Manufacturing and Characterisation of a Thermoelectric Materials based on Boron Doped Nanocrystalline Diamond Foils

基于硼掺杂纳米晶金刚石箔的热电材料的制造和表征

• 批准号: 240588225
• 负责人: Professor Dr.-Ing. Stefan Rosiwal
• 金额: --
• 依托单位: Department Werkstoffwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/240588225?language=en
• 关键词: Manufacturing; Characterisation; Thermoelectric; Materials; based

Thermoelectric generators (TEG) based on the Seebeck Effect can directly produce electrical current from the waste heat generated by cars or power plants for instance. The established TEG materials currently enable no economical use due to its toxicity, its rare availability (Bismuth- and Lead Tellurides) or its low efficiency (Silicon Germanium).Single crystalline and microcrystalline diamond have a very high thermal conductivity (ca. 2000W/mK) and a very low electrical conductivity, therefore diamond seems to be unsuitable as thermoelectric material. Nanocrystalline diamond foils can be produced by chemical vapour deposition of boron doped diamond on temperature stable templates. After deposition a controlled delamination of the complete nanodiamond layer as nanodiamond foil is possible. It is a promising thermoelectric material, due to its good electrical conductivity and low thermal conductivity (ca. 2 W/mK). Nano diamond is very stable at elevated temperatures (ca. 600°C in air, ca. 1100°C without oxygen). These properties should enable high thermoelectric efficiencies (ZT- value > 2-3). In this project we want to produce boron-dope Nanocrystalline diamond foils with by variation of the HF-CVD process parameters (pressure, methane content, boron content, coating temperature). The thermoelectric properties (Seebeck coefficient, thermal and electrical conductivity) will be measured. Furthermore a thermoelectric generator should be built and characterized by using the new boron-doped foils (p-conductivity) and "poor" (low effiency) N-doped carbon foils (n-conductivity).

基于塞贝克效应的热电发电机（TEG）可以直接从例如汽车或发电厂产生的废热产生电流。现有的TEG材料由于其毒性、其稀有的可用性（碲化铋和碲化铅）或其低效率（硅锗）而目前不能经济地使用。2000 W/mK）和非常低的电导率，因此金刚石似乎不适合作为热电材料。纳米晶金刚石箔可以通过在温度稳定的模板上化学气相沉积掺硼金刚石来制备。在沉积之后，作为纳米金刚石箔的完整纳米金刚石层的受控分层是可能的。它是一种很有前途的热电材料，由于其良好的导电性和低的导热性（约100 ℃）。2 W/mK）。纳米金刚石在高温下非常稳定（约200 ℃）。600°C在空气中，约。1100°C无氧）。这些性质应能够实现高热电效率（ZT值> 2-3）。在这个项目中，我们希望通过改变HF-CVD工艺参数（压力，甲烷含量，硼含量，涂层温度）来生产掺硼纳米晶金刚石箔。将测量热电性能（塞贝克系数、导热性和导电性）。此外，热电发电机应该通过使用新的硼掺杂箔（p-导电性）和“差”（低效率）的N-掺杂碳箔（n-导电性）来构建和表征。