期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 124, 期 -, 页码 150-158出版社
ELSEVIER
DOI: 10.1016/j.solmat.2014.01.044
关键词
Plasma-assisted molecular beam epitaxy; Multi-junction solar cells; Dilute nitrides; GaInNAs; Concentrated photovoltaics
资金
- Finnish Funding Agency for Technology and Innovation-TEKES [40120/09 Solar III-V]
- County Administrative Board of Oulu for ENNA Project [S11249]
- National Graduate School in Material Physics
- Graduate School in Electronics, Telecommunication and Automation
- Ulla Tuominen Foundation
- Finnish Foundation for Technology Promotion
- Emil Aaltonen Foundation
- Wartsila Foundation
We have investigated the role of the nitrogen content, the growth parameters, and the annealing processes involved in molecular beam epitaxy of GaInNAs solar cells lattice-matched to GaAs. The nitrogen composition was varied between 1% and 5%. The influence of the growth temperature was assessed by performing photoluminescence, atomic force microscopy, X-ray diffraction, reflection high-energy electron diffraction, quantum efficiency and light-biased current-voltage measurements. The growth temperature ensuring the best cell parameters was found to be 440 degrees C. At this temperature we were able to incorporate up to 4% of nitrogen and achieve a good material quality. Further increase of the N composition to 5% led to phase separation. For the lattice matched samples grown within the optimal temperature range, we have identified a clear (1 x 3) surface reconstruction. Using the optimized growth we have demonstrated a GaInNAs p-i-n solar cell structure containing 4% nitrogen, that exhibited a short-circuit current density as high as 33.8 mA/cm(2) in respect to effective area illuminated. These measurements have been performed under real sun AM1.5 (similar to 1000 W/m(2)) illumination. (c) 2014 Elsevier B.V. All rights reserved.
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