期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 207, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2019.110355
关键词
Multijunction solar cell; Ge bottom cell; Thermal load; III-V semiconductor; V-OC
资金
- Spanish MINECO [TAILLON - TEC2015-66722-R, PCIN-2015-181-CO2-02, TEC2017-83447-P]
- Comunidad de Madrid through the project MADRID-PV2 [S2018/EMT-4308]
- Spanish Programa Estatal de Promocion del Talento y su Empleabilidad through a Ramon y Cajal grant [RYC2014-15621]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [656208]
- Marie Curie Actions (MSCA) [656208] Funding Source: Marie Curie Actions (MSCA)
This paper addresses the influence of III-V nucleation routines on Ge substrates for the growth of high efficiency multijunction solar cells. Three exemplary nucleation routines with differences in thickness and temperature were evaluated. The resulting open circuit voltage of triplejunction solar cells with these designs is significantly affected (up to 50 mV for the best optimization routine), whereas minimal differences in short circuit current are observed. Electroluminescence measurements show that both the Ge bottom cell and the Ga(In)As middle cell present a V-OC gain of 25 mV each. This result indicates that the first stages of the growth not only affect the Ge subcell itself but also to subsequent subcells. This study highlights the impact of the nucleation routine design in the performance of high efficiency multijunction solar cell based on Ge substrates.
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