Characterization of tin(II) sulfide defects/vacancies and correlation with their photocurrent

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• 作者：Mingyang Liu ; Luqing Wang ; Linan Zhou ; Sidong Lei ; Jarin Joyner…
• 关键词：SnS microspheres ; mesoporous nanosheet assembly ; defects/vacancies ; positron annihilation spectrometry ; photocurrent
• 刊名：Nano Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：10
• 期：1
• 页码：218-228
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanotechnology; Materials Science, general; Atomic/Molecular Structure and Spectra; Condensed Matter Physics; Biotechnology; Biomedicine, general;
• 出版者：Tsinghua University Press
• ISSN：1998-0000
• 卷排序：10

文摘

The presence of defects/vacancies in nanomaterials influences the electronic structure of materials, and thus, it is necessary to study the correlation between the optoelectronic properties of a nanomaterial and its defects/vacancies. Herein, we report a facile solvothermal route to synthesize three-dimensional (3D) SnS nanostructures formed by {131} faceted nanosheet assembly. The 3D SnS nanostructures were calcined at temperatures of 350, 400, and 450 °C and used as counter electrodes, before their photocurrent properties were investigated. First principle computation revealed the photocurrent properties depend on the defect/vacancy concentration within the samples. It is very interesting that characterization with positron annihilation spectrometry confirmed that the density of defects/vacancies increased with the calcination temperature, and a maximum photocurrent was realized after treatment at 400 °C. Further, the defect/vacancy density decreased when the calcination temperature reached 450 °C as the higher calcination temperature enlarged the mesopores and densified the pore walls, which led to a lower photocurrent value at 450 °C than at 400 °C.