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New thin and soft semiconductor materials

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2019-04-16 13:55:00

New thin and soft semiconductor materials can be used to make micro nano optoelectronic devices

It has soft properties, only a few nanometers in thickness and good optical properties The reporter learned from Nanjing University of technology on March 3 that the research group of Professor Wang Lin of Nanjing University of technology has prepared a kind of ultra-thin high-quality two-dimensional lead iodide crystal, and has realized the control of optical properties of two-dimensional transition metal sulfide materials through it, which provides a new idea for manufacturing solar cells and photodetectors. The results were published in the latest international journal advanced materials.

"This ultra-thin PbI2 nanosheet, which we have prepared for the first time, is a kind of ultra-thin semiconductor material with a thickness of only a few nanometers, which is called" atomic thickness wide band gap two-dimensional PbI2 crystal " Sun Yan, the first author of the paper and doctoral candidate of Nanjing University of technology, said that they used the solution method to synthesize. This method has the advantages of low equipment requirements, simple, fast and efficient, and can meet the requirements of large area and high-yield material preparation. The results show that the lead iodide nanosheets have regular triangular or hexagonal shape, the average size is 6 μ m, the surface is smooth and smooth, and the optical properties are good.

Researchers combined the ultrathin PbI2 nanosheets with two-dimensional transition metal sulfides, designed them artificially, stacked them together to obtain different types of heterojunctions. Because the energy levels are arranged differently, lead iodide can have different effects on the optical performance of different two-dimensional transition metal sulfides. This energy band structure can effectively improve the luminous efficiency, which is conducive to the production of devices such as LED and laser, which can be used in display and lighting, and can be used in the fields of photodetectors, photovoltaic devices and so on.

Compared with the traditional optoelectronic devices based on silicon-based materials, this achievement has the characteristics of flexibility and micro nano. Therefore, it can be applied in the preparation of flexible and integrated optoelectronic devices. The two-dimensional semiconductor heterostructure based on lead iodide nanosheets can be used in integrated micro nano devices The field of optoelectronic devices has a broad application prospect, which provides a new idea for manufacturing solar cells, photodetectors and so on.

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