Fabrication and performance of a monolithic dye-sensitized TiO2/Cu(In,Ga)Se2 thin film tandem solar cell
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)Se2 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)Se2 cell by the redox mediator (I−/I3− couple) of the dye-sensitized cell and an associated voltage loss ( 140 mV) limits performance.
- URL: http://apl.aip.org
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 ; Limiting Efficiencies ; Conversion
Record created on 2009-10-12, modified on 2016-08-08