Hybrid tandem solar cells with depleted-heterojunction quantum dot and polymer bulk heterojunction subcells

Taesoo Kim, Yangqin Gao, Hanlin Hu, Buyi Yan, Zhijun Ning, Lethy Krishnan Jagadamma, Kui Zhao, Ahmad R. Kirmani, Jessica Eid, Michael M. Adachi, Edward H. Sargent, Pierre Beaujuge, Aram Amassian

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We 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.
Original languageEnglish (US)
Pages (from-to)196-205
Number of pages10
JournalNano Energy
Volume17
DOIs
StatePublished - Oct 2015

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