Dopant-Induced Ordering of Amorphous Regions in Regiorandom P3HT.
Dopant-Induced Ordering of Amorphous Regions in Regiorandom P3HT.
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DOI：
10.1021/acs.jpclett.9b02070
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发表时间：
2019-08
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影响因子：
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通讯作者：
Patrick Y. Yee;D. T. Scholes;Benjamin J. Schwartz;Sarah H. Tolbert
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文献类型：
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作者：
Patrick Y. Yee;D. T. Scholes;Benjamin J. Schwartz;Sarah H. Tolbert
尽管半导体聚合物的分子掺杂已经成为改善有机电子器件性能的有价值的策略，但基本的掺杂剂-聚合物相互作用尚未完全理解。本文利用二维掠入射广角X射线散射（GIWAXS）研究了在无定形共轭聚合物中加入氧化性小分子掺杂剂，如2，3，5，6-四氟-7，7，8，8-四氰基醌二甲烷（F4 TCNQ）和FeCl 3，（3-己基噻吩-2，5-二基）（RRa-P3 HT），提高聚合物的有序性，并诱导畴取向从各向同性到大部分边缘上的变化。P3 HT的行为类似于更有序的区域规则P3 HT。通过比较F4 TNCQ和FeCl 3掺杂的RRa-P3 HT薄膜和体积与F4 TCNQ相似但未掺杂RRa-P3 HT的7，7，8，8-四氰基醌二甲烷（TCNQ）渗透的RRa-P3 HT薄膜的光学、电学和结构性质，我们表明，增加的有序性不是由于掺杂剂填充空间的能力，而是由于需要在聚合物上离域电荷，一维空间
Despite the fact that molecular doping of semiconducting polymers has emerged as a valuable strategy for improving the performance of organic electronic devices, the fundamental dopant-polymer interactions are not fully understood. Here we use 2-D grazing incidence wide-angle X-ray scattering (GIWAXS) to demonstrate that adding oxidizing small-molecule dopants, such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and FeCl3, into the amorphous conjugated polymer, regiorandom poly-(3-hexylthiophene-2,5-diyl) (RRa-P3HT), improves polymer ordering and induces a change in domain orientation from isotropic to mostly edge-on. Doping thus causing RRa-P3HT to behavior similarly to the more ordered regioregular P3HT. By comparing the optical, electrical and structural properties of RRa-P3HT films doped with F4TNCQ and FeCl3 and those infiltrated with 7,7,8,8-tetracyanoquinodimethane (TCNQ), which occupies a similar volume as F4TCNQ but does not dope RRa-P3HT, we show that the increased ordering results not from the ability of the dopant to fill space but instead from the need to delocalize charge on the polymer in more than one dimension.