首页|Mechanical properties of multi-scale germanium specimens from space solar cells under electron irradiation
Mechanical properties of multi-scale germanium specimens from space solar cells under electron irradiation
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During long-term service in space,Gallium Arsenide(GaAs)solar cells are directly exposed to electron irradiation which usually causes a dramatic decrease in their performance.In the multilayer structure of solar cells,the germanium(Ge)layer occupies the majority of the thick-ness as the substrate.Due to the intrinsic brittleness of semiconductor material,there exist various defects during the preparation and assembly of solar cells,the influences of which tend to be inten-sified by the irradiation effect.In this work,first,Ge specimens for mechanical tests were prepared at scales from microscopic to macroscopic.Then,after different doses of electron irradiation,the mechanical properties of the Ge specimens were investigated.The experimental results demonstrate that electron irradiation has an obvious effect on the mechanical property variation of Ge in diverse scales.The four-point bending test indicates that the elastic modulus,fracture strength,and max-imum displacement of the Ge specimens all increase,and reach the maximum value at the irradia-tion dose of 1 x 1015 e/cm2.The micrometer scale cantilever and nanoindentation tests present similar trends for Ge specimens after irradiation.Atomic Force Microscope(AFM)also observed the change in surface roughness.Finally,a fitting model was established to characterize the relation between modulus change and electron irradiation dose.
Electron irradiationGermaniumMechanical propertiesMulti-scaleSpace solar cells
State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
School of Chemistry and Civil Engineering,Shaoguan University,Shaoguan 512005,China
Key Laboratory of Functional Materials and Devices for Special Environments of Chinese Academy of Sciences,Chinese Academy of Sciences,Urumqi 830011,China
Shanghai Institute of Space Power-Sources,Shanghai 200245,China
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Joint Fund of Advanced Aerospace Manufacturing Technology Research, ChinaResearch Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures, ChinaNational Natural Science Founlotion of China for Creative Research Groups
NETL
NSTL
万方数据
维普
