温度相关的聚四噻吩（PQT）结构与电性能之间的复杂相互关系,The Journal of Physical Chemistry C

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温度相关的聚四噻吩（PQT）结构与电性能之间的复杂相互关系
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-10-09 00:00:00 , DOI: 10.1021/acs.jpcc.7b02489
S. Grigorian _{1,

2} , S. Escoubas ₂ , D. Ksenzov ₁ , D. Duche ₂ , M. Aliouat ₂ , J.-J. Simon ₂ , B. Bat-Erdene ₁ , S. Allard ₃ , U. Scherf ₃ , U. Pietsch ₁ , O. Thomas ₂

Affiliation

研究了退火温度对共轭聚十二烷基-四噻吩（PQT-12）聚合物薄膜的结构和电性能的影响。温度引起的结构参数变化通过原位掠入射X射线衍射（GIXD）和电导率进行监测。通过使用可变角度光谱椭圆偏光法（VASE）进行介电性能研究，对它们进行了补充。在逐步加热到90°C的第一个热循环中，观察到了散射强度，晶畴尺寸和电流响应的增加，这揭示了PQT-12中两个相互交叉程度不同的多晶型物。在第二个循环中观察到不可逆的变化，具有高达140°C的较高热预算，并且与主要PQT-12形式从高度有序到粉末状无序相的过渡有关，而具有更强互指性的第二个多晶型物则完全消失了。与这些观察结果一致，高温VASE研究表明，由于骨架扭曲和扭转的增加，过渡的蓝移以及共轭长度的减少。结合的GIXD，VASE和电特性表明，PQT-12在两个多晶型物之间表现出复杂的相互作用，这对电荷载流子传输有很大影响，具体取决于所采用的热预算。与这些观察结果一致，高温VASE研究表明，由于骨架扭曲和扭转的增加，过渡的蓝移以及共轭长度的减少。结合的GIXD，VASE和电特性表明，PQT-12在两个多晶型物之间表现出复杂的相互作用，这对电荷载流子传输有很大影响，具体取决于所采用的热预算。与这些观察结果一致，高温VASE研究表明，由于骨架扭曲和扭转的增加，过渡的蓝移以及共轭长度的减少。结合的GIXD，VASE和电特性表明，PQT-12在两个多晶型物之间表现出复杂的相互作用，这对电荷载流子传输有很大影响，具体取决于所采用的热预算。

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A Complex Interrelationship between Temperature-Dependent Polyquaterthiophene (PQT) Structural and Electrical Properties

The influence of annealing temperature on the structural and electrical properties of conjugated poly(dodecyl-quaterthiophene) (PQT-12) polymer films is exploited. The temperature induced changes of structural parameters are monitored by in situ grazing incident X-ray diffraction (GIXD) and the conductivity. They are complemented by studies of the dielectric properties using variable angle spectroscopic ellipsometry (VASE). An increase of the scattered intensity, the size of the crystalline domains, and the current response is observed for a first thermal cycle with stepwise heating up to 90 °C, which revealed two polymorphs with different degrees of interdigitation in PQT-12. Irreversible changes are observed for the second cycle with a higher thermal budget up to 140 °C and are connected with a transition from the highly ordered to powder-like disordered phase for the main PQT-12 form whereas the second polymorph with stronger interdigitation completely vanished. In agreement with these observations high-temperature VASE studies demonstrated a blue shift of the transitions with a reduction in the conjugation length caused by an increase in the twist and torsion of the backbone. Combined GIXD, VASE, and electrical characterizations show that PQT-12 exhibits a complex interplay between two polymorphs with a strong influence on the charge carrier transport depending on the thermal budget employed.

更新日期：2017-10-10

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