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Numerical Simulation of GaAs Solar Cell Aging Under Electron and Proton Irradiation
摘要： Though gallium arsenide (GaAs) solar cells are proven to be relatively stable in space working conditions, they are prone to the effects of aging, which deteriorate their characteristics. The lifetime of solar cells is restricted by the degree of radiation damage that they receive. This important factor affects the performance of solar cells in practical applications. The aim of this article is to investigate by numerical simulation on the influence of aging on the main characteristics of GaAs solar cells in the space. Degradations of the electrical characteristics are simulated for over a period of 15 years. The atmosphere (AM0) conversion efficiency decreases with time from 19.08% for the unirradiated cells to 10.38% in 15 years of the mission in space. Even with low doses of particle irradiation, the performance is significantly reduced subsequent to usage over the period of 15 years of the mission in space. Numerical simulation results also reveal that the short-circuit current, the open-circuit voltage, and the conversion efficiency decline gradually with time. Moreover, the calculated evolutions are in good agreement with the measured behaviors of GaAs-based solar cells embedded in geostationary satellites during the Navigation Technology Satellite 2 (NTS-2), the Engineering Test Satellite V (ETS-V), and the NAVigation Satellite Timing And Ranging (NAVSTAR) missions, which substantiate the introduced aging law accounting for both the cumulated doses of particles and the different electron and hole traps in the structure.
关键词： space application,model,Degradation,gallium arsenide (GaAs) solar cell
更新于2025-09-12 10:27:22
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Effect of Gamma Irradiation on Electrical Properties of CdTe/CdS Solar Cells
摘要： The effect of Co-60 Gamma irradiation on electrical characteristics of CdTe/CdS solar cell has been analyzed using in-situ current-voltage characterization (I-V) in dark condition. The irradiation was done over a wide range of doses from 1kGy to 100 kGy. Electrical parameters such as ideality factor (n), series resistance (RS) and reverse bias leakage current (IR) for each dose have been calculated from the I-V characteristics. The ideality factor of the pristine solar cell is found to be 1.80 and it gradually increased up to 3.38 for the dose of 10 kGy, then it is around 3.38-3.61 for higher doses up to 100 kGy. The I-V characteristics showed significant increase in forward bias and drastic increase in reverse leakage current. The value of IR is 16.8 μA for pristine solar cell and it increases to 1.46 mA for 10 kGy. Further there is four times observable change in the value of IR. However the value of Rs is 0.80 ohm for pristine and continuously decreases to 0.34 ohm for 50 kGy dose. Further there is slight increase in the series resistance to 0.38 ohm for 100 kGy dose.
关键词： CdS,Radiation hardness,CdTe,Space application,Solar cells,Gamma Irradiation
更新于2025-09-12 10:27:22
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[IEEE 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Macau, Macao (2018.9.26-2018.9.28)] 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Low-power and Compact Microwave RFID Reader for Sensing Applications in Space
摘要： Radio frequency identi?cation (RFID) is the driving technology behind many compelling applications, such as internet-of-things (IoT), smart cities, and particle tracking. However, it is always challenging to make small, low-cost transponder with little power consumption. RFID tags are useful for a host of distributed sensing applications because they do not require a wired power source and use very little power to communicate wirelessly. Such tags also have great potential for use in sensing applications onboard spacecraft including spacecraft structural health monitoring and sensitive ?eld measurements. This paper proposed the design and characterization process of a low-power, compact RFID transceiver for sensing applications in space. This reader operates at the 5725-5850 MHz frequency ISM band with 31 dBm equivalent isotropically radiated power (EIRP) and -58 dBm to -82 dBm sensitivity in different conditions.
关键词： Space Application,RFID reader,Antennas
更新于2025-09-09 09:28:46