Abstract
Organic–inorganic hetero-multilayer films with good photoconductive properties are expected to be useful in a wide variety of devices, and can be prepared by different techniques. A new organic–inorganic composite CuPc/ZnS (where Pc is phthalocyanine) multilayer film was prepared by vacuum sublimation. The influence of substrate temperature, layer stack number and layer thickness on the structural, optical and photoconductive properties of CuPc/ZnS multilayer films was investigated by atomic force microscopy, X-ray diffraction, infrared absorption, ultraviolet–visible spectroscopy and surface potential decay measurements. It was concluded that the 150 °C-deposited three-pair CuPc/ZnS multilayer with a thickness of 0.1 μm for both CuPc and ZnS layers had the best photoconductive property with a light sensitivity of S = 62.5 lx s under white incident light, and had the ideal multilayer structure with good heterostructural compatibility, interfacial coherence and oriented crystallization, which was preferable for potential applications in photoelectric conversion film-related devices compared with single-layer CuPc films. It was speculated that the charge carrier photogeneration occurred in the CuPc layer, and the ZnS layer provided the role of transportation of electrons in plane after charge separation at interfaces in the CuPc/ZnS multilayer film.
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