Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors
Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors
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DOI：
10.1103/physrevb.95.180201
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发表时间：
2017-05-11
影响因子：
3.7
通讯作者：
Silva, Carlos
中科院分区：
文献类型：
--
作者：
Gregoire, Pascal;Vella, Eleonora;Silva, Carlos
利用二维相干光致发光激发光谱测量并模拟了区域规则聚3-己基噻吩半晶体聚合物的均匀激发线宽。在8K的温度下，我们得到了接近90 meV全宽的半峰值线宽，这是总线宽的一个重要部分。我们将这种均匀展宽解释为链间激子耦合的结果，并在弱耦合聚集模型的背景下对其进行了讨论。
We measure and model the homogeneous excitation linewidth of regioregular poly(3-hexylthiophene), a model semicrystalline polymeric semiconductor, by means of two-dimensional coherent photoluminescence excitation spectroscopy. At a temperature of 8 K, we extract a linewidth of similar to 90 meV full width at half maximum, which is a significant fraction of the total linewidth. We interpret this homogeneous broadening as a consequence of interchain exciton coupling and discuss it within the context of a weakly coupled aggregate model.