Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3125432
Keywords
chalcogenide glasses; copper compounds; corrosion; dyes; gallium compounds; indium compounds; optical constants; oxidation; reduction (chemical); semiconductor thin films; solar cells; thin film devices; titanium compounds
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Funding
- CCEM-CH
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Tandem solar cells using different bandgap absorbers allow efficient photovoltaic conversion in a wide range of the solar spectrum. The optical gaps of the dye-sensitized solar cell and the Cu(In,Ga)Se-2 solar cell are ideal for application in double-junction devices and a mechanically stacked device has been reported recently. We report on the monolithic integration of these subcells to cut optical losses at needless interfaces and material costs, achieving 12.2% conversion efficiency at full sunlight. The high open-circuit voltage confirms the series connection, but corrosion of the Cu(In,Ga)Se-2 cell by the redox mediator (I-/I-3(-) couple) of the dye-sensitized cell and an associated voltage loss (approximate to 140 mV) limits performance.
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