Electrical properties of electrochemically doped organic semiconductors using light-emitting electrochemical cells
Electrical properties of electrochemically doped organic semiconductors using light-emitting electrochemical cells
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DOI：
10.1007/s10008-016-3219-2
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发表时间：
2016-04
影响因子：
2.5
通讯作者：
G. Gozzi;G. Gozzi;L. D. Cagnani;Roberto Mendonça Faria;L. F. Santos
中科院分区：
文献类型：
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作者：
G. Gozzi;G. Gozzi;L. D. Cagnani;Roberto Mendonça Faria;L. F. Santos
我们提出了一个电化学掺杂的共轭聚合物的电性能的研究，使用聚合物发光电化学电池（PLEC）和解释的结果，根据一个唯象模型（PM），它假设，以上的设备开启电压，掺杂的有机半导体的体传输特性是负责的主要贡献，整个设备的电导率。为了证实该模型的预测，PLEC的电导率与不同的参数的依赖性进行评估，并与预期的掺杂的半导体聚合物材料的行为进行比较。有机半导体掺杂水平、有机半导体分子的共混物浓度、器件厚度、电荷载流子迁移率和温度是变化的参数以进行该分析。我们观察到，器件的电导率是独立的有源层的厚度，弱依赖于温度，但强烈依赖于半导体掺杂水平，在混合物中的半导体分数，和本征载流子迁移率。这些结果很好地描述了可变范围跳跃（弗赫）模型，已被广泛用于描述掺杂半导体聚合物材料中的电荷输运，证实了唯象模型的预测。目前的分析表明，PLEC是一个合适的系统，用于研究，在原位，半导体聚合物的电化学掺杂，允许材料性能的评估，例如，电子电荷载流子的密度（和，因此，离子电荷载流子浓度），以实现最大的电化学掺杂水平的有机半导体。
We present a study of the electrical properties of electrochemically doped conjugated polymers using polymeric light-emitting electrochemical cells (PLECs) and interpreting the results according to a phenomenological model (PM) which assumes that, above the device turn-on voltage, the bulk transport properties of the doped organic semiconductor are responsible for the main contribution to the whole device conductivity. To confirm the predictions of this model, the dependence of the conductivity of PLECs with different parameters is evaluated and compared with the behavior expected for a doped semiconducting polymeric material. The organic semiconductor doping level, the blend concentration of organic semiconducting molecules, the device thickness, the charge carrier mobility, and the temperature are the parameters varied to perform this analysis. We observed that the device conductivity is independent of the active layer thickness, weakly dependent on the temperature, but strongly dependent on the semiconductor doping level, on the semiconductor fraction in the blend, and on the intrinsic charge carrier mobility. These results were well described by the variable range hopping (VRH) model, which has been widely employed to describe the charge transport in doped semiconducting polymeric materials, confirming the prediction of the phenomenological model. The current analysis demonstrates that PLECs are a suitable system for studying, in situ, the electrochemical doping of semiconducting polymers, permitting the evaluation of material properties as, for instance, the density of electronic charge carriers (and, consequently, the ionic charge carrier concentration) necessary to achieve the maximum electrochemical doping level of the organic semiconductor.