Enhancement of Ni-63 planar source efficiency for betavoltaic batteries


Belghachı A., Bozkurt K. , Özdemir O. , Avcı Ö.

Journal Of Physics D-Applied Physics, vol.445501, no.53, pp.1-10, 2020 (Journal Indexed in SCI)

  • Publication Type: Article / Article
  • Volume: 445501 Issue: 53
  • Publication Date: 2020
  • Doi Number: 10.1088/1361-6463/ab9977
  • Title of Journal : Journal Of Physics D-Applied Physics
  • Page Numbers: pp.1-10

Abstract

Source efficiency in planar betavoltaic batteries is drastically reduced by self-absorption and directional loss. In this paper, we present a technique of improving source efficiency by the use of beta particles reflectors based on metals. A metallic layer with a high atomic number is an effective electron reflector, capable of reflecting up to 50% of the escaping energy from the backside of a source and they are more efficient for thinner radioactive layers. The obtained results show that the design of separate planar one-sided sources with electron reflectors could be optimized to reach high efficiency before assembly with semiconductor converters. Using Pb reflector for a 200 nm thick Ni-63 source 38.5% of directional lost energy could be recovered. They can lead to a cost-effective technology compared to sandwiched, porous, or three-dimension microstructure designs.