First Simulations on Higher-Efficiency Betavoltaic Battery Integrated with Electrets for Space, Medicine and Remote Sensing Applications

The results of Geant4 simulations using Montecarlo based code to explore suitable beta emitters and the interaction of beta rays with matter for the development of nuclear betavoltaic battery are shown. Such developments arise from the need of reliable, long-lived, high energy-density power sources for operating electrical systems in hostile and inaccessible environments, at variance with conventional electrochemical batteries with limited longevity and a strong tendency to degrade under extreme environmental conditions. The choice of beta emitters is due to the higher energy conversion efficiency and security when compared with other types of nuclear batteries. The geometrical efficiency of beta-particles interaction with different type of semiconductors is investigated.