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碲化铋基合金的本征点缺陷调控及其热电性能优化

批准号51701126 学科分类金属能源和环境材料 ( E010504 )
项目负责人胡利鹏 负责人职称博士后 依托单位深圳大学
资助金额25.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词能量转换材料;热电材料;碲化铋;本征点缺陷;类施主效应
英文主题词Energy conversion material;thermoelectric materials;bismuth telluride;intrinsic point defects;donor-like effect

摘要

中文摘要 使互相关联的热电参数去耦合化是块体热电材料性能获得突破的有效途径。本征点缺陷广泛存在于热电材料中,且对载流子和声子输运过程的影响相对独立。因而,本项目提出本征点缺陷工程以同时优化材料的电学和热学性能,并选择具有典型晶体结构和重要应用背景的碲化铋基合金为研究对象来表明这种新策略的有效性。本项目拟通过多种先进表征手段研究不同基体成分、不同晶体结构下点缺陷的类型、数量及分布特征,阐明点缺陷的形成演变机制;研究多元化、非名义化学计量比成分设计及外来掺杂元素对点缺陷的影响,开发点缺陷的化学调控技术;研究球磨、热变形等制备工艺对类施主效应的影响,开发点缺陷的机械调控技术;研究退火等后续热处理对类施主缺陷的影响,开发点缺陷的热调控技术;揭示点缺陷对载流子和声子输运的作用机制,探索电声输运协同优化和热电性能突破的途径。本项目的研究对本征点缺陷工程在其他热电材料及功能材料中的应用具有重要意义。
英文摘要 Decoupling of interdependent thermoelectric parameters is considered as an effective way to enhance the thermoelectric performance of bulk thermoelectric materials. Intrinsic point defects widely exist in thermoelectric materials and play relatively independent impact on the carrier and phonon transport. Herein, intrinsic point defect engineering is introduced to simultaneously optimize the electrical and thermal properties of thermoelectric materials, and the bismuth telluride based alloys, which have the typical crystal structure and important application background, are selected as the research object to demonstrate the applicability of this new approach. Through studying the type, quantity and distribution characteristics of point defects based on different matrix composition and crystal structure by advanced characterization methods, the formation mechanism of point defects will be clarified. The influence of multicomponent alloy, nominal stoichiometric ratio and doping elements on the point defects will be studied in order to develop the chemical modulation technology. The influence of preparation technology, including ball milling and hot deformation, on the donor-like effect will be studied in order to develop the mechanical modulation technology. The influence of subsequent heat treatment such as annealing on the donor-like defects will be studied in order to develop the thermal modulation technology. The proposed investigation is aimed at revealing the mechanism of action of point defects on the carrier and phonon transport, exploring the possibility of simultaneous optimization of electrical and thermal properties and thermoelectric performance breakthrough. This research has important implications for the application of intrinsic point defects engineering in other thermoelectric materials and function materials.
结题摘要

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