Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3340459
Keywords
antireflection coatings; copper compounds; electric admittance; gallium compounds; indium compounds; magnesium compounds; molybdenum; semiconductor growth; semiconductor-metal boundaries; solar absorber-convertors; solar cells; ternary semiconductors; vapour deposition; X-ray photoelectron spectra
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Funding
- German Federal Ministry of Economics and Technology [50 JR 0740]
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There are still open questions regarding the nature of the positive effect of the presence of Na on the performance of Cu(In,Ga)Se-2 based, chalcopyrite thin film solar cells, especially at low processing temperatures. Studying Cu(In,Ga)Se-2 thin film devices fabricated from low-temperature coevaporated absorbers on polyimide substrates by admittance and J-V-T measurements, characteristic properties are identified for different amounts of Na present during the growth. A roll-over behavior can be directly correlated with the Na-content. X-ray photoelectron spectroscopy shows the development of a MoSe2 phase at the back contact of the device. Efficiencies of 15.1% with MgF2 antireflection coating are demonstrated.
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