CVD diamond foils for thermoelectric applications

Doping and varying the grain sizes via manipulation of CVD process parameters allow the production of diamond foils with application specific properties. On the one hand, micro crystalline diamond foils with a very high heat conductivity (around 2000 W/mK)  and a very low electrical conductivity can be produced, while on the other hand boron doped (p-conduction) diamond foils  with corresponding micro and nano grain sizes can have electrical conductivities of up to 40.000 S/m and a thermal conductivity of significantly less than 100 W/mK.

It was already possible to measure Seebeck coefficients above 350 µV/K. These completely different diamond foils are being further developed to improve thermoelectrical properties.

The doping of Titanium and Vanadium for the n-conduction of diamond is another topic of research.

• Haase A., Peters A., Rosiwal S.:
  Growth and thermoelectric properties of nitrogen-doped diamond/graphite
  In: Diamond and Related Materials 63 (2016), p. 222-226
  ISSN: 0925-9635
  DOI: 10.1016/j.diamond.2015.10.023
• Fecher J., Wormser M., Rosiwal S.:
  Long term oxidation behavior of micro- and nano-crystalline CVD diamond foils
  In: Diamond and Related Materials 61 (2016), p. 41-45
  ISSN: 0925-9635
  DOI: 10.1016/j.diamond.2015.11.009
• Engenhorst M., Fecher J., Notthoff C., Schierning G., Schmechel R., Rosiwal S.:
  Thermoelectric transport properties of boron-doped nanocrystalline diamond foils
  In: Carbon 81 (2015), p. 650-662
  ISSN: 0008-6223
  DOI: 10.1016/j.carbon.2014.10.002
• Sobolewski S., Lodes M., Rosiwal S., Singer R.:
  Surface energy of growth and seeding side of free standing nanocrystalline diamond foils
  In: Surface & Coatings Technology 232 (2013), p. 640-644
  ISSN: 0257-8972
  DOI: 10.1016/j.surfcoat.2013.06.051
• Altes A., Heiderhoff R., Balk LJ., Jentsch HG., Rosiwal S.:
  Comparison of thermal conductivities on abraded and untreated CVD-Diamond obtained by scanning thermal microscopy
  In: International Journal of Modern Physics B 16 (2002), p. 922-926
  ISSN: 0217-9792
  URL: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0037139065&origin=inward
• Jentsch HG., Eibisch H., Rosiwal S., Singer R.:
  High growth rate and high quality CVD diamond growth
  Applied Diamond Coating / Frontier Carbon Technology (Auburn)