities than PDPP4T. Moreover, the hole mobilities increase in the following order: PDPP4T-1 < PDPP4T-2 < PDPP4T-3 by increasing the content of linear alkyl chains in these terpolymers. The thin film mobility of PDPP4T-3 can reach 6.1 cm² V⁻¹ s⁻¹, which can be further increased to 9.1 cm² V⁻¹ s⁻¹ after incorporating NMe₄I.

中文翻译：

通过用直链部分取代支链烷基链提高二酮吡咯并吡咯基共轭聚合物的电荷迁移率

近年来，具有高电荷迁移率的共轭D–A聚合物受到越来越多的关注。在本文中，我们报告了一种简单而有效的方法，可通过将支链烷基链部分替换为线性烷基链来提高共轭聚合物的电荷迁移率。牢记这一策略，我们设计并研究了三种新型DPP-四噻吩三元共聚物PDPP4T-1，PDPP4T-2和PDPP4T-3，它们同时含有不同比例的直链（正十二烷）和支链（2-癸基十四烷基）烷基链。上GIWAXS数据的基础上，间包装顺序为三元共聚物改进PDPP4T-1 ，PDPP4T-2和PDPP4T-3 ，使用比较PDPP4T仅具有支链烷基链。直链烷基链的掺入会影响链间的堆积方式，并且在三种三元共聚物中具有更多直链烷基链的PDPP4T-3在基材上采用边对边链排列。场效应晶体管的测量结果表明，PDPP4T-1，PDPP4T-2和PDPP4T-3的空穴迁移率高于PDPP4T。而且，空穴迁移率按以下顺序增加：通过增加这些三元共聚物中线性烷基链的含量，PDPP4T-1＜PDPP4T-2＜PDPP4T-3。PDPP4T-3的薄膜迁移率可以达到6.1 cm² V^-1 s^-1，加入NMe ₄ I后可以进一步提高到9.1 cm² V^-1 s^-1。

更新日期：2017-09-20

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