TiO2 and down-conversion phosphors to enhance UV protection of solar cells

被引:2
作者
Voarino, Philippe [1 ]
Berthomieu, Thomas [2 ]
Jamin, Clement [1 ]
Barros, Anthony [2 ]
Therias, Sandrine [2 ]
Boyer, Damien [2 ]
Ibarrart, Loris [3 ]
机构
[1] Univ Grenoble Alpes, CEA, Liten, Campus INES, F-73375 Le Bourget du La, France
[2] Univ Clermont Auvergne, CNRS, Clermont Auvergne INP, ICCF, F-63000 Clermont Auvergne, France
[3] CNES Ctr Ctr Natl Etud Spatiales, F-31401 Toulouse, France
关键词
Ultraviolet; Space; Photovoltaics; Down-conversion; TiO2;
D O I
10.1016/j.solmat.2024.113261
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In recent years, demand for solar generators for LEO (Low Earth Orbit) applications has been growing, and much research has focused on the use of less expensive and thinner (<90 mu m). silicon-based solar cells that can be integrated on flexible Photovoltaic Assemblies (PVAs). These solar cells must be protected from space UV radiations and also withstand more than 50,000 thermal cycles in LEO. The solution advocated here involves the incorporation of UV-absorbing particles into a spatial polymer, combined with lanthanide ions based inorganic phosphors (Y2O3:Eu3+ and Y2O2S:Eu3+) to achieve the down-conversion process. Embedded into a silicone-based polymer matrix with a thickness close to 100 mu m, these particles are then deposited on 180 mu m thick Ga-doped heterojunction silicon cells (30x30 mm(2)). UV tests are carried out on ONERA's SEMIRAMIS platform at two doses: 425 esh and 1005 esh. A series of 1000 thermal cycles is carried out at the CEA. The first spatial UV analysis revealed a maximum loss of almost 5 % in short-circuit current (Isc) for PV devices after 1005 esh. Comparing results in open circuit voltage (Voc), the bare cell degrades as the dose increases (-2 % at 425 esh and -5 % at 1005 esh). One positive point is that the addition of TiO2 particles protects the solar cell. These initial results point out that it is possible to produce a protective coating to limit the effects of degradation of Silicon cells under space UV flux, with a focus on producing flexible PVAs.
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页数:9
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