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理学院数学物理进展论坛——Chalcogenides Materials for Thermoele

更新日期:2016-09-28 作者:马崇庚 浏览次数:2416


报告题目:Chalcogenides Materials for Thermoelectricity, Solar Cells and Radiation Detectors

报告人:Michal Piasecki,教授(博士),波兰琴斯托霍瓦师范大学

报告时间:2016929日上午1000

报告地点:理学院三楼会议室

 

报告摘要:

        Chalcogenides compounds  (CGC)  form a very large and versatile group of materials, in which one can distinguish between the mono-, di-, and tri-chalcogenides. In these compounds all ions are four-fold coordinated; the chemical bonds between them are usually strongly covalent. The crystal structure of the chalcogenide compounds offers a possibility for partial or complete substitution of cation or anion groups, i.e. formation of solid solutions, whose properties can be significantly different from those of pure compounds. The crystal structure of chalcogenides depends on their composition and can be cubic (CdS), trigonal (CdI2) etc. CGC are widely used for solar cell, radiation detectors and thermoelectric applications, since they can be grown in the form of thin films. The I-III-VI2 ternary semiconductors with the chalcopyrite structure (e.g. CuGaS2, CuInS2 etc.) have been shown as very suitable materials for the solar panels, since they can be grown as thin films which efficiently increases the surface exposed to sunlight. Moreover, the Cu(In,Ga)(Se,S)2 - based solar elements already challenge the dominance of the traditional silicon solar panels. The band structure parameters of these materials are influenced by intrinsic defects forming the additional trapping levels within the host’s band gap. Such defects can significantly change the optical properties of a material, considerably enhance its optical absorption and, therefore, they play a principal role for the optoelectronic and photovoltaic applications. The complex approach, which includes theoretical analysis based on the DFT methods supported by the optical experimental studies of the absorption near the band gap spectral range, is a very powerful tool for predicting the optoelectronic features of the materials used for the solar panels. It also allows for modelling the defects properties and their influence on the host’s properties .

 Nowadays considerable progress has been achieved in the development of experimental methods of the CGC production. At the same time, very rapid advances in reliable computational DFT-based methods have paved a broad way towards increasing importance of so-called “theoretical experiments”, when thoroughly performed calculations replace or forego experiments and even predict unknown materials and their properties. Such “theoretical experiments” are relatively cost less, if compared to the real laboratory activities; however, the results of such calculations serve as extremely useful guides for setting up a proper direction in search for new efficient materials.

 

报告人简介

    演讲人Michal Piasecki教授是波兰琴斯托霍瓦师范大学物理所的负责人,也是该校校长亲自授权的官方访问代表。其1990年博士毕业于波兰科学院物理所,自2008年以来共计在Inorganic Chemistry等国际知名杂志发表115SCI论文,H指数为19,论文引用近1500次,共主持波兰和欧盟的科研基金项目10余项,在各类国际大会做邀请报告近20余次,荣获波兰科学和高等教育部科技奖励1项。他的研究兴趣主要集中在光谱物理学、基础固态物理学、新型功能材料等。本次访问旨在加强两校之间的专业合作办学和科学联合研究等,因而报告内容也将介绍波兰高等教育和科研以及留学生招收等情况。

 

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