Solution-processed perovskite-colloidal quantum dot tandem solar cells for photon collection beyond 1000 nm

Afsal Manekkathodi, Bin Chen, Junghwan Kim, Se Woong Baek, Benjamin Scheffel, Yi Hou, Olivier Ouellette, Makhsud I. Saidaminov, Oleksandr Voznyy, Vinod E. Madhavan, Abdelhak Belaidi, Sahel Ashhab, Edward Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Multi-junction solar cells based on solution-processed metal halide perovskites offer a route to increased power conversion efficiency (PCE); however, the limited options for infrared (IR)-absorbing back cells have constrained progress. Colloidal quantum dot (CQD)-based solar cells, which are solution-processed and have bandgaps tunable to wavelengths beyond 1000 nm, are attractive candidates for this role. Here we report a solution-processed four-terminal (4T) tandem solar cell comprised of a perovskite front cell and a CQD back cell. The 4T tandem provides a PCE exceeding 20%, the highest PCE reported to date for a perovskite-CQD tandem solar cell. The front semi-transparent perovskite solar cell employs a dielectric-metal-dielectric (DMD) electrode constructed from a metal film (silver/gold) sandwiched between dielectric (MoO3) layers. The highest-performing front semi-transparent perovskite solar cells exhibit a PCE of ∼18%. By tuning the wavelength-dependent transmittance of the DMD layer based on the zero-reflection condition of optical admittance, we build semi-transparent perovskite solar cells with a 25% increase in IR transmittance compared to baseline devices. The back cell is fabricated based on an IR CQD absorber layer complementary to the IR transmittance of the semi-transparent perovskite front cell. Solution-processed hybrid tandem photovoltaics (PV) combining these technologies offer to contribute to higher-efficiency solar cells for next-generation flexible photovoltaic (PV) devices.

Original languageEnglish (US)
Pages (from-to)26020-26028
Number of pages9
JournalJournal of Materials Chemistry A
Issue number45
StatePublished - 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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