Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10156558 | Applied Radiation and Isotopes | 2018 | 14 Pages |
Abstract
This article presents the optimization design and simulation of a betavoltaic battery composed of a silicon p-n junction converter and a titanium tritide film as an isotope source. The self-absorption of β particles emitted from the tritium radioisotope in the titanium tritide film and the energy deposition of β particles in the silicon converter are investigated by the Monte Carlo simulation with the Geant4 radiation transport toolkit. The relationships between doping concentrations and basic parameters such as depletion region width, minority carrier diffusion length and leakage current of the PN junction are discussed through the calculation formulas. By optimizing the doping concentrations in the P-type and N-type regions, the optimized betavoltaic battery can maximize the output power and the conversion efficiency based on the energy deposition in the silicon. The results show that the optimal thickness of the titanium tritide film is about 0.7â¯Âµm and the optimal doping concentrations of the battery with a PN junction depth of 50â¯nm are Na=5.75Ã1019cmâ3,Nd=2.95Ã1018cmâ3. Under these parameters, the size 1mmÃ1mm proposed battery with 2.9âmCi/mm2 3H can achieve the output power 0.902ânW and the conversion efficiency 0.91%. The open circuit voltage, short circuit current and fill factor of the battery are 0.389âV, 3.03ânA and 0.766, respectively.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Meng Wu, Shumin Wang, Yi Ou, Weibing Wang,