Multi quantum well multijunction solar cell for space applications
Multi quantum well multijunction solar cell for space applications
复制标题
用于空间应用的多量子阱多结太阳能电池
DOI：
10.1002/pssc.200460720
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Alemu
中科院分区：
文献类型：
--
作者：
A. Freundlich;A. Alemu
通过引入InGaAs的赝晶多量子威尔斯阱（MQW）对标准InGaP-GaAs-Ge电池进行了改进，以增加限制GaAs子电池的光电流。这里所展示的方法使得多结器件能够用优化的所有子电池来制造，而不是像现在这样用故意劣化的顶部电池来制造。所提出的设备的性能建模表明，在典型的空间阳光照射下，实际效率超过35%的可能性。的电流/电压和光谱量子效率特性的GaAs量子阱太阳能电池生长的化学束外延被发现是一致的模型预测，显示出既增加了电池的工作波长范围和一个上级电流输出。预计该装置在辐射剂量相当于在地球静止轨道上运行10年的情况下（1 MeV电子辐射通量超过1015 cm-2），能够实现约30%的寿命终了效率。所提出的装置的预计辐射耐受性大大超过现有的常规空间太阳能电池技术，使其特别适合用于长时间的空间任务。（© 2005 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
Standard InGaP-GaAs-Ge cell is modified by incorporating pseudomorphic multi-quantum wells (MQW) of InGaAs to increase the photocurrent of the limiting GaAs subcell. The approach as demonstrated here enables the multijunction device to be made with all sub-cells optimized, rather than with a deliberately degraded top cell, as is now the case. A modelling of the performance of the proposed device indicates possibilities for achieving practical efficiencies in excess of 35 percent under typical space sunlight illumination. The current/voltage and spectral quantum efficiency characteristics of GaAs MQW solar cells grown by chemical beam epitaxy are found to be consistent with model predictions, showing both an increase of the cell operating wavelength range and a superior current output. The device is predicted as being capable to achieve end of life efficiency of about 30 percent at radiation doses equivalent of 10 years operation in Geo-stationary orbits (1 MeV electron radiation fluences in excess of 1015cm–2). The projected radiation tolerance of the proposed device exceed significantly those of the existing conventional space solar cell technologies, making it particularly suitable for use in long duration space missions. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)