Optimization Design and Stability Performance on High-Efficiency Betavoltaic Microbatteries for Space Applications  

作　　者：LIU Yunpeng TANG Xiaobin 

机构地区：[1]Department of Nuclear Science and Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China [2]Key Laboratory of Nuclear Technology Application and Radiation Protection in Astronautics,Ministry of Industry and Information Technology,Nanjing 210016,Jiangsu,China

出　　处：《上海航天（中英文）》2020年第S01期62-68,共7页Aerospace Shanghai（Chinese&English）

基　　金：the National Natural Science Foundation of China(11675076);the Shanghai Aerospace Science and Technology Innovation Project(SAST2019-112)

摘　　要：Due to the characteristics such as long-lifetime, high-energy-density, self-sufficient ability, and amenable-to-miniaturization,betavoltaics possess significant potential for next-generation microbatteries in the low consumption devices for space applications. In this paper,we mainly deal with four things. First,the efficiency limits are discussed. Employing63 Ni and147 Pm with different thicknesses and apparent activity densities,we calculate the total efficiency(ηtotal)and conversion efficiency(η)limits of betavoltaics by MCNP5 and the Schottky equation. Second,the structure parameters are optimized. The structure model of63 Ni-Si betavoltaic in micro-nano scale is established. With the consideration of the isotope self-absorption effect,we optimize the structural parameters of betavotaics,e.g.,the thickness of the source and the thickness,the junction depth,and the doping concentration of the energy conversion unit. Third,several betavoltaic battery samples are prepared. The maximum output power density of the interlayer betavoltaics connected in series or parallel is approximate two times that of the single-layer betavoltaic,which verifies that it is feasible to improve the output performance by using the betavoltaic array in series and parallel. Finally,the effects of the environmental factors,including the vacuum degree and the temperature,on the performance of betavoltaics are studied. The encouraging results present important theoretical foundations and technical supports for the performance evaluation,devices design,performance improvement,and stability study of betavoltaics,and make the betavoltaic microbatteries closer to space applications.

关 键 词：EFFICIENCY CLOSER LIFETIME 

分 类 号：V242[航空宇航科学与技术—飞行器设计] V442