导电聚合物P3MT的光调制反射谱

本文报道了导电聚合物光调制反射光谱的研究工作。实验观察到聚三甲基噻吩的带间跃迁和与双极化子态有关的跃迁,并且观察了谱结构随掺杂浓度、温度以及调制光强度的变化。实验结果证明,光子能量大于禁带宽度E_g的光可在聚合物分子链中诱导产生双极化子。虽然双极化子可以由光诱导产生,也可以由杂质诱导产生,但它本身是不依赖于诱导方式的聚合物分子链的本征元激发态。荷电的双极化子可受离化杂质的库仑吸引,产生钉扎效应,并使禁闭参数变大。 关键词：

PHOTOREFLECTANCE SPECTRA FOR CONDUCTING POLYMER P3MT

We report here the photoreflectance spectra of the conducting polymer. The interband transition and the transition associated with bipolaron have been observed for the poly (3-mythyl thiophene)-P3MT with different doping densities and under different temperatures, different intensities of modulation light. It was also demonstrated experimentally that the bipolaron may be induced by light with photon energy larger than the band gap E_g of the material, the bipolaron is the intrinsic elementary excitation state which is independent on the way of inducement ( photoinduced or doping-induced); bipolaron may be pinned by ionized impurity and then the confinement parameter will be increased.