Abstract—Two approaches are used to form organic photosensitive structures. In the first of these, layered photoactive elements are created, in which active layers are deposited successively and have a sharp heterointerface. The second approach is employed in this study, which is based on the formation of a distributed (bulk) heterojunction between a metal phthalocyanine and fullerene in organic photosensitive structures. The influence exerted by the parameters with which the phthalocyanine:fullerene nanocomposite layer is formed on the optical and photoelectric characteristics of FTO/ZnPc:C60/C60/Al and FTO/ZnPc:C60/C60/BPhen/Al structures is considered. The samples under study are created by the method of thermal deposition in vacuum. In the experiment, four types of structures with different compositions of the active layers are fabricated. The configuration of the active layers is changed by varying the mass of the substance being evaporated. For the layer based on zinc phthalocyanine, the influence exerted by the substrate preheating temperature on the quality of the deposited layers is examined. It is found that the optimal temperature at which the layers are uniform and have the strongest absorption is 60°C. The absorption, transmission, and photosensitivity spectra of the samples are examined. The transmission spectra contain two pronounced strong-absorption regions, which correspond to fullerene and zinc phthalocyanine. It is shown that changing the fraction of the fullerene component affects the transport and photoelectric parameters of the nanocomposite layers and structures. The optimum configuration of the active layers is found to be ZnPc:C60/C60. It is shown that the introduction of an additional BPhen layer, which blocks holes and is sufficiently thin for electron transport, makes it possible to significantly raise the photoresponse and extend the sensitivity range of the structure under study.
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The research was carried out within the framework of the project no. 0788-2020-0008, which was carried out within the framework of the state assignment of Ministry of Science and Higher Education of the Russian Federation no. 075-00306-20-01.
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Translated by M. Tagirdzhanov
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Pavlova, M.D., Degterev, A.E., Lamkin, I.A. et al. Influence of the Formation Parameters of Phthalociane:Fullerene Nanocomposite Layer on the Photoelectric Characteristics of ZnPc:C60/C60 Structures. Semiconductors 54, 1800–1804 (2020). https://doi.org/10.1134/S1063782620130114
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DOI: https://doi.org/10.1134/S1063782620130114