Abstract In this paper we report the photophysical and electrical characteristics of our synthesized imidazole derivative namely l-alkyl-2-(arylazo) imidazole (AAI) organized in Langmuir-Blodgett (LB) films towards the development of organic Schottky barrier diode (SBD). Presence of long alkyl chain in the molecule make it suitable for LB technology and may favour aggregations of the molecules in LB films under barrier compression. The interfacial properties of the formation of Langmuir monolayer of AAI at air-water interface have been studied by surface pressure versus area per molecule (π-A) isotherm and compressibility modulus. Hysteresis study of the isotherm confirmed the formation of stable monolayer of AAI molecular assemblies at air-water interface. The aggregation of AAI molecules in LB films is confirmed by Ultraviolet–visible (UV–vis) absorption, fluorescence emission spectroscopy and Atomic force microscopic (AFM) methods. AAI molecules also formed network type morphology in LB films due to their closure association and aggregations or cluster of molecules which were evidenced by AFM technique. The compression induced aggregations of AAI is reflected as broadened nature of monomeric absorption band along with the emergence of a new absorption band at longer wavelength side for LB film deposited at surface pressure of 25 mN/m. The optical absorption bands of AAI and the corresponding transitions between different electronic states have been simulated by density functional theoretical (DFT) analysis and is compared with the experimental results. Nonlinear behaviour of the current-voltage characteristics and various relevant electrical parameters of the LB film device at the interface of metal electrode (gold) satisfy the necessary conditions showing the properties of a Schottky barrier diode.

中文翻译：

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利用朗缪尔-布洛杰特技术制备的 1-烷基-2-（芳基偶氮）咪唑分子网络开发肖特基势垒二极管

摘要 在本文中，我们报告了我们合成的咪唑衍生物，即在 Langmuir-Blodgett (LB) 薄膜中组织的 l-烷基-2-(芳基偶氮) 咪唑 (AAI) 的光物理和电学特性，以发展有机肖特基势垒二极管 (SBD) . 分子中长烷基链的存在使其适用于 LB 技术，并可能有利于 LB 膜中分子在屏障压缩下的聚集。已通过表面压力与每分子面积 (π-A) 等温线和压缩模量的关系研究了在空气-水界面形成 AAI 的朗缪尔单层的界面性质。等温线的滞后研究证实了在空气-水界面形成了稳定的 AAI 分子组装单层。通过紫外-可见（UV-vis）吸收、荧光发射光谱和原子力显微镜（AFM）方法证实了 AAI 分子在 LB 薄膜中的聚集。AAI 分子在 LB 薄膜中也形成了网络型形态，这是由于它们的闭合缔合和聚集或分子簇，AFM 技术证明了这一点。AAI 的压缩诱导聚集反映为单体吸收带的加宽性质以及在 25 mN/m 表面压力下沉积的 LB 膜在较长波长侧出现新的吸收带。通过密度泛函理论（DFT）分析模拟了 AAI 的光吸收带和不同电子态之间的相应跃迁，并与实验结果进行了比较。