Hybrid tandem solar cells with depleted-heterojunction quantum dot and polymer bulk heterojunction subcells
Jagadamma, Lethy Krishnan
Kirmani, Ahmad R.
Adachi, Michael M.
Sargent, Edward H.
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
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AbstractWe investigate hybrid tandem solar cells that rely on the combination of solution-processed depleted-heterojunction colloidal quantum dot (CQD) and bulk heterojunction polymer:fullerene subcells. The hybrid tandem solar cell is monolithically integrated and electrically connected in series with a suitable p-n recombination layer that includes metal oxides and a conjugated polyelectrolyte. We discuss the monolithic integration of the subcells, taking into account solvent interactions with underlayers and associated constraints on the tandem architecture, and show that an adequate device configuration consists of a low bandgap CQD bottom cell and a high bandgap polymer:fullerene top cell. Once we optimize the recombination layer and individual subcells, the hybrid tandem device reaches a VOC of 1.3V, approaching the sum of the individual subcell voltages. An impressive fill factor of 70% is achieved, further confirming that the subcells are efficiently connected via an appropriate recombination layer. © 2015.
CitationKim T, Gao Y, Hu H, Yan B, Ning Z, et al. (2015) Hybrid tandem solar cells with depleted-heterojunction quantum dot and polymer bulk heterojunction subcells. Nano Energy 17: 196–205. Available: http://dx.doi.org/10.1016/j.nanoen.2015.08.010.
SponsorsKing Abdullah University of Science and Technology[KUS-11-009-21]
Ontario Research Fund Research Excellence Program
Natural Sciences and Engineering Research Council (NSERC) of Canada
KAUST Office of Competitive Research Funds