Abstract：
The incorporation of heteroatoms in the chemical structure of organic molecules has been identified as analogous to the doping process adopted in silicon semiconductors to influence the nature of charge carriers. This strategy has been an eye-opener for material chemists in synthesizing new materials for optoelectronic applications. Phenanthro[9,10-a]phenazine-based mesogens have been synthesized via a cyclo-condensation pathway involving triphenylene-based diketones and o-phenyl diamines. The incorporation of phenazine moiety as discussed in this paper, alters the symmetric nature of the triphenylene. The phenanthro[9,10-a]phenazine-based mesogens exhibited hole mobility in the order of 10-4 cm2/Vs as measured by the space-charge limited current (SCLC) technique. The current density in SCLC device increases with increasing temperature which indicates that the charge transport is associated with the thermally activated hopping process. This report attempts to elucidate the self-organization of asymmetric phenanthro[9,10-a] phenazine in the supramolecular liquid crystalline state and their potential for the fabrication of high-temperature optoelectronic devices. However, the low charge carrier mobility can be one of the challenges for device performance.
摘要：
已确定在有机分子的化学结构中杂原子的掺入类似于硅半导体中采用的掺杂工艺，以影响电荷载流子的性质。这种策略为材料化学家在合成用于光电应用的新材料方面大开眼界。菲[9,10-a]吩嗪基介晶已通过环缩合途径合成，该途径涉及基于亚苯基的二酮和邻苯基二胺。本文讨论了吩嗪部分的掺入，改变了三亚苯的对称性质。通过空间电荷限制电流（SCLC）技术测量，基于菲[9,10-a]吩嗪的介晶的空穴迁移率约为10-4cm2/Vs。SCLC装置中的电流密度随着温度的增加而增加,这表明电荷传输与热激活跳跃过程相关联。本报告试图阐明超分子液晶态的不对称菲[9,10-a]吩嗪的自组织及其在制造高温光电器件中的潜力。然而,低电荷载流子迁移率可能是器件性能的挑战之一。
