Radiation effects in ultra-thin GaAs solar cells
Radiation effects in ultra-thin GaAs solar cells
复制标题
DOI：
10.1063/5.0103381
复制
发表时间：
2022-11-14
影响因子：
3.2
通讯作者：
Hirst, L. C.
中科院分区：
文献类型：
--
作者：
Barthel, A.;Sayre, L.;Hirst, L. C.
超薄太阳能电池由于其固有的辐射耐受性而对于在空间中的使用具有重大意义，这可以允许它们在特别恶劣的辐射环境中使用，其中较厚的电池将迅速退化并且能够减小盖板玻璃厚度以减小发射质量。在这项研究中，与80 nm的GaAs吸收层的设备被照射3兆电子伏的质子。结果表明，这些超薄设备中的集成光管理提供了更高的效率，除了通过辐射弹性延长寿命。时间分辨阴极射线发光映射引入辐射引起的缺陷，增加质子注量和表征的载流子寿命从198± 5 ps预辐射到6.2± 0.6 ps，照射后2 × 10 14厘米-2注量减少。尽管在载流子寿命的大幅减少，短路电流不退化高达1 × 10 - 15 cm - 2的质子注量，超过该崩溃的短路电流观察。这种暴露与从阴极发光外推的载流子寿命变得与载流子穿过超薄器件的渡越时间相当的点相关。电流-电压行为随载流子寿命和注量的变化表明，复合统计类似于Shockley-Read-Hall单深能级陷阱模型，但双分子复合并不能完全描述所观察到的行为。这些高度耐辐射的空间电力系统的电池的影响示出提供显着的节省盖板玻璃质量，与较厚的电池相比。
Ultra-thin solar cells are of significant interest for use in space due to their intrinsic radiation tolerance, which may allow them to be used in particularly harsh radiation environments, where thicker cells would degrade rapidly and enable reduction in cover glass thickness to reduce launch mass. In this study, devices with an 80 nm GaAs absorber layer were irradiated with 3 MeV protons. It is shown that integrated light management in these ultra-thin devices offers enhanced efficiency, in addition to extended lifetime through radiation resilience. Time-resolved cathodoluminescence is employed to map the introduction of radiation-induced defects with increasing proton fluence and characterize a decrease in carrier lifetime from 198 & PLUSMN; 5 ps pre-radiation to 6.2 & PLUSMN; 0.6 ps, after irradiation to 2 x 10 14 c m - 2 fluence. Despite the substantial reduction in carrier lifetime, short-circuit current does not degrade up to a proton fluence of 1 x 10 15 cm - 2, beyond which a collapse in short-circuit current is observed. This exposure correlates with the point at which the carrier lifetime, extrapolated from cathodoluminescence, becomes comparable to the transit time for carriers to cross the ultra-thin device. Variation in current-voltage behavior with carrier lifetime and fluence shows that the recombination statistics are similar to those of a Shockley-Read-Hall single deep-level trap model, but that bimolecular recombination does not fully describe the observed behavior. An implication of these highly radiation tolerant cells for space power systems is shown to offer significant savings in cover glass mass, compared with a thicker cell.