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M. A. Zabolotnyy, M. Yu. Barabash, Ye. M. Boboshko, D. O. Grynko, A. A. Kolesnichenko, R. V. Lytvyn, A. Yu. Sezonenko, T. V. Loskutova, L. ². Àslamova, and N. V. Minitska
Photoconductive Materials for Ordered Nanoobjects Based on Templates
0057–0071 (2023)

PACS numbers: 42.70.Ln, 68.35.bm, 72.40.+w, 73.50.Pz, 78.20.Nv, 82.35.Cd

The purpose of this work is to study the properties of amorphous molecular semiconductors (AMSs), which are used as templates for the development of ordered nanoobjects. Photosensitive AMSs are carbazole-containing compounds for recording optical information in real time. They have high sensitivity and spatial resolution, and can work in automatic mode without an operator. It is important to improve the characteristics of AMSs and modes of their application. When optimizing the composition of AMSs, the most important problem is to find out the mechanisms of thermalization of carriers, the quantum yield in AMSs under photoexcitation, and the electrophysical phenomena. The technique of thermally stimulated depolarization is used for the analysis of these processes. This technique makes it possible to study the kinetics of the electric charge formed due to the orientation of permanent dipoles or the charge trapped by such deep traps as structural defects, impurity centres, charges accumulated at the interphase boundaries in the film. The spectral sensitivity is measured for the samples comprised of thin layers of carbazole-containing materials, which were produced by pouring toluene solutions. As found out, the quantum yield of photogeneration is decreased at higher wavelengths of light. A model based on the assumption of the Newtonian nature of the dependence of the rate of energy loss for a non-equilibrium electron is proposed. Within the framework of this model, the dependences of the length and time of thermalization on the frequency of the exciting light, the temperature of the AMSs, and the parameter determining the rate of loss of excess energy by a non-equilibrium carrier of electric charge are determined. As a result, a phenomenological model of the electrophotographic process is proposed, and the composition of the AMSs is optimized. A template with an area of ≅ 4 cm2 and a spatial period of ≅ 3–1 µm is fabricated.

Key words: amorphous molecular semiconductors, photosensitivity, electrophysical properties, electric charge.

https://doi.org/10.15407/nnn.21.01.057

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